android socket编程实例

学他人之长，补己之短。转自：http://blog.csdn.net/wuchuanpingstone/article/details/6617276

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

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <RelativeLayout 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     
 7     
 8 <Button
 9     android:id="@+id/connectbtn"
10     android:layout_width="wrap_content"
11     android:layout_height="wrap_content"
12     android:text="@string/connect"
13     android:gravity="center"
14     android:layout_alignRight="@+id/talkinget"
15     android:layout_alignParentRight="true" />
16 
17 <EditText
18     android:id="@id/talkinget"
19     android:layout_below="@id/connectbtn"
20     android:layout_width="fill_parent"
21     android:editable="false"
22     android:layout_height="200dip"
23     android:scrollHorizontally="true"
24     />
25 
26 
27 <Button
28     android:id="@+id/sendbtn"
29     android:layout_width="wrap_content"
30     android:layout_height="wrap_content"
31     android:layout_below="@id/talkinget"
32     android:layout_alignRight="@id/talkinget"
33     android:text="@string/send" 
34     />
35 
36 <EditText
37     android:id="@+id/inputet"
38     android:singleLine="true"
39     android:layout_below="@id/talkinget"
40     android:layout_toLeftOf="@id/sendbtn"
41     android:layout_alignBaseline="@id/sendbtn"
42     android:layout_width="fill_parent"
43     android:layout_height="wrap_content"
44     android:hint="@string/inputtip"
45 
46     />
47 </RelativeLayout>

下面是android客户端的源代码：

  1 package com.example.socketclientdemo;
  2 
  3 import android.os.Bundle;
  4 import android.app.Activity;
  5 import android.view.Menu;
  6 import java.io.BufferedReader;
  7 import java.io.BufferedWriter;
  8 import java.io.IOException;
  9 import java.io.InputStreamReader;
 10 import java.io.OutputStreamWriter;
 11 import java.io.PrintWriter;
 12 import java.net.Socket;
 13 import android.app.AlertDialog;
 14 import android.content.DialogInterface;
 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 
 21 public class SocketDemo extends Activity implements Runnable {
 22     private EditText tv_msg = null;
 23     private EditText ed_msg = null;
 24     private Button btn_send = null;
 25     private Button btn_con = null;
 26     
 27 //    private Button btn_login = null;
 28     private static final String HOST = "10.0.2.2";
 29     private static final int PORT = 9999;
 30     private Socket socket = null;
 31     private BufferedReader in = null;
 32     private PrintWriter out = null;
 33     private String content = "";
 34 
 35     /** Called when the activity is first created. */
 36     @Override
 37     public void onCreate(Bundle savedInstanceState) {
 38         super.onCreate(savedInstanceState);
 39         setContentView(R.layout.main);
 40 
 41         tv_msg = (EditText) findViewById(R.id.talkinget);
 42         ed_msg = (EditText) findViewById(R.id.inputet);
 43         btn_con = (Button) findViewById(R.id.connectbtn);
 44         btn_send = (Button) findViewById(R.id.sendbtn);
 45 
 46 //        try {
 47 //            socket = new Socket(HOST, PORT);
 48 //            in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
 49 //            out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(
 50 //                    socket.getOutputStream())), true);
 51 //        } catch (IOException ex) {
 52 //            ex.printStackTrace();
 53 //            ShowDialog("login exception" + ex.getMessage());
 54 //        }
 55         btn_send.setOnClickListener(new Button.OnClickListener() {
 56 
 57             @Override
 58             public void onClick(View v) {
 59                 // TODO Auto-generated method stub
 60                 String msg = ed_msg.getText().toString();
 61                 if (socket.isConnected()) {
 62                     if (!socket.isOutputShutdown()) {
 63                         out.println(msg);
 64                     }
 65                 }
 66             }
 67         });
 68         
 69         
 70         btn_con.setOnClickListener(new Button.OnClickListener() {
 71 
 72             @Override
 73             public void onClick(View v) {
 74                 // TODO Auto-generated method stub
 75                 new Thread(SocketDemo.this).start();
 76             }
 77         });
 78         
 79         
 80         //new Thread(SocketDemo.this).start();
 81     }
 82 
 83     public void ShowDialog(String msg) {
 84         new AlertDialog.Builder(this).setTitle("notification").setMessage(msg)
 85                 .setPositiveButton("ok", new DialogInterface.OnClickListener() {
 86 
 87                     @Override
 88                     public void onClick(DialogInterface dialog, int which) {
 89                         // TODO Auto-generated method stub
 90 
 91                     }
 92                 }).show();
 93     }
 94 
 95     public void run() {
 96         
 97         try {
 98             socket = new Socket(HOST, PORT);
 99             in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
100             out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(
101                     socket.getOutputStream())), true);
102         } catch (IOException ex) {
103             ex.printStackTrace();
104             ShowDialog("login exception" + ex.getMessage());
105         }
106         
107         try {
108             while (true) {
109                 if (socket.isConnected()) {
110                     if (!socket.isInputShutdown()) {
111                         if ((content = in.readLine()) != null) {
112                             content += "
";
113                             mHandler.sendMessage(mHandler.obtainMessage());
114                         } else {
115 
116                         }
117                     }
118                 }
119             }
120         } catch (Exception e) {
121             e.printStackTrace();
122         }
123     }
124 
125     public Handler mHandler = new Handler() {
126         public void handleMessage(Message msg) {
127             super.handleMessage(msg);
128             tv_msg.setText(tv_msg.getText().toString() + content);
129         }
130     };
131 
132     @Override
133     public boolean onCreateOptionsMenu(Menu menu) {
134         // Inflate the menu; this adds items to the action bar if it is present.
135         getMenuInflater().inflate(R.menu.socket_demo, menu);
136         return true;
137     }
138 
139 }

下面是服务器端得java代码：

 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>

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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原文地址：https://www.cnblogs.com/ning1121/p/3470028.html