HttpServlet注解

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注解代替xml文件

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package com.xiaoguan.learn;

import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebInitParam;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;


import java.io.IOException;

@WebServlet(name="wstest",urlPatterns = {"/c","/d"},initParams = {@WebInitParam(name="1",value = "1"),@WebInitParam(name="xiaoguan",
        value = "520")},loadOnStartup = 1)
public class AServlet extends HttpServlet {
    public AServlet() {
        System.out.println("服务器启动");
    }

    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //System.out.println(this.getServletName());
        //System.out.println(request.getServletPath());
        //System.out.println(request.getContextPath());
        System.out.println(this.getInitParameter("xiaoguan"));

    }
}

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package com.xiaoguan.learn;

import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;

import java.io.IOException;
import java.io.PrintWriter;
@WebServlet("/e")
public class BServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        System.out.println(req.getServerName());
    }
}