Socket通信——Android手机客户端和电脑服务器通信小例子

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前提：电脑端当做服务器，Android手机作为客户端，在同一个局域网内

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package TestSocket;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.*;

import javax.net.ssl.SSLContext;

public class TcpServer {

/**
* 电脑服务器端，监听端口号9998,接收消息之后，再回复消息
*
* @param args
* @throws IOException
*/
public static void main(String[] args) throws IOException {
while (true) {
ServerSocket ss = new ServerSocket(9998);// 监听9998端口
Socket socket = ss.accept();
//等待客户端连上，并等待接收数据
DataInputStream dis = new DataInputStream(socket.getInputStream());
System.out.println(dis.readUTF()); //打印出客户端发来的数据
//回复消息给客户端
DataOutputStream dos = new DataOutputStream(socket.getOutputStream());
dos.writeUTF("您好，客户端！");
ss.close();//通信完之后要关闭，不然下次会报错
dos.close();
dis.close();
}
}

}

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< RelativeLayout xmlns:android ="http://schemas.android.com/apk/res/android"
xmlns:tools ="http://schemas.android.com/tools"
android:layout_width ="fill_parent"
android:layout_height ="fill_parent" >

<TextView
android:id ="@+id/tv"
android:layout_width ="wrap_content"
android:layout_height ="wrap_content"
android:layout_centerHorizontal ="true"
android:layout_centerVertical ="true"
android:text ="@string/hello_world"
/>

<Button
android:id ="@+id/btnconnect"
android:layout_width ="wrap_content"
android:layout_height ="wrap_content"
android:text = "连接服务器" />

</ RelativeLayout>

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package com.example.socketclient;

import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.os.Message;
import android.app.Activity;
import android.content.DialogInterface;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Menu;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.*;

public class MainActivity extends Activity {
TextView tv;// 用来显示服务器返回的消息 ：“您好，客户端！”
Handler mHandler;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button btn = (Button) findViewById(R.id.btnconnect);// 连接服务器的按钮
btn.setOnClickListener(listener);
tv = (TextView) findViewById(R.id.tv);
mHandler = new MessageHandler();
}

OnClickListener listener = new OnClickListener() {

@Override
public void onClick(View v) {
new ReceiveMessageThread().start();// 开启客户端线程
}
};

/**
* 异步操作，TextView显示服务器发来的消息
*
* @author S.Rain
*
*/
class MessageHandler extends Handler {

@Override
public void handleMessage(Message msg) {
tv.setText(msg.obj.toString());//接收客户端线程发来的Message对象，用来显示
}

}

/**
* 客户端线程。连到服务器：192.168.1.102:9998 发送消息，之后接收服务器消息，并在TextView显示
*
* @author S.Rain
*
*/
class ReceiveMessageThread extends Thread {

public void run() {
try {
Socket socket = new Socket("192.168.1.102", 9998);
DataOutputStream dos = new DataOutputStream(
socket.getOutputStream());
dos.writeUTF("您好，服务器！");

DataInputStream dis = new DataInputStream(
socket.getInputStream());
Message msg = mHandler.obtainMessage();
msg.obj = dis.readUTF();
mHandler.sendMessage(msg);
socket.close();
dos.close();
dis.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

}
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {// 没用，工程创建时自己生成的
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}