创建maven项目
创建项目，如下：
导入依赖
<dependencies>
<!--jsp-->
<dependency>
<groupId>javax.servlet.jsp</groupId>
<artifactId>jsp-api</artifactId>
<version>2.2</version>
</dependency>
<!--servlet-->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>4.0.1</version>
</dependency>
<!--使用EL表达式-->
<dependency>
<groupId>jstl</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
</dependencies>
创建Servlet类处理信息
重载doGet和doPost方法
为这个Servlet类在web.xml文件中注册
package com.dj;
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;
public class demo1 extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//1、读取视图传来的参数
System.out.println("访问页面--------");
String parameter = req.getParameter("method");
//2、业务处理
if (parameter.equals("add")) {
req.getSession().setAttribute("msg", "执行了add方法");
}
if (parameter.equals("delete")) {
req.getSession().setAttribute("msg", "执行了delete方法");
} else {
req.getSession().setAttribute("msg", "未找到执行方法");
}
//跳转
req.getRequestDispatcher("/WEB-INF/jsp/helloServlet.jsp").forward(req, resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
doGet(req, resp);
}
}
对web.xml中添加下面的代码
在下面的代码中设置了欢迎页面和超时时长（可以都不要）
<servlet>
<servlet-name>hello</servlet-name>
<servlet-class>com.zhl.demo01</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>hello</servlet-name>
<url-pattern>/hello</url-pattern>
</servlet-mapping>
<!-- 超时时长-->
<session-config>
<session-timeout>5</session-timeout>
</session-config>
<!-- 欢迎页面-->
<welcome-file-list>
<welcome-file>/WEB-INF/jsp/welcome.jsp</welcome-file>
</welcome-file-list>
jsp文件的创建
helloServlet.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
${msg}
</body>
</html>
welcome.jsp
<%--
Created by IntelliJ IDEA.
User: zycx.vm148
Date: 2021/7/26
Time: 14:06
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<h1>欢迎访问页面</h1>
</body>
</html>
配置Tomcat
解决tomcat中文乱码
运行代码
参考链接：https://blog.csdn.net/qq_26558047/article/details/112968630