<!-- 依赖 --> <dependencies> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.12</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>5.1.9.RELEASE</version> </dependency> <dependency> <groupId>javax.servlet</groupId> <artifactId>servlet-api</artifactId> <version>2.5</version> </dependency> <dependency> <groupId>javax.servlet.jsp</groupId> <artifactId>jsp-api</artifactId> <version>2.2</version> </dependency> <dependency> <groupId>javax.servlet</groupId> <artifactId>jstl</artifactId> <version>1.2</version> </dependency> </dependencies>
<dependency> <groupId>javax.servlet</groupId> <artifactId>servlet-api</artifactId> <version>2.5</version> </dependency> <dependency> <groupId>javax.servlet.jsp</groupId> <artifactId>jsp-api</artifactId> <version>2.2</version> </dependency>
package com.min.servlet; public class HelloServlet extends HttpServlet { @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { //1.获取前端参数 String method = req.getParameter("method"); if (method.equals("add")) { req.getSession().setAttribute("msg", "执行了add方法"); } if (method.equals("delete")) { req.getSession().setAttribute("msg", "执行了delete方法"); } //2.调用业务层 //3.视图转发或重定向 req.getRequestDispatcher("/WEB-INF/jsp/test.jsp").forward(req,resp); //resp.sendRedirect(); //重定向 } @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { doGet(req,resp); } }
<%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>hello!</title> </head> <body> ${msg} </body> </html>
<?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>hello</servlet-name> <servlet-class>com.min.servlet.HelloServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>hello</servlet-name> <url-pattern>/hello</url-pattern> </servlet-mapping> <!-- <session-config> <session-timeout>15</session-timeout> </session-config>--> <!-- <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list>--> </web-app>
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localhost:8080/hello?method=add
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localhost:8080/hello?method=delete
MVC框架要做哪些事情
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将url映射到java类或java类的方法 .
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封装用户提交的数据 .
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处理请求--调用相关的业务处理--封装响应数据 .
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将响应的数据进行渲染 . jsp / html 等表示层数据 .
说明：
常见的服务器端MVC框架有：Struts、Spring MVC、ASP.NET MVC、Zend Framework、JSF；常见前端MVC框架：vue、angularjs、react、backbone；由MVC演化出了另外一些模式如：MVP、MVVM 等等....