详解SpringBoot 多线程处理任务 无法@Autowired注入bean问题解决
在多线程处理问题时,无法通过@Autowired注入bean,报空指针异常,
在线程中为了线程安全,是防注入的,如果要用到这个类,只能从bean工厂里拿个实例。
解决方法如下:
1.创建一个工具类代码:
package com.hqgd.pms.common; 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: yaorong * @CreateDate: 2018/12/10 */ @Component public class SpringContextUtil implements ApplicationContextAware { /** * 上下文对象实例 */ private static ApplicationContext applicationContext; @Override public void setApplicationContext(ApplicationContext applicationContext) throws BeansException { SpringContextUtil.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); } }
2.使用方法
@Slf4j @Service public class SerialPortService { public static SerialPort mSerialport = null; // private SimpMessagingTemplate simpMessage; private DataAcquisitionService das; private SystemService systemService; private SysParamMapper sysParamMapper; public SerialPortService() { this.das = SpringContextUtil.getBean(DataAcquisitionService.class); this.systemService = SpringContextUtil.getBean(SystemService.class); this.sysParamMapper = SpringContextUtil.getBean(SysParamMapper.class); } }
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持我们。
赞 (0)