Spring mvc controller bean configuration

Question

Spring mvc controller bean configuration

I am working on a project using Spring mvc and I counter a problem that a handler is auto generated when I start the server.

Here is the code:

Controller

@Controller
@RequestMapping(value="userstory/{projectid}/{sprintid}/")
@SessionAttributes(value = "user")
public class UserstoryController {
    private ISprintService sprintService;
    private IUserStoryService userStoryService;
    private IProjectService projectService;
    private IBurnDownChartService burnDownChartService;
    private ITaskService taskService;

    public void setSprintService(ISprintService sprintService) {
        this.sprintService = sprintService;
    }

    public void setUserStoryService(IUserStoryService userStoryService) {
        this.userStoryService = userStoryService;
    }

    public void setProjectService(IProjectService projectService) {
        this.projectService = projectService;
    }

    public void setBurnDownChartService(IBurnDownChartService burnDownChartService) {
        this.burnDownChartService = burnDownChartService;
    }

    public void setTaskService(ITaskService taskService) {
        this.taskService = taskService;
    }

    @RequestMapping(method=RequestMethod.GET)
    public String getUserstoryPage(@PathVariable("projectid") int pid, @PathVariable("sprintid") int sid,  @ModelAttribute("user") SerializablePerson user) {
        if (user.getId() != 0) {
            Project p = this.projectService.findProjectById(pid);
            if (p == null) {
                throw new ResourceNotFoundException(pid);
            }
            if (user.getRole().equals("User")) {
                return "userstory/user_userstory";
            }
            else {
                return "userstory/admin_userstory";
            }
        }
        return "redirect:../../../login";
    }

}

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beans.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
    <bean id="personServiceImpl" class="ch.bsgroup.scrumit.service.impl.PersonServiceImpl" />
    <bean id="projectServiceImpl" class="ch.bsgroup.scrumit.service.impl.ProjectServiceImpl" />
    <bean id="sprintServiceImpl" class="ch.bsgroup.scrumit.service.impl.SprintServiceImpl" />
    <bean id="userStoryServiceImpl" class="ch.bsgroup.scrumit.service.impl.UserStoryServiceImpl" />
    <bean id="taskServiceImpl" class="ch.bsgroup.scrumit.service.impl.TaskServiceImpl" />

    <bean id="projectService" class="ch.bsgroup.scrumit.service.impl.ProjectServiceImpl" />
    <bean id="personService" class="ch.bsgroup.scrumit.service.impl.PersonServiceImpl" />

    <bean id="sprintService" class="ch.bsgroup.scrumit.service.impl.SprintServiceImpl" />
    <bean id="userStoryService" class="ch.bsgroup.scrumit.service.impl.UserStoryServiceImpl" />
    <bean id="burnDownChartService" class="ch.bsgroup.scrumit.service.impl.BurnDownChartServiceImpl" />
    <bean id="taskService" class="ch.bsgroup.scrumit.service.impl.TaskServiceImpl" />

    <bean id="sprintUserstoryController" class="ch.bsgroup.scrumit.controller.SprintUserstoryController">
        <property name="sprintService">
            <ref local="sprintService"/>
        </property>
        <property name="userStoryService">
            <ref local="userStoryService"/>
        </property>
        <property name="projectService">
            <ref local="projectService"/>
        </property>
        <property name="burnDownChartService">
            <ref local="burnDownChartService"/>
        </property>
        <property name="taskService">
            <ref local="taskService"/>
        </property>
    </bean>

    <bean id="boardController" class="ch.bsgroup.scrumit.controller.BoardController">
        <property name="sprintService">
            <ref local="sprintService"/>
        </property>
        <property name="projectService">
            <ref local="projectService"/>
        </property>
        <property name="userStoryService">
            <ref local="userStoryService"/>
        </property>
        <property name="taskService">
            <ref local="taskService"/>
        </property>
        <property name="burnDownChartService">
            <ref local="burnDownChartService"/>
        </property>
    </bean>

    <bean name="register.jsp" id="registerController" class="ch.bsgroup.scrumit.controller.RegisterController">
        <property name="personService">
            <ref local="personService"/>
        </property>
    </bean>

    <bean id="loginController" class="ch.bsgroup.scrumit.controller.LoginController" >
        <property name="personService">
            <ref local="personService"/>
        </property>
    </bean>

    <bean id="adminProjectController" class="ch.bsgroup.scrumit.controller.AdminProjectController">
        <property name="projectService">
            <ref local="projectService"/>
        </property>
        <property name="personService">
            <ref local="personService"/>
        </property>
    </bean>

    <bean id="userProjectController" class="ch.bsgroup.scrumit.controller.UserProjectController">
        <property name="projectService">
            <ref local="projectService"/>
        </property>
    </bean>

    <bean id="adminPersonController" class="ch.bsgroup.scrumit.controller.AdminPersonController">
        <property name="projectService">
            <ref local="projectService"/>
        </property>
        <property name="personService">
            <ref local="personService"/>
        </property>
    </bean>

    <bean id="manageProjectMemberController" class="ch.bsgroup.scrumit.controller.ManageProjectMemberController">
        <property name="projectService">
            <ref local="projectService"/>
        </property>
        <property name="personService">
            <ref local="personService"/>
        </property>
    </bean>

    <bean id="manageUserstoryController" class="ch.bsgroup.scrumit.controller.UserstoryController">
        <property name="sprintService">
            <ref local="sprintService"/>
        </property>
        <property name="userStoryService">
            <ref local="userStoryService"/>
        </property>
        <property name="projectService">
            <ref local="projectService"/>
        </property>
        <property name="burnDownChartService">
            <ref local="burnDownChartService"/>
        </property>
        <property name="taskService">
            <ref local="taskService"/>
        </property>
    </bean>
</beans>

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I copy all the beans to show that there is no userstoryController mapped.

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" version="2.5">
  <filter>
    <filter-name>characterEncodingFilter</filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    <init-param>
      <param-name>encoding</param-name>
      <param-value>UTF-8</param-value>
    </init-param>
    <init-param>
      <param-name>forceEncoding</param-name>
      <param-value>true</param-value>
    </init-param>
  </filter>
  <filter-mapping>
    <filter-name>characterEncodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>
  <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>
  <servlet>
    <servlet-name>scrumit</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>/WEB-INF/spring/app-config.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>scrumit</servlet-name>
    <url-pattern>/app/*</url-pattern>
  </servlet-mapping>
</web-app>

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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="ch.bsgroup.scrumit.controller" />

    <!-- 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>

    <!-- Including beans -->
    <import resource="beans.xml" />

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

</beans>

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And this is what I have when I start the server:

INFO : org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping - Mapped URL path [/userstory/{projectid}/{sprintid}/] onto handler 'userstoryController'

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The error is:

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping#0': Initialization of bean failed; nested exception is java.lang.IllegalStateException: Cannot map handler 'manageUserstoryController' to URL path [/userstory/{projectid}/{sprintid}/]: There is already handler of type [class ch.bsgroup.scrumit.controller.UserstoryController] mapped.

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由于userstoryController的存在,该程序不允许我将UserstoryController映射到manageUserstoryController.

任何人都可以向我解释为什么生成userstoryController,以及如何正确映射它.提前致谢.

Answer 1

Sot*_*lis 14

问题如下.这个元素

<context:component-scan base-package="ch.bsgroup.scrumit.controller" />

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UserstoryController因为你已经创建了一个控制器实例@Controller.然后<bean>元素beans.xml创建另一个元素.

当您使用@Controller适当的类注释类时component-scan,不应bean在上下文中声明单独的元素.

事实是,所有这一切

<bean id="boardController" class="ch.bsgroup.scrumit.controller.BoardController">
    <property name="sprintService">
        <ref local="sprintService"/>
    </property>
    <property name="projectService">
        <ref local="projectService"/>
    </property>
    <property name="userStoryService">
        <ref local="userStoryService"/>
    </property>
    <property name="taskService">
        <ref local="taskService"/>
    </property>
    <property name="burnDownChartService">
        <ref local="burnDownChartService"/>
    </property>
</bean>

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可以用@Autowired字段上的适当注释替换.你甚至不需要getter和setter.例如

@Controller
@RequestMapping(value="userstory/{projectid}/{sprintid}/")
@SessionAttributes(value = "user")
public class UserstoryController {
    @Autowired
    private ISprintService sprintService;

    @Autowired
    private IUserStoryService userStoryService;

    @Autowired
    private IProjectService projectService;

    @Autowired
    private IBurnDownChartService burnDownChartService;

    @Autowired
    private ITaskService taskService;

    @RequestMapping(method=RequestMethod.GET)
    public String getUserstoryPage(@PathVariable("projectid") int pid, @PathVariable("sprintid") int sid,  @ModelAttribute("user") SerializablePerson user) {
        if (user.getId() != 0) {
            Project p = this.projectService.findProjectById(pid);
            if (p == null) {
                throw new ResourceNotFoundException(pid);
            }
            if (user.getRole().equals("User")) {
                return "userstory/user_userstory";
            }
            else {
                return "userstory/admin_userstory";
            }
        }
        return "redirect:../../../login";
    }
}

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这是一些相关的文档:

@lightbringer如果为`services`包添加组件扫描并使用`@Service`注释所有服务类,那么,不,你不需要它. (2认同)

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