Spring学习(八)-----Spring注入值到集合类型的例子

本文内容纲要:

- Spring beans

- 1. List示例

- 2. Set示例

- 3. Map示例

- 4. Properties示例

下面例子向您展示Spring如何注入值到集合类型(List, Set, Map, and Properties)。 支持4个主要的集合类型:

  • List –
  • Set –
  • Map –
  • Properties –

Spring beans

一个Customer对象,有四个集合属性。

package com.yiibai.common;

import java.util.List;

import java.util.Map;

import java.util.Properties;

import java.util.Set;

public class Customer

{

private List<Object> lists;

private Set<Object> sets;

private Map<Object, Object> maps;

private Properties pros;

//...

}

在bean配置文件中不同的代码片段用来声明集合。

1. List示例

<property name="lists">

<list>

<value>1</value>

<ref bean="PersonBean" />

<bean class="com.yiibai.common.Person">

<property name="name" value="yiibaiList" />

<property name="address" value="Hainan" />

<property name="age" value="28" />

</bean>

</list>

</property>

2. Set示例

<property name="sets">

<set>

<value>1</value>

<ref bean="PersonBean" />

<bean class="com.yiibai.common.Person">

<property name="name" value="yiibaiSet" />

<property name="address" value="Hainan" />

<property name="age" value="28" />

</bean>

</set>

</property>

3. Map示例

<property name="maps">

<map>

<entry key="Key 1" value="1" />

<entry key="Key 2" value-ref="PersonBean" />

<entry key="Key 3">

<bean class="com.yiibai.common.Person">

<property name="name" value="yiibaiMap" />

<property name="address" value="Hainan" />

<property name="age" value="28" />

</bean>

</entry>

</map>

</property>

4. Properties示例

<property name="pros">

<props>

<prop key="admin">admin@yiibai.com</prop>

<prop key="support">support@yiibai.com</prop>

</props>

</property>

Spring完整的 bean 配置文件。

<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="CustomerBean" class="com.yiibai.common.Customer">

<!-- java.util.List -->

<property name="lists">

<list>

<value>1</value>

<ref bean="PersonBean" />

<bean class="com.yiibai.common.Person">

<property name="name" value="yiibaiList" />

<property name="address" value="Hainan Haikou" />

<property name="age" value="28" />

</bean>

</list>

</property>

<!-- java.util.Set -->

<property name="sets">

<set>

<value>1</value>

<ref bean="PersonBean" />

<bean class="com.yiibai.common.Person">

<property name="name" value="yiibaiSet" />

<property name="address" value="Hainan Haikou" />

<property name="age" value="28" />

</bean>

</set>

</property>

<!-- java.util.Map -->

<property name="maps">

<map>

<entry key="Key 1" value="1" />

<entry key="Key 2" value-ref="PersonBean" />

<entry key="Key 3">

<bean class="com.yiibai.common.Person">

<property name="name" value="yiibaiMap" />

<property name="address" value="Hainan Haikou" />

<property name="age" value="28" />

</bean>

</entry>

</map>

</property>

<!-- java.util.Properties -->

<property name="pros">

<props>

<prop key="admin">admin@yiibai.com</prop>

<prop key="support">support@yiibai.com</prop>

</props>

</property>

</bean>

<bean id="PersonBean" class="com.yiibai.common.Person">

<property name="name" value="yiibai1" />

<property name="address" value="Hainan Haikou 1" />

<property name="age" value="28" />

</bean>

</beans>

执行程序:

package com.yiibai.common;

import org.springframework.context.ApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;

public class App

{

public static void main( String[] args )

{

ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");

Customer cust = (Customer)context.getBean("CustomerBean");

System.out.println(cust);

}

}

输出

Customer [lists=[1, com.yiibai.common.Person@4e4ee70b, com.yiibai.common.Person@1e1867d2], sets=[1, com.yiibai.common.Person@4e4ee70b, com.yiibai.common.Person@52f644b4], maps={Key 1=1, Key 2=com.yiibai.common.Person@4e4ee70b, Key 3=com.yiibai.common.Person@54481b6d}, pros={admin=admin@yiibai.com, support=support@yiibai.com}]

 

本文内容总结:Spring beans,1. List示例,2. Set示例,3. Map示例,4. Properties示例,

原文链接:https://www.cnblogs.com/zy-jiayou/p/7699831.html

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