spring mvc中xml文件中的错误

Question

我有春天项目的三个xml文件，如下所示

应用context.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:p="http://www.springframework.org/schema/p"
 xmlns:aop="http://www.springframework.org/schema/aop"   
xmlns:tx="http://www.springframework.org/schema/tx"
 xmlns:context="http://www.springframework.org/schema/context"
 xmlns:util="http://www.springframework.org/schema/util"
 xsi:schemaLocation="http://www.springframework.org/schema/beans   
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
 http://www.springframework.org/schema/jdbc  http://www.springframework.org/schema 
      /jdbc/spring-jdbc-3.0.xsd
 http://www.springframework.org/schema/tx   http://www.springframework.org/schema 
    /tx/spring-tx-3.0.xsd
 http://www.springframework.org/schema/util  http://www.springframework.org/schema 
    /util/spring-util-3.0.xsd
 http://www.springframework.org/schema/mvc   http://www.springframework.org/schema 
     /mvc/spring-mvc-3.0.xsd
 http://www.springframework.org/schema/context  http://www.springframework.org/schema 
     /context/spring-context-3.0.xsd">


 <context:annotation-config/>

<bean id="basicDataSource" class="org.apache.commons.dbcp.BasicDataSource">
    <property name="driverClassName" value="com.mysql.jdbc.Driver" />
    <property name="url" value="jdbc:mysql://localhost:3306/indi" />
    <property name="username" value="root" />
    <property name="password" value="" />

 </bean>  

</beans>

CController-servlet.xml（经理级别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:p="http://www.springframework.org/schema/p"
 xmlns:aop="http://www.springframework.org/schema/aop"  
 xmlns:tx="http://www.springframework.org/schema/tx"
 xmlns:context="http://www.springframework.org/schema/context"
 xmlns:util="http://www.springframework.org/schema/util"
 xsi:schemaLocation="http://www.springframework.org/schema/beans  
 http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
 http://www.springframework.org/schema/aop  http://www.springframework.org/schema 
      /aop/spring-aop-2.5.xsd
 http://www.springframework.org/schema/tx http://www.springframework.org/schema
      /tx/spring-tx-2.5.xsd
 http://www.springframework.org/schema/util  http://www.springframework.org/schema
   /util/spring-util-2.0.xsd
 http://www.springframework.org/schema/context http://www.springframework.org/schema 
     /context/spring-context-2.5.xsd">

  <context:annotation-config/>
  <context:component-scan base-package="project4"/>

 <bean  
class="org.springframework.web.servlet.mvc.support.ControllerClassNameHandlerMapping"/>


 <bean id="urlMapping"   
     class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
    <property name="mappings">
        <props>
            <prop key="index.htm">indexController</prop>


        </props>
    </property>
</bean>



<bean id="viewResolver"
      class="org.springframework.web.servlet.view.InternalResourceViewResolver"
      p:prefix="/WEB-INF/jsp/"
      p:suffix=".jsp" />


<bean name="frm4" class="project4.CController" >
    <property name="userDAO" ref="myUserDAO" />
</bean>


<bean name="indexController"  
    class="org.springframework.web.servlet.mvc.ParameterizableViewController"
      p:viewName="index" />

</beans>

和UUController-servlet.xml（这是一个dao级别的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:p="http://www.springframework.org/schema/p"
 xmlns:aop="http://www.springframework.org/schema/aop"  
xmlns:tx="http://www.springframework.org/schema/tx"
 xmlns:context="http://www.springframework.org/schema/context"
 xmlns:util="http://www.springframework.org/schema/util"
 xsi:schemaLocation="http://www.springframework.org/schema/beans  
 http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
 http://www.springframework.org/schema/aop  http://www.springframework.org/schema 
    /aop/spring-aop-2.5.xsd
  http://www.springframework.org/schema/tx http://www.springframework.org/schema
     /tx/spring-tx-2.5.xsd
   http://www.springframework.org/schema/util  http://www.springframework.org/schema
   /util/spring-util-2.0.xsd
  http://www.springframework.org/schema/context http://www.springframework.org/schema
    /context/spring-context-2.5.xsd">



<bean id="mySessionFactory"   
  class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
      <property name="dataSource" ref="myDataSource" />
      <property name="packagesToScan" value="project4"/>

      <property name="hibernateProperties">
          <props>
              <prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>
              <prop key="hibernate.show_sql">true</prop>
              <prop key="hibernate.hbm2ddl.auto">create</prop>
          </props>
      </property>
  </bean>

<bean id="myUserDAO" class="project4.UserDAOImpl1">
    <property name="sessionFactory" ref="mySessionFactory"/>
</bean>
</beans>

我有两个xml文件，一个用于管理器调用，另一个用于dao调用...我知道从一个xml点到另一个xml中的bean的ref链接。我认为它们会自动链接但是我收到以下错误

 Error creating bean with name  
'org.springframework.web.servlet.mvc.support.ControllerClassNameHandlerMapping#0'
 defined in ServletContext resource [/WEB-INF/CController-servlet.xml]: Initialization
 of bean failed; nested exception is 
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 
 'frm4' defined in ServletContext resource [/WEB-INF/CController-servlet.xml]: Cannot 
  resolve reference to bean 'myUserDAO' while setting bean property 'userDAO'; nested 
  exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No 
    bean     named 'myUserDAO' is defined



Caused by: org.springframework.beans.factory.BeanCreationException: Error creating 
bean with name 'frm4' defined in ServletContext resource [/WEB-INF/CController-
servlet.xml]: Cannot resolve reference to bean 'myUserDAO' while setting bean property
  'userDAO'; nested exception is 
org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 
'myUserDAO' is defined

UserDAOImpl1是我的hibernate模板类，CCController是我的spring控制器类

CCController.java

package project4;
import project4.UserDAO1;
import project4.User1;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.stereotype.Controller;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.multiaction.MultiActionController;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.validation.BindingResult;


@Controller
@RequestMapping("frm4.do")

public class CController{

   private UserDAO1 userDAO;

    public void setUserDAO(UserDAO1 userDAO) {
        this.userDAO = userDAO;
    }

    @RequestMapping(params = "/add", method = RequestMethod.POST)
  public ModelAndView add( @ModelAttribute("add") User1 user,HttpServletRequest 
            request,HttpServletResponse response) throws Exception {
        userDAO.saveUser(user);
        System.out.println("hai");
        return new ModelAndView("redirect:list.htm");
    }

    @RequestMapping(params = "delete", method = RequestMethod.POST)
    @Transactional
    public ModelAndView delete(@ModelAttribute("delete") User1 user,HttpServletRequest
           request,HttpServletResponse response) throws Exception {
           userDAO.deleteUser(user);
           return new ModelAndView("redirect:list.htm");
    }

    @RequestMapping(params = "find", method = RequestMethod.POST)
    @Transactional
    public ModelAndView find(@ModelAttribute("find") User1 user,HttpServletRequest 
                  request,HttpServletResponse response) throws Exception {  
                     userDAO.findUser(user);
                      return new ModelAndView("redirect:list.htm");
    }


    @RequestMapping(params = "update", method = RequestMethod.POST)
    @Transactional
    public ModelAndView update(@ModelAttribute("update") User1 user,HttpServletRequest
               request,HttpServletResponse response) throws Exception {  
                     userDAO.updateUser(user);
                      return new ModelAndView("redirect:list.htm");
    }

    public ModelAndView list(HttpServletRequest request,
        HttpServletResponse response) throws Exception {


    ModelMap modelMap = new ModelMap();
    modelMap.addAttribute("userList", userDAO.listUser());
    modelMap.addAttribute("user", new User1());
    return new ModelAndView("userForm", modelMap);
  }
  } 

有人可以帮助PLZ

编辑：

web.xml如下

 <context-param>
 <param-name>contextConfigLocation</param-name>
 <param-value> /WEB-INF/application-context.xml</param-value>     
 </context-param>  

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


 <servlet>
    <servlet-name>CController</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <load-on-startup>2</load-on-startup>
 </servlet>
 <servlet-mapping>
    <servlet-name>CController</servlet-name>
    <url-pattern>*.do</url-pattern>
 </servlet-mapping>

Answer 1

frm4 bean有一个引用userDAO的属性，该属性在其他xml文件中声明。因此，请确保在应用程序上下文中加载所有xml文件。为此，您需要在web.xml中添加所有xml文件。

试试这个：

<context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>
    /WEB-INF/UUController-servlet.xml,
    /WEB-INF/application-context.xml,
    /WEB-INF/CController-servlet.xml
    </param-value>     
</context-param> 

编辑：
如果这不适合你。尝试在application-context.xml文件中添加其他文件。使用bean导入标记。

<beans:import resource="/WEB-INF/UUController-servlet.xml"/>
<beans:import resource="/WEB-INF/CController-servlet.xml"/>

并在启动时仅加载应用程序上下文文件。

编辑：

错误“无法映射处理程序”背后的原因是您在应用程序启动时扫描组件，并且还在应用程序上下文中声明了相同的bean。

<context:component-scan base-package="project4"/>

＆安培;

<bean name="frm4" class="project4.CController" >
    <property name="userDAO" ref="myUserDAO" />
</bean>

从xml文件中删除bean声明，因为您已经扫描了该特定组件。并在您的控制器类中自动装配myUserDAO bean。

@Autowire
@Qualifier("myUserDAO")
private UserDAOImpl1 myUserDAO;

Answer 2

问题是应用程序上下文未加载UUController-servlet文件。由于它是数据库级别的上下文，因此将其添加到contextConfigLocation，如下所示。我还建议将其重命名为dao-context.xml

 <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>
        /WEB-INF/application-context.xml
        /WEB-INF/UUController-servlet.xml
    </param-value>     
 </context-param>