android socket編程實例

android客戶端通過socket與服務器進行通信可以分爲以下幾步：

應用程序與服務器通信可以採用兩種模式：TCP可靠通信和UDP不可靠通信。

（1）通過IP地址和端口實例化Socket，請求連接服務器：

socket = new Socket(HOST, PORT); //host:爲服務器的IP地址 port：爲服務器的端口號

（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);

這裏涉及了三個類：socket.getOutputStream得到socket的輸出字節流，OutputStreamWriter是字節流向字符流轉換的橋樑，BufferWriter是字符流，然後再包裝進PrintWriter。

（3）對Socket進行讀寫

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

（4）關閉打開的流

out.close();

在寫代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 plain copy

<?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="send"    
        android:id="@+id/Button02"     
        android:layout_width="fill_parent"     
        android:layout_height="wrap_content">     
    </Button>     
</LinearLayout>

下面是android客戶端的源代碼：

[java] view plain copy

package com.android.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.app.Activity;   
import android.app.AlertDialog;   
import android.content.DialogInterface;   
import android.os.Bundle;   
import android.os.Handler;   
import android.os.Message;   
import android.view.View;   
import android.widget.Button;   
import android.widget.EditText;   
import android.widget.TextView;   
   
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. */   
    @Override   
    public void onCreate(Bundle savedInstanceState) {   
        super.onCreate(savedInstanceState);   
        setContentView(R.layout.main);   
   
        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() {   
   
            @Override   
            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(SocketDemo.this).start();   
    }   
   
    public void ShowDialog(String msg) {   
        new AlertDialog.Builder(this).setTitle("notification").setMessage(msg)   
                .setPositiveButton("ok", new DialogInterface.OnClickListener() {   
   
                    @Override   
                    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);   
        }   
    };   
}

下面是服務器端得java代碼：

[java] view plain copy

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;   
   
   
public class Main {   
    private static final int PORT = 9999;   
    private List<Socket> mList = new ArrayList<Socket>();   
    private ServerSocket server = null;   
    private ExecutorService mExecutorService = null; //thread pool   
       
    public static void main(String[] args) {   
        new Main();   
    }   
    public Main() {   
        try {   
            server = new ServerSocket(PORT);   
            mExecutorService = Executors.newCachedThreadPool();  //create a thread pool   
            System.out.print("server start ...");   
            Socket client = null;   
            while(true) {   
                client = server.accept();   
                mList.add(client);   
                mExecutorService.execute(new Service(client)); //start a new thread to handle the connection   
            }   
        }catch (Exception e) {   
            e.printStackTrace();   
        }   
    }   
    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 toal:"   
                        +mList.size();   
                    this.sendmsg();   
                } catch (IOException e) {   
                    e.printStackTrace();   
                }   
                   
            }   
   
            @Override   
            public void run() {   
                // TODO Auto-generated method stub   
                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()   
                                    + "exit total:" + mList.size();   
                                socket.close();   
                                this.sendmsg();   
                                break;   
                            } else {   
                                msg = socket.getInetAddress() + ":" + msg;   
                                this.sendmsg();   
                            }   
                        }   
                    }   
                } catch (Exception e) {   
                    e.printStackTrace();   
                }   
            }   
             
           public void sendmsg() {   
               System.out.println(msg);   
               int num =mList.size();   
               for (int index = 0; index < num; index ++) {   
                   Socket mSocket = mList.get(index);   
                   PrintWriter pout = null;   
                   try {   
                       pout = new PrintWriter(new BufferedWriter(   
                               new OutputStreamWriter(mSocket.getOutputStream())),true);   
                       pout.println(msg);   
                   }catch (IOException e) {   
                       e.printStackTrace();   
                   }   
               }   
           }   
        }       
}

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