1.客户端传输到服务端

 

public void service() {     ServerSocket serverSocket = null;     InputStreamReader inputStreamReader = null;     try {         serverSocket = new ServerSocket(8899);         Socket accept = serverSocket.accept();         InputStream inputStream = accept.getInputStream();         inputStreamReader = new InputStreamReader(inputStream);         char[] cbuf = new char[5];         int len = 0;         while ( (len = inputStreamReader.read(cbuf))!=-1 ){             System.out.print(new String(cbuf, 0, len));         }     } catch (IOException e) {         e.printStackTrace();     } finally {         if (inputStreamReader != null) {             try {                 inputStreamReader.close();             } catch (IOException e) {                 e.printStackTrace();             }         }         if (serverSocket != null) {             try {                 serverSocket.close();             } catch (IOException e) {                 e.printStackTrace();             }         }     } } @Test public void client() {     Socket socket = null;     OutputStreamWriter outputStreamWriter = null;     try {         InetAddress localHost = InetAddress.getLocalHost();         socket = new Socket(localHost,8899);         OutputStream outputStream = socket.getOutputStream();         outputStreamWriter = new OutputStreamWriter(outputStream);         outputStreamWriter.write(你好，我是客户端);     } catch (IOException e) {         e.printStackTrace();     } finally {         if (outputStreamWriter != null) {             try {                 outputStreamWriter.close();             } catch (IOException e) {                 e.printStackTrace();             }         }         if (socket != null) {             try {                 socket.close();             } catch (IOException e) {                 e.printStackTrace();             }         }     } }