Springboot实现多线程注入bean的工具类操作

场景： 使用springboot多线程，线程类无法自动注入需要的bean

解决方法： 通过工具类获取需要的bean

工具类代码：

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;



@Component
public class ApplicationContextProvider implements ApplicationContextAware {
  
  private static ApplicationContext applicationContext;

  @Override
  public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
    this.applicationContext = applicationContext;
  }

  
  public static ApplicationContext getApplicationContext() {
    return applicationContext;
  }

  
  public static Object getBean(String name) {
    return getApplicationContext().getBean(name);
  }

  
  public static  T getBean(Class clazz) {
    return getApplicationContext().getBean(clazz);
  }

  
  public static  T getBean(String name, Class clazz) {
    return getApplicationContext().getBean(name, clazz);
  }
}

使用方法：

在线程类的构造函数里调用工具类的getBeans方法获取实例，如：

public class ThreadA implements Runnable {
  private Service service;
  public ThreadA() {
    this.service = ApplicationContextProvider.getBean(Service.class);
  }

  @Override
  public void run() {
  //TO BE DONE
  }
}

补充知识：在springboot中普通的线程类访问service类

1、首先在线程类上注解@Component

2、@Autowired

private IStudentService studentService;

3、调用时候

studentService = SpringUtils.getBean("studentService");

4、SpringUtils

package com.ruoyi.common.utils.spring;
 
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.NoSuchBeanDefinitionException;
import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;
 

@Component
public final class SpringUtils implements BeanFactoryPostProcessor, ApplicationContextAware
{
  
  private static ConfigurableListableBeanFactory beanFactory;
  private static ApplicationContext applicationContext = null;
 
  @Override
  public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException
  {
    SpringUtils.beanFactory = beanFactory;
  }
 
  
  @SuppressWarnings("unchecked")
  public static  T getBean(String name) throws BeansException
  {
    return (T) beanFactory.getBean(name);
  }
 
  
  public static  T getBean(Class clz) throws BeansException
  {
    T result = (T) beanFactory.getBean(clz);
    return result;
  }
 
  
  public static boolean containsBean(String name)
  {
    return beanFactory.containsBean(name);
  }
 
  
  public static boolean isSingleton(String name) throws NoSuchBeanDefinitionException
  {
    return beanFactory.isSingleton(name);
  }
 
  
  public static Class getType(String name) throws NoSuchBeanDefinitionException
  {
    return beanFactory.getType(name);
  }
 
  
  public static String[] getAliases(String name) throws NoSuchBeanDefinitionException
  {
    return beanFactory.getAliases(name);
  }
 
  @Override
  public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
    if(SpringUtils.applicationContext == null){
      SpringUtils.applicationContext = applicationContext;
    } 
  }
 
  //获取applicationContext
  public static ApplicationContext getApplicationContext() {
    return applicationContext;
  } 
}

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