【spring框架】spring中集合的注入

来源：互联网发布：精灵幻境源码编辑：程序博客网时间：2024/06/05 01:51

集合注入(很少用)
有的时候我们会使用别人提供我们的类，它里面如果有集合的话，在这个时候我们需要把想注的东西注入进去。

通过<list/>、<set/>、<map/>及<props/>元素可以定义和设置与Java Collection类型对应List、Set、Map及Properties的值。
实现：

<bean id="moreComplexObject" class="example.ComplexObject">  <!-- results in a setAdminEmails(java.util.Properties) call -->  <property name="adminEmails">    <props>        <prop key="administrator">administrator@example.org</prop>        <prop key="support">support@example.org</prop>        <prop key="development">development@example.org</prop>    </props>  </property>  <!-- results in a setSomeList(java.util.List) call -->  <property name="someList">    <list>        <value>a list element followed by a reference</value>        <ref bean="myDataSource" />    </list>  </property>  <!-- results in a setSomeMap(java.util.Map) call -->  <property name="someMap">    <map>        <entry>            <key>                <value>an entry</value>            </key>            <value>just some string</value>        </entry>        <entry>            <key>                <value>a ref</value>            </key>            <ref bean="myDataSource" />        </entry>    </map>  </property>  <!-- results in a setSomeSet(java.util.Set) call -->  <property name="someSet">    <set>        <value>just some string</value>        <ref bean="myDataSource" />    </set>  </property></bean>

实例测试:
UserDaoImpl.java:

package cn.edu.hpu.dao.Impl;import java.util.List;import java.util.Map;import java.util.Set;import cn.edu.hpu.dao.UserDao;import cn.edu.hpu.model.User;public class UserDaoImpl implements UserDao{private Set<String> sets;private List<String> lists;private Map<String,String> maps;public Set<String> getSets() {return sets;}public void setSets(Set<String> sets) {this.sets = sets;}public List<String> getLists() {return lists;}public void setLists(List<String> lists) {this.lists = lists;}public Map<String, String> getMaps() {return maps;}public void setMaps(Map<String, String> maps) {this.maps = maps;}public void save(User u) {    System.out.println("add success!!");}        @Overridepublic String toString() {        return "sets size:"+sets.size()+"| lists size:"+lists.size()+"| maps size:"+maps.size()+".";}}

然后在beans.xml中配置:

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"       xsi:schemaLocation="http://www.springframework.org/schema/beans           http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">  <bean id="u" class="cn.edu.hpu.dao.Impl.UserDaoImpl">   <property name="sets">   <set>      <value>1</value>      <value>2</value>   </set>   </property>    <property name="lists">   <list>      <value>1</value>      <value>2</value>      <value>3</value>   </list>   </property>   <property name="maps">   <map>     <entry key="1" value="1"></entry>     <entry key="2" value="2"></entry>     <entry key="3" value="3"></entry>     <entry key="4" value="4"></entry>   </map>   </property>  </bean>  <bean id="userService" class="cn.edu.hpu.service.UserService" >   <constructor-arg>   <ref bean="u"/>   </constructor-arg>  </bean>  </beans>

spring会把这些值读取来，设到我们那些属性中去。

测试:(在UserDaoImpl中改写了toString方法，这里直接打印UserDao对象即可)

@Testpublic void testAdd() throws Exception{BeanFactory ctx=new ClassPathXmlApplicationContext("beans.xml");UserDao uDao=(UserDao)ctx.getBean("u");System.out.println(uDao);}

结果:
sets size:2| lists size:3| maps size:4.

可以看到已经将各种集合注入。

转载请注明出处:http://blog.csdn.net/acmman

0 0