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);
    }

}