springboot工具类注入service层 springboot实现在工具类(util)中调用注入service层方法

import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.DisposableBean;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import java.util.ArrayList;
import java.util.List;
 
@Slf4j
public class BeanUtil implements ApplicationContextAware, DisposableBean {
    private static ApplicationContext applicationContext = null;
 
    /**
     * 从静态变量applicationContext中取得Bean, 自动转型为所赋值对象的类型.
     */
    public static <T> T getBean(Class<T> requiredType) {
        if(applicationContext==null){
            throw new IllegalStateException("applicaitonContext属性未注入, 请在SpringBoot启动类中注册BeanUtil.");
        }
        return applicationContext.getBean(requiredType);
    }
  
    @Override
    public void destroy() {
        applicationContext = null;
    }
 
    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        if (BeanUtil.applicationContext != null) {
            log.warn("BeanUtil中的ApplicationContext被覆盖, 原有ApplicationContext为:" + BeanUtil.applicationContext);
        }
        BeanUtil.applicationContext = applicationContext;
    }
}

@SpringBootApplication
public class StartApplication {
 
    public static void main(String[] args) {
        SpringApplication.run(StartApplication.class, args);
    }
  
    @Bean
    public BeanUtil beanUtil() {
        return new BeanUtil();
    }
}

public class MyUtils {
   
    public static UserDetails getCurrentUser() {
        MyUserDetailsService userDetailsService = BeanUtil.getBean(MyUserDetailsService.class);
        //TODO 调用service中的方法处理自己的业务
        return null;
    }
}

package com.bonc.springboot.utils;
/*
 * @desc:提供非SPRING管理类调用管理类的功能
 * 注意在服务启动的时候进行import,apllication中引入
 */
import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
public class SpringUtil implements ApplicationContextAware {
       private static ApplicationContext applicationContext = null;
       @Override
 
       public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
 
              if(SpringUtil.applicationContext == null){
                     SpringUtil.applicationContext  = applicationContext;
              }
              System.out.println("---------------------------------------------------------------------");
              System.out.println("========ApplicationContext配置成功,在普通类可以通过调用SpringUtils.getAppContext()获取applicationContext对象,applicationContext="+SpringUtil.applicationContext+"========");
              System.out.println("---------------------------------------------------------------------");
       }
     
       //获取applicationContext
       public static ApplicationContext getApplicationContext() {
              return applicationContext;
       }
      
       //通过name获取 Bean.
       public static Object getBean(String name){
              return getApplicationContext().getBean(name);
       }
 
       //通过class获取Bean.
       public static <T> T getBean(Class<T> clazz){
              return getApplicationContext().getBean(clazz);
       }
 
       //通过name,以及Clazz返回指定的Bean
       public static <T> T getBean(String name,Class<T> clazz){
              return getApplicationContext().getBean(name, clazz);
       }
}

ApplicationContext appCtx = SpringUtil.getApplicationContext();
public  TestDao dao = appCtx.getBean(TestDao.class);

public  TestDao dao = SpringUtil.getBean(TestDao.class);

//普通类进行构造的时候，可以调用dao 对象
@RequestMapping(value="/testClassQuery")
public  void  testClassQuery(){
  TestClassQuery testClassQuery =new TestClassQuery();
}

**
 * @Description: 测试普通类如何调用mapper
 */
 
public  class TestClassQuery {
    ApplicationContext appCtx = SpringUtil.getApplicationContext();
    public  TestDao dao = appCtx.getBean(TestDao.class);
 
    private  User user;
 
    public User getUser() {
        return user;
    }
    public void setUser(User user) {
        this.user = user;
    }
 
    public  TestClassQuery(){
        testQuery();
    }
 
    public  void testQuery(){
        user = dao.queryUser("1"); //通过id获取值
        System.out.println(user.toString());
    }
}