場景： 使用springboot多線程，線程類無法自動注入需要的bean
解決方法： 通過工具類獲取需要的bean
工具類代碼：
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import org.springframework.beans.BeansException;import org.springframework.context.ApplicationContext;import org.springframework.context.ApplicationContextAware;import org.springframework.stereotype.Component;/** * @Description: 獲取bean對象的工具類 * @Author: Zhang Lin * @CreateDate: 2018/12/10 */@Componentpublic class ApplicationContextProvider implements ApplicationContextAware { /** * 上下文對象實例 */ private static ApplicationContext applicationContext; @Override public void setApplicationContext(ApplicationContext applicationContext) throws BeansException { this.applicationContext = applicationContext; } /** * 獲取applicationContext * * @return */ public static ApplicationContext getApplicationContext() { return applicationContext; } /** * 通過name獲取 Bean. * * @param name * @return */ public static Object getBean(String name) { return getApplicationContext().getBean(name); } /** * 通過class獲取Bean. * * @param clazz * @param <T> * @return */ public static <T> T getBean(Class<T> clazz) { return getApplicationContext().getBean(clazz); } /** * 通過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：
在線程類的構造函數里調用工具類的getBeans方法獲取實例，如：
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public class ThreadA implements Runnable { private Service service; public ThreadA() { this.service = ApplicationContextProvider.getBean(Service.class); } @Override public void run() { //TO BE DONE }} |
補充知識：在springboot中普通的線程類訪問service類
1、首先在線程類上注解@Component
2、@Autowired
private IStudentService studentService;
3、調用時候
studentService = SpringUtils.getBean("studentService");
4、SpringUtils
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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工具類 方便在非spring管理環境中獲取bean * * @author ruoyi */@Componentpublic final class SpringUtils implements BeanFactoryPostProcessor, ApplicationContextAware{ /** Spring應用上下文環境 */ private static ConfigurableListableBeanFactory beanFactory; private static ApplicationContext applicationContext = null; @Override public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException { SpringUtils.beanFactory = beanFactory; } /** * 獲取對象 * * @param name * @return Object 一個以所給名字注冊的bean的實例 * @throws org.springframework.beans.BeansException * */ @SuppressWarnings("unchecked") public static <T> T getBean(String name) throws BeansException { return (T) beanFactory.getBean(name); } /** * 獲取類型為requiredType的對象 * * @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包含一個與所給名稱匹配的bean定義，則返回true * * @param name * @return boolean */ public static boolean containsBean(String name) { return beanFactory.containsBean(name); } /** * 判斷以給定名字注冊的bean定義是一個singleton還是一個prototype。 如果與給定名字相應的bean定義沒有被找到，將會拋出一個異常（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 注冊對象的類型 * @throws org.springframework.beans.factory.NoSuchBeanDefinitionException * */ public static Class<?> getType(String name) throws NoSuchBeanDefinitionException { return beanFactory.getType(name); } /** * 如果給定的bean名字在bean定義中有別名，則返回這些別名 * * @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; } } //獲取applicationContext public static ApplicationContext getApplicationContext() { return applicationContext; } } |
以上這篇Springboot實現多線程注入bean的工具類操作就是小編分享給大家的全部內容了，希望能給大家一個參考，也希望大家多多支持服務器之家。
原文鏈接：https://blog.csdn.net/linyixiao88/article/details/84939252
