android-------- socket 实现客户端与服务器端通信

前面介绍了Socket的简介和原理，今天简单的来实现一下客服端与服务器通信的功能

客服端

建立连接

 try {
        socket = new Socket("192.168.1.100", 9999);
        Log.i("Android", "与服务器建立连接：" + socket);
      } catch (UnknownHostException e) {
          e.printStackTrace();
      } catch (IOException e) {
          e.printStackTrace();
     }

发送消息

  try {
         // socket.getInputStream()
        DataOutputStream writer = new DataOutputStream(socket.getOutputStream());
        writer.writeUTF("嘿嘿，你好啊，服务器.."); // 写一个UTF-8的信息
        System.out.println("发送消息");
      } catch (IOException e) {
           e.printStackTrace();
      }

添加权限

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

服务端（在Eclipse建立一个Java项目即可）

import java.io.DataInputStream;
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;

public class SocketServer {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub

        System.out.println("123456");
        startService();
    }

    /**
    * 启动服务监听，等待客户端连接
    */
   private static void startService() {
       try {
           // 创建ServerSocket
           ServerSocket serverSocket = new ServerSocket(9999);
           System.out.println("--开启服务器，监听端口 9999--");  

           // 监听端口，等待客户端连接
           while (true) {
               System.out.println("--等待客户端连接--");
               Socket socket = serverSocket.accept(); //等待客户端连接
               System.out.println("得到客户端连接：" + socket);  

               startReader(socket);
           }  

       } catch (IOException e) {
           e.printStackTrace();
       }
   }  

   /**
    * 从参数的Socket里获取最新的消息
    */
   private static void startReader(final Socket socket) {  

       new Thread(){
           @Override
           public void run() {
               DataInputStream reader;
               try {
                   // 获取读取流
                   reader = new DataInputStream( socket.getInputStream());
                   while (true) {
                       System.out.println("*等待客户端输入*");
                       // 读取数据
                       String msg = reader.readUTF();
                       System.out.println("获取到客户端的信息：" + msg);
                   }
               } catch (IOException e) {
                   e.printStackTrace();
               }
           }
       }.start();
   }  

}

运行Java项目，得到

然后在手机端点击发送消息

服务端接收到消息，打印信息

服务端发送消息给客户端

服务端代码：

public class TestServer {

     public static void main(String[] args) {

         try {
            ServerSocket serverSocket = new ServerSocket(30000);
            System.out.println("服务器已连接");
            while(true){
                System.out.println("123");
                Socket socket = serverSocket.accept();
                OutputStream outputStream = socket.getOutputStream();
                outputStream.write("你好，我是服务器\n".getBytes("utf-8"));
                outputStream.close();
                socket.close();
            }
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

     }
}

客户端代码

public class Demo2Activity extends AppCompatActivity {

    static TextView textView;
    Socket socket;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.demo2);
        initView();
    }

    private void initView(){
        textView = (TextView) findViewById(R.id.txt_1);

        new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    socket = new Socket("192.168.1.101", 30000);
                    // socket.setSoTimeout(10000);//设置10秒超时
                    Log.i("Android", "与服务器建立连接：" + socket);
                    BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream()));
                    String line = br.readLine();
                    Log.i("Android", "与服务器建立连接：" + line);
                    Message msg = new Message();
                    msg.what = 1;
                    msg.obj = line;
                    handler.sendMessage(msg);
                } catch (UnknownHostException e) {
                    e.printStackTrace();
                } catch (IOException e) {
                    e.printStackTrace();
                }catch (Exception e){
                    e.printStackTrace();
                }
            }
        }).start();

    }

    Handler handler = new Handler(){
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            if (msg.what == 1){
                textView.setText("这是来自服务器的数据:"+msg.obj.toString());
            }
        }
    };

}

先运行服务端，再运行客户端

效果图：

源码包含多个demo，也是参考网上资料而来

源码地址：https://github.com/DickyQie/android-socket