Question

我是初次使用mvc框架的新手，并按照 site 进行了hello world教程

错误：请求的资源不可用

的web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
id="WebApp_ID" version="2.5">
    <display-name>HelloWorldExampleWithSpring3MVCInEclipse</display-name>
    <servlet>
        <servlet-name>Spring MVC Dispatcher Servlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>
                /WEB-INF/app-config.xml
            </param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>Spring MVC Dispatcher Servlet</servlet-name>
        <url-pattern>*.htm</url-pattern>
    </servlet-mapping>

    <welcome-file-list>
        <welcome-file>index.jsp</welcome-file>
    </welcome-file-list>
</web-app>

应用-config.xml中

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="
http://www.springframework.org/schema/beans    http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">
    <!-- Scans the classpath of this application for @Components to deploy as beans -->
    <context:component-scan base-package="com.raistudies" />
    <!-- Configures the @Controller programming model -->
    <mvc:annotation-driven />
    <!-- Resolves view names to protected .jsp resources within the /WEB-INF/views directory -->
    <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/jsp/"/>
        <property name="suffix" value=".jsp"/>
    </bean>
</beans>

HelloWorldAction.java

package com.raistudies.actions;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;

@Controller
public class HelloWorldAction {

    @RequestMapping(value="/hello",method=RequestMethod.GET)
    public ModelAndView sayHello(Model model){
        ModelAndView mv = new ModelAndView();
        mv.setViewName("hello");
        model.addAttribute("HelloMessage", "Hello World from My First Spring 3 mvc application");
        return mv;
    }
}

的hello.jsp

<!DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN""http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<%@ page session="true" %>
<html xmlns="http://www.w3.org/1999/xhtml">
    <head>
        <title>Hello World with Spring 3 MVC</title>
    </head>
    <body>
        <h1>Welcome! Spring MVC is working well.</h1><br />
        ${HelloMessage}
    </body>
</html>

Answer 1

在 web.xml 中，当我们用“/”替换“* htm”时，则解决了资源不可用的错误。

Answer 2

原始问题是因为您将所有以*.htm结尾的请求发送到Spring：

<servlet-mapping>
    <servlet-name>Spring MVC Dispatcher Servlet</servlet-name>
    <url-pattern>*.htm</url-pattern>
</servlet-mapping>

但您的控制器已映射到/hello而没有扩展名。

将控制器中的@RequestMapping更改为：

@RequestMapping(value="/hello.htm",method=RequestMethod.GET)

Answer 3

如果您正在访问http://localhost:8080/HelloWorldExampleWithSpring3MVCInEclipse/，则需要在项目中创建WebContent / index.jsp以使此URL正常工作。

的index.jsp：

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
   pageEncoding="ISO-8859-1"%>
<jsp:forward page="/hello.htm"></jsp:forward>

请参阅示例代码here。

spring mvc framework hello world显示错误404

3 个答案: