android socket通信

一、创建服务器的步骤

      1、指定端口实例化一个ServerSocket

           ServerSocket severSocket = new ServerSocket(54321);

      2、调用ServerSocket的accept()开始监听客户端的连接，并取得客户端的Socket对象client

           Socket client = severSocket.accept();

      3、获取位于底层Socket的流，以进行读写操作

           //接受客户端的消息
            InputStream is = client.getInputStream();
            InputStreamReader isr = new InputStreamReader(is);
            BufferedReader in = new BufferedReader(isr);     
            String str =  in.readLine();  

　　      //向客户端发送消息
            OutputStream os = client.getOutputStream();
            OutputStreamWriter osr = new OutputStreamWriter(os);
            BufferedWriter bw = new BufferedWriter(osr);
            PrintWriter out = new PrintWriter(bw,true);
            out.println("server message");
         

         4、关闭打开的流（注意：先关闭Writer，后关闭Reader）

           in.close();
           out.close();

二、创建客户端的步骤

      1、通过服务器的IP地址和端口实例化一个Socket，请求连接服务器

           socket = new Socket("ipdizhi",54321);

      2、获取Socket上的流进行读写操作，把流包装进BufferedReader/PrintWriter的实例；并对socket进行读写

      3、关闭流 

三、网络通信中的乱码问题

原因：通信过程中使用了不同的编码方式：服务器中的、传输过程中的，终端设备的

办法：getBytes("编码方式");//对汉字进行重编码，得到它的字节数组

        new String(Bytes[],"解码方式");//对字节数组进行相应的编码

实例：1、将流先转换为字节，再将字节按GB2312的方式转换得到字符串

         InputStream is = con.getInputStream();

         BufferedInputStream bis= new BufferedInputStream(is));

         byte a[] = new byte[1024];

         int currrent = -1;

         int i=0;

         while((currrent= bis.read())!=-1){

             byte a[i] = (byte)current;

             i++;

         }

         result = new String(a,"GB2312");

          2、在数据传递过程中使用ISO-8859-1字符集，在传递到终端设备时，将数据反转

          public static String FormotStr(String str){

              if(str==null||str=="") return "";

              try{

                     return new String(str.getBytes("ISO-8859-1"),"bgk");

               }catch (UnsupportedEncodingException e){

                     return str;

               }

          }

 以下附代码实例

public class Client extends Activity{
    private TextView mTextView = null;
    private EditText mEditText = null;
    private Button mButton = null;
    
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.socket);
        
        mTextView = (TextView)findViewById(R.id.textView1);  
        mEditText = (EditText)findViewById(R.id.editText1);  
        mButton = (Button)findViewById(R.id.button1);  
        
        mButton.setOnClickListener(new OnClickListener() {
            
            @Override
            public void onClick(View v) {
                Socket socket = null;
                String str = mEditText.getText().toString();
                try{
                    socket = new Socket("ipdizhi",54321);
                    //向服务器发送消息
                    OutputStream os = socket.getOutputStream();
                    OutputStreamWriter osr = new OutputStreamWriter(os);
                    BufferedWriter bw = new BufferedWriter(osr);
                    PrintWriter out = new PrintWriter(bw,true);
                    out.println(str);
                    
                    //接收来自服务器的消息
                    InputStream is = socket.getInputStream();
                    InputStreamReader isr = new InputStreamReader(is);
                    BufferedReader br = new BufferedReader(isr);
                    String msg = br.readLine();
                    if(msg!=null){
                        mTextView.setText(msg);
                    }else
                        mTextView.setText("数据错误");
                    
                    out.close();
                    br.close();
                    socket.close();                                                        
                }catch(Exception e){
                    Log.e("socket",e.getMessage()+"close");
                    e.printStackTrace();
                }
                
            }
        }); 
    }

}

public  class Server implements Runnable{

    @Override
    public void run() {
        System.out.println("run");
        try{
            ServerSocket severSocket = new ServerSocket(54321);
            System.out.println("severSocket");
            while(true){
                System.out.println("true");
                //接收客户端请求
                Socket client = severSocket.accept();
                System.out.println("accept");
                try{
                    //接受客户端消息
                    InputStream is = client.getInputStream();
                    InputStreamReader isr = new InputStreamReader(is);
                    BufferedReader in = new BufferedReader(isr);
                    
                    String str = in.readLine();                                        
                    System.out.println("read:"+str);
                    
                    /*System.out.println("请在键盘上输入你想输入的内容，输完后按回车结束:");
                    Scanner inn=new Scanner(System.in);
                    String strr=inn.next();
                    System.out.println("您刚才在键盘输入的信息是："+strr);*/

                    
                    //向客户端发送消息
                    OutputStream os = client.getOutputStream();
                    OutputStreamWriter osr = new OutputStreamWriter(os);
                    BufferedWriter bw = new BufferedWriter(osr);
                    PrintWriter out = new PrintWriter(bw,true);
                    //解决中文乱码
                    String strrr = "此处写服务器想发送给客户端的消";
                    byte a[] = new byte[1024];
                    a = strrr.getBytes(strrr);
                    String strend = new String(a,"gb2312");

                    out.println(strend);
                    
                    //关闭流
                    in.close();
                    out.close();    
                }catch(Exception e){
                    System.out.println(e.getMessage());
                    System.out.println("222");
                    e.printStackTrace();
                }
                finally{
                    client.close();
                    System.out.println("close");
                }
            }
        }catch(Exception e){
            System.out.println(e.getMessage());
            System.out.println("333");
        }
    }
//main函数，开启服务器
    public static void main(String a[]){
        Thread deskTopServerThread = new Thread(new Server());
        deskTopServerThread.start();                
    }
}