Question

我试图用Spring MVC做一个简单的例子。每个代码对我来说似乎都没问题，但仍然有404错误。这是我的代码，请你帮我解释为什么我会收到此错误？

web.xml：

       <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
id="WebApp_ID" version="3.0">

<display-name>Demo</display-name>

<welcome-file-list>
    <welcome-file>hello.jsp</welcome-file>
</welcome-file-list>

<servlet>
    <servlet-name>Demo</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <load-on-startup>1</load-on-startup>
</servlet>

<servlet-mapping>
    <servlet-name>Demo</servlet-name>
    <url-pattern>/</url-pattern>
</servlet-mapping>

<listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>

<context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>/WEB-INF/Demo-servlet.xml</param-value>
</context-param>

Demo-servlet.xml（Dispatcher Servlet）：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="
    http://www.springframework.org/schema/beans     
    http://www.springframework.org/schema/beans/spring-beans.xsd
    http://www.springframework.org/schema/mvc 
    http://www.springframework.org/schema/mvc/spring-mvc.xsd
    http://www.springframework.org/schema/context 
    http://www.springframework.org/schema/context/spring-context.xsd ">

<mvc:annotation-driven />
<context:component-scan base-package="com.Demo" />

<bean
    class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    <property name="viewClass"
        value="org.springframework.web.servlet.view.JstlView" />
    <property name="prefix" value="/WEB-INF/" />
    <property name="suffix" value=".jsp" />
</bean>
</beans>

hello.jsp：

<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>

<html lang="en">
 <head>
 </head>
<body>
<h1>Gradle - Spring MVC Hello World</h1>
 <h2>Hello ${name}</h2>
 </body>
 </html>

HomeController.java：

 package com.Demo;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.ui.ModelMap;

@Controller
@RequestMapping("/")
public class HomeController{

@RequestMapping(method = RequestMethod.GET)
public String printHello(ModelMap model) {
   model.addAttribute("name", "Hello Spring MVC Framework!");
   return "hello";
 }
}

请帮我解决这个问题。提前致谢

Answer 1

将您的web.xml更改为：

<servlet-mapping>
    <servlet-name>Demo</servlet-name>
    <url-pattern>*.htm</url-pattern>
</servlet-mapping>

将您的控制器更改为：

@Controller
@RequestMapping("/demo")
public class HomeController

现在打开浏览器并使用以下命令调用Controller：//demo.htm

在开发期间，如果启用Spring调试日志，则会很好。至少直到你掌握了框架。它们提供有价值的信息

简单的Spring MVC项目面临404错误

1 个答案: