Java 和我应该使用哪些 Stun 库？

Posted 2023-04-15

【中文标题】Java 和我应该使用哪些 Stun 库？

【英文标题】：Java and Which Stun libraries i should use?

【发布时间】：2011-08-07 22:34:30

【问题描述】：

Java，我试图编写自己的 STUN 客户端，但似乎我犯了错误，因此大多数时候它都被冻结了。所以我想知道哪些 STUN 客户端库可用于 Java，以便开始使用。

跟进：（同时尝试跟进，仍然没有解决 NAT/防火墙背后的问题）

第 1 步：Stun 类：http://babbly.googlecode.com/svn/trunk/src/org/babbly/core/net/InetAddresResolver.java

/* modified */
import java.io.*;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.net.URLEncoder;
import java.net.UnknownHostException;

import net.java.stun4j.StunAddress;
import net.java.stun4j.client.SimpleAddressDetector;
import java.util.Random;

public class stun


  public static final int    MAX_PORT_NUMBER = 65535;
  public static final int    MIN_PORT_NUMBER = 1024;
  private static DatagramSocket socket = null;
  private static SimpleAddressDetector detector;

    public static synchronized InetAddress resolveInternetInterface(InetAddress dest)
    

        InetAddress networkInterface = null;

        if(dest == null)
        
            try 
                dest = InetAddress.getByName("78.12.2.61");
             catch (UnknownHostException e) 
            
        

        if(dest != null)
        
            socket.connect(dest, getRandomPortNumber());
            networkInterface = socket.getLocalAddress();
            socket.disconnect();    
        

        if(networkInterface == null || networkInterface.isAnyLocalAddress())
        
            try
                networkInterface = InetAddress.getLocalHost();
            
            catch (Exception ex)
            
        
        return networkInterface;
    

    public static synchronized InetAddress resolveInternetInterface()
    
        return resolveInternetInterface(null);
    

    public static int getRandomPortNumber()
    
        return new Random().nextInt(MAX_PORT_NUMBER - MIN_PORT_NUMBER);
    

  public static InetSocketAddress getPublicAddress(int localPort)
  
    InetSocketAddress resolvedAddr = null;
    String stunAddressStr = "stun.xten.com";
    String portStr = "3478";
    int stunPort = Integer.parseInt(portStr);

    StunAddress stunAddr = new StunAddress(stunAddressStr, stunPort);
    detector = new SimpleAddressDetector(stunAddr);

    System.out.println("Created a STUN Address detector for the following " + "STUN server: " + stunAddressStr + ":" + stunPort);

    detector.start();
    System.out.println("STUN server detector started;");

    StunAddress mappedAddress = null;
    try 
      mappedAddress = detector.getMappingFor(localPort);
     catch (IOException e) 
      e.printStackTrace();
    

    System.out.println("lala");
    detector.shutDown();
    if(mappedAddress != null)
    
      System.out.println("stun: no nat detected");
      resolvedAddr = mappedAddress.getSocketAddress();

     else 

      System.out.println("sun: nat detected, hitting the ip");
      String dstProperty = "78.22.22.61"; // put the ip of the target to hit
      InetAddress destination = null;
      try 
        destination = InetAddress.getByName(dstProperty);
       catch (UnknownHostException e) 
        e.printStackTrace();
      
      InetAddress publicHost = resolveInternetInterface(destination);
      resolvedAddr = new InetSocketAddress(publicHost, localPort);

    

    return resolvedAddr;

  

第 2 步：使用它

InetSocketAddress test;
test = stun.getPublicAddress(40446);
System.out.println("STUN: " + test.toString());

第 3 步：结果

Created a STUN Address detector for the following STUN server: stun.xten.com:3478
STUN server detector started;
Apr 18, 2011 7:04:16 PM net.java.stun4j.stack.NetAccessPoint start
INFO: Bound a socket on ap: net.java.stun4j.stack.AccessPoint@0.0.0.0/0.0.0.0:40446 status:  running
Apr 18, 2011 7:04:17 PM net.java.stun4j.stack.NetAccessPoint stop
INFO: Closed socket on ap net.java.stun4j.stack.AccessPoint@0.0.0.0/0.0.0.0:40446 status:  running
lala
stun: no nat detected
STUN: /78.12.2.61:40446
BUILD SUCCESSFUL (total time: 12 seconds)

【参考方案1】：

有

JSTUN：http://jstun.javawi.de/ 眩晕：http://java.net/projects/stun

另见：STUN, TURN, ICE library for Java

【讨论】：

这个有一个内置的 JAR 和示例。您提到的链接很少，但是那些有效或没有 JAR 文件，它们是否有任何静态模块或其中大部分是在 SERVER 中构建的而不是简单的 Client 方法？例如：code.google.com/p/babbly/source/browse/trunk/src/org/babbly/…

第一个没有任何示例或文档。第二个几乎是一团糟。第三个链接没有准确答案。

JAR 文件中有什么内容吗？只是一个小的，上面我准备了一个，但代码太多了。

JSTUN 在一个 Jar 文件中，包含客户端和服务器。如果你下载源代码，里面有文档，以演示和单元测试的形式。

你写的是STUN客户端还是STUN服务器？使用 JSTUN，您可以同时测试服务器和客户端。有了它，您可以修复自己的实现。