先说说我的问题  
1.我的页面编码是UTF-8  电脑默认编码是GBK
2.代码
UDP 发送端

1. public static void main(String[] args) throws Exception {
   
2. 
   
3. DatagramSocket socket = new DatagramSocket(7777);
   
4. BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
   
5. String line = null;
   
6. byte[] buf = new byte[8192];
   
7. DatagramPacket packet = null;
   
8. while ((line = br.readLine()) != null) {
   
9. if("88".equals(line))
   
10. break;
    
11. buf = line.getBytes();
    
12. packet = new DatagramPacket(buf, buf.length, InetAddress.getByName("127.0.0.1"), 10000);
    
13. socket.send(packet);
    
14. }
    
15. br.close();
    
16. socket.close();
    
17. 
    
18. }
    
19. }

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UDP接收端

1. public static void main(String[] args) throws Exception, UnknownHostException {
   
2. 
   
3. 
   
4. DatagramSocket socket = new DatagramSocket(10000);
   
5. 
   
6. while (true) {
   
7. 
   
8. byte[] buf = new byte[1024*64];
   
9. DatagramPacket packet = new DatagramPacket(buf, buf.length);
   
10. socket.receive(packet);
    
11. System.out.println(new String(packet.getData(),"UTF-8"));
    
12. 
    
13. 
    
14. 
    
15. }
    
16. 
    
17. }
    
18. 
    
19. 
    
20. }
    

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3.我在发送端发送你好  在接收端出现浣犲ソ 这说明了 UTF-8编码  GBK解码  我想问的是
DatagramPacket怎么能用UTF-8 解码 或者是 让我的程序不出现错误 求高手啊

发送端
public static void main(String[] args) throws Exception {
        
        DatagramSocket socket = new DatagramSocket();
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String line = null;
        byte[] buf = new byte[8192];
        DatagramPacket packet = null;
        while ((line = br.readLine()) != null) {
        if("88".equals(line))
        break;
        buf = line.getBytes("UTF-8");
        packet = new DatagramPacket(buf, buf.length, InetAddress.getByName("127.0.0.1"), 10000);
        socket.send(packet);
        }
        br.close();
        socket.close();
        
        }
接收端
DatagramSocket socket = new DatagramSocket(10000);

                while (true) {

                byte[] buf = new byte[1024*64];
                DatagramPacket packet = new DatagramPacket(buf, buf.length);
                socket.receive(packet);
                 
                System.out.println( new String(packet.getData(),"UTF-8"));



                }
这样就可以了 你两边要统一，要么都写要么都不写
发送端 buf = line.getBytes("UTF-8");
接收端System.out.println( new String(packet.getData(),"UTF-8"));

我按你说的做还是不行  我有想了想  既然是用的是UTF-8编码 GBK解码 出错 而且我不能改变解码方式   那么我就改变编码 用GBK
发送端

1. public class UDPSend2 {
   
2. 
   
3. public static void main(String[] args) throws Exception {
   
4. 
   
5. DatagramSocket socket = new DatagramSocket(7777);
   
6. BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
   
7. String line = null;
   
8. byte[] buf = new byte[8192];
   
9. DatagramPacket packet = null;
   
10. while ((line = br.readLine()) != null) {
    
11. if("88".equals(line))
    
12. break;
    
13. buf = line.getBytes("GBK");
    
14. packet = new DatagramPacket(buf, buf.length, InetAddress.getByName("127.0.0.1"), 10000);
    
15. socket.send(packet);
    
16. }
    
17. br.close();
    
18. socket.close();
    
19. 
    
20. }
    
21. }

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竟然通过了 我分析
1.buf = line.getBytes("GBK"); 你好俩字变成字节 而DatagramPacket packet = new DatagramPacket(buf, buf.length); 是默认去查GBK码表  所以出来了
2.你的那种在我的机器试过了 不行 不知道怎么回事

3.我用你那种方法 代码

1. public class UDPReceive {
   
2. /*
   
3. * 1.定义socket在接收端的socket要有端口号 2.定义packet 接收数据 3.取出来打印
   
4. */
   
5. 
   
6. public static void main(String[] args) throws Exception, UnknownHostException {
   
7. 
   
8. 
   
9. DatagramSocket socket = new DatagramSocket(10000);
   
10. 
    
11. while (true) {
    
12. 
    
13. byte[] buf = new byte[40];
    
14. DatagramPacket packet = new DatagramPacket(buf, buf.length);
    
15. socket.receive(packet);
    
16. 
    
17. System.out.println(Arrays.toString(packet.getData()));
    
18. System.out.println(new String(packet.getData(),"UTF-8"));
    
19. 
    
20. 
    
21. 
    
22. }
    
23. 
    
24. }
    
25. 
    
26. 
    
27. }

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结果
[-26, -75, -93, -25, -118, -78, -29, -126, -67, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
浣犲ソ
解码出现问题了
System.out.println(new String(packet.getData(),"UTF-8")); 这句话为什么不能按UTF-8解码  求解！！！！！！

谁帮解一下