Socket的基本使用

川长思鸟来 2022-04-16 01:58 225阅读 0赞

## socket是什么 ##

套接字，可以用作传输之一，有TCP协议和UDP协议，其他自己百度。。。

## 服务端 ##

服务端一般采用多线程方式

public class SocketThread implements Runnable {
    
    	private Socket socket;
    
    	public SocketThread(Socket socket) {
    		this.socket = socket;
    	}
    
    	@Override
    	public void run() {
    		try {
    			/**
    			 * 1、socket的交互都是从输入输出流中获取
    			 * 	    你获取别人的请求从输入流中获取
    			 * 	    你需要响应给别人就写到输出流中
    			 */
    			//从输入流中拿到请求
    			InputStream inputStream = socket.getInputStream();
    			InputStreamReader reader = new InputStreamReader(inputStream);
    			BufferedReader bufferedReader = new BufferedReader(reader);
    			String message = "";
    			String temp = null;
    			while ((temp = bufferedReader.readLine()) != null) {
    				message = message + temp;
    			}
    			System.out.println("socket服务端接受到的消息为：" + message);
    
    			/**
    			 * 响应消息
    			 */
    			OutputStream outputStream = socket.getOutputStream();
    			PrintWriter printWriter = new PrintWriter(outputStream);
    			printWriter.println("请求成功");
    			printWriter.flush();
    			socket.shutdownOutput();
    
    			//以上所有开了的全部都要记得关闭
    			printWriter.close();
    			outputStream.close();
    			bufferedReader.close();
    			inputStream.close();
    			reader.close();
    			socket.close();
    		} catch (IOException e) {
    			e.printStackTrace();
    		}
    	}
    
    }

public class NetService {
    
    	public static void main(String[] args) {
    		
    		 try {
    			 //需要指定没用使用的端口号
    			ServerSocket serverSocket = new ServerSocket(12345);
    			System.out.println("服务端已启动");
    			//死循环，一直监听
    			while(true){
    				//开始监听所有传进来的
    				Socket socket = serverSocket.accept();
    				SocketThread socketThread = new SocketThread(socket);
    				new Thread(socketThread).start();;
    			}
    		} catch (IOException e) {
    			e.printStackTrace();
    		}
    		
    	}
    	
    }

客户端代码如下

public class SocketClient {
    	
    	public static void main(String[] args) {
    		try {
    			//IP+端口号
    			Socket socket = new Socket("127.0.0.1",12345);
    			OutputStream outputStream = socket.getOutputStream();
    			PrintWriter printWriter = new PrintWriter(outputStream);
    			printWriter.write("网贷核心请求报文：我是你大爷");
    			printWriter.flush();
    			socket.shutdownOutput();
    			
    			InputStream inputStream = socket.getInputStream();
    			InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
    			BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
    			String message = "";
    			String rsp = null;
    			while((rsp = bufferedReader.readLine()) != null){
    				message = message + rsp;
    			}
    			System.out.println("socketService响应报文:"+message);
    			
    			bufferedReader.close();
    			inputStreamReader.close();
    			inputStream.close();
    			printWriter.close();
    			outputStream.close();
    			socket.close();
    			
    		} catch (UnknownHostException e) {
    			e.printStackTrace();
    		} catch (IOException e) {
    			e.printStackTrace();
    		}
    	}
    }

这样就完成了简单的socket请求和响应