某些时候，某些类是不归IOC管的，如我们的一些Util，如何使用IOC中的Bean？

 

1、写一个SpringUtil类，该类用于操纵Spring的ApplicationContext

@Component的注解是需要的，该Util是要被Spring管理的。

@Componentpublic class SpringUtil implements ApplicationContextAware{    private static ApplicationContext applicationContext;    @Override    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException    {        if (SpringUtil.applicationContext == null)        {            SpringUtil.applicationContext = applicationContext;        }    }    public static ApplicationContext getApplicationContext()    {        return applicationContext;    }    public static Object getBean(String name)    {        return getApplicationContext().getBean(name);    }    public static 
     
       T getBean(Class
      
        clazz)    {        return getApplicationContext().getBean(clazz);    }    public static 
       
         T getBean(String name, Class
        
          clazz)    {        return getApplicationContext().getBean(name, clazz);    }}
        
       
      
     

2、通过@Bean注解，返回一个Bean；

@Component@Transactionalpublic class SysParamBusiness{    @Autowired    private SysParamDao sysParamDao;        public void modify(SysParamMO mo) throws LittleCatException    {        sysParamDao.modify(mo);    }    public String getValueByName(String name) throws LittleCatException    {        return sysParamDao.getValueByName(name).getValue();    }    public List
     
       getList() throws LittleCatException    {        return sysParamDao.getList();    }        @Bean(name="SysParamBusiness")     public SysParamBusiness getSysParamBusiness()    {        return new SysParamBusiness();    }}
     

 

3、在我们自己的Util中使用

 

public class SysParamUtil{    public static String PARAM_NAME_MEMBER_ENABLE_DAYS = "member_enable_days";        private static final SysParamBusiness sysParamBusiness = (SysParamBusiness) SpringUtil.getBean("SysParamBusiness");    public static String getValueByName(String name) throws LittleCatException    {        return sysParamBusiness.getValueByName(name);    }}

 

注：

也可以这样使用（如果没有特殊逻辑，推荐使用这种方法）：

private static final SysParamBusiness sysParamBusiness = SpringUtil.getBean(SysParamBusiness.class);

 

这样，第二步就可以省略了。