@Autowired
private static AdvancedDatastore dsForRW;

1.xml方式实现
这种方式适合基于XML配置的WEB项目；<bean id="mongoFileOperationUtil" class="com.*.*.MongoFileOperationUtil" init-method="init"><property name="dsForRW" ref="dsForRW"/>
</bean>
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public class MongoFileOperationUtil {private static AdvancedDatastore dsForRW;private static MongoFileOperationUtil mongoFileOperationUtil;public void init() {mongoFileOperationUtil = this;mongoFileOperationUtil.dsForRW = this.dsForRW;}}

2.@PostConstruct方式实现import org.mongodb.morphia.AdvancedDatastore;
import org.springframework.beans.factory.annotation.Autowired;@Component
public class MongoFileOperationUtil {@Autowiredprivate static AdvancedDatastore dsForRW;private static MongoFileOperationUtil mongoFileOperationUtil;@PostConstructpublic 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；