SpringMVC之回顾servlet

1、新建一个maven工程当作父工程，导入pom依赖

 <!-- 导入依赖   -->
    <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>

2、建立一个moudle块，springmvc–servlet，添加web app 支持如下图：
在这里插入图片描述

3、编写一个servlet类做测试

public class HelloController extends HttpServlet {
    @Override
    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
       //获取参数
        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");

        }
        //视图跳转
        req.getRequestDispatcher("/WEB-INF/jsp/hello.jsp").forward(req,resp);
    }
}

4、在WEB-INF下建立jsp文件夹，jsp文件夹中建立hello。jsp文件

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
${msg}
</body>
</html>

5、在web.xml中注册servlet

<?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>HelloServlet</servlet-name>
        <servlet-class>com.tqq.Comtroller.HelloController</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>HelloServlet</servlet-name>
        <url-pattern>/user</url-pattern>
    </servlet-mapping>
</web-app>

6、将项目部署tomcat中，这时候最好把引入的包导入以下，如图：
在这里插入图片描述

鸣谢：秦疆老师本博文参考秦老师的视频教程和公众号，真心为大家推荐秦老师，大家可以在b站上关注狂神说Java和关注公众号：狂神说，来学习秦老师更多的课程，大家一起进步。

SpringMVC之回顾servlet

猜你喜欢