TCP网络编程

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public class TCPTest {     @Test     public void client() {         Socket socket = null;         OutputStream os = null;         try {             //1.创建Socket对象，指明服务器端的ip和端口号             InetAddress inet = InetAddress.getByName("127.0.0.1");             socket = new Socket(inet, 8899);             //2.获取一个输出流，用于输出数据             os = socket.getOutputStream();             //3.写出数据的操作             os.write("hello哈哈哈".getBytes());         } catch (IOException e) {             e.printStackTrace();         } finally {             //4.资源关闭             if (os != null) {                 try {                     os.close();                 } catch (IOException e) {                     e.printStackTrace();                 }             }             if (socket != null) {                 try {                     socket.close();                 } catch (IOException e) {                     e.printStackTrace();                 }             }         }       }       @Test     public void server(){         ServerSocket serverSocket = null;         Socket socket = null;         InputStream is = null;         ByteArrayOutputStream baos = null;         try {             //1.创建服务器端的ServerSocket，指明自己的端口号             serverSocket = new ServerSocket(8899);             //调用accept()表示接收来自于客户端的socket             socket = serverSocket.accept();             //3.获取输入流             is = socket.getInputStream();             //4.读取输入流中的数据             baos = new ByteArrayOutputStream();             byte[] bcuf = new byte[5];             int len;             while ((len = is.read(bcuf)) != -1) {                 baos.write(bcuf, 0, len);             }             System.out.println(baos.toString());         } catch (IOException e) {             e.printStackTrace();         } finally {             if(baos!=null){                 try {                     baos.close();                 } catch (IOException e) {                     e.printStackTrace();                 }             }             if(baos!=null){                 try {                     is.close();                 } catch (IOException e) {                     e.printStackTrace();                 }             }             if(baos!=null){                 try {                     socket.close();                 } catch (IOException e) {                     e.printStackTrace();                 }             }             if(baos!=null){                 try {                     serverSocket.close();                 } catch (IOException e) {                     e.printStackTrace();                 }             }         }     } }

　　

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public class TCPTest2 {     @Test     public void client() throws IOException {         InetAddress inet = InetAddress.getByName("127.0.0.1");         Socket socket = new Socket(inet,8899);         OutputStream os = socket.getOutputStream();           File file = new File("hello.txt");         FileInputStream fis = new FileInputStream(file);         byte[] bytes = new byte[1024];         int len;         while ((len=fis.read(bytes))!=-1){             os.write(bytes,0,len);         }           socket.shutdownOutput();         fis.close();         os.close();         socket.close();       }       @Test     public void server() throws IOException {         FileOutputStream fos = new FileOutputStream("hello3.txt");         ServerSocket ss = new ServerSocket(8899);         Socket socket = ss.accept();           InputStream is = socket.getInputStream();         byte[] bytes = new byte[1024];         int len;         while ((len=is.read(bytes))!=-1){             fos.write(bytes,0,len);         }           is.close();         socket.close();         fos.close();     }   }