Java | 27天成为Java大神

by DuGuQiuBai Java Version: Current License: Artistic-2.0

Download this library from

kandi X-RAY | Java Summary

Java is a Java library. Java has no vulnerabilities, it has a Weak Copyleft License and it has medium support. However Java has 175 bugs and it build file is not available. You can download it from GitHub.

27天成为Java大神

Support

Quality

Security

License

Reuse

kandi-support Support

Java has a medium active ecosystem.
It has 8379 star(s) with 3945 fork(s). There are 728 watchers for this library.
It had no major release in the last 12 months.
There are 29 open issues and 9 have been closed. On average issues are closed in 9 days. There are 14 open pull requests and 0 closed requests.
It has a neutral sentiment in the developer community.
The latest version of Java is current.

Java Support

Best in #Java

Average in #Java

Java Support

Best in #Java

Average in #Java

quality kandi Quality

Java has 175 bugs (117 blocker, 11 critical, 40 major, 7 minor) and 3379 code smells.

Java Quality

Best in #Java

Average in #Java

Java Quality

Best in #Java

Average in #Java

security Security

Java has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
Java code analysis shows 0 unresolved vulnerabilities.
There are 80 security hotspots that need review.

Java Security

Best in #Java

Average in #Java

Java Security

Best in #Java

Average in #Java

license License

Java is licensed under the Artistic-2.0 License. This license is Weak Copyleft.
Weak Copyleft licenses have some restrictions, but you can use them in commercial projects.

Java License

Best in #Java

Average in #Java

Java License

Best in #Java

Average in #Java

build Reuse

Java releases are not available. You will need to build from source code and install.
Java has no build file. You will be need to create the build yourself to build the component from source.
Java saves you 8377 person hours of effort in developing the same functionality from scratch.
It has 17204 lines of code, 1418 functions and 604 files.
It has low code complexity. Code complexity directly impacts maintainability of the code.

Java Reuse

Best in #Java

Average in #Java

Java Reuse

Best in #Java

Average in #Java

Top functions reviewed by kandi - BETA

kandi has reviewed Java and discovered the below as its top functions. This is intended to give you an instant insight into Java implemented functionality, and help decide if they suit your requirements.

Initialize the components .
JiSuanButtonMouseClicked event .
The guess button action for the guess button .
Called when login button is pressed .
generate two threads
Check if the file is login
Sets the center of the JFrame .
Prints out System . out
Close client socket .
Center the screen .

Java Key Features

27天成为Java大神

Java Examples and Code Snippets

See all related Code Snippets

Passing and retrieving MutableList or ArrayList from Activity A to B

Copy

Download

// Packing and sending the data:
val i = Intent(context, GalleryShow::class.java)
i.putExtra("list", ArrayList(memes)) // where memes is your MutableList<Meme> property
startActivityForResult(i, 777)

// Unpacking the data in the other activity:
memes = intent.extras?.get("list") as MutableList<Meme>

How to write Javascript recipe.components.sort((a, b) => (a.components ? 1 : 0) - (b.components ? 1 : 0)) in Python?

Copy

Download

components.sort((a, b) => (a ? 1 : 0) - (b ? 1 : 0))

components.sort(key=bool)

components.sort((a, b) => (a.components ? 1 : 0) - (b.components ? 1 : 0))

components.sort(key=lambda a: bool(a.components))

-----------------------

components.sort((a, b) => (a ? 1 : 0) - (b ? 1 : 0))

components.sort(key=bool)

components.sort((a, b) => (a.components ? 1 : 0) - (b.components ? 1 : 0))

components.sort(key=lambda a: bool(a.components))

-----------------------

components.sort((a, b) => (a ? 1 : 0) - (b ? 1 : 0))

components.sort(key=bool)

components.sort((a, b) => (a.components ? 1 : 0) - (b.components ? 1 : 0))

components.sort(key=lambda a: bool(a.components))

-----------------------

components.sort((a, b) => (a ? 1 : 0) - (b ? 1 : 0))

components.sort(key=bool)

components.sort((a, b) => (a.components ? 1 : 0) - (b.components ? 1 : 0))

components.sort(key=lambda a: bool(a.components))

Create a DateTimeFormater with an Optional Section at Beginning

Copy

Download

.appendValue(TimecodeHour.HOUR, 3, 4, SignStyle.NEVER)

-----------------------

var formatter = new DateTimeFormatterBuilder()
    .optionalStart()
      .appendValue(HOUR_OF_DAY, 2, 4, SignStyle.NEVER).appendLiteral(":")
      .appendValue(MINUTE_OF_HOUR, 2).appendLiteral(":")
      .appendValue(SECOND_OF_MINUTE, 2)
    .optionalEnd()
    .optionalStart()
      .parseDefaulting(HOUR_OF_DAY, 0)
      .appendValue(MINUTE_OF_HOUR, 2).appendLiteral(":")
      .appendValue(SECOND_OF_MINUTE, 2)
    .optionalEnd()
    .toFormatter(Locale.ENGLISH);

-----------------------

public static Duration parse(String timeCodeString) {
    String iso8601 = timeCodeString
            .replaceFirst("^(\\d{2,}):(\\d{2}):(\\d{2}\\.\\d{3})$", "PT$1H$2M$3S")
            .replaceFirst("^(\\d{2}):(\\d{2}\\.\\d{3})$", "PT$1M$2S");
    return Duration.parse(iso8601);
}

    System.out.println(parse("20:33.123"));
    System.out.println(parse("123:20:33.123"));

PT20M33.123S
PT123H20M33.123S

-----------------------

public static Duration parse(String timeCodeString) {
    String iso8601 = timeCodeString
            .replaceFirst("^(\\d{2,}):(\\d{2}):(\\d{2}\\.\\d{3})$", "PT$1H$2M$3S")
            .replaceFirst("^(\\d{2}):(\\d{2}\\.\\d{3})$", "PT$1M$2S");
    return Duration.parse(iso8601);
}

    System.out.println(parse("20:33.123"));
    System.out.println(parse("123:20:33.123"));

PT20M33.123S
PT123H20M33.123S

-----------------------

public static Duration parse(String timeCodeString) {
    String iso8601 = timeCodeString
            .replaceFirst("^(\\d{2,}):(\\d{2}):(\\d{2}\\.\\d{3})$", "PT$1H$2M$3S")
            .replaceFirst("^(\\d{2}):(\\d{2}\\.\\d{3})$", "PT$1M$2S");
    return Duration.parse(iso8601);
}

    System.out.println(parse("20:33.123"));
    System.out.println(parse("123:20:33.123"));

PT20M33.123S
PT123H20M33.123S

How to use a SHA256 MessageDigest in Java on Linux

Copy

Download

MessageDigest.getInstance("SHA-256");

Set<String> messageDigest = Security.getAlgorithms("MessageDigest");
messageDigest.forEach(System.out::println);

-----------------------

MessageDigest.getInstance("SHA-256");

Set<String> messageDigest = Security.getAlgorithms("MessageDigest");
messageDigest.forEach(System.out::println);

Regex Pattern In Between Two Exact Strings

Copy

Download

\\bFOLDER/[a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{12}\\.txt\\b

How to required Date and time using Java?

Copy

Download

import java.time.LocalDateTime;
import java.time.Period;
import java.time.ZoneId;
import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;

public class DateTest {
    public static List<ZonedDateTime> getDaysBetweenDates(ZonedDateTime startDate, ZonedDateTime endDate, int interval) {
        List<ZonedDateTime> dates = new ArrayList<>();
        while (!startDate.isAfter(endDate)) {
            dates.add(startDate);
            if (Period.between(startDate.toLocalDate(), endDate.toLocalDate()).getDays() < interval) {
                startDate = endDate;
            }
            else {
                startDate = startDate.plusDays(interval);
            }
            dates.add(startDate);
            startDate = startDate.plusDays(1);
        }
        return dates;
    }

    public static void main(String[] args) {
        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("dd/MM/yyyy HH:mm:ss", Locale.ENGLISH);
        List<ZonedDateTime> dates = getDaysBetweenDates(ZonedDateTime.of(LocalDateTime.parse("05/08/2021 00:00:00", formatter), ZoneId.systemDefault()),
                                                        ZonedDateTime.of(LocalDateTime.parse("15/08/2021 23:59:59", formatter), ZoneId.systemDefault()),
                                                        5);
        for (int i = 0; i < dates.size(); i+=2) {
            System.out.printf("%s to %s , ",
                              dates.get(i).format(formatter),
                              dates.get(i + 1).format(formatter));
        }
    }
}

05/08/2021 00:00:00 to 10/08/2021 00:00:00 , 11/08/2021 00:00:00 to 15/08/2021 23:59:59 ,

-----------------------

import java.time.LocalDateTime;
import java.time.Period;
import java.time.ZoneId;
import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;

public class DateTest {
    public static List<ZonedDateTime> getDaysBetweenDates(ZonedDateTime startDate, ZonedDateTime endDate, int interval) {
        List<ZonedDateTime> dates = new ArrayList<>();
        while (!startDate.isAfter(endDate)) {
            dates.add(startDate);
            if (Period.between(startDate.toLocalDate(), endDate.toLocalDate()).getDays() < interval) {
                startDate = endDate;
            }
            else {
                startDate = startDate.plusDays(interval);
            }
            dates.add(startDate);
            startDate = startDate.plusDays(1);
        }
        return dates;
    }

    public static void main(String[] args) {
        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("dd/MM/yyyy HH:mm:ss", Locale.ENGLISH);
        List<ZonedDateTime> dates = getDaysBetweenDates(ZonedDateTime.of(LocalDateTime.parse("05/08/2021 00:00:00", formatter), ZoneId.systemDefault()),
                                                        ZonedDateTime.of(LocalDateTime.parse("15/08/2021 23:59:59", formatter), ZoneId.systemDefault()),
                                                        5);
        for (int i = 0; i < dates.size(); i+=2) {
            System.out.printf("%s to %s , ",
                              dates.get(i).format(formatter),
                              dates.get(i + 1).format(formatter));
        }
    }
}

05/08/2021 00:00:00 to 10/08/2021 00:00:00 , 11/08/2021 00:00:00 to 15/08/2021 23:59:59 ,

-----------------------

public static void printDaysInPeriod(LocalDate start, LocalDate end, int interval) {
    // provide some data structure that 
    Map<LocalDate, LocalDate> intervals = new TreeMap<LocalDate, LocalDate>();
    // loop through the dates in the defined period
    while (start.isBefore(end)) {
        // use the interval as step
        LocalDate intervalEnd = start.plusDays(interval);
        // store the sub-interval in the data structure
        intervals.put(start, intervalEnd);
        // and rearrange "start" to be the day after the last sub-interval
        start = intervalEnd.plusDays(1);
    }
    // provide a formatter that produces the desired output per datetime
    DateTimeFormatter formatter = DateTimeFormatter.ofPattern(
                                      "dd/MM/uuuu HH:mm:ss"
                                  );
    // provide a data structure for the output parts (Strings here)
    List<String> intervalOutput = new ArrayList<>();
    // stream the sub-intervals
    intervals.entrySet().forEach(e ->
        // then produce the desired output per sub-interval and store it
        intervalOutput.add(e.getKey().atStartOfDay()
                                     .format(formatter)
                            + " to "
                            + e.getValue()
                               .atTime(LocalTime.MAX)
                               .format(formatter)));
    // finally output the sub-interval Strings comma-separated
    System.out.println(String.join(" , ", intervalOutput));
}

public static void main(String[] args) {
    // example dates defining an interval
    String startInterval = "05/08/2021";
    String endInterval = "15/08/2021";
    // provide a parser that handles the format
    DateTimeFormatter dateParser = DateTimeFormatter.ofPattern("dd/MM/uuuu");
    // then parse the dates to LocalDates
    LocalDate start = LocalDate.parse(startInterval, dateParser);
    LocalDate end = LocalDate.parse(endInterval, dateParser);
    // and use the method
    printDaysInPeriod(start, end, 5);
}

05/08/2021 00:00:00 to 10/08/2021 23:59:59 , 11/08/2021 00:00:00 to 16/08/2021 23:59:59

-----------------------

public static void printDaysInPeriod(LocalDate start, LocalDate end, int interval) {
    // provide some data structure that 
    Map<LocalDate, LocalDate> intervals = new TreeMap<LocalDate, LocalDate>();
    // loop through the dates in the defined period
    while (start.isBefore(end)) {
        // use the interval as step
        LocalDate intervalEnd = start.plusDays(interval);
        // store the sub-interval in the data structure
        intervals.put(start, intervalEnd);
        // and rearrange "start" to be the day after the last sub-interval
        start = intervalEnd.plusDays(1);
    }
    // provide a formatter that produces the desired output per datetime
    DateTimeFormatter formatter = DateTimeFormatter.ofPattern(
                                      "dd/MM/uuuu HH:mm:ss"
                                  );
    // provide a data structure for the output parts (Strings here)
    List<String> intervalOutput = new ArrayList<>();
    // stream the sub-intervals
    intervals.entrySet().forEach(e ->
        // then produce the desired output per sub-interval and store it
        intervalOutput.add(e.getKey().atStartOfDay()
                                     .format(formatter)
                            + " to "
                            + e.getValue()
                               .atTime(LocalTime.MAX)
                               .format(formatter)));
    // finally output the sub-interval Strings comma-separated
    System.out.println(String.join(" , ", intervalOutput));
}

public static void main(String[] args) {
    // example dates defining an interval
    String startInterval = "05/08/2021";
    String endInterval = "15/08/2021";
    // provide a parser that handles the format
    DateTimeFormatter dateParser = DateTimeFormatter.ofPattern("dd/MM/uuuu");
    // then parse the dates to LocalDates
    LocalDate start = LocalDate.parse(startInterval, dateParser);
    LocalDate end = LocalDate.parse(endInterval, dateParser);
    // and use the method
    printDaysInPeriod(start, end, 5);
}

05/08/2021 00:00:00 to 10/08/2021 23:59:59 , 11/08/2021 00:00:00 to 16/08/2021 23:59:59

-----------------------

public static void printDaysInPeriod(LocalDate start, LocalDate end, int interval) {
    // provide some data structure that 
    Map<LocalDate, LocalDate> intervals = new TreeMap<LocalDate, LocalDate>();
    // loop through the dates in the defined period
    while (start.isBefore(end)) {
        // use the interval as step
        LocalDate intervalEnd = start.plusDays(interval);
        // store the sub-interval in the data structure
        intervals.put(start, intervalEnd);
        // and rearrange "start" to be the day after the last sub-interval
        start = intervalEnd.plusDays(1);
    }
    // provide a formatter that produces the desired output per datetime
    DateTimeFormatter formatter = DateTimeFormatter.ofPattern(
                                      "dd/MM/uuuu HH:mm:ss"
                                  );
    // provide a data structure for the output parts (Strings here)
    List<String> intervalOutput = new ArrayList<>();
    // stream the sub-intervals
    intervals.entrySet().forEach(e ->
        // then produce the desired output per sub-interval and store it
        intervalOutput.add(e.getKey().atStartOfDay()
                                     .format(formatter)
                            + " to "
                            + e.getValue()
                               .atTime(LocalTime.MAX)
                               .format(formatter)));
    // finally output the sub-interval Strings comma-separated
    System.out.println(String.join(" , ", intervalOutput));
}

public static void main(String[] args) {
    // example dates defining an interval
    String startInterval = "05/08/2021";
    String endInterval = "15/08/2021";
    // provide a parser that handles the format
    DateTimeFormatter dateParser = DateTimeFormatter.ofPattern("dd/MM/uuuu");
    // then parse the dates to LocalDates
    LocalDate start = LocalDate.parse(startInterval, dateParser);
    LocalDate end = LocalDate.parse(endInterval, dateParser);
    // and use the method
    printDaysInPeriod(start, end, 5);
}

05/08/2021 00:00:00 to 10/08/2021 23:59:59 , 11/08/2021 00:00:00 to 16/08/2021 23:59:59

-----------------------

import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.Locale;

public class Main {
    public static void main(String[] args) {
        String strStartDateTime = "1/08/2021 00:00:00";
        String strEndDateTime = "20/08/2021 23:59:59";
        DateTimeFormatter dtfInput = DateTimeFormatter.ofPattern("d/M/u H:m:s", Locale.ENGLISH);

        LocalDateTime startDateTime = LocalDateTime.parse(strStartDateTime, dtfInput);
        LocalDateTime endDateTime = LocalDateTime.parse(strEndDateTime, dtfInput);

        DateTimeFormatter dtfOutput = DateTimeFormatter.ofPattern("uuuu-MM-dd HH:mm:ss", Locale.ENGLISH);
        for (LocalDateTime ldt = startDateTime, nextDateTime = ldt.plusDays(10).minusSeconds(1); !ldt
                .isAfter(endDateTime); ldt = ldt.plusDays(10), nextDateTime = ldt.plusDays(10).minusSeconds(1))
            System.out.println(dtfOutput.format(ldt) + " - " + nextDateTime);
    }
}

2021-08-01 00:00:00 - 2021-08-10T23:59:59
2021-08-11 00:00:00 - 2021-08-20T23:59:59

-----------------------

import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.Locale;

public class Main {
    public static void main(String[] args) {
        String strStartDateTime = "1/08/2021 00:00:00";
        String strEndDateTime = "20/08/2021 23:59:59";
        DateTimeFormatter dtfInput = DateTimeFormatter.ofPattern("d/M/u H:m:s", Locale.ENGLISH);

        LocalDateTime startDateTime = LocalDateTime.parse(strStartDateTime, dtfInput);
        LocalDateTime endDateTime = LocalDateTime.parse(strEndDateTime, dtfInput);

        DateTimeFormatter dtfOutput = DateTimeFormatter.ofPattern("uuuu-MM-dd HH:mm:ss", Locale.ENGLISH);
        for (LocalDateTime ldt = startDateTime, nextDateTime = ldt.plusDays(10).minusSeconds(1); !ldt
                .isAfter(endDateTime); ldt = ldt.plusDays(10), nextDateTime = ldt.plusDays(10).minusSeconds(1))
            System.out.println(dtfOutput.format(ldt) + " - " + nextDateTime);
    }
}

2021-08-01 00:00:00 - 2021-08-10T23:59:59
2021-08-11 00:00:00 - 2021-08-20T23:59:59

While loop doesn't exit after file download

Copy

Download

// upload side
void upload() {
  Path p = Paths.get("/path/to/file/you/want/to/send");
  long fileSize = Files.size(p);
  out.write(longToBytes(fileSize);
  try (InputStream in = Files.newInputStream(p)) {
    in.transferTo(out);
  }
}

public static byte[] longToBytes(long x) {
    ByteBuffer buffer = ByteBuffer.allocate(Long.BYTES);
    buffer.putLong(x);
    return buffer.array();
}

void download() {
  long size = bytesToLong(in.readNBytes(8));
  Path p = Paths.get("/file/to/store/data/at");
  // Generally network transfer sizes are a bit higher than 1k;
  // up to 64k in fact. Best to declare a larger buffer!
  byte[] bb = new byte[65536];
  try (OutputStream out = Files.newOutputStream(p)) {
    while (size > 0) {
      int count = in.read(bb);
      if (count == -1) throw new IOException("Unexpected end of stream");
      out.write(bb, 0, count);
      size -= count;
    }
  }
}

public static long bytesToLong(byte[] bytes) {
    ByteBuffer buffer = ByteBuffer.allocate(Long.BYTES);
    buffer.put(bytes);
    buffer.flip();//need flip 
    return buffer.getLong();
}

-----------------------

// upload side
void upload() {
  Path p = Paths.get("/path/to/file/you/want/to/send");
  long fileSize = Files.size(p);
  out.write(longToBytes(fileSize);
  try (InputStream in = Files.newInputStream(p)) {
    in.transferTo(out);
  }
}

public static byte[] longToBytes(long x) {
    ByteBuffer buffer = ByteBuffer.allocate(Long.BYTES);
    buffer.putLong(x);
    return buffer.array();
}

void download() {
  long size = bytesToLong(in.readNBytes(8));
  Path p = Paths.get("/file/to/store/data/at");
  // Generally network transfer sizes are a bit higher than 1k;
  // up to 64k in fact. Best to declare a larger buffer!
  byte[] bb = new byte[65536];
  try (OutputStream out = Files.newOutputStream(p)) {
    while (size > 0) {
      int count = in.read(bb);
      if (count == -1) throw new IOException("Unexpected end of stream");
      out.write(bb, 0, count);
      size -= count;
    }
  }
}

public static long bytesToLong(byte[] bytes) {
    ByteBuffer buffer = ByteBuffer.allocate(Long.BYTES);
    buffer.put(bytes);
    buffer.flip();//need flip 
    return buffer.getLong();
}

-----------------------

        try (OutputStream out = new FileOutputStream(path)) {
            final InputStream is = socket.getInputStream();
            byte[] bytes = new byte[1024];
            int count;
            long receivedBytes = 0;
            while (receivedBytes < byteSize && (count = is.read(bytes)) > 0) {
               // if ((count = is.read(bytes)) <= 0) break;
                out.write(bytes, 0, count);
                receivedBytes = receivedBytes + count;
                //System.out.println(count + "   " + receivedBytes + "/" + byteSize);
            }
        }

Micronaut java httpclient creation with the existing server

Copy

Download

@Singleton 
public class MyClient {

    private final RxHttpClient client;

    public MyClient(@Client("https://some.third-party.com") RxHttpClient client) {  
        this.client = client;
    }

    HttpResponse<String> getSomething(Integer id) {
        URI uri = UriBuilder.of("/some-objects").path(id).build();
        return client.toBlocking().exchange(HttpRequest.GET(uri), String.class);
    }
}

@Client("some-service")
public interface SomeServiceClient {

    @Get("/api/some-objects/{id}")
    String getSomeObject(@QueryValue("id") id: Integer);
}

micronaut:
  http:
    services:
      some-service:
        url: "https://some.third-party.com"
        read-timeout: 1m

@Singleton 
public class SomeServiceConsumer {

    private final SomeServiceClient client;

    public SomeServiceConsumer(SomeServiceClient client) {  
        this.client = client;
    }

    void doWithSomething(Integer id) {
        String object = client.getSomeObject(id);
        ... // processing of object here
    }
}

-----------------------

@Singleton 
public class MyClient {

    private final RxHttpClient client;

    public MyClient(@Client("https://some.third-party.com") RxHttpClient client) {  
        this.client = client;
    }

    HttpResponse<String> getSomething(Integer id) {
        URI uri = UriBuilder.of("/some-objects").path(id).build();
        return client.toBlocking().exchange(HttpRequest.GET(uri), String.class);
    }
}

@Client("some-service")
public interface SomeServiceClient {

    @Get("/api/some-objects/{id}")
    String getSomeObject(@QueryValue("id") id: Integer);
}

micronaut:
  http:
    services:
      some-service:
        url: "https://some.third-party.com"
        read-timeout: 1m

@Singleton 
public class SomeServiceConsumer {

    private final SomeServiceClient client;

    public SomeServiceConsumer(SomeServiceClient client) {  
        this.client = client;
    }

    void doWithSomething(Integer id) {
        String object = client.getSomeObject(id);
        ... // processing of object here
    }
}

-----------------------

@Singleton 
public class MyClient {

    private final RxHttpClient client;

    public MyClient(@Client("https://some.third-party.com") RxHttpClient client) {  
        this.client = client;
    }

    HttpResponse<String> getSomething(Integer id) {
        URI uri = UriBuilder.of("/some-objects").path(id).build();
        return client.toBlocking().exchange(HttpRequest.GET(uri), String.class);
    }
}

@Client("some-service")
public interface SomeServiceClient {

    @Get("/api/some-objects/{id}")
    String getSomeObject(@QueryValue("id") id: Integer);
}

micronaut:
  http:
    services:
      some-service:
        url: "https://some.third-party.com"
        read-timeout: 1m

@Singleton 
public class SomeServiceConsumer {

    private final SomeServiceClient client;

    public SomeServiceConsumer(SomeServiceClient client) {  
        this.client = client;
    }

    void doWithSomething(Integer id) {
        String object = client.getSomeObject(id);
        ... // processing of object here
    }
}

-----------------------

@Singleton 
public class MyClient {

    private final RxHttpClient client;

    public MyClient(@Client("https://some.third-party.com") RxHttpClient client) {  
        this.client = client;
    }

    HttpResponse<String> getSomething(Integer id) {
        URI uri = UriBuilder.of("/some-objects").path(id).build();
        return client.toBlocking().exchange(HttpRequest.GET(uri), String.class);
    }
}

@Client("some-service")
public interface SomeServiceClient {

    @Get("/api/some-objects/{id}")
    String getSomeObject(@QueryValue("id") id: Integer);
}

micronaut:
  http:
    services:
      some-service:
        url: "https://some.third-party.com"
        read-timeout: 1m

@Singleton 
public class SomeServiceConsumer {

    private final SomeServiceClient client;

    public SomeServiceConsumer(SomeServiceClient client) {  
        this.client = client;
    }

    void doWithSomething(Integer id) {
        String object = client.getSomeObject(id);
        ... // processing of object here
    }
}

How do I use a Transaction in a Reactive Flow in Spring Integration?

Copy

Download

/**
 * Populate a {@link FluxMessageChannel} to start a reactive processing for upstream data,
 * wrap it to a {@link Flux}, apply provided {@link Function} via {@link Flux#transform(Function)}
 * and emit the result to one more {@link FluxMessageChannel}, subscribed in the downstream flow.
 * @param fluxFunction the {@link Function} to process data reactive manner.
 * @param <I> the input payload type.
 * @param <O> the output type.
 * @return the current {@link BaseIntegrationFlowDefinition}.
 */
@SuppressWarnings(UNCHECKED)
public <I, O> B fluxTransform(Function<? super Flux<Message<I>>, ? extends Publisher<O>> fluxFunction) {

Swing JMenuBar not rendering properly

Copy

Download

import java.util.*;
import javax.swing.*;

public class App implements Runnable {
    private static final long serialVersionUID = 6924949643971067836L;

    private static final Character[] VALID_CHARS = {'!', '$', '%', '^', '&', '*', '(', ')', '-', '_', '=', '+'};
    private static final Character[] LOWER_ALPHA = {'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'};
    private static final Character[] UPPER_ALPHA = {'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'};
    private static final Character[] VALID_NUMS = {'1', '2', '3', '4', '5', '6', '7', '8', '9', '0'};
    private static final String[] KEYBOARD_COMBOS = {"qwe", "wer", "ert", "rty", "tyu", "yui", "uio", "iop", "asd", "sdf", "dfg", "fgh", "gjh", "hjk", "jkl", "zxc", "xcv", "cvb", "vbn", "bnm"};
    
    private Scanner scanner;
    private String password;
    private Integer score;
    private List<Character> pass;
    private JFrame parent;
    private JLabel frameScore;

    private boolean num = false;
    private boolean upper = false;
    private boolean lower = false;
    private boolean character = false;
    
    public App() { }
    
    private void checkPassword() {
        System.out.println("Checking password...");
    }

    private void generatePassword() {
        System.out.println("Generating password...");
    }
    
    private void why() {
        System.out.println("Why...");
    }
    
    protected JPanel createContent() {
        JPanel mainPanel = new JPanel();
        JButton check = new JButton("Check Password");
        JButton generate = new JButton("Generate Password");
        
        check.addActionListener(e -> this.checkPassword());
        generate.addActionListener(e -> this.generatePassword());
        
        check.setBounds(500,500, 170, 50);
        generate.setBounds(500, 200, 170, 50);
        
        mainPanel.add(check);
        mainPanel.add(generate);
        
        return mainPanel;
    }
    
    protected JMenuBar createMenu() {
        JMenuBar menuBar = new JMenuBar();
        JMenu checkPass = new JMenu("Check Password");
        JMenu resetPass = new JMenu("Generate Password");
        JMenu extraCodes = new JMenu("Extra Codes");
        
        JMenuItem enterPass = new JMenuItem("Enter password >>>");
        JMenuItem generatePass = new JMenuItem("Generate >>>");
        JMenuItem verify = new JMenuItem("Valid >>>");
        JMenuItem about = new JMenuItem("Why >>>");
        
        enterPass.addActionListener(e -> this.checkPassword());
        generatePass.addActionListener(e -> this.generatePassword());
        verify.addActionListener(e -> JOptionPane.showMessageDialog(this.parent, Arrays.asList(VALID_CHARS).toString(), "Valid Characters", JOptionPane.PLAIN_MESSAGE));
        about.addActionListener(e -> this.why());
        
        menuBar.add(checkPass);
        menuBar.add(resetPass);
        menuBar.add(extraCodes);
        
        checkPass.add(enterPass);
        resetPass.add(generatePass);
        extraCodes.add(verify);
        extraCodes.add(about);
        
        return menuBar;
    }
    
    @Override
    public void run() {
        this.parent = new JFrame();
        
        this.parent.setJMenuBar(createMenu());
        this.parent.setContentPane(createContent());
        this.parent.pack();
        this.parent.setLocationRelativeTo(null);
        this.parent.setVisible(true);
    }
    
    public static void main(String[] args) {
        try {
            SwingUtilities.invokeAndWait(new App());
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

See all related Code Snippets

Community Discussions

Trending Discussions on Java

maven multi-module project with two versions of protobuf
Read file.txt and split (:)
Passing and retrieving MutableList or ArrayList from Activity A to B
How to write Javascript recipe.components.sort((a, b) => (a.components ? 1 : 0) - (b.components ? 1 : 0)) in Python?
Create a DateTimeFormater with an Optional Section at Beginning
How to use a SHA256 MessageDigest in Java on Linux
Regex Pattern In Between Two Exact Strings
How to required Date and time using Java?
While loop doesn't exit after file download
Micronaut java httpclient creation with the existing server

Trending Discussions on Java

QUESTION

maven multi-module project with two versions of protobuf

Asked 2021-Jun-15 at 21:40

We have a multi-module maven project. One of the modules has a bunch of .proto files, which we compile to java files. Pretty much every other module depends on this module. Most of them use Protobuf 2.4, but one needs to use 2.5.

Is there any nice way to do this? (The not nice way is to edit the pom file to say "2.5", build a jar, manually copy that jar to wherever we need it, and then change the pom file back to 2.4.)

ANSWER

Answered 2021-Jun-08 at 13:59

Never used protobuf, but, as I understand it's a plugin that generate stuff.

So I'm gonna give you generic pointer hoping it will help. I think you should either try to make 2 jar with different classifier from a single module, see https://maven.apache.org/plugins/maven-jar-plugin/examples/attached-jar.html For example classifier proto2.4 and proto2.5 then you can add the classifier when you define the dependency to that module.

Other option I see is having 2 modules, the real one, you have now, and another one for 2.5 Generate a zip from the main one and the second module would be empty but have a dependency on the generated zip, unzip it and then compile with the plugin config for 2.5 Slower at execution, a bit dirtier imho, but can be needed if for example you need more customization than just the version.

Source https://stackoverflow.com/questions/67879893

QUESTION

Passing and retrieving MutableList or ArrayList from Activity A to B

Asked 2021-Jun-15 at 20:06

I need to pass this:

private lateinit var memes: MutableList<Memes>

which has this model:

class Memes (
    @SerializedName("id") var id: Long,
    @SerializedName("title") var title: String
)

from activity a to b.

I've altready seen couple "solutions" and none of them works!

This is the last that I've tried:

    val extras = Bundle()
    val memesArrayList = ArrayList(memes)
    val i = Intent(context, GalleryShow::class.java)
    i.putExtras(extras)
    i.putStringArrayListExtra("list", memesArrayList)
    (context as Activity).startActivityForResult(i, 777)

However, I get Type mismatch: inferred type is ArrayList<Memes!> but ArrayList<String!>? was expected on memesArrayList.

EDIT:

This is my latest attempt now:

In activity A inside recyclerview item:

val extras = Bundle()

extras.putString("gal", "animals")
extras.putString("query", "")

val i = Intent(context, GalleryShow::class.java)
i.putExtra("list", memes.toTypedArray())
i.putExtras(extras)
(context as Activity).startActivityForResult(i, 777)

and this is inside activity B:

private lateinit var memes: MutableList<Memes>


override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_gallery_show)

    memes = (this?.intent?.extras?.get("list") as? Array<Memes>)?.asList()!!.toMutableList()
}

ANSWER

Answered 2021-Jun-15 at 19:49

You can use simply intent.putExtra instead of worrying about which variant like put_____Extra to use.

When extracting the value, you can use intent.extras to get the Bundle and then you can use get() on the Bundle and cast to the appropriate type. This is easier than trying to figure out which intent.get____Extra function to use to extract it, since you will have to cast it anyway.

The below code works whether your data class is Serializeable or Parcelable. You don't need to use arrays, because ArrayLists themselves are Serializeable, but you do need to convert from MutableList to ArrayList.

// Packing and sending the data:
val i = Intent(context, GalleryShow::class.java)
i.putExtra("list", ArrayList(memes)) // where memes is your MutableList<Meme> property
startActivityForResult(i, 777)

// Unpacking the data in the other activity:
memes = intent.extras?.get("list") as MutableList<Meme>

Source https://stackoverflow.com/questions/67989536

QUESTION

Create a DateTimeFormater with an Optional Section at Beginning

Asked 2021-Jun-15 at 19:54

I have timecodes with this structure hh:mm:ss.SSS for which i have a own Class, implementing the Temporal Interface. It has the custom Field TimecodeHour Field allowing values greater than 23 for hour. I want to parse with DateTimeFormatter. The hour value is optional (can be omitted, and hours can be greater than 24); as RegEx (\d*\d\d:)?\d\d:\d\d.\d\d\d

For the purpose of this Question my custom Field can be replaced with the normal HOUR_OF_DAY Field.

My current Formatter

DateTimeFormatter UNLIMITED_HOURS = new DateTimeFormatterBuilder()
    .appendValue(ChronoField.HOUR_OF_DAY, 2, 2,SignStyle.NEVER)
    .appendLiteral(':')
    .parseDefaulting(TimecodeHour.HOUR, 0)
    .toFormatter(Locale.ENGLISH);
DateTimeFormatter TIMECODE = new DateTimeFormatterBuilder()
    .appendOptional(UNLIMITED_HOURS)
    .appendValue(MINUTE_OF_HOUR, 2)
    .appendLiteral(':')
    .appendValue(SECOND_OF_MINUTE, 2)
    .appendFraction(MILLI_OF_SECOND, 3, 3, true)
    .toFormatter(Locale.ENGLISH);

Timecodes with a hour value parse as expected, but values with hours omittet throw an Exception

java.time.format.DateTimeParseException: Text '20:33.123' could not be parsed at index 5

I assume, as hour and minute have the same pattern, the parser starts at front and captures the minute value for the optional section. Is this right, and how can solve this?

ANSWER

Answered 2021-Jun-11 at 11:06

I think fundamentally the problem is that it gets stuck going down the wrong path. It sees a field of length 2, which we know is the minutes but it believes is the hours. Once it believes the optional section is present, when we know it's not, the whole thing is destined to fail.

This is provable by changing the minimum hour length to 3.

.appendValue(TimecodeHour.HOUR, 3, 4, SignStyle.NEVER)

It now knows that the "20" cannot be hours, since hours requires at least 3 digits. With this small change, it now parses correctly, whether the optional section is present or not.

So presuming that the hours field really does need to be between 2 and 4 digits, I think you're stuck with having to implement a workaround. For example, count the number of colons in the string and use a different formatter depending on which one you run into. Using a different delimiter besides a colon for the hours would also work.

The parser logic has undergone quite a few bug fixes over the various Java versions since it was introduced - as you can imagine, there are so many potential edge cases - so I was hopeful using a recent version of Java would make this problem disappear. Unfortunately, it seems even in Java 16, the behaviour is still the same.

Source https://stackoverflow.com/questions/67935444

QUESTION

How to required Date and time using Java?

Asked 2021-Jun-15 at 19:07

**I am trying to write the code for getting the date in required format , I have got the dates but how to add the required time with it , here I have

startDate - 1/08/2021 00:00:00 , EndDate - 20/08/2021 23:59:59 , increment days: 10

and the Expected output is :

05/08/2021 00:00:00 to 10/08/2021 23:59:59 , 11/08/2021 00:00:00 to 15/08/2021 23:59:59 ,

This is the Code which I was trying to write , any help is appreciated

import java.time.LocalDate;
import java.time.format.DateTimeFormatter;
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;

public class DateTest {
    public static List<LocalDate> getDaysBetweenDates(LocalDate startDate, LocalDate endDate, int interval) {
        List<LocalDate> dates = new ArrayList<>();
        while (endDate.isAfter(startDate)) {
            dates.add(startDate);
            startDate = startDate.plusDays(interval-1);
            dates.add(startDate);
            startDate = startDate.plusDays(1);
        }
        return dates;
    }

    public static void main(String[] args) {
        int interval = 5;
        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("dd-MM-yyyy HH:mm:ss",Locale.US);
        List<LocalDate> daysBetweenDates = getDaysBetweenDates(LocalDate.parse("01-08-2021 00:00:00", formatter),
                LocalDate.parse("20-08-2021 23:59:59", formatter), interval);
        System.out.println(daysBetweenDates);
    }
}

ANSWER

Answered 2021-Jun-15 at 12:58

Use the date-time API.
(The code should be self-explanatory.)

import java.time.LocalDateTime;
import java.time.Period;
import java.time.ZoneId;
import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;

public class DateTest {
    public static List<ZonedDateTime> getDaysBetweenDates(ZonedDateTime startDate, ZonedDateTime endDate, int interval) {
        List<ZonedDateTime> dates = new ArrayList<>();
        while (!startDate.isAfter(endDate)) {
            dates.add(startDate);
            if (Period.between(startDate.toLocalDate(), endDate.toLocalDate()).getDays() < interval) {
                startDate = endDate;
            }
            else {
                startDate = startDate.plusDays(interval);
            }
            dates.add(startDate);
            startDate = startDate.plusDays(1);
        }
        return dates;
    }

    public static void main(String[] args) {
        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("dd/MM/yyyy HH:mm:ss", Locale.ENGLISH);
        List<ZonedDateTime> dates = getDaysBetweenDates(ZonedDateTime.of(LocalDateTime.parse("05/08/2021 00:00:00", formatter), ZoneId.systemDefault()),
                                                        ZonedDateTime.of(LocalDateTime.parse("15/08/2021 23:59:59", formatter), ZoneId.systemDefault()),
                                                        5);
        for (int i = 0; i < dates.size(); i+=2) {
            System.out.printf("%s to %s , ",
                              dates.get(i).format(formatter),
                              dates.get(i + 1).format(formatter));
        }
    }
}

Output when running above code as follows:

05/08/2021 00:00:00 to 10/08/2021 00:00:00 , 11/08/2021 00:00:00 to 15/08/2021 23:59:59 ,

Source https://stackoverflow.com/questions/67985909

QUESTION

While loop doesn't exit after file download

Asked 2021-Jun-15 at 18:57

I've got the following code to download a file being transmitted over TCP:

        try (OutputStream out = new FileOutputStream(path); InputStream is = socket.getInputStream();) {
            byte[] bytes = new byte[1024];
            int count, xp = 0;
            while ((count = is.read(bytes)) > 0) {      // TODO after upload the service doesn't leave while loop
                out.write(bytes, 0, count);
            }
            System.out.println("hello");
         ...

upload code:

if (ready.equalsIgnoreCase(CdnResponse.READY.getContext())){
    int read = 0;
    byte[] bytes = new byte[1024];
    while ((read = inputStream.read(bytes)) != -1) {
        out.write(bytes, 0, read);
    }

}

The upload exits its loop fine.

Once all the bytes have been processed (they are always processed successfully, however the loop is never exited), the file is created, without a single issue, but, the loop doesn't exit.

ANSWER

Answered 2021-Jun-15 at 09:31

TCP/IP connections are designed to be long-lived streaming connections (built on top of the out-of-order, no-guarantee, packet-based IP protocol).

That means that is.read(bytes) does exactly what the spec says it will: It will wait until at least 1 byte is available, OR the 'end of stream' signal comes in. As long as neither occurs (no bytes arrive, but the stream isn't closed), it will dutifully block. Forever if it has to.

The solution is to either [A] pre-send the size of the file, and then adjust the loop to just exit once you've received that amount of bytes, or [B] to close the stream.

To close the stream, close the socket. It kinda sounds like you don't wanna do that (that you are multiplexing multiple things over the stream, i.e. that after transfering a file, you may then send other commands).

So, option A, that sounds better. However, option A has as a prerequisite that you know how many bytes are going to come out of inputStream. If it's a file, that's easy, just ask for its size. If it's streamed data, that would require that, on the 'upload code side', you first stream the whole thing into a file and only then stream it over the network which is unwieldy and potentially inefficient.

If you DO know the size, it would look something like (and I'm going to use newer APIs here, you're using some obsolete, 20 year old outdated stuff):

// upload side
void upload() {
  Path p = Paths.get("/path/to/file/you/want/to/send");
  long fileSize = Files.size(p);
  out.write(longToBytes(fileSize);
  try (InputStream in = Files.newInputStream(p)) {
    in.transferTo(out);
  }
}

public static byte[] longToBytes(long x) {
    ByteBuffer buffer = ByteBuffer.allocate(Long.BYTES);
    buffer.putLong(x);
    return buffer.array();
}

This code has the following properties:

First it sends 8 bytes, in big endian order, which is the size of the data to come.
It uses the new java.nio.file API.
It uses the new transferTo method in InputStream, which avoids the rigamarole of having to declare a byte array to serve as buffer, and a while loop.

Then on the download side:

void download() {
  long size = bytesToLong(in.readNBytes(8));
  Path p = Paths.get("/file/to/store/data/at");
  // Generally network transfer sizes are a bit higher than 1k;
  // up to 64k in fact. Best to declare a larger buffer!
  byte[] bb = new byte[65536];
  try (OutputStream out = Files.newOutputStream(p)) {
    while (size > 0) {
      int count = in.read(bb);
      if (count == -1) throw new IOException("Unexpected end of stream");
      out.write(bb, 0, count);
      size -= count;
    }
  }
}

public static long bytesToLong(byte[] bytes) {
    ByteBuffer buffer = ByteBuffer.allocate(Long.BYTES);
    buffer.put(bytes);
    buffer.flip();//need flip 
    return buffer.getLong();
}

This code:

Uses the new readNBytes method to read that size in, first.

If you do not know how large the incoming data is, you need to write a little protocol. For example:

A size is sent, in the form of 2 bytes, in big endian order, unsigned. Then that many bytes follow, then another size is sent, ad infinitum.
When the stream is completed, a size of 0 is sent (so, 2 bytes with value 0), which indicates the file is complete.

I'll leave it as an exercise for you to implement the up- and download side if this is what you need.

Source https://stackoverflow.com/questions/67983348

QUESTION

Micronaut java httpclient creation with the existing server

Asked 2021-Jun-15 at 18:37

I have a Micronaut application running with the below configuration:

micronaut:
  server:
    cors:
       enabled: true 
    port: 8080

Now I have an enhancement where I want to call a 3rd party URL and get the response in my application (one of the module in my application). I used the below code snippet:

    EmbeddedServer server = ApplicationContext.run(EmbeddedServer.class);
    HttpClient client = server .getApplicationContext() .createBean(HttpClient.class, server.getURL());
    HttpRequest req = HttpRequest.GET(urlHost);
    HttpResponse<String> response = client.toBlocking().exchange(req, String.class);

But this is not working. I get port already in use. I did not find much help in google because Micronaut's HttpClient is usually used in Micronaut Test which is not in my case. Is this possible to use it in my application? If so how? Thanks in Advance.

ANSWER

Answered 2021-Jun-13 at 09:19

It is because you are starting another server by ApplicationContext.run(EmbeddedServer.class).

You don't need it. It is enough to inject HttpClient into your class by constructor:

@Singleton 
public class MyClient {

    private final RxHttpClient client;

    public MyClient(@Client("https://some.third-party.com") RxHttpClient client) {  
        this.client = client;
    }

    HttpResponse<String> getSomething(Integer id) {
        URI uri = UriBuilder.of("/some-objects").path(id).build();
        return client.toBlocking().exchange(HttpRequest.GET(uri), String.class);
    }
}

If you have third-party server URL in application configuration under some-service.url path for example, then you can use @Client("${some-service.url}")

Another option is to define declarative client for the third-party server and then inject it in your classes where needed.

First define client interface for your third-party service:

@Client("some-service")
public interface SomeServiceClient {

    @Get("/api/some-objects/{id}")
    String getSomeObject(@QueryValue("id") id: Integer);
}

Add client configuration for that service in application configuration (application.yaml):

micronaut:
  http:
    services:
      some-service:
        url: "https://some.third-party.com"
        read-timeout: 1m

And then you can inject the SomeServiceClient where you need it:

@Singleton 
public class SomeServiceConsumer {

    private final SomeServiceClient client;

    public SomeServiceConsumer(SomeServiceClient client) {  
        this.client = client;
    }

    void doWithSomething(Integer id) {
        String object = client.getSomeObject(id);
        ... // processing of object here
    }
}

You can find more information in a Micronaut documentation https://guides.micronaut.io/latest/micronaut-http-client-gradle-java.html

Source https://stackoverflow.com/questions/67946864

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

No vulnerabilities reported

Install Java

You can download it from GitHub.
You can use Java like any standard Java library. Please include the the jar files in your classpath. You can also use any IDE and you can run and debug the Java component as you would do with any other Java program. Best practice is to use a build tool that supports dependency management such as Maven or Gradle. For Maven installation, please refer maven.apache.org. For Gradle installation, please refer gradle.org .

Support

For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .