在Spring中所谓的内部bean(inner bean)是指一个bean 的<property/>或<constructor-arg/>元素中使用<bean/>元素定义的bean．内部bean 定义不需要有id或name属性，即使指定id或name属性值也将会被容器忽略．
在Spring中通过<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．
以下是个关于内部bean和集合的例子.
applicationContext.xml文件:
======================================================<?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-2.0.xsd ">
<!--
注：如果此处是Action的对象,则只能用name而不能用id
-->
<bean name="/login" class="action.LoginAction">
<property name="loginBiz">
<ref local="loginBiz" />
</property>
</bean>
<bean id="loginBiz" class="biz.LoginImpl">
<property name="haha">
<!--
对应的haha在biz.LoginImpl类中为数组(注:如果属性为List则在applicationContext.xml文件中也应用list节点)
-->
<list>
<value>aa</value>
<value>bb</value>
<value>cc</value>
<value>dd</value>
</list>
</property>
<property name="h">
<!--
此处为内部bean,即h的类型为biz.ha类型的引用
-->
<bean class="biz.ha">
<!--
biz.ha类中有三个属性，分别为name(String类型),age(int类型)和map(Map类型)
-->
<property name="name" value="李四" />
<property name="age" value="55" />
<property name="map">
<!--
map在biz.ha类中我Map集合
-->
<map>
<!--
每一个entry为一个Map元素
-->
<entry>
<key>
<value>hehe</value>
</key>
<value>hei</value>
</entry>
</map>
</property>
</bean>
</property>
<!--
<constructor-arg type="java.lang.String">
<value>张三</value>
</constructor-arg>
-->
<constructor-arg index="0">
<value>张三</value>
</constructor-arg>
<!--
<constructor-arg type="int">
<value>55</value>
</constructor-arg>
-->
<constructor-arg index="1">
<value>55</value>
</constructor-arg>
</bean>
</beans>
=================================================
LoginAction类中的代码
=================================================
/*
* Generated by MyEclipse Struts
* Template path: templates/java/JavaClass.vtl
*/
package action;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import biz.ILoginBiz;
import form.LoginForm;
public class LoginAction extends Action {
private ILoginBiz loginBiz;
public ILoginBiz getLoginBiz() {
return loginBiz;
}
public void setLoginBiz(ILoginBiz loginBiz) {
this.loginBiz = loginBiz;
}
public ActionForward execute(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response) {
LoginForm loginForm = (LoginForm) form;// TODO Auto-generated method stub
System.out.println("haha 我己在action中了哈...");
loginBiz.login();
return null;
}
}
======================================
业务层(biz)中的ILoginBiz接口
======================================
package biz;
public interface ILoginBiz {
public void login();
}
======================================
业务层(biz)中实同ILoginBiz接口的LoginImpl类
======================================
package biz;
public class LoginImpl implements ILoginBiz {
public LoginImpl() {
}
private ha h;/////////////////////////////////////////////////////依赖下一个类呐．．．．
public LoginImpl(String name, int age) {
System.out.println("我的名称:" + name + "我的年龄:" + age);
}
private String haha[];
public void login() {
System.out.println("haha me is 在业务层中呐。。。快来找我呐。。。哈哈。。。");
System.out.println("我的数组中有" + haha.length + "个数....哈哈。。。");
System.out.println("我是内部bean呐．．不错!!!"+"我的名字叫:"+h.getName()+"嘿嘿...不好意思哈．．．．");
System.out.println("嘿嘿．．．我是Map呐．．你好么？嘿嘿．．"+h.getMap().get("hehe"));
}
public String[] getHaha() {
return haha;
}
public void setHaha(String[] haha) {
this.haha = haha;
}
public ha getH() {
return h;
}
public void setH(ha h) {
this.h = h;
}
}
=================================
LoginImpl类中h属性所依赖的类
=================================
package biz;
import java.util.Map;
public class ha {
private String name;
private int age;
private Map map;
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Map getMap() {
return map;
}
public void setMap(Map map) {
this.map = map;
}
}
本文转自左正博客园博客，原文链接：http://www.cnblogs.com/soundcode/archive/2010/12/20/1911899.html，如需转载请自行联系原作者
