一、原因分析:
在多线程时使用@Autowired总是获取不到bean,原因是:new thread不在spring容器中,也就无法获得spring中的bean对象
二、解决方案:
手动获取
代码实现如下:
package com.test.configs;
import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;
@Component
public class BeanContext implements ApplicationContextAware {
private static ApplicationContext applicationContext;
public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
BeanContext.applicationContext = applicationContext;
}
public static ApplicationContext getApplicationContext(){
return applicationContext;
}
@SuppressWarnings("unchecked")
public static <T> T getBean(String name) throws BeansException {
return (T)applicationContext.getBean(name);
}
public static <T> T getBean(Class<T> clz) throws BeansException {
return (T)applicationContext.getBean(clz);
}
}
线程类中的使用使用方法:
package com.test.handler;
import com.test.configs.BeanContext;
import com.test.service.TestService;
import com.test.model.User;
public class TestHandler implements Runnable {
private User user;
private TestService testService;
@Override
public void run() {
this.testService= BeanContext.getApplicationContext().getBean(TestService.class);
//这里就可以使用service逻辑接口中的方法了
User user=testService.queryUserById(11);
}
public User getUser() {
return user;
}
public void setUser(User user) {
this.user = user;
}
}
若是是监听器类的话,只需要在监听器的执行方法中执行下面的代码就可以实现:
TestService testService= BeanContext.getApplicationContext().getBean(TestService.class);
至此,多线程类中使用调用service接口为null的问题就搞定了!