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;/** * @Description: 获取bean对象的工具类 * @Author: Zhang Lin * @CreateDate: 2018/12/10 */@Componentpublic class ApplicationContextProvider implements ApplicationContextAware { /** * 上下文对象实例 */ private static ApplicationContext applicationContext; @Override public void setApplicationContext(ApplicationContext applicationContext) throws BeansException { this.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); }}

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; /** * spring工具类 方便在非spring管理环境中获取bean * * @author ruoyi */@Componentpublic final class SpringUtils implements BeanFactoryPostProcessor, ApplicationContextAware{ /** Spring应用上下文环境 */ private static ConfigurableListableBeanFactory beanFactory; private static ApplicationContext applicationContext = null; @Override public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException { SpringUtils.beanFactory = beanFactory; } /** * 获取对象 * * @param name * @return Object 一个以所给名字注册的bean的实例 * @throws org.springframework.beans.BeansException * */ @SuppressWarnings("unchecked") public static <T> T getBean(String name) throws BeansException { return (T) beanFactory.getBean(name); } /** * 获取类型为requiredType的对象 * * @param clz * @return * @throws org.springframework.beans.BeansException * */ public static <T> T getBean(Class<T> clz) throws BeansException { T result = (T) beanFactory.getBean(clz); return result; } /** * 如果BeanFactory包含一个与所给名称匹配的bean定义，则返回true * * @param name * @return boolean */ public static boolean containsBean(String name) { return beanFactory.containsBean(name); } /** * 判断以给定名字注册的bean定义是一个singleton还是一个prototype。 如果与给定名字相应的bean定义没有被找到，将会抛出一个异常（NoSuchBeanDefinitionException） * * @param name * @return boolean * @throws org.springframework.beans.factory.NoSuchBeanDefinitionException * */ public static boolean isSingleton(String name) throws NoSuchBeanDefinitionException { return beanFactory.isSingleton(name); } /** * @param name * @return Class 注册对象的类型 * @throws org.springframework.beans.factory.NoSuchBeanDefinitionException * */ public static Class<?> getType(String name) throws NoSuchBeanDefinitionException { return beanFactory.getType(name); } /** * 如果给定的bean名字在bean定义中有别名，则返回这些别名 * * @param name * @return * @throws org.springframework.beans.factory.NoSuchBeanDefinitionException * */ 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; } }

以上这篇Springboot实现多线程注入bean的工具类操作就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持。