java - 新的 ModelAndView 不起作用

Question

我正在尝试运行 springMVC 应用程序，但它向我显示空白页面。

在我的 Controller 类中，我有

@Controller
public class LoginController extends CommonController {

    @RequestMapping("/login")
        public ModelAndView login(HttpSession session, HttpServletResponse response, HttpServletRequest request, Model model) {
         logger.info("something"); // printing something in logs
         return new ModelAndView("login");//But failing here not loading login.jsp
    }
}

它进入登录方法，就好像我在返回其打印之前打印一些内容，但在返回语句时失败，并且我没有收到任何异常

在我的 spring-servlet.xml 中。我有

<?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:p="http://www.springframework.org/schema/p"
    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">

    <context:annotation-config />
    <context:component-scan base-package="com.jemmmedia.organise" />

    <!-- Enable annotation driven controllers, validation etc... -->
    <mvc:annotation-driven />

--------
-------

<bean class="org.springframework.web.servlet.view.json.MappingJacksonJsonView"
       p:prefixJson="true" />

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

我的login.jsp位于/core/src/main/webapp/WEB-INF/jsp/login.jsp

在 pom.xml 里面我有

<properties>
        <spring.version>3.0.7.RELEASE</spring.version>
    </properties>
<dependency>
            <groupId>org.springframework.security</groupId>
            <artifactId>spring-security-web</artifactId>
            <version>3.1.1.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.security</groupId>
            <artifactId>spring-security-config</artifactId>
            <version>3.1.1.RELEASE</version>
        </dependency>
        <!--spring -->

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
            <version>${spring.version}</version>
        </dependency>


        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>${spring.version}</version>
            <exclusions>
                <exclusion>
                    <groupId>org.springframework.security</groupId>
                    <artifactId>spring-security-web</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>org.springframework.security</groupId>
                    <artifactId>spring-security-config</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aspects</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjrt</artifactId>
            <version>1.7.2</version>
        </dependency>
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.7.2</version>
        </dependency>

我的 web.xml 文件

<?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_3_0.xsd"
    id="WebApp_ID" version="3.0">
    <display-name>mvnproject</display-name>
    <welcome-file-list>
        <welcome-file>index.jsp</welcome-file>
    </welcome-file-list>

    <servlet>
        <servlet-name>spring</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <load-on-startup>0</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>spring</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

    <listener>
    <listener-class>
      org.springframework.security.web.session.HttpSessionEventPublisher
    </listener-class>
  </listener>

  <!-- Spring Security -->
    <filter>
        <filter-name>springSecurityFilterChain</filter-name>
        <filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
    </filter>

    <filter-mapping>
        <filter-name>springSecurityFilterChain</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>
            /WEB-INF/spring-servlet.xml,
            /WEB-INF/spring-security.xml
        </param-value>
    </context-param>

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

      <session-config>
        <session-timeout>
            30
        </session-timeout>
    </session-config> 

    <error-page>
        <error-code>404</error-code>
        <location>/error404</location>
    </error-page>

    <error-page>
        <error-code>403</error-code>
        <location>/error403</location>
    </error-page>

    <error-page>
        <exception-type>java.lang.Throwable</exception-type>
        <location>/exception</location>
    </error-page>

我的日志已设置为调试级别，似乎没有错误，并且日志中的最后一些文件是

'org.springframework.web.servlet.resource.ResourceHttpRequestHandler#0'
[ INFO] 2014-04-16 21:53:53 Mapped URL path [/files/**] onto handler 'org.springframework.web.servlet.resource.ResourceHttpRequestHandler#1'
[ INFO] 2014-04-16 21:53:53 Mapped URL path [/profileImages/**] onto handler 'org.springframework.web.servlet.resource.ResourceHttpRequestHandler#2'
[ INFO] 2014-04-16 21:53:53 Mapped URL path [/**] onto handler 'org.springframework.web.servlet.resource.DefaultServletHttpRequestHandler#0'
[ INFO] 2014-04-16 21:53:53 Mapped URL path [/**] onto handler 'org.springframework.web.servlet.resource.DefaultServletHttpRequestHandler#1'
[ INFO] 2014-04-16 21:53:53 Starting beans in phase 2147483647
[ INFO] 2014-04-16 21:53:53 Starting Quartz Scheduler now
[ INFO] 2014-04-16 21:53:53 FrameworkServlet 'spring': initialization completed in 670 ms

Answer 1

我在工作中遇到了一些问题；现在我可以检查你的代码了；这是我的步骤:

• 我下载了github源代码
• 我执行了 mvn clean install 以下载所有需要的库

现在所有库都已下载，我开始检查问题。首先，我必须在主 pom 中添加以下依赖项:

<!--Angelo-->
<dependency>
    <groupId>org.simpleframework</groupId>
    <artifactId>simple-xml</artifactId>
    <version>2.7.1</version>
</dependency>
<dependency>
    <groupId>commons-codec</groupId>
    <artifactId>commons-codec</artifactId>
    <version>1.9</version>
</dependency>
        <dependency>
            <groupId>jstl</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>  
<!--Fine Angelo-->

通过添加这些依赖项，一切都编译得很好。但问题并没有到此为止。事实上，在 iBatis 映射器文件中，您有很多错误的类名。我猜您(或其他人)对模型类进行了重构，但忘记更新映射器文件(我想知道这段代码如何在您的 tomcat 上运行)

所以我修改了所有 XML 文件并尝试启动该应用程序；我还必须通过添加以下测试来修改 spring-security.xml 文件:

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

完成此操作后，我再次运行服务器，并且应用程序启动时没有错误；当我输入登录页面的网址时，com.jemmmedia.organise.service.impl.controller.LoginController.login(HttpSession, HttpServletResponse, HttpServletRequest, Model, FeedEntryBean, int, int, String)已成功调用；正如您所发生的那样，用于登录的 ModelAndView 为空这是控制台输出:

18:48:06,932 INFO  [LoginController] model View: ModelAndView: reference to view with name 'login'; model is null

但是，即使 modelandview 为空，登录页面也会出现

所以基本上我强烈建议你检查映射器文件和 spring-security 文件

我希望这能有所帮助干杯，安吉洛