標準的なjavaライブラリだけでredmineにissue作る

gistfile1.java

import java.io.*;
import java.net.*;

public class Test {
  public static void main(String [] args) {

    try {
      String content="{\"issue\": {\"project_id\": 1, \"subject\": \"Example\"}}";
      log(content);

      URL url = new URL("(redmineのURI)/issues.json");

      HttpAuthenticator http_authenticator = new HttpAuthenticator("username", "password");
      Authenticator.setDefault(http_authenticator);

      HttpURLConnection connection = (HttpURLConnection)url.openConnection();

      connection.setRequestMethod("POST");
      connection.setRequestProperty("Content-type", "application/json");
      connection.setRequestProperty("Content-length", Integer.toString(content.length()));
      connection.setDoOutput(true);
      connection.setDoInput(true);

      DataOutputStream out = new DataOutputStream(connection.getOutputStream());
      out.writeBytes(content);
      out.flush();
      out.close();
      connection.disconnect();

      BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
      String line;
      while (null != (line = in.readLine())) {
        log(line);
      }
    } catch(Exception e) {
      e.printStackTrace();
    }
  }

  private static void log(String message) {
    System.out.println(message);
  }
}

class HttpAuthenticator extends Authenticator {
  private String username;
  private String password;
  public HttpAuthenticator(String username, String password){
    this.username = username;
    this.password = password;
  }
  protected PasswordAuthentication getPasswordAuthentication(){
    return new PasswordAuthentication(username, password.toCharArray());
  }
  public String myGetRequestingPrompt(){
    return super.getRequestingPrompt();
  }
}