java实现简单的客户端和服务端的通信

 java实现简单的客户端和服务端的通信。服务端和客户端均为本机

服务端 

    @Test
	public void server()  {
		ServerSocket ss = null;
		Socket socket = null;
		InputStream is = null;
		ByteArrayOutputStream baos = null;
		try {
			//1.创建服务器的ServerSocket，指明自己的端口号
			ss = new ServerSocket(8899);
			//2.调用accpet()接受客户点的Socket
			socket = ss.accept();
			//3.获得输入流
			is = socket.getInputStream();
			//4.读取输入流的数据
			baos = new ByteArrayOutputStream();
			byte buffer[]=new byte[5];
			int len;
			while((len=is.read(buffer))!=-1) {
				baos.write(buffer,0,len);
			}
			System.out.println(baos.toString());
			System.out.println("收到了来自于："+socket.getInetAddress().getHostAddress()+"的数据");
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}finally {
            //5.关闭资源
			if(ss!=null)
				try {
					ss.close();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			
			if(socket!=null)
				try {
					socket.close();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			if(is!=null)
				try {
					is.close();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			if(baos!=null)
				try {
					baos.close();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
		}
		
	}

 客户端：

    @Test
	public void client()  {
		InetAddress inet=null;
		Socket socket=null;
		OutputStream os=null;
		try {
			//1.创建Scoket对象指明服务器的ip号和端口号
			 inet=InetAddress.getByName("127.0.0.1");
			 socket=new Socket(inet,8899);
			 //2.获取输出流，用于输出数据
			 os=socket.getOutputStream();
			 //3.写出数据的操作
			os.write("你好，我是客户端飞舞的法拉克".getBytes());
		} catch (UnknownHostException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}finally {
			//4.资源的关闭
			if(os!=null)
				try {
					os.close();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			
			if(socket!=null)
				try {
					socket.close();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
		}
	}

启动时，要先启动服务端，然后启动客户端

 运行结果：