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在春季將單個控制器映射到幾個bean

[英]Mapping a single controller to several beans in spring

 原文  2013-10-08 08:44:25  6   2    java/ spring/ spring-mvc

問題描述

我需要使用一個控制器類為具有不同ID的靜態頁面創建多個bean，該控制器類具有定義要顯示的jsp名稱的屬性。

我曾經使用FormControllers在較舊的版本中執行此操作，但在3.2.4版中卻無法執行此操作，因此我檢查了幾個主題，並了解到Spring bean是單例，但是我想知道是否有可能或是否有解決方法而不創建空白每個頁面的控制器類。

這是BaseController類： 

    public class BaseController extends AbstractController {

    public String contentPage;

    @Override
    protected ModelAndView handleRequestInternal(HttpServletRequest request, HttpServletResponse response) throws Exception {
        ModelAndView mv = new ModelAndView("common/mainlayout");

        if(contentPage != null && !contentPage.equals("")){
            mv.addObject("mainContent", "maincontent/" + contentPage);
            mv.addObject("mainMenuSelect", contentPage);
        }

        return mv;
    }

    public String getContentPage() {
        return contentPage;
    }
    public void setContentPage(String contentPage) {
        this.contentPage = contentPage;
    }
}

這是我在spring-servlet.xml中的映射。請注意，我也嘗試使用BaseController定義每個bean的類。 

<bean id="urlMapping"
    class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
    <property name="mappings">
        <props>

            <!-- STATIC PAGES -->
            <prop key="/index.dlg">indexPageController</prop>
            <prop key="/faq.dlg">faqController</prop>
            <prop key="/howto.dlg">howtoController</prop>
            <prop key="/contactUs.dlg">contactUsController</prop>
            <prop key="/aboutUs.dlg">aboutUsController</prop>

            <!-- DYNAMIC PAGES -->
            <prop key="/postBox.dlg">postBoxController</prop>
            <prop key="/invoiceBox.dlg">invoiceController</prop>
        </props>
    </property>

    <property name="interceptors">
        <list>
            <ref bean="siteInterceptor" />
        </list>
    </property>

</bean>

<bean id="siteInterceptor" class="com.entegrator.spring.interceptor.SiteInterceptor"></bean>

<!-- STATIC PAGE CONTROLLERS -->
<bean id="baseController" abstract="true" class="com.entegrator.spring.controller.BaseController" />

<bean id="indexPageController" parent="baseController" >
    <property name="contentPage" value="index" />
</bean>

<bean id="faqController" parent="baseController" >
    <property name="contentPage" value="faq" />
</bean>

<bean id="howtoController" parent="baseController" >
    <property name="contentPage" value="howto" />
</bean>

<bean id="contactUsController" parent="baseController" >
    <property name="contentPage" value="contactUs" />
</bean>

<bean id="aboutUsController" parent="baseController" >
    <property name="contentPage" value="aboutUs" />
</bean>
<!-- STATIC PAGE CONTROLLERS END -->


<!-- DYNAMIC PAGE CONTROLLERS -->
<bean id="postBoxController" class="com.entegrator.spring.controller.PostBoxController">
    <property name="postBoxManager" ref="postBoxManager" />
</bean>
<bean id="invoiceController" class="com.entegrator.spring.controller.InvoiceController">
    <property name="postBoxManager" ref="postBoxManager" />
</bean>
<!-- DYNAMIC PAGE CONTROLLERS END -->

我的web.xml是： 

<display-name>EntegratorPortal</display-name>
    <welcome-file-list>
        <welcome-file>index.jsp</welcome-file>
    </welcome-file-list>


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

    <servlet>
        <servlet-name>spring</servlet-name>
        <servlet-class>
            org.springframework.web.servlet.DispatcherServlet
        </servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>spring</servlet-name>
        <url-pattern>*.dlg</url-pattern>
    </servlet-mapping>

這是我的錯誤日志： 

 SEVERE: StandardWrapper.Throwable
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.web.servlet.mvc.support.ControllerClassNameHandlerMapping#0' defined in ServletContext resource [/WEB-INF/spring-servlet.xml]: Initialization of bean failed; nested exception is java.lang.IllegalStateException: Cannot map handler 'faqController' to URL path [/base*]: There is already handler 'indexPageController' mapped.
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:529)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:458)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:295)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:223)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:292)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:628)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:932)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:479)
    at org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:651)
    at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:599)
    at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:665)
    at org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:518)
    at org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:459)
    at org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:136)
    at javax.servlet.GenericServlet.init(GenericServlet.java:160)
    at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1280)
    at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1193)
    at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:865)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:136)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
    at java.lang.Thread.run(Thread.java:662)
Caused by: java.lang.IllegalStateException: Cannot map handler 'faqController' to URL path [/base*]: There is already handler 'indexPageController' mapped.
    at org.springframework.web.servlet.handler.AbstractUrlHandlerMapping.registerHandler(AbstractUrlHandlerMapping.java:294)
    at org.springframework.web.servlet.handler.AbstractUrlHandlerMapping.registerHandler(AbstractUrlHandlerMapping.java:266)
    at org.springframework.web.servlet.handler.AbstractDetectingUrlHandlerMapping.detectHandlers(AbstractDetectingUrlHandlerMapping.java:82)
    at org.springframework.web.servlet.handler.AbstractDetectingUrlHandlerMapping.initApplicationContext(AbstractDetectingUrlHandlerMapping.java:58)
    at org.springframework.context.support.ApplicationObjectSupport.initApplicationContext(ApplicationObjectSupport.java:119)
    at org.springframework.web.context.support.WebApplicationObjectSupport.initApplicationContext(WebApplicationObjectSupport.java:72)
    at org.springframework.context.support.ApplicationObjectSupport.setApplicationContext(ApplicationObjectSupport.java:73)
    at org.springframework.context.support.ApplicationContextAwareProcessor.invokeAwareInterfaces(ApplicationContextAwareProcessor.java:117)
    at org.springframework.context.support.ApplicationContextAwareProcessor.postProcessBeforeInitialization(ApplicationContextAwareProcessor.java:92)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInitialization(AbstractAutowireCapableBeanFactory.java:396)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1475)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:521)
    ... 32 more

謝謝你的幫助

2 個解決方案

解決方案1
 0  2013-10-08 09:24:38

您是否可以簡單地在每個頁面的一個控制器中使用@RequestMapping（value =“ / foo” method =“ RequestMethod.GET”）注釋的方法？

這似乎是最簡單的解決方案。

您的控制器看起來像這樣： 

@Controller
public class BaseController
{

    @RequestMapping(value="/index", method="RequestMethod.GET")
    public String returnIndexPage()
    {
        return "Your Index JSP Page Location Here";
    }

    @RequestMapping(value="/faq", method="RequestMethod.GET")
    public String returnFAQPage()
    {
         return("Your FAQ JSP Page Location Here";
    }

等等...

您可以根據需要對其進行修改，使其僅返回內容頁面變量。

當然也可以。

讓我知道你是怎么辦的。

解決方案2
 0  2013-10-08 09:29:08

為什么不利用新的spring @Controller和@RequestMapping注釋？ 這樣，您只需要一個控制器。 

@Controller
public class StaticController {


    @RequestMapping({"/index.dlg", "/howto", // The rest of your mappings}
    public String handleStatic(HttpServletRequest request, Model model) {
        String contentPage = //Extract page-name from request 
        model.addObject("mainContent", "maincontent/" + contentPage);
        model.addObject("mainMenuSelect", contentPage);  
        return "common/mainlayout";      
    }
}

然后，該控制器可以被檢測，並通過使用設定RequestMappingHandlermapping和由所執行的RequestMappingHandlerAdapter （那些通過使用注冊<mvc:annotation-driven />在XML配置）。

或利用springs view-controller（ <mvc:view-controller .. /> ）並添加一個攔截器，以將所需的屬性添加到模型中 

<mvc:view-controller path="/index.dlg" view-name="common/mainlayout" />
<mvc:view-controller path="/faq.dlg" view-name="common/mainlayout" />

<mvc:interceptors>
    <mvc:interceptor>
        <mapping path="/index.dlg" />
        <mapping path="/faq/dlg" />
        <bean class="YourInterceptor" />
    </mvc:interceptor>
</mvc:interceptors>

這種方法的缺點是您基本上在復制映射（一次用於控制器，一次用於攔截器）。

鏈接

  1. 實施控制器參考指南
  2. View Controller 參考指南
  3. 配置攔截器參考指南

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