狂神SpringMVC入门小bug

最新推荐文章于 2025-05-28 20:48:31 发布

悄悄的卷死他们

最新推荐文章于 2025-05-28 20:48:31 发布

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文章标签： servlet spring java

本文链接：https://blog.youkuaiyun.com/qq_56742368/article/details/126257495

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可能会出现的问题：404，代码没有出错的情况下

项目结构

HelloCController：

package com.kuang.controller;

import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.Controller;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class HelloController implements Controller {
    @Override
    public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) throws Exception {
        //ModelAndView
        ModelAndView mv = new ModelAndView();
        //封装对象
        mv.addObject("msg","HelloSpringMVC!");

        //封装要跳转的视图，放在ModeAndView
        mv.setViewName("hello");  //:  /WEB-INF/jsp/hello.jsp

        return mv;
    }
}

springmvc-servler.xml:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
    <bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping"/>
    <bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter"/>

    <!--视图解析器：DispatcherServlet给他们的ModerAndView-->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" id="internalResourceViewResolver">
        <!--前缀-->
        <property name="prefix" value="/WEB-INF/jsp/"/>
        <!--后缀-->
        <property name="suffix" value=".jsp"/>
    </bean>
    <!--Handler-->
    <bean id="/hello" class="com.kuang.controller.HelloController"/>


</beans>

hello.jsp:

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

web.xml:

<?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">
    <!--注册DispatcherServlet-->
    <servlet>
        <servlet-name>springmvc</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <!--关联一个springmvc的配置文件：【servlet-name】-servlet.xml-->
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:springmvc-servlet.xml</param-value>
        </init-param>
        <!--启动级别1-->
        <load-on-startup>1</load-on-startup>
    </servlet>

    <!--/匹配所有的请求-->
    <!--/* 匹配所有的请求-->
    <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
</web-app>

index.jsp:

<%--
  Created by IntelliJ IDEA.
  User: 张文
  Date: 2022/8/9
  Time: 22:02
  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>
  $END$
  </body>
</html>

有时候我们会出现404，但是代码没错，怎么解决呢，其实就是idea一个小bug，tomcat没有识别到jar包的感觉，解决：