网络编程.ServerSocket与Socket通信

0.服务端

public class NBServer {

	public static void main(String[] args) {
		doServer();
	}
	/**
	 * 服务端监听
	 */
	public static void doServer() {
		ServerSocket server = null;
		Socket socket = null;
		InputStream is = null;
		OutputStream os = null;
		try {
			server = new ServerSocket(6666);
			while ((socket = server.accept()) != null) {
				is = socket.getInputStream();
				byte[] by = new byte[1024];
				int len = 0;
				while ((len = is.read(by)) != -1) {//is.read(by)最多读取by的长度，第二循环从下标0覆盖再读
					System.out.println(new String(by, 0, len));//所以每次从0到len为有效数据
				}
				socket.shutdownInput();// 单方向的关闭流  连接并未关闭

				os = socket.getOutputStream();
				os.write("ok ig nb".getBytes());
				os.flush();// 刷新立即输出
				socket.shutdownOutput();// 单方向的关闭流
			 }
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			close(os);
			close(is, socket);//is.close()或者os.close()，会直接关闭socket
			close(server);
		}
		
	}
	/**
	 * 关闭ServerSocket
	 */
	public static void close(ServerSocket server) {
		if (server != null) {
			try {
				server.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	}
	/**
	 * 关闭输入
	 */
	public static void close(InputStream is) {
		if (is != null) {
			try {
				is.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	}
	/**
	 * 关闭输出
	 */
	public static void close(OutputStream os) {
		if (os != null) {
			try {
				os.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	}
	/**
	 * 关闭资源
	 */
	public static void close(InputStream is, Socket socket) {
		close(is);
		if (socket != null) {
			try {
				socket.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	}
}

1.客户端

public class NBClient {

	public static void main(String[] args) {
		doClient();
	}
	/**
	 * 客户端发送
	 */
	public static void doClient() {
		InputStream is = null;
		OutputStream os = null;
		Socket socket = null;
		try {
			socket = new Socket("localhost", 6666);//获取ip对应socket
			os = socket.getOutputStream();
			os.write("out stream".getBytes());
			os.flush();
			socket.shutdownOutput();// 单方向的关闭流
			
			is = socket.getInputStream();//读取流
			byte[] by = new byte[1024];
			int len = 0;
			while((len = is.read(by)) !=  -1) {
				System.out.println(new String(by, 0, len));
			}
		} catch (Exception e) {
			e.printStackTrace();
		}  finally {
			NBServer.close(is, os, socket);
		}
	}
	
}