android socket编程实例

原创
2014/08/25 09:46
阅读数 721

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:

   PrintWriter out = new PrintWriter( new BufferedWriter( new OutputStreamWriter(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 plaincopy

  1. <?xml version="1.0" encoding="utf-8"?>  

  2. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    

  3.     android:orientation="vertical"   

  4.     android:layout_width="fill_parent"    

  5.     android:layout_height="fill_parent">    

  6.     <TextView   

  7.         android:id="@+id/TextView"   

  8.         android:singleLine="false"    

  9.         android:layout_width="fill_parent"    

  10.         android:layout_height="wrap_content" />    

  11.     <EditText android:hint="content"   

  12.         android:id="@+id/EditText01"    

  13.         android:layout_width="fill_parent"    

  14.         android:layout_height="wrap_content">    

  15.     </EditText>    

  16.     <Button   

  17.         android:text="send"   

  18.         android:id="@+id/Button02"    

  19.         android:layout_width="fill_parent"    

  20.         android:layout_height="wrap_content">    

  21.     </Button>    

  22. </LinearLayout>   

下面是android客户端的源代码:

[java] view plaincopy

  1. package com.android.SocketDemo;  

  2.   

  3. import java.io.BufferedReader;  

  4. import java.io.BufferedWriter;  

  5. import java.io.IOException;  

  6. import java.io.InputStreamReader;  

  7. import java.io.OutputStreamWriter;  

  8. import java.io.PrintWriter;  

  9. import java.net.Socket;  

  10.   

  11. import android.app.Activity;  

  12. import android.app.AlertDialog;  

  13. import android.content.DialogInterface;  

  14. import android.os.Bundle;  

  15. import android.os.Handler;  

  16. import android.os.Message;  

  17. import android.view.View;  

  18. import android.widget.Button;  

  19. import android.widget.EditText;  

  20. import android.widget.TextView;  

  21.   

  22. public class SocketDemo extends Activity implements Runnable {  

  23.     private TextView tv_msg = null;  

  24.     private EditText ed_msg = null;  

  25.     private Button btn_send = null;  

  26. //    private Button btn_login = null;  

  27.     private static final String HOST = "192.168.1.223";  

  28.     private static final int PORT = 9999;  

  29.     private Socket socket = null;  

  30.     private BufferedReader in = null;  

  31.     private PrintWriter out = null;  

  32.     private String content = "";  

  33.   

  34.     /** Called when the activity is first created. */  

  35.     @Override  

  36.     public void onCreate(Bundle savedInstanceState) {  

  37.         super.onCreate(savedInstanceState);  

  38.         setContentView(R.layout.main);  

  39.   

  40.         tv_msg = (TextView) findViewById(R.id.TextView);  

  41.         ed_msg = (EditText) findViewById(R.id.EditText01);  

  42. //        btn_login = (Button) findViewById(R.id.Button01);  

  43.         btn_send = (Button) findViewById(R.id.Button02);  

  44.   

  45.         try {  

  46.             socket = new Socket(HOST, PORT);  

  47.             in = new BufferedReader(new InputStreamReader(socket.getInputStream()));  

  48.             out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(  

  49.                     socket.getOutputStream())), true);  

  50.         } catch (IOException ex) {  

  51.             ex.printStackTrace();  

  52.             ShowDialog("login exception" + ex.getMessage());  

  53.         }  

  54.         btn_send.setOnClickListener(new Button.OnClickListener() {  

  55.   

  56.             @Override  

  57.             public void onClick(View v) {  

  58.                 // TODO Auto-generated method stub  

  59.                 String msg = ed_msg.getText().toString();  

  60.                 if (socket.isConnected()) {  

  61.                     if (!socket.isOutputShutdown()) {  

  62.                         out.println(msg);  

  63.                     }  

  64.                 }  

  65.             }  

  66.         });  

  67.         new Thread(SocketDemo.this).start();  

  68.     }  

  69.   

  70.     public void ShowDialog(String msg) {  

  71.         new AlertDialog.Builder(this).setTitle("notification").setMessage(msg)  

  72.                 .setPositiveButton("ok"new DialogInterface.OnClickListener() {  

  73.   

  74.                     @Override  

  75.                     public void onClick(DialogInterface dialog, int which) {  

  76.                         // TODO Auto-generated method stub  

  77.   

  78.                     }  

  79.                 }).show();  

  80.     }  

  81.   

  82.     public void run() {  

  83.         try {  

  84.             while (true) {  

  85.                 if (socket.isConnected()) {  

  86.                     if (!socket.isInputShutdown()) {  

  87.                         if ((content = in.readLine()) != null) {  

  88.                             content += "\n";  

  89.                             mHandler.sendMessage(mHandler.obtainMessage());  

  90.                         } else {  

  91.   

  92.                         }  

  93.                     }  

  94.                 }  

  95.             }  

  96.         } catch (Exception e) {  

  97.             e.printStackTrace();  

  98.         }  

  99.     }  

  100.   

  101.     public Handler mHandler = new Handler() {  

  102.         public void handleMessage(Message msg) {  

  103.             super.handleMessage(msg);  

  104.             tv_msg.setText(tv_msg.getText().toString() + content);  

  105.         }  

  106.     };  

  107. }  


下面是服务器端得java代码:

[java] view plaincopy

  1. import java.io.BufferedReader;  

  2. import java.io.BufferedWriter;  

  3. import java.io.IOException;  

  4. import java.io.InputStreamReader;  

  5. import java.io.OutputStreamWriter;  

  6. import java.io.PrintWriter;  

  7. import java.net.ServerSocket;  

  8. import java.net.Socket;  

  9. import java.util.ArrayList;  

  10. import java.util.List;  

  11. import java.util.concurrent.ExecutorService;  

  12. import java.util.concurrent.Executors;  

  13.   

  14.   

  15. public class Main {  

  16.     private static final int PORT = 9999;  

  17.     private List<Socket> mList = new ArrayList<Socket>();  

  18.     private ServerSocket server = null;  

  19.     private ExecutorService mExecutorService = null//thread pool  

  20.       

  21.     public static void main(String[] args) {  

  22.         new Main();  

  23.     }  

  24.     public Main() {  

  25.         try {  

  26.             server = new ServerSocket(PORT);  

  27.             mExecutorService = Executors.newCachedThreadPool();  //create a thread pool  

  28.             System.out.print("server start ...");  

  29.             Socket client = null;  

  30.             while(true) {  

  31.                 client = server.accept();  

  32.                 mList.add(client);  

  33.                 mExecutorService.execute(new Service(client)); //start a new thread to handle the connection  

  34.             }  

  35.         }catch (Exception e) {  

  36.             e.printStackTrace();  

  37.         }  

  38.     }  

  39.     class Service implements Runnable {  

  40.             private Socket socket;  

  41.             private BufferedReader in = null;  

  42.             private String msg = "";  

  43.               

  44.             public Service(Socket socket) {  

  45.                 this.socket = socket;  

  46.                 try {  

  47.                     in = new BufferedReader(new InputStreamReader(socket.getInputStream()));  

  48.                     msg = "user" +this.socket.getInetAddress() + "come toal:"  

  49.                         +mList.size();  

  50.                     this.sendmsg();  

  51.                 } catch (IOException e) {  

  52.                     e.printStackTrace();  

  53.                 }  

  54.                   

  55.             }  

  56.   

  57.             @Override  

  58.             public void run() {  

  59.                 // TODO Auto-generated method stub  

  60.                 try {  

  61.                     while(true) {  

  62.                         if((msg = in.readLine())!= null) {  

  63.                             if(msg.equals("exit")) {  

  64.                                 System.out.println("ssssssss");  

  65.                                 mList.remove(socket);  

  66.                                 in.close();  

  67.                                 msg = "user:" + socket.getInetAddress()  

  68.                                     + "exit total:" + mList.size();  

  69.                                 socket.close();  

  70.                                 this.sendmsg();  

  71.                                 break;  

  72.                             } else {  

  73.                                 msg = socket.getInetAddress() + ":" + msg;  

  74.                                 this.sendmsg();  

  75.                             }  

  76.                         }  

  77.                     }  

  78.                 } catch (Exception e) {  

  79.                     e.printStackTrace();  

  80.                 }  

  81.             }  

  82.             

  83.            public void sendmsg() {  

  84.                System.out.println(msg);  

  85.                int num =mList.size();  

  86.                for (int index = 0; index < num; index ++) {  

  87.                    Socket mSocket = mList.get(index);  

  88.                    PrintWriter pout = null;  

  89.                    try {  

  90.                        pout = new PrintWriter(new BufferedWriter(  

  91.                                new OutputStreamWriter(mSocket.getOutputStream())),true);  

  92.                        pout.println(msg);  

  93.                    }catch (IOException e) {  

  94.                        e.printStackTrace();  

  95.                    }  

  96.                }  

  97.            }  

  98.         }      

  99. }  


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>


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博主,在真机测试过吗?关于Socket块
2018/03/29 11:10
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