问题：springmvc给静态变量注入报：@Autowired annotation is not supported on static fields
原因：spring annotation不支持静态变量注入

解决：
方法一：把get,set方法的static修饰符去掉，然后在set方法上面加@Autowired即可

public class EnDecryptionServiceImpl implements IEnDecryptionService{
    /** 阿里云OSS配置查询 */
    private static OSSConfMapper ossConfMapper;
    /** 阿里云OSS图片上传 */
    private static UploadImgOSS uploadImgOSS;
    public  OSSConfMapper getOssConfMapper() {
        return ossConfMapper;
    }
    @Autowired
    public void setOssConfMapper(OSSConfMapper ossConfMapper) {
        UploadUtil.ossConfMapper = ossConfMapper;
    }
    public  UploadImgOSS getUploadImgOSS() {
        return uploadImgOSS;
    }
    @Autowired
    public void setUploadImgOSS(UploadImgOSS uploadImgOSS) {
        UploadUtil.uploadImgOSS = uploadImgOSS;
    }
}

方法二：在构造函数上加上@Autowired

  /**
   * 第二种解决 Autowired annotation is not supported on static fields的方式
   */
    @Autowired
    public void EnDecryptionServiceTwoImpl(OSSConfMapper ossConfMapper,UploadImgOSS uploadImgOSS) {
        ossConfMapper=ossConfMapper;
        uploadImgOSS=uploadImgOSS;
        log.info(xxx);
        init();
    }

Spring静态注入的三种方式

1. xml方式
   适合基于XML配置的WEB项目

<bean id="mongoFileOperationUtil" class="com.*.*.MongoFileOperationUtil" init-method="init">  
    <property name="dsForRW" ref="dsForRW"/>  
</bean> 

2. @PostConstruct方式

import org.mongodb.morphia.AdvancedDatastore;  
import org.springframework.beans.factory.annotation.Autowired;  
  
  
@Component  
public class MongoFileOperationUtil {  
    @Autowired  
    private static AdvancedDatastore dsForRW;  
  
    private static MongoFileOperationUtil mongoFileOperationUtil;  
  
    @PostConstruct  
    public void init() {  
        mongoFileOperationUtil = this;  
        mongoFileOperationUtil.dsForRW = this.dsForRW;  
    }  
  
}

@PostConstruct 注解的方法在加载类的构造函数之后执行，也就是在加载了构造函数之后，执行init方法；(@PreDestroy 注解定义容器销毁之前的所做的操作)
这种方式和在xml中配置 init-method和 destory-method方法差不多，定义spring 容器在初始化bean 和容器销毁之前的所做的操作

3. set方法上添加@Autowired注解，类定义上添加@Component注解

import org.mongodb.morphia.AdvancedDatastore;  
import org.springframework.beans.factory.annotation.Autowired;  
import org.springframework.stereotype.Component;  
  
@Component  
public class MongoFileOperationUtil {    
    private static AdvancedDatastore dsForRW;  
      
    @Autowired  
    public void setDatastore(AdvancedDatastore dsForRW) {  
        MongoFileOperationUtil.dsForRW = dsForRW;  
    }  
}  

首先Spring要能扫描到AdvancedDatastore的bean，然后通过setter方法注入；
然后注意：成员变量上不需要再添加@Autowired注解；