Spring 3 MVC - 调用 Controller 但未找到 View

Question

我正在尝试建立一个框架 Spring 3 MVC 项目，但我在渲染 View 时遇到困难。我遵循了 mvc-basic 示例项目和 http://blog.springsource.com/2009/12/21/mvc-simplifications-in-spring-3-0/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+Interface21TeamBlog+%28SpringSource+Team+Blog%29 中描述的结构。设置 web.xml、app-config.xml 和 mvc-config.xml 文件。 Controller 被调用，但当它到达找到 View 并渲染它的位置时，我收到404错误。文件如下:

web.xml:

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

    <!-- Handles all requests into the application -->
    <servlet>
        <servlet-name>myServlet</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>myServlet</servlet-name>
        <url-pattern>/app/*</url-pattern>
    </servlet-mapping>

</web-app>

app-config.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"
    xmlns:context="http://www.springframework.org/schema/context"
    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">

    <!-- Scans the classpath of this application for @Components to deploy as beans -->
    <context:component-scan base-package="com.myProject" />

    <!-- Application Message Bundle -->
    <bean id="messageSource" class="org.springframework.context.support.ReloadableResourceBundleMessageSource">
        <property name="basename" value="/WEB-INF/messages/messages" />
        <property name="cacheSeconds" value="0" />
    </bean>

    <!-- Configures Spring MVC -->
    <import resource="mvc-config.xml" />

</beans>

mvc-config.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"
    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/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">

    <!-- Configures the @Controller programming model -->
    <mvc:annotation-driven />

    <mvc:view-controller path="/app" view-name="welcome"/>

    <!-- Configures Handler Interceptors -->    
    <mvc:interceptors>
        <!-- Changes the locale when a 'locale' request parameter is sent; e.g. /?locale=de -->
        <bean class="org.springframework.web.servlet.i18n.LocaleChangeInterceptor" />
    </mvc:interceptors>

    <!-- Saves a locale change using a cookie -->
    <bean id="localeResolver" class="org.springframework.web.servlet.i18n.CookieLocaleResolver" />

    <!-- Resolves view names to protected .jsp resources within the /WEB-INF/views directory -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/views/"/>
        <property name="suffix" value=".jsp"/>
    </bean>

</beans>

在“Java Resources : src” -> com.myProject -> HelloWorldController.java 中，我有:

package com.myProject;

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

@Controller
@RequestMapping(value="/helloworld")
public class HelloWorldController {

    @RequestMapping(method=RequestMethod.GET)
    public ModelAndView helloWorld() {
        ModelAndView mav = new ModelAndView();
        mav.setViewName("helloworld");
        mav.addObject("message", "Hello World!");
        return mav;
    }

    @RequestMapping(value="/Second", method = RequestMethod.GET)
    public ModelAndView Second(){
        ModelAndView mav = new ModelAndView();
        mav.setViewName("Second");
        mav.addObject("message", "Hello World!");
        return mav;
    }
}

在WebContent/WEB-INF/views中我有:

WebContent              (folder)
  WEB-INF               (folder)
    views               (folder)
      helloworld        (folder)
        helloworld.jsp  (.jsp view)
      helloworld.jsp    (.jsp view)
      welcome.jsp       (.jsp view)

View 中有简单的 html。当我请求 http://localhost:8080/projectname/app 时，我正确地获取了 views ->welcome.jsp 页面。但是，当我请求 http://localhost:8080/projectname/app/helloworld 或 http://localhost:8080/projectname/app/helloworld/ 执行命中正确 Controller 操作，但我得到 HTTP Status 404 -/projectname/WEB-INF/views/helloworld.jsp

谁能告诉我哪里出了问题吗？

谢谢

Answer 1

有一些问题。第一个是您只在 web.xml 中将/app/* url 分派(dispatch)给 Spring:

<url-pattern>/app/*</url-pattern>

如果请求映射是/app/helloworld，那很好，但这意味着/helloworld甚至无法到达spring。您可能想要做的是使用 urlrewrite 过滤器将请求映射到/app/* 空间。

获取对 tuckey 的依赖，然后将其添加到您的 web.xml 中:

<filter>
    <filter-name>UrlRewriteFilter</filter-name>
    <filter-class>org.tuckey.web.filters.urlrewrite.UrlRewriteFilter</filter-class>
</filter>
<filter-mapping>
    <filter-name>UrlRewriteFilter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

然后在 WEB-INF 目录中添加一个名为 urlrewrite.xml 的文件，其中包含:

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE urlrewrite PUBLIC "-//tuckey.org//DTD UrlRewrite 3.0//EN" "http://tuckey.org/res/dtds/urlrewrite3.0.dtd">
<urlrewrite default-match-type="wildcard">
    <rule>
        <from>/images/**</from>
        <to>/images/$1</to>
    </rule>
    <rule>
        <from>/scripts/**</from>
        <to>/scripts/$1</to>
    </rule>
    <rule>
        <from>/styles/**</from>
        <to>/styles/$1</to>
    </rule>
    <rule>
        <from>/**</from>
        <to>/app/$1</to>
    </rule>
    <outbound-rule>
        <from>/app/**</from>
        <to>/$1</to>
    </outbound-rule>    
</urlrewrite>

之后，对/helloworld 的请求应该到达正确的位置。您可能也想更改 Root View Controller :

<mvc:view-controller path="/" view-name="welcome"/>