android 初識socket通信--java程序做服務器

1.新建一個java工程做服務器

public class MyServer {
    String str ;
    public MyServer(){      
        try {
        //服務器端的聲明用serversocket，括號裏面寫端口號，端口號是自己指定的
            ServerSocket ss = new ServerSocket(4700);
            //accept方法在這裏會一直等待客戶端連接進來
            Socket accept = ss.accept();    
            //新建一個讀入流，字符集是utf-8
            BufferedReader br = new BufferedReader(new InputStreamReader(accept.getInputStream(),"utf-8")); 
            //用這個方法讀取客戶端寫入的數據
            str = br.readLine();
            System.out.println("從客戶端來的數據："+ str);
            br.close();
                } catch (IOException e) {
            e.printStackTrace();
        }       
    }
    public static void main(String [] args){
    //不要忘了這一步
        new MyServer();
    }
}

2.新建一個android工程作爲客戶端

public class MainActivity extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //這裏用到子線程有很多理由，可以自己百度瞭解一下
      new Thread(){
          public void run() {
              try {
              //cmd ipconfig獲取當前本機ip地址
                Socket client = new Socket("192.168.56.1", 4700);
                //一定要要以換行符結尾，不然readline會一直讀取不會停止，所以reaeline沒有值返回
                String str = "你好服務器\n";
                BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(client.getOutputStream()));
                bw.write(str);
                bw.flush();
                bw.close();
                } catch (UnknownHostException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
          }
      }.start();
    }