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  • Android网络编程Socket长连接

    在实际的应用中客户端可能需要和服务器端保持长时间的通信,即服务器需要不断地读取客户端数据,并向客户端写入数据;客户端也需要不断地读取服务器数据,并向服务器写入数据。

    简单实现代码如下:
     1 public class MyServer {
     2    //定义保存所有Socket的ArrayList
     3    public staticArrayList socketList = newArrayList();
     4   
     5    public static voidmain(String[] args) throws IOException {
     6       // TODOAuto-generated method stub
     7       ServerSocket ss = newServerSocket(30000);
     8       while(true){
     9          //此代码会阻塞,将一直等待别人连接
    10          Socket s = ss.accept();
    11          socketList.add(s);
    12          //每当客户端连接后启动一条ServerThread线程为该客户端服务
    13          new Thread(newServerThread(s)).start();
    14       }
    15    }
    16 }
    17 服务端通信线程
    18 public classServerThread implements Runnable {
    19    //定义当前线程所处理的Socket
    20    Socket s = null;
    21    //该线程所处理的Socket所对应的输入流
    22    BufferedReader br = null;
    23    public ServerThread(Socket s) throws IOException {
    24       this.s = s;
    25       //初始化该Socket对应的输入流
    26       br = newBufferedReader(new InputStreamReader(s.getInputStream(),
    27             "utf-8"));
    28    }
    29    @Override
    30    public void run() {
    31       // TODOAuto-generated method stub
    32       try
    33       {
    34          String content = null;
    35          //采用循环不断从Socket中读取客户端发送过来的数据
    36          while((content = readFromClient())!=null){
    37             //遍历socketList中的每个Socket
    38             //将读到的内容向每个Socket发送一次
    39             for(Socket s : MyServer.socketList){
    40                 OutputStream os = s.getOutputStream();
    41                 os.write((content + "
    ").getBytes("utf-8"));//注意发送消息的时候一定要加换行符,因为在readLine的时候看的就是换行符
    42             }
    43          }
    44       }catch(IOException e) {
    45          e.printStackTrace();
    46       }
    47    }
    48   
    49    public String readFromClient()
    50    {
    51       try{
    52          return br.readLine();
    53       }catch(IOException e){   //如果捕捉到异常,表明该Socket对应的客户端已经被关闭
    54          //删除该Socket
    55          MyServer.socketList.remove(s);
    56       }
    57       return null;
    58    }
    59 }
    public classMainActivity extends Activity {
       EditText input, show;
       Button send;
       OutputStream os;
       Handler handler;
       @Override
       protected voidonCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_main);
          input = (EditText) findViewById(R.id.input);
          send = (Button) findViewById(R.id.send);
          show = (EditText) findViewById(R.id.show);
          handler = new Handler() {
             public voidhandleMessage(android.os.Message msg) {
                if (msg.what == 0x123) {
                    show.append("
    " + msg.obj.toString());
                }
             };
          };
          newAsyncTask(){
             @Override
             protected String doInBackground(String... params) {
                // TODOAuto-generated method stub
                Socket s;
                try {
                    s = new Socket("192.168.1.75", 30000);
                    //客户端启动ClientThread线程,不断读取来自服务器的数据
                    new Thread(newClientThread(s, handler)).start();
                    os = s.getOutputStream();
                } catch(Exception e) {
                    e.printStackTrace();
                }
                return null;
             }
          }.execute("");
          send.setOnClickListener(newOnClickListener() {
             @Override
             public voidonClick(View v) {
                // TODOAuto-generated method stub
                try {
                    //将用户在文本框中输入的内容写入网络
                    os.write((input.getText().toString() + "
    ")
                          .getBytes("utf-8"));
                    input.setText("");
                } catch(IOException e) {
                    // TODOAuto-generated catch block
                    e.printStackTrace();
                }
             }
          });
       }
    }
    客户端通信线程
    public classClientThread implements Runnable {
       private Socket s;  //该线程负责处理的Socket
       private Handler handler;
       //该线程所处理的Socket对应的输入流
       BufferedReader br = null;
       public ClientThread(Socket s, Handler handler) throws IOException {
          this.s = s;
          this.handler = handler;
          br = newBufferedReader(new InputStreamReader(s.getInputStream()));
       }
       @Override
       public void run() {
          // TODOAuto-generated method stub
          try {
             String content = null;
             //不断读取Socket输入流中的内容
             while ((content = br.readLine()) != null) {
                //每当读到来自服务器的数据后,发送消息通知程序界面显示数据
                Message msg = newMessage();
                msg.what = 0x123;
                msg.obj = content;
                handler.sendMessage(msg);
             }
          } catch(Exception e) {
             e.printStackTrace();
          }
       }
    }

    原文地址:http://i.cnblogs.com/EditPosts.aspx?opt=1

    参考地址:

        android中对服务端的长连接【socket】

        http://blog.csdn.net/yaya_soft/article/details/11778593

          http://gavinwen.me/?post=2

        http://www.cnblogs.com/asi24/archive/2013/06/05/3119444.html

        http://coach.iteye.com/blog/2024444

        http://gstarwd.iteye.com/blog/619171

        

        Android学习笔记(七)之Android socket通信-解决中文乱码

        http://www.2cto.com/kf/201209/155337.html

        

     
     
     
     
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  • 原文地址:https://www.cnblogs.com/Miami/p/4277608.html
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