静态方法中调用service层空指针异常解决方法

注意事项:

1. 静态方法中只能调用静态成员和静态方法
2. 如果使用@autowired或者@resource注解自动注入，所定义的静态成员service为null, 无法实现直接注入对象

静态方法调用service报空指针解决方案:

1. 工具类需要实现初始化接口,并交给spring管理
2. 创建静态成员变量service
3. 创建公共成员变量service,并实现自动注入
4. 重写初始化方法,在方法里将公共成员变量赋值给静态成员变量

import org.springframework.beans.factory.InitializingBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

@Component
public class BasicController implements InitializingBean {
	// 静态成员变量
	private static ZnChuangxinPersonService staticChuangxinPersonService;
	private static ZnChuangxinOrgService staticChuangxinOrgService;
	// 公共成员变量
	@Autowired
	private ZnChuangxinPersonService znChuangxinPersonService;
	@Autowired
	private ZnChuangxinOrgService znChuangxinOrgService;

	// 重写初始化方法
    @Override
	public void afterPropertiesSet() throws Exception {
		staticChuangxinOrgService = znChuangxinOrgService;
		staticChuangxinPersonService = znChuangxinPersonService;
	}

	// 静态方法中调用service
	public static String getCurrentUnionId() {
		String loginName = getCurrentUserLoginName();
		ZnChuangxinPerson person = staticChuangxinPersonService.fingByJobNum(loginName);
		ZnChuangxinOrg org = staticChuangxinOrgService.getOne(person.getCxorgId().getId());
		return org == null ? "" : org.getUnionId();
	}

}