老师的作业第一次运行一直不正常，还有socket关闭的问题，请帮忙看下
服务器端代码
package com.nettest;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
public class UDPserver {
public static void main(String[] args) throws IOException {
byte[] data=null;
DatagramPacket packet = null;
DatagramSocket socket =new DatagramSocket(8800);
UDPThread thread=null;
int count =1;
while(true){
data=new byte[1024];
packet = new DatagramPacket(data, data.length);
System.out.println("服务器端已启动，等待客户端连接");
socket.receive(packet);
System.out.println("客户端连接");
System.out.println("客户端连接数量为："+count);
thread=new UDPThread(packet,socket,data);
thread.start();
count++;
}
}
}客户端代码
package com.nettest;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.SocketException;
import java.net.UnknownHostException;
public class UDPClient {
public static void main(String[] args) throws IOException {
InetAddress add=InetAddress.getByName("localhost");
int port=8800;
byte[] data="用户名：admin；密码：123".getBytes();
DatagramPacket packet=new DatagramPacket(data, data.length,add,port);
DatagramSocket socket=new DatagramSocket();
socket.send(packet);
byte[] data2=new byte[1024];
DatagramPacket packe2=new DatagramPacket(data2, data2.length);
socket.receive(packe2);
String s=new String(data2,0,packe2.getLength());
System.out.println(s);
socket.close();
}
}线程代码
package com.nettest;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.SocketException;
public class UDPThread extends Thread {
byte[] data=null;
DatagramPacket packet = null;
DatagramSocket socket = null;
DatagramPacket packet2=null;
byte[] data2=null;
UDPThread(DatagramPacket packet,DatagramSocket socket,byte[] data){
this.packet=packet;
this.socket=socket;
this.data=data;
}
public synchronized void run(){
try {
String s=new String(data,0,packet.getLength());
System.out.println("客户端说："+s);
InetAddress add=packet.getAddress();
System.out.println("客户端IP："+add);
data2="欢迎您".getBytes();
int port=packet.getPort();
packet2=new DatagramPacket(data2, data2.length,add,port);
socket.send(packet2);
}
catch (SocketException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
finally{
//socket.close();
}
}
}第一运行结果一直是这样：
“服务器端已启动，等待客户端连接”这一句出现了两次，客户端正常。
还有如果我在线程代码中的finally里设置关闭datapramsocket在运行的时候会报错，请问老师应该怎么解决？
