Android客户端通过socket与服务器通信

package com.sec.chatroomandroid;

import java.io.BufferedReader;  
import java.io.BufferedWriter;  
import java.io.InputStreamReader;  
import java.io.OutputStreamWriter;  
import java.io.PrintWriter;  
import java.net.Socket;  
  
import android.app.Activity;  
import android.os.Bundle;  
import android.os.StrictMode;
import android.util.Log;  
import android.view.View;  
import android.view.View.OnClickListener;  
import android.widget.Button;  
import android.widget.EditText;  
import android.widget.TextView;  
  
public class MainActivity extends Activity  
{  
    private final String        DEBUG_TAG   = "Activity01";  
      
    private TextView    mTextView = null;  
    private EditText    mEditText = null;  
    private Button      mButton = null;  
    /** Called when the activity is first created. */  
    @Override  
    public void onCreate(Bundle savedInstanceState)  
    {  
        StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder().detectDiskReads().detectDiskWrites().detectNetwork().penaltyLog().build());
        StrictMode.setVmPolicy(new StrictMode.VmPolicy.Builder().detectLeakedSqlLiteObjects().detectLeakedClosableObjects().penaltyLog().penaltyDeath().build());
        
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.activity_main);  
          
        mButton = (Button)findViewById(R.id.Button01);  
        mTextView = (TextView)findViewById(R.id.TextView01);  
        mEditText = (EditText)findViewById(R.id.EditText01);  
          
        //登陆  
        mButton.setOnClickListener(new OnClickListener()  
        {  
            public void onClick(View v)  
            {  
                Socket socket = null;  
                String message = mEditText.getText().toString() + "\r\n";   
                try   
                {     
                    //创建Socket  
                    socket = new Socket("172.16.29.201",5000); 
                    //向服务器发送消息  
                    PrintWriter out = new PrintWriter( new BufferedWriter( new OutputStreamWriter(socket.getOutputStream())),true);        
                    out.println(message);   
                      
                    //接收来自服务器的消息  
                    BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream()));   
                    String msg = br.readLine();   
                      
                    if ( msg != null )  
                    {  
                        mTextView.setText(msg);  
                    }  
                    else  
                    {  
                        mTextView.setText("数据错误!");  
                    }  
                    //关闭流  
                    out.close();  
                    br.close();  
                    //关闭Socket  
                    socket.close();   
                }  
                catch (Exception e)   
                {  
                    // TODO: handle exception  
                    Log.e(DEBUG_TAG, e.toString());  
                }  
            }  
        });  
    }  
} 

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.sec.chatroomandroid"
    android:versionCode="1"
    android:versionName="1.0" >
    
    <uses-permission android:name="android.permission.INTERNET"/>

    <uses-sdk
        android:minSdkVersion="14"
        android:targetSdkVersion="21" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

<?xml version="1.0" encoding="utf-8"?>  
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  
    android:orientation="vertical"  
    android:layout_width="fill_parent"  
    android:layout_height="fill_parent"  
    >  
    <TextView    
    android:id="@+id/TextView01"   
    android:layout_width="fill_parent"   
    android:layout_height="wrap_content"   
    android:text="@string/Message_Recv"  
    />  
    <EditText   
    android:id="@+id/EditText01"   
    android:hint="@string/Message_Send"   
    android:layout_width="fill_parent"   
    android:layout_height="wrap_content">  
    </EditText>  
    <Button   
    android:id="@+id/Button01"  
    android:layout_width="fill_parent"  
    android:layout_height="wrap_content"  
    android:text="@string/Send"  
    />    
</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <string name="app_name">ChatRoomAndroid</string>
    <string name="Message_Recv">这里显示接收到服务器发来的信息</string>
    <string name="Message_Send">输入要发送的内容</string>
    <string name="Send">发送</string>

</resources>

import java.io.BufferedReader;  
import java.io.BufferedWriter;  
import java.io.InputStreamReader;  
import java.io.OutputStreamWriter;  
import java.io.PrintWriter;  
import java.net.ServerSocket;  
import java.net.Socket;  
  
public class ChatServer implements Runnable  
{  
    public void run()  
    {  
        try  
        {  
            //创建ServerSocket  
            ServerSocket serverSocket = new ServerSocket(5000,10);  
            while (true)  
            {  
                //接受客户端请求  
                Socket client = serverSocket.accept();  
                System.out.println("accept");  
                try  
                {  
                    //接收客户端消息  
                    BufferedReader in = new BufferedReader(new InputStreamReader(client.getInputStream()));  
                    String str = in.readLine();  
                    System.out.println("read: " + str);    
                    //向客户端发送消息  
                    PrintWriter out = new PrintWriter( new BufferedWriter( new OutputStreamWriter(client.getOutputStream())),true);        
                    out.println("server message");   
                    //关闭流  
                    out.close();  
                    in.close();  
                }  
                catch (Exception e)  
                {  
                    System.out.println(e.getMessage());  
                    e.printStackTrace();  
                }  
                finally  
                {  
                    //关闭  
                    client.close();  
                    System.out.println("close");  
                }
                serverSocket.close();
            }
   
        }  
        catch (Exception e)  
        {  
            System.out.println(e.getMessage());  
        }  
    }  
    //main函数，开启服务器  
    public static void main(String a[])  
    {  
        Thread desktopServerThread = new Thread(new ChatServer());  
        desktopServerThread.start();  
    }  
}