1.获取spring容器中所有bean的工具类

/**
 * 获取spring容器中所有bean的工具类，（比如接口为UserService，生成的bean为userService，默认小写）
 */
@Component   //注意要交给springboot进行管理
public class ApplicationContextUtils implements ApplicationContextAware {

    private static ApplicationContext context;

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        //将容器中的bean赋值给context,为了static赋值
        this.context = applicationContext;
    }

    /**
     * 根据指定的名字获取bean对象
     * @param name
     * @return
     */
    public static Object getBean(String name) {
        return context.getBean(name);
    }
}

2.使用介绍

//调用获取所有bean的工具类,根据用户名查询当前用户的所有的角色信息,可以直接注入bean
        UserService userService = (UserService) ApplicationContextUtils.getBean("userService");
        //根据用户名查询用户信息
        User user = userService.findByUserName(name);

改进

@Component
public class ApplicationContextUtils implements ApplicationContextAware {

    private static ApplicationContext context;

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        //将容器中的bean赋值给context,为了static赋值
        this.context = applicationContext;
    }

    /**
     * 根据指定的名字获取bean对象
     * @param name
     * @return
     */
    public static Object getBean(String name) {
        return context.getBean(name);
    }

    //通过class获取
    public static <T> T getBean(Class<T> requiredType) throws BeansException {
        return context.getBean(requiredType);
    }
}

完整工具类

/**
 * spring 上下文工具类
 */
@Component
public class ApplicationContextUtil implements ApplicationContextAware {
  
    /**
     * 上下文对象实例
     */
    private static ApplicationContext applicationContext;
  
    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        ApplicationContextUtil.applicationContext = applicationContext;
    }
  
    /**
     * 获取applicationContext
     *
     * @return
     */
    public static ApplicationContext getApplicationContext() {
        return applicationContext;
    }
  
    /**
     * 通过name获取 Bean.
     *
     * @param name
     * @return
     */
    public static Object getBean(String name) {
        return getApplicationContext().getBean(name);
    }
  
    /**
     * 通过class获取Bean.
     *
     * @param clazz
     * @param <T>
     * @return
     */
    public static <T> T getBean(Class<T> clazz) {
        return getApplicationContext().getBean(clazz);
    }
  
    /**
     * 通过name,以及Clazz返回指定的Bean
     *
     * @param name
     * @param clazz
     * @param <T>
     * @return
     */
    public static <T> T getBean(String name, Class<T> clazz) {
        return getApplicationContext().getBean(name, clazz);
    }
}