Solve the problem of injecting Service into null by ordinary class in SpringMvc

The common class in SpringMvc injects Service into null

Scenario:

When using the Quartz timer, the ordinary java class needs to be injected into the spring service class, and an error is reported in the call!

Solution:

    /**
     *  Obtain the course regularly service
     */
    @Autowired
    protected QuartzGetCourseService quartzGetCourseService = (QuartzGetCourseService) SpringContextUtil
            .getBean("quartzGetCourseService");

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.NoSuchBeanDefinitionException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;
 
/**
 *  In Spring  In the annotation, the common class gets the @Service The method of marking or bean Object 
 *
 */
@Component
public class SpringContextUtil implements ApplicationContextAware {
    private static ApplicationContext applicationContext = null;
 
    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        SpringContextUtil.applicationContext = applicationContext;
    }
 
    public static ApplicationContext getApplicationContext() {
        return applicationContext;
    }
 
    /**
     *  Attention  bean name Default  =  Class name ( First letter lowercase )  For example : A8sClusterDao = getBean("a8sClusterDao")
     *
     * @param name
     * @return
     * @throws BeansException
     */
    public static Object getBean(String name) throws BeansException {
        return applicationContext.getBean(name);
    }
 
    /**
     *  Obtained from the class name bean
     *
     * @param <T>
     * @param clazz
     * @return
     * @throws BeansException
     */
    @SuppressWarnings("unchecked")
    public static <T> T getBeanByName(Class<T> clazz) throws BeansException {
        try {
            char[] cs = clazz.getSimpleName().toCharArray();
            cs[0] += 32;//  First letter uppercase to lowercase 
            return (T) applicationContext.getBean(String.valueOf(cs));
        }
        catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }
 
    public static boolean containsBean(String name) {
        return applicationContext.containsBean(name);
    }
 
    public static boolean isSingleton(String name) throws NoSuchBeanDefinitionException {
        return applicationContext.isSingleton(name);
    } 
}

At the end of the call, the test can get Service.

The tool class of spring uses service injection

1 needs to inject an service in a tool class with the @ Autowired annotation. However, since tool class method 1 is generally written as static, direct injection is problematic.

Chestnuts:

@Component  
public class SmsController {    
    private static Logger logger = LoggerFactory.getLogger(SmsController.class);    
    @Autowired  
    private MessagesInfoService messagesInfoService;  
    private static SmsController smsController;     
      
    @PostConstruct  
    public void init() {  
        smsController = this;  
        smsController.messagesInfoService = this.messagesInfoService;    
    }  
  
    /**
     * SMS history query interface ( Query the SMS sent in a certain time period )
     */
    @RequestMapping(value = "/queryMessage",method = RequestMethod.GET)
    public ModelAndView queryMessage{ 
        pager = messagesInfoService.findPager(map,5,pIndex);
        ModelAndView modelAndView = new ModelAndView("manage/jgdxgl/jgdx_qm");
        List<MessagesInfo> list = pager.getItem();
        modelAndView.addObject("pager",pager);
        modelAndView.addObject("list",list);
        return modelAndView
    }      
}