spring mvc里， jsp中怎么获取bean?报错

SprintUtils，在你的jsp页面上面import这个类。然后通过

 
  SpringUtils.
  
   getApplicationContext
   
    ().getBean(
    
     "dataSource"
     
      )
     
    
   
  
 

获取指定的bean

packagecom.jsits.core;importorg.slf4j.Logger;importorg.slf4j.LoggerFactory;importorg.springframework.beans.BeansException;importorg.springframework.beans.factory.config.BeanFactoryPostProcessor;importorg.springframework.beans.factory.config.BeanPostProcessor;importorg.springframework.beans.factory.config.ConfigurableListableBeanFactory;importorg.springframework.beans.factory.support.BeanDefinitionRegistry;importorg.springframework.beans.factory.xml.ResourceEntityResolver;importorg.springframework.beans.factory.xml.XmlBeanDefinitionReader;importorg.springframework.context.ApplicationContext;importorg.springframework.context.ApplicationContextAware;importorg.springframework.context.ConfigurableApplicationContext;importorg.springframework.core.io.FileSystemResource;importorg.springframework.stereotype.Component;@ComponentpublicclassSpringUtilsimplementsBeanFactoryPostProcessor,BeanPostProcessor,ApplicationContextAware{protectedstaticLoggerlogger=LoggerFactory.getLogger(SpringUtils.class);privatestaticConfigurableApplicationContextapplicationContext=null;privatestaticConfigurableListableBeanFactorybeanFactory=null;@OverridepublicvoidsetApplicationContext(ApplicationContextapplicationContext)throwsBeansException{SpringUtils.applicationContext=(ConfigurableApplicationContext)applicationContext;}publicstaticConfigurableApplicationContextgetApplicationContext(){returnapplicationContext;}publicstaticConfigurableListableBeanFactorygetConfigurableListableBeanFactory(){returnbeanFactory;}@OverridepublicvoidpostProcessBeanFactory(ConfigurableListableBeanFactorybeanFactory)throwsBeansException{SpringUtils.beanFactory=beanFactory;}@OverridepublicObjectpostProcessBeforeInitialization(Objectbean,StringbeanName)throwsBeansException{returnbean;}@OverridepublicObjectpostProcessAfterInitialization(Objectbean,StringbeanName)throwsBeansException{returnbean;}publicstaticvoidregisterBean(Stringresource){BeanDefinitionRegistrybeanDefinitionRegistry=((BeanDefinitionRegistry)getConfigurableListableBeanFactory());XmlBeanDefinitionReaderdefinitionReader=newXmlBeanDefinitionReader(beanDefinitionRegistry);definitionReader.setResourceLoader(getApplicationContext());definitionReader.setEntityResolver(newResourceEntityResolver(getApplicationContext()));definitionReader.setValidating(false);definitionReader.setValidationMode(XmlBeanDefinitionReader.VALIDATION_NONE);definitionReader.loadBeanDefinitions(newFileSystemResource(resource));}publicstaticvoidunregisterBean(StringbeanName){if(containsBean(beanName)){BeanDefinitionRegistrybeanDefinitionRegistry=((BeanDefinitionRegistry)getConfigurableListableBeanFactory());beanDefinitionRegistry.removeBeanDefinition(beanName);}}publicstaticbooleancontainsBean(StringbeanName){returngetConfigurableListableBeanFactory().containsBeanDefinition(beanName);}}

回复 @ForEleven:加上了还是不行，我修改了问题，麻烦再帮我看看回复 @正厅级二奶:你的web.xml中有没有这个Listener<listener><listener-class>org.springframework.web.context.request.RequestContextListener</listener-class></listener>回复 @ForEleven:我后来@Service("sysservice")这么写了还是获取不到回复 @正厅级二奶:比如有一个Bean的类名是DemoService，使用注解他的默认名是demoService回复 @正厅级二奶:用了注解不是说没有名字了，比如你@Service注解里面可以定义这个bean的名字，如果不定义，默认是Bean的首字母小写@Autowired啊

引用来自“CrazyHarry”的评论

@Autowired啊 @正厅级二奶噢回复 @CrazyHarry:JSP里不能有注解的jsp里难道就不可以吗，同样的是在写Javacode啊Web.xml中加上这个Listener <listener><listener-class>org.springframework.web.context.request.RequestContextListener</listener-class></listener>

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

或者下面这个，额，忘记具体是哪个了，你都加上吧

回复 @ForEleven:改了下代码，解决了回复 @正厅级二奶:用我给你的那个SpringUtils试试看回复 @ForEleven:都加过了回复 @正厅级二奶:两个都加上呢？ContextLoaderListener我默认就有的WebApplicationContextUtils.getWebApplicationContext(application).getBean("studentService");还是没搞出来郁闷你的结构上正在走入歧途~~

引用来自“平安北京”的评论

WebApplicationContextUtils.getWebApplicationContext(application).getBean("studentService");

引用来自“sxgkwei”的评论

你的结构上正在走入歧途~~我只能呵呵的祝福你旅途愉快了。

看到jsp里这么多坑爹的代码真是醉倒了

你正在走向歧途~祝您旅途愉快~

试试：ctx.getBean(SystemService.class);
公共数据可以考虑用过滤器获取后放入request