Android 网络编程 Socket

1.服务端开发

创建一个Java程序

public class MyServer {

// 定义保存所有的Socket，与客户端建立连接得到一个Socket
public static List<Socket> socketList = new ArrayList<Socket>();

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

ServerSocket server = new ServerSocket(8888);

while (true) {
System.out.println("start listening port 8888");
Socket socket = server.accept();
System.out.println("connect succeed.");
socketList.add(socket);
//每当客户端连接之后启动一条ServerThread线程为该客户端服务
new Thread(new MyServerRunnable(socket)).start();

}
}

public static class MyServerRunnable implements Runnable {
// 定义当前线程处理的Socket
Socket socket = null;
// 该线程所处理的Socket所对应的输入流
BufferedReader bufferedReader = null;

public MyServerRunnable(Socket socket) {
this.socket = socket;
try {
// 将服务器端的输入流的数据放入读Buffer中
bufferedReader = new BufferedReader(new InputStreamReader(
socket.getInputStream()));
} catch (Exception e) {
e.printStackTrace();
}

}

@Override
public void run() {
String content = null;
// 采用循环不断的从Socket中读取客户端发送过来的数据
while ((content = readFromClient()) != null) {
// 遍历socketList中的每一个Socket，将读取的内容向每个Socket发送一次
for (Socket socket : MyServer.socketList) {
OutputStream outputStream;
try {
outputStream = socket.getOutputStream();
outputStream.write(("Server: " + content + "\n").getBytes("utf-8"));
} catch (IOException e) {
e.printStackTrace();
}
}
}

}

// 定义读取客户端的信息
public String readFromClient() {
try {
return bufferedReader.readLine();
} catch (Exception e) {
e.printStackTrace();
}
return null;
}

}

}

2. 创建一个Android程序

1) Layout

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:orientation="vertical"
tools:context=".MainActivity" >

<TextView
android:id="@+id/show"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="显示接收到服务器端数据" />

<Button
android:id="@+id/send"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="发送数据到服务器端" />

</LinearLayout>

2)ClientThread类

package com.example.testclient;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.net.SocketTimeoutException;

import android.os.Handler;
import android.os.Looper;
import android.os.Message;
import android.util.Log;

public class ClientThread implements Runnable {
private Socket s;
// 定义向UI线程发送消息的Handler对象
Handler handler;
// 定义接收UI线程的Handler对象
Handler revHandler;
// 该线程处理Socket所对用的输入输出流
BufferedReader br = null;
OutputStream os = null;

public ClientThread(Handler handler) {
this.handler = handler;
}

@Override
public void run() {
s = new Socket();
Log.d("111111111111", "@@@@@@@@@@@@@@@@@@@@");
try {
　　　　　　　　　　　　　　//192.168.0.26 为PC IP地址。

s.connect(new InetSocketAddress("192.168.0.26", 8888), 5000);
Log.d("111111111111", "$$");
br = new BufferedReader(new InputStreamReader(s.getInputStream()));
os = s.getOutputStream();

// 启动一条子线程来读取服务器相应的数据
new Thread() {

@Override
public void run() {
String content = null;
// 不断的读取Socket输入流的内容
try {
while ((content = br.readLine()) != null) {
// 每当读取到来自服务器的数据之后，发送的消息通知程序
// 界面显示该数据
Message msg = new Message();
msg.what = 0x123;
msg.obj =  content;
handler.sendMessage(msg);
Log.d("111111111111", content);
}
} catch (IOException io) {
io.printStackTrace();
}
}

}.start();
// 为当前线程初始化Looper
Looper.prepare();
// 创建revHandler对象
revHandler = new Handler() {

@Override
public void handleMessage(Message msg) {
// 接收到UI线程的中用户输入的数据
if (msg.what == 0x345) {
// 将用户在文本框输入的内容写入网络
try {
os.write(("Client" + msg.obj.toString() + "\r\n")
.getBytes("utf-8"));
} catch (Exception e) {
e.printStackTrace();
}
}
}

};
// 启动Looper
Looper.loop();

} catch (SocketTimeoutException e) {
Message msg = new Message();
msg.what = 0x123;
msg.obj = "网络连接超时！";
handler.sendMessage(msg);
}catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

}

}

3. MainActivity

public class MainActivity extends Activity {

Handler handler;
// 定义与服务器通信的子线程
ClientThread clientThread;
TextView show;
Button send;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

show = (TextView) this.findViewById(R.id.show);
send = (Button) this.findViewById(R.id.send);

send.setOnClickListener(new View.OnClickListener() {

@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
try {
// 当用户按下按钮之后，将用户输入的数据封装成Message
// 然后发送给子线程Handler
Message msg = new Message();
msg.what = 0x345;
msg.obj = "Android 网络编程--Socket通信编程";
clientThread.revHandler.sendMessage(msg);

} catch (Exception e) {
e.printStackTrace();
}
}
});
handler = new Handler() {
@Override
public void handleMessage(Message msg) {
// 如果消息来自子线程
if (msg.what == 0x123) {
// 将读取的内容追加显示在文本框中
show.append("\n" + msg.obj.toString());
show.setTextSize(50);
}
}
};
clientThread = new ClientThread(handler);
// 客户端启动ClientThread线程创建网络连接、读取来自服务器的数据
new Thread(clientThread).start();

}

}

参考：http://blog.csdn.net/thanksgining/article/details/43561053