如何配置Spring bean的原型？

Question

我之前把它写成一个singleton，没有错误。 但我认为我应该根据请求使它成为实例。 而且我有密码

<!--Dao configuration--> 
<bean id="userDao" class="org.mybatis.spring.mapper.MapperFactoryBean" scope="request"> 
    <property name="mapperInterface" value="Dao.UserDao"></property> 
    <property name="sqlSessionFactory" ref="sqlSessionFactory"></property> 
</bean> 


package Test; 
import org.springframework.beans.factory.annotation.Required; 
import org.springframework.context.annotation.Scope; 
import org.springframework.stereotype.Controller; 
import org.springframework.web.bind.annotation.PathVariable; 
import org.springframework.web.bind.annotation.RequestMapping; 
import org.springframework.web.bind.annotation.ResponseBody; 
import Common.InitDataBases; 
import Common.Controller.OutputStringController; 
import Dao.UserDao; 
import Model.User; 
import java.util.List; 

import org.apache.log4j.Logger; 

@Controller 
@Scope("request") 
public class Hello extends OutputStringController{ 
    private UserDao uDao; 
    @RequestMapping(value = "/getUser", produces = "text/html;charset=UTF-8") 
    @ResponseBody 
    public String dbTest(String username) { 
     System.out.println(uDao.findByUsername(username).getUsername()); 
     return success(""); 
    } 
    @Required 
    public void setuDao(UserDao uDao) { 
     this.uDao = uDao; 
    } 

} 

并且引发异常。

org.springframework.beans.factory.BeanInitializationException: Property 'uDao' is required for bean 'hello' 
    at org.springframework.beans.factory.annotation.RequiredAnnotationBeanPostProcessor.postProcessPropertyValues(RequiredAnnotationBeanPostProcessor.java:155) 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1225) 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:552) 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483) 
    at org.springframework.beans.factory.support.AbstractBeanFactory$2.getObject(AbstractBeanFactory.java:345) 
    at org.springframework.web.context.request.AbstractRequestAttributesScope.get(AbstractRequestAttributesScope.java:44) 
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:340) 
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) 
    at org.springframework.web.method.HandlerMethod.createWithResolvedBean(HandlerMethod.java:255) 
    at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.getHandlerInternal(AbstractHandlerMethodMapping.java:323) 
    at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.getHandlerInternal(AbstractHandlerMethodMapping.java:61) 
    at org.springframework.web.servlet.handler.AbstractHandlerMapping.getHandler(AbstractHandlerMapping.java:352) 
    at org.springframework.web.servlet.DispatcherServlet.getHandler(DispatcherServlet.java:1131) 
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:936) 
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:897) 
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970) 
    at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:624) 
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:731) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) 
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) 
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:218) 
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122) 
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505) 
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169) 
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103) 
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:956) 
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116) 
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:442) 
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1082) 
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:623) 
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316) 
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) 
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) 
    at java.lang.Thread.run(Thread.java:745) 

我现在找不到解决方案。 我想使它像：每个http请求将创建一个控制器，一个服务和一个道。 帮助！

Answer 1

看着异常

org.springframework.beans.factory.BeanInitializationException：房产 'uDao'是必需的'你好'

uDao没有配置注入到bean中。

使用

@Autowired 
private UserDao uDao; 

也确保如果组件扫描在XML配置中启用尝试。

Answer 2

你不需要@Scope（ “请求”），缺省是在原型用SpringMVC