本文实例讲述了Android基于socket实现的简单C/S聊天通信功能。分享给大家供大家参考，具体如下：

主要想法：在客户端上发送一条信息，在后台开辟一个线程充当服务端，收到消息就立即回馈给客户端。

第一步：创建一个继续Activity的SocketClientActity类，包为com.pku.net

编写布局文件socketclient.xml，代码如下：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<ScrollView
android:id="@+id/scrollview3"
android:layout_width="fill_parent"
android:layout_height="wrap_content" >
<TextView
android:id="@+id/chattxt2"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="#98F5FF" />
</ScrollView>
<EditText
android:id="@+id/chattxt"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
<Button
android:id="@+id/chatOk"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="发送" >
</Button>
</LinearLayout>

接下来编写SocketClientActity.Java文件：

package com.pku.net;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.net.UnknownHostException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.Socket;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.*;
public class SocketClientActivity extends Activity {
SocketServerThread yaochatserver;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.socketclient);
try {
yaochatserver = new SocketServerThread();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
if (yaochatserver != null) {
yaochatserver.start();
}
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("127.0.0.1", 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;
}
}

编写AndroidManifest.xml文件：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.pku.net"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk android:minSdkVersion="8" />
<uses-permission android:name="android.permission.INTERNET"/>
<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name" >
<activity
android:name=".HttpURLActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name="GetNetImage"></activity>
<activity android:name="HttpClientActivity"></activity>
<activity android:name="SocketClientActivity"></activity>
</application>
</manifest>

最后编写后台服务端的文件SocketServerThread.java，代码如下：

package com.pku.net;
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 SocketServerThread extends Thread {
public SocketServerThread() 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 {
SocketServerThread yaochatserver = new SocketServerThread();
if (yaochatserver != null) {
yaochatserver.start();
}
} */
}

运行效果如下图：

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希望本文所述对大家Android程序设计有所帮助。