java - 如何在Spring 3.0中注入(inject) map 类型对象

在DAO中：

private Map<Integer,String> departments = new LinkedHashMap<Integer, String>();

@Override
public List<DepartmentEntity> getAllDepartments() {
    return this.sessionFactory.getCurrentSession().createQuery("from DepartmentEntity de order by LOWER(de.departmentname)").list();

}

@Override
public Map<Integer, String> loadDepartments() {
    departments.clear();
    for (DepartmentEntity de : getAllDepartments())
        departments.put(de.getDepartmentid(), de.getDepartmentname());
    return departments;
}

它的工作正常，但在春季手动创建对象时，其错误代码

private Map<Integer,String> departments;

因此，在我的情况下，如何从外部注入LinkedHashMap类型的地图对象？

我试过但是我得到了像空指针异常这样的异常

请任何人帮助我..

最佳答案

 <util:map id="myMap" map-class="java.util.LinkedHashMap" key-type="java.lang.Integer" value-type="java.lang.String"/>

<bean id="departmentDAOImpl" class="com.leadwinner.infra.assets.dao.DepartmentDAOImpl">
    <property name="departments" ref="myMap"></property>
</bean>