所谓socket通常也称作"套接字",应用程序通常通过"套接字"向网络发出请求或者应答网络请求。 以J2SDK-1.3为例,Socket和ServerSocket类库位于java .net包中。ServerSocket用于服务器端,Socket是建立网络连接时使用的。在连接成功时,应用程序两端都会产生一个Socket实例,操作这个实例,完成所需的会话。对于一个网络连接来说,套接字是平等的,并没有差别,不因为在服务器端或在客户端而产生不同级别。不管是Socket还是ServerSocket它们的工作都是通过SocketImpl类及其子类完成的。
好了我们看看在Android中如何使用Socket的。
Android中使用Socket模型
服务器端:
package com;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
/**
* com Server
*
* @author Aina.huang E-mail: 674023920@qq.com
* @version 创建时间:2010 Jul 14, 2010 10:45:35 AM 类说明
*/
public class Main {
private static final int PORT = 9999;// 端口监听
private List<Socket> mList = new ArrayList<Socket>();// 存放客户端socket
private ServerSocket server = null;
private ExecutorService mExecutorService = null;// 线程池
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
new Main();
}
public Main() {
try {
server = new ServerSocket(PORT);
mExecutorService = Executors.newCachedThreadPool();// 创建一个线程池
System.out.println("Server Start...");
Socket client = null;
while (true) {
client = server.accept();
mList.add(client);
mExecutorService.execute(new Service(client));// 开启一个客户端线程.
}
} catch (Exception ex) {
ex.printStackTrace();
}
}
public class Service implements Runnable {
private Socket socket;
private BufferedReader in = null;
private String msg = "";
public Service(Socket socket) {
this.socket = socket;
try {
in = new BufferedReader(new InputStreamReader(socket
.getInputStream()));
msg = "user:" + this.socket.getInetAddress() + " come total:"
+ mList.size();
this.sendmsg();
} catch (IOException e) {
e.printStackTrace();
}
}
public void run() {
// TODO Auto-generated method stub
try {
while (true) {
if ((msg = in.readLine()) != null) {
if (msg.equals("exit")) {
System.out.println("sssssssssss");
mList.remove(socket);
in.close();
msg = "user:" + socket.getInetAddress()
+ " exit total:" + mList.size();
socket.close();
this.sendmsg();
break;
} else {
msg = socket.getInetAddress() + " : " + msg;
this.sendmsg();
}
}
}
} catch (Exception ex) {
System.out.println("server 读取数据异常");
ex.printStackTrace();
}
}
/**
* 发送消息给所有客户端
*/
public void sendmsg() {
System.out.println(msg);
int num = mList.size();
for (int i = 0; i < num; i++) {
Socket mSocket = mList.get(i);
PrintWriter pout = null;
try {
pout = new PrintWriter(new BufferedWriter(
new OutputStreamWriter(mSocket.getOutputStream())),
true);
pout.println(msg);
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}
package com.Aina.Android;
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.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class Test extends Activity implements Runnable {
/** Called when the activity is first created. */
private TextView tv_msg = null;
private EditText ed_msg = null;
private Button btn_send = null;
private Button btn_login = null;
private static final String HOST = "192.168.0.132";
private static final int PORT = 9999;
private Socket socket = null;
private BufferedReader in = null;
private PrintWriter out = null;
private String content = "";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
tv_msg = (TextView) this.findViewById(R.id.TextView);
ed_msg = (EditText) this.findViewById(R.id.EditText01);
btn_login = (Button) this.findViewById(R.id.Button01);
btn_send = (Button) this.findViewById(R.id.Button02);
try {
socket = new Socket(HOST, PORT);
in = new BufferedReader(new InputStreamReader(socket
.getInputStream()));
out = new PrintWriter(new BufferedWriter(
new OutputStreamWriter(socket.getOutputStream())),
true);
} catch (Exception ex) {
ex.printStackTrace();
ShowDialog("登陆异常:" + ex.getMessage());
}
btn_send.setOnClickListener(new Button.OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
String msg = ed_msg.getText().toString();
if (socket.isConnected()) {
if (!socket.isOutputShutdown()) {
out.println(msg);
}
}
}
});
new Thread(this).start();
}
public void ShowDialog(String msg) {
new AlertDialog.Builder(this).setTitle("提示").setMessage(msg)
.setPositiveButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
}
}).show();
}
public void run() {
try {
while (true) {
if(socket.isConnected()){
if(!socket.isInputShutdown()){
if ((content = in.readLine()) != null) {
Log.i("TAG", "++ "+content);
content += "\n";
mHandler.sendMessage(mHandler.obtainMessage());
}else{
}
}
}
}
} catch (Exception ex) {
ex.printStackTrace();
}
}
public Handler mHandler = new Handler() {
public void handleMessage(Message msg) {
super.handleMessage(msg);
Log.i("TAG", "-- "+msg);
tv_msg.setText(tv_msg.getText().toString() + content);
}
};
}
<?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/TextView" android:singleLine="false"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
<EditText android:hint="content" android:id="@+id/EditText01"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
</EditText>
<Button android:text="login" android:id="@+id/Button01"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
</Button>
<Button android:text="send" android:id="@+id/Button02"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
</Button>
</LinearLayout>