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
package com.common;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.NoSuchBeanDefinitionException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
/**
* @program: IPC_1P
* @description: 获取在spring中托管的bean
* @author: johnny
* @create: 2018-08-03 16:24
**/
public class SpringContextUtil {
private static ApplicationContext applicationContext; // 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
public static void setApplicationContext(ApplicationContext applicationContext)
throws BeansException {
SpringContextUtil.applicationContext = applicationContext;
}
public static ApplicationContext getApplicationContext() {
return applicationContext;
}
public static Object getBean(String name) throws BeansException {
return applicationContext.getBean(name);
}
public static Object getBean(String name, Class requiredType)
throws BeansException {
return applicationContext.getBean(name, requiredType);
}
public static boolean containsBean(String name) {
return applicationContext.containsBean(name);
}
public static boolean isSingleton(String name)
throws NoSuchBeanDefinitionException {
return applicationContext.isSingleton(name);
}
public static Class getType(String name)
throws NoSuchBeanDefinitionException {
return applicationContext.getType(name);
}
public static String[] getAliases(String name)
throws NoSuchBeanDefinitionException {
return applicationContext.getAliases(name);
}
}
（2）使用
1）程序启动时，实例化 SpringContextUtil
@SpringBootApplication
public class WebappApplication {
private static ApplicationContext applicationContext;
public static void main(String[] args) {
applicationContext = SpringApplication.run(WebappApplication.class, args);
//
SpringContextUtil springContextUtil = new SpringContextUtil();
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
SenderService senderService;
public class Package_State {
@Autowired
SenderService senderService;
@Component
private Package_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网站的支持！
