解决SpringMvc中普通类注入Service为null的问题

解决SpringMvc中普通类注入Service为null的问题

SpringMvc中普通类注入Service为null

场景：

使用Quartz定时器时,普通的java类需要注入spring的service类,在调用时报错!

解决方式：

/**

* 定时获取课程的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;

/**

* 在Spring 注解中，普通类获取@Service标记的方法或者bean对象

*

*/

@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;

}

/**

*http:// 注意 bean name默认 = 类名(首字母小写) 例如: A8sClusterDao = getBean("a8sClusterDao")

*

* @param name

* @return

* @throws BeansException

*/

public static Object getBean(String name) throws BeansException {

return applicationContext.getBean(name);

}

/**

* 根据类名获取到bean

*

* @param

* @param clazz

* @return

* @throws BeansException

*/

@SuppressWarnings("unchecked")

public static T getBeanByName(Class clazz) throws BeansException {

try {

char[] cs = clazz.getSimpleName().toCharArray();

cs[0] += 32;// 首字母大写到小写

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);

}

}

调用结束，测试可以获取Service.

spring之工具类使用service注入

一般需要在一个工具类中使用@Autowired 注解注入一个service。但是由于工具类方法一般都写成static，所以直接注入就存在问题。

栗子:

@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;

}

/**

*短信历史查询接口(查询某个时间段发送的短信)

*/

@RequestMapping(value = "/queryMessage",method = RequestMethod.GET)

public ModelAndView queryMessage{

pager = messagesInfoService.findPager(map,5,pIndex);

ModelAndView modelAndVhttp://iew = new ModelAndView("manage/jgdxgl/jgdx_qm");

List list = pager.getItem();

modelAndView.addObject("pager",pager);

modelAndView.addObject("list",list);

return modelAndView

doXJc }

}

* @param clazz

* @return

* @throws BeansException

*/

@SuppressWarnings("unchecked")

public static T getBeanByName(Class clazz) throws BeansException {

try {

char[] cs = clazz.getSimpleName().toCharArray();

cs[0] += 32;// 首字母大写到小写

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);

}

}

调用结束，测试可以获取Service.

spring之工具类使用service注入

一般需要在一个工具类中使用@Autowired 注解注入一个service。但是由于工具类方法一般都写成static，所以直接注入就存在问题。

栗子:

@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;

}

/**

*短信历史查询接口(查询某个时间段发送的短信)

*/

@RequestMapping(value = "/queryMessage",method = RequestMethod.GET)

public ModelAndView queryMessage{

pager = messagesInfoService.findPager(map,5,pIndex);

ModelAndView modelAndVhttp://iew = new ModelAndView("manage/jgdxgl/jgdx_qm");

List list = pager.getItem();

modelAndView.addObject("pager",pager);

modelAndView.addObject("list",list);

return modelAndView

doXJc }

}

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