android socket 编程实例

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android客户端通过socket与服务器进行通信可以分为以下几步：

应用程序与服务器通信可以采用两种模式：TCP可靠通信和UDP不可靠通信。

（1）通过IP地址和端口实例化Socket，请求连接服务器：

socket = new Socket(HOST, PORT); //host:为服务器的IP地址 port：为服务器的端口号

（2）获取Socket流以进行读写，并把流包装进BufferWriter或者PrintWriter：

PrintWriterout=newPrintWriter(newBufferedWriter(newOutputStreamWriter(socket.getOutputStream())),true);

这里涉及了三个类：socket.getOutputStream得到socket的输出字节流，OutputStreamWriter是字节流向字符流转换的桥梁，BufferWriter是字符流，然后再包装进PrintWriter。

（3）对Socket进行读写

if (socket.isConnected()) {
if (!socket.isOutputShutdown()) {
out.println(msg);
}
}

（4）关闭打开的流

out.close();

在写代码的过程中一定要注意对socket 输入流输出流的关闭

下面是一个简单的例子：

main.xml

[html] view plain copy

<?xmlversion="1.0"encoding="utf-8"?>
<LinearLayoutxmlns: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"/>
<EditTextandroid:hint="content"
android:id="@+id/EditText01"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
</EditText>
<Button
android:text="send"
android:id="@+id/Button02"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
</Button>
</LinearLayout>

下面是android客户端的源代码：

package com.example.socketdemo;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.Socket;import android.annotation.SuppressLint;import android.annotation.TargetApi;import android.app.Activity;import android.app.AlertDialog;import android.content.DialogInterface;import android.os.Build;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.os.StrictMode;import android.view.View;import android.widget.Button;import android.widget.EditText;import android.widget.TextView;@TargetApi(Build.VERSION_CODES.GINGERBREAD)@SuppressLint("NewApi")public class SocketDemo extends Activity implements Runnable {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 = "192.168.1.223";private static final int PORT = 9999;private Socket socket = null;private BufferedReader in = null;private PrintWriter out = null;private String content = "";/** Called when the activity is first created. */@TargetApi(Build.VERSION_CODES.GINGERBREAD)@SuppressLint("NewApi")@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_socket_demo);////Android 2.3及以上调用严苛模式if (android.os.Build.VERSION.SDK_INT > 9) {StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();StrictMode.setThreadPolicy(policy);}tv_msg = (TextView) findViewById(R.id.TextView);ed_msg = (EditText) findViewById(R.id.EditText01);// btn_login = (Button) findViewById(R.id.Button01);btn_send = (Button) 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 (IOException ex) {ex.printStackTrace();ShowDialog("login exception" + ex.getMessage());}btn_send.setOnClickListener(new Button.OnClickListener() {public void onClick(View v) {// TODO Auto-generated method stubString msg = ed_msg.getText().toString();if (socket.isConnected()) {if (!socket.isOutputShutdown()) {out.println(msg);}}}});new Thread(SocketDemo.this).start();}public void ShowDialog(String msg) {new AlertDialog.Builder(this).setTitle("notification").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) {content += "\n";mHandler.sendMessage(mHandler.obtainMessage());} else {}}}}} catch (Exception e) {e.printStackTrace();}}public Handler mHandler = new Handler() {public void handleMessage(Message msg) {super.handleMessage(msg);tv_msg.setText(tv_msg.getText().toString() + content);}};}

下面是服务器端的java代码：

[java] view plain copy

importjava.io.BufferedReader;
importjava.io.BufferedWriter;
importjava.io.IOException;
importjava.io.InputStreamReader;
importjava.io.OutputStreamWriter;
importjava.io.PrintWriter;
importjava.net.ServerSocket;
importjava.net.Socket;
importjava.util.ArrayList;
importjava.util.List;
importjava.util.concurrent.ExecutorService;
importjava.util.concurrent.Executors;
publicclassMain{
privatestaticfinalintPORT=9999;
privateList<Socket>mList=newArrayList<Socket>();
privateServerSocketserver=null;
privateExecutorServicemExecutorService=null;//threadpool
publicstaticvoidmain(String[]args){
newMain();
}
publicMain(){
try{
server=newServerSocket(PORT);
mExecutorService=Executors.newCachedThreadPool();//createathreadpool
System.out.print("serverstart...");
Socketclient=null;
while(true){
client=server.accept();
mList.add(client);
mExecutorService.execute(newService(client));//startanewthreadtohandletheconnection
}
}catch(Exceptione){
e.printStackTrace();
}
}
classServiceimplementsRunnable{
privateSocketsocket;
privateBufferedReaderin=null;
privateStringmsg="";
publicService(Socketsocket){
this.socket=socket;
try{
in=newBufferedReader(newInputStreamReader(socket.getInputStream()));
msg="user"+this.socket.getInetAddress()+"cometoal:"
+mList.size();
this.sendmsg();
}catch(IOExceptione){
e.printStackTrace();
}
}
@Override
publicvoidrun(){
//TODOAuto-generatedmethodstub
try{
while(true){
if((msg=in.readLine())!=null){
if(msg.equals("exit")){
System.out.println("ssssssss");
mList.remove(socket);
in.close();
msg="user:"+socket.getInetAddress()
+"exittotal:"+mList.size();
socket.close();
this.sendmsg();
break;
}else{
msg=socket.getInetAddress()+":"+msg;
this.sendmsg();
}
}
}
}catch(Exceptione){
e.printStackTrace();
}
}
publicvoidsendmsg(){
System.out.println(msg);
intnum=mList.size();
for(intindex=0;index<num;index++){
SocketmSocket=mList.get(index);
PrintWriterpout=null;
try{
pout=newPrintWriter(newBufferedWriter(
newOutputStreamWriter(mSocket.getOutputStream())),true);
pout.println(msg);
}catch(IOExceptione){
e.printStackTrace();
}
}
}
}
}

注意在AndroidManifest.xml中加入对网络的访问权限

<uses-permission android:name="android.permission.INTERNET"></uses-permission>

在写代码的过程中一定要注意对套接字和输入/输出流的关闭

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