使用IDEA创建Servlet程序的详细步骤

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
/**
 * 简述：
 *
 * @author:LiYansheng
 * @date:2021/08/11 22:56
 * @version:
 */
@WebServlet(name = "DemoServlet")
public class DemoServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    }
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //设置网页响应类型
        response.setContentType("text/html");
        response.getWriter().println("my first servlet code");
    }
}

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
         version="4.0">
    <servlet>
        <servlet-name>DemoServlet</servlet-name>
        <servlet-class>DemoServlet</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>DemoServlet</servlet-name>
        <url-pattern>/demo</url-pattern>
    </servlet-mapping>
</web-app>