解决Springboot @Autowired 无法注入问题
特别提醒：一定要注意文件结构
WebappApplication一定要在包的最外层，否则Spring无法对所有的类进行托管，会造成@Autowired无法注入。
1.添加工具类获取在Spring中托管的Bean
（1）工具类
packagecom.common;
importorg.springframework.beans.BeansException;
importorg.springframework.beans.factory.NoSuchBeanDefinitionException;
importorg.springframework.context.ApplicationContext;
importorg.springframework.context.ApplicationContextAware;
/**
*@program:IPC_1P
*@description:获取在spring中托管的bean
*@author:johnny
*@create:2018-08-0316:24
**/
publicclassSpringContextUtil{
privatestaticApplicationContextapplicationContext;//Spring应用上下文
//下面的这个方法上加了@Override注解，原因是继承ApplicationContextAware接口是必须实现的方法
publicstaticvoidsetApplicationContext(ApplicationContextapplicationContext)
throwsBeansException{
SpringContextUtil.applicationContext=applicationContext;
}
publicstaticApplicationContextgetApplicationContext(){
returnapplicationContext;
}
publicstaticObjectgetBean(Stringname)throwsBeansException{
returnapplicationContext.getBean(name);
}
publicstaticObjectgetBean(Stringname,ClassrequiredType)
throwsBeansException{
returnapplicationContext.getBean(name,requiredType);
}
publicstaticbooleancontainsBean(Stringname){
returnapplicationContext.containsBean(name);
}
publicstaticbooleanisSingleton(Stringname)
throwsNoSuchBeanDefinitionException{
returnapplicationContext.isSingleton(name);
}
publicstaticClassgetType(Stringname)
throwsNoSuchBeanDefinitionException{
returnapplicationContext.getType(name);
}
publicstaticString[]getAliases(Stringname)
throwsNoSuchBeanDefinitionException{
returnapplicationContext.getAliases(name);
}
}
（2）使用
1）程序启动时，实例化SpringContextUtil
@SpringBootApplication
publicclassWebappApplication{
privatestaticApplicationContextapplicationContext;
publicstaticvoidmain(String[]args){
applicationContext=SpringApplication.run(WebappApplication.class,args);
//
SpringContextUtilspringContextUtil=newSpringContextUtil();
springContextUtil.setApplicationContext(applicationContext);
System.out.println("服务器启动测试!");
}
2）在使用@Service的方法中，通过@Autowired注入，使用SpringcontexUtil获取Bean上下文
@Autowired
SenderServicesenderService;
publicclassPackage_State{
@Autowired
SenderServicesenderService;
@Component
privatePackage_State(){
senderService=(SenderService)SpringContextUtil.getBean("senderService");
}
}
总结
以上所述是小编给大家介绍的解决Springboot@Autowired无法注入问题，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对毛票票网站的支持！