Android网络编程之Socket方式连接

Socket连接方式需要编写服务器端和客户端的程序

服务器端：

实例化一个ServerSocket并赋予端口号 ---> 实例化一个客户端Socket ---> 循环等待客户端socket连接 ---> 取得客户端socket的输入流读取数据 ---> 取得输出流应答客户端

 

public class Server {
       
        private static boolean flag = true;
       
        public static void main(String[] args) {
              ServerSocket serverSocket =
null;
               try {
                      // 启动一个ServerSocket
                     serverSocket = new ServerSocket(9999);
                     Socket client = null;
                      while (flag) {
                           client = serverSocket.accept(); // 接受客户端请求
                            if (client.isConnected()) {
                                  System. out.println("connected!" ); 
                           }
                            // 取得输入流读取客户端传送的数据,要接收中文只需将编码设置为" gbk"
                           
                           BufferedReader br = new BufferedReader(new InputStreamReader(client.getInputStream(), "gbk" ));
       
                           StringBuffer buffer = new StringBuffer();
                           buffer.append( "Android:");
                           buffer.append(br.readLine());
       
                            // 取得输出流向客户端返回应答数据, 编码要与输入流匹配
                           PrintStream out = new PrintStream(client.getOutputStream(), true, "gbk");
       System. out.println(buffer);
                           out.println(buffer);
                           
                            // 关掉所有
                           br.close();
                           out.close();
                     }
                     client.close();
                     serverSocket.close();
                     
              } catch (IOException e) {
                     e.printStackTrace();
              }
       }
}

 客户端：

 

实例化一个Socket并传入服务器端IP与端口号 ---> 取得客户端输出流发出数据给客户端 ---> 取得客户端输入流接受服务器应答数据 ---> 处理数据

Activity准备组件部分：

public class MainActivity extends Activity {

        private EditText enterInfoText = null;
        private TextView socketText = null;
        private Button connectBtn = null;
       
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout. activity_main);
       
        /*下面两段代码使Android3.0以上系统可以让 http代码使用主UI线程,因为3.0以上系统对UI资源的使用更严格*/
        StrictMode. setThreadPolicy(new StrictMode.ThreadPolicy.Builder() 
        .detectDiskReads().detectDiskWrites().detectNetwork() 
        .penaltyLog().build()); 

        StrictMode. setVmPolicy(new StrictMode.VmPolicy.Builder()
        .detectLeakedSqlLiteObjects().penaltyLog()
        .penaltyDeath().build()); 
       
        enterInfoText = (EditText) findViewById(R.id.enterInfoText);
        socketText = (TextView) findViewById(R.id.socketText);
        connectBtn = (Button) findViewById(R.id.connectBtn);
       
        connectBtn.setOnClickListener(new ConnectionBtnListener()); 
    }

按钮监听方法实现socket连接服务器端：

 private class ConnectionBtnListener implements OnClickListener {

               @Override
               public void onClick(View v) {
                      try {
                           String temp = MainActivity.this .enterInfoText.getText().toString();
                            if (temp == null || temp == "") {
                                  MainActivity. this.socketText .setText("请输入内容！");
                                   return;
                           }
                            //准备向服务器端发送信息的socket
                           Socket client = new Socket("172.16.1.210" , 9999);
                           
                            // 准备向服务器传数据的PrintWriter, 要传送中文只需将编码设置为" gbk"
                           PrintStream out = new PrintStream(client.getOutputStream(), true, "gbk");
                           out.println(temp);
                           
                            // 准备从服务器端接收回应的BufferedReader, 编码要与输出流匹配
                           BufferedReader br = new BufferedReader(new InputStreamReader(client.getInputStream(), "gbk" ));
//System.out.println(br.readLine());
                           MainActivity. this.socketText .setText(br.readLine());
                           
                           br.close();
                           out.close();
                           client.close();
                     } catch (UnknownHostException e) {
                           e.printStackTrace();
                     } catch (IOException e) {
                           e.printStackTrace();
                     }
              }
       
    }

}