spring項目使用多線程時對象注入的問題

由於最近在寫的項目需要使用到多線程提升效率，但是我在線程中調用注入對象的時候卻發現始終爲空，下面是我如何解決這個問題的方法。

原因分析

new thread對象不在spring容器中，所以無法通過@Autoware獲去到spring的bean對象。

解決辦法

爲了解決這個問題，有以下幾個思路

1. 在聲明成員變量的時候，將其定義爲static的。這樣都可以調用到
2. 可以通過手動的方式獲取
3. 可以通過參數直接傳入

重點講解第二個方法

//創建一個工具類來獲取Bean：
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);
	}
}

//創建thread
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);
        User user=testService.queryUserById(11);
    }
 
    public User getUser() {
        return user;
    }
 
    public void setUser(User user) {
        this.user = user;
    }
}

//其他service調用
ThreadFactory namedThreadFactory = new ThreadFactoryBuilder().setNameFormat("upFinancial-pool-%d").build();
            ExecutorService pool = new ThreadPoolExecutor(corePoolSize, maxPoolSize,
                    6000L, TimeUnit.MILLISECONDS,
                    new LinkedBlockingDeque<Runnable>(1024), namedThreadFactory, new ThreadPoolExecutor.AbortPolicy());
            UpFinancialContractHandler handler=new UpFinancialContractHandler();
            handler.setUser(user);
            pool.execute(handler);