android socket closed,android_socket编程异常处理--求高手解答

客户端代码：

package com.example.talkingroom;

import java.io.BufferedReader;

import java.io.BufferedWriter;

import java.io.IOException;

import java.io.InputStreamReader;

import java.io.OutputStreamWriter;

import java.net.Socket;

import java.net.UnknownHostException;

import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.EditText;

import android.widget.TextView;

public class YaoChatRoomAndroid extends Activity {

/** Called when the activity is first created. */

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.chatroom);

findviews();

setonclick();

}

private EditText chattxt;

private TextView chattxt2;

private Button chatok;

public void findviews()

{

chattxt = (EditText)this.findViewById(R.id.chattxt);

chattxt2 = (TextView)this.findViewById(R.id.chattxt2);

chatok   = (Button)this.findViewById(R.id.chatOk);

}

private void setonclick()

{

chatok.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

try {

connecttoserver(chattxt.getText().toString());

} catch (UnknownHostException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

});

}

public void connecttoserver(String socketData) throws UnknownHostException, IOException

{

Socket socket=RequestSocket("169.254.74.214",5000);

SendMsg(socket,socketData);

String txt = ReceiveMsg(socket);

this.chattxt2.setText(txt);

}

private Socket RequestSocket(String host,int port) throws UnknownHostException, IOException

{

Socket socket = new Socket(host, port);

return socket;

}

private void SendMsg(Socket socket,String msg) throws IOException

{

BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));

writer.write(msg.replace("\n", " ")+"\n");

writer.flush();

}

private String ReceiveMsg(Socket socket) throws IOException

{

BufferedReader reader = new BufferedReader(new InputStreamReader(socket.getInputStream()));

String txt=reader.readLine();

return txt;

}

}

服务器端代码：

package com.android.yao;

import java.io.BufferedReader;

import java.io.BufferedWriter;

import java.io.IOException;

import java.io.InputStreamReader;

import java.io.OutputStreamWriter;

import java.net.ServerSocket;

import java.net.Socket;

public class YaoChatServer extends Thread {

private YaoChatServer() throws IOException {

CreateSocket();

//创建Socket服务器

}

public void run() {

Socket client;

String txt;

try {

while (true)

//线程无限循环，实时监听socket端口

{

client=ResponseSocket();

//响应客户端链接请求。。

while(true)

{

txt=ReceiveMsg(client);

System.out.println(txt);

//链接获得客户端发来消息，并将其显示在Server端的屏幕上

SendMsg(client,txt);

//向客户端返回消息

if(true)break;

//中断，继续等待链接请求

}

CloseSocket(client);

//关闭此次链接

}

}

catch (IOException e) {

System.out.println(e);

}

}

private ServerSocket server = null;

private static final int PORT = 5000;

private BufferedWriter writer;

private BufferedReader reader;

private void CreateSocket() throws IOException

{

server = new ServerSocket(PORT, 100);

System.out.println("Server starting..");

}

private Socket ResponseSocket() throws IOException

{

Socket client = server.accept();

System.out.println("client connected..");

return client;

}

private void CloseSocket(Socket socket) throws IOException

{

reader.close();

writer.close();

socket.close();

System.out.println("client closed..");

}

private void SendMsg(Socket socket,String Msg) throws IOException

{

writer = new BufferedWriter(

new OutputStreamWriter(socket.getOutputStream()));

writer.write(Msg+"\n");

writer.flush();

}

private String ReceiveMsg(Socket socket) throws IOException

{

reader = new BufferedReader(

new InputStreamReader(socket.getInputStream()));

System.out.println("server get input from client socket..");

String txt="Sever send:"+reader.readLine();

return txt;

}

public static void main(final String args[]) throws IOException {

YaoChatServer yaochatserver = new YaoChatServer();

if (yaochatserver != null) {

yaochatserver.start();

}

}

}

所报异常：