android socket程式設計例項

lostinai發表於2013-08-24
Android程式設計

http://blog.csdn.net/wuchuanpingstone/article/details/6617276

android客戶端通過socket與伺服器進行通訊可以分為以下幾步：

應用程式與伺服器通訊可以採用兩種模式：TCP可靠通訊 和UDP不可靠通訊。

（1）通過IP地址和埠例項化Socket，請求連線伺服器：

     socket = new Socket(HOST, PORT);   //host:為伺服器的IP地址  port：為伺服器的埠號

（2）獲取Socket流以進行讀寫，並把流包裝進BufferWriter或者PrintWriter：

   PrintWriter out = new PrintWriter( new BufferedWriter( new OutputStreamWriter(socket.getOutputStream())),true);  

   這裡涉及了三個類：socket.getOutputStream得到socket的輸出位元組流，OutputStreamWriter是位元組流向字元流轉換的橋樑，BufferWriter是字元流，然後再包裝進PrintWriter。

（3）對Socket進行讀寫

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

（4）關閉開啟的流

      out.close();

 在寫程式碼的過程中一定要注意對socket  輸入流  輸出流的關閉

 

下面是一個簡單的例子：

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客戶端的原始碼：

[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. }  


下面是伺服器端得java程式碼：

[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中加入對網路的訪問許可權

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

 

在寫程式碼的過程中一定要注意對套接字和輸入/輸出流的關閉



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