实例
假设我们拥有一个运行良好的Eclipse IDE，并采取以下步骤来创建一个Spring应用程序：
- 创建一个名称为SpringExample的项目，并在创建的项目的src文件夹下创建一个包com.jc2182
- 使用“添加外部JAR”选项添加所需的Spring库，如“Spring Hello World示例”一章中所述。
- 在com.jc2182包下创建Java类JavaCollection和MainApp。
- 在src文件夹下创建Beans配置文件Beans.xml。
- 最后一步是创建所有Java文件和Bean配置文件的内容，然后按以下说明运行应用程序。
以下是JavaCollection.java的内容。
package com.jc2182;
import java.util.*;
public class JavaCollection {
List addressList;
Set addressSet;
Map addressMap;
Properties addressProp;
// a setter method to set List
public void setAddressList(List addressList) {
this.addressList = addressList;
}
// prints and returns all the elements of the list.
public List getAddressList() {
System.out.println("List Elements :" + addressList);
return addressList;
}
// a setter method to set Set
public void setAddressSet(Set addressSet) {
this.addressSet = addressSet;
}
// prints and returns all the elements of the Set.
public Set getAddressSet() {
System.out.println("Set Elements :" + addressSet);
return addressSet;
}
// a setter method to set Map
public void setAddressMap(Map addressMap) {
this.addressMap = addressMap;
}
// prints and returns all the elements of the Map.
public Map getAddressMap() {
System.out.println("Map Elements :" + addressMap);
return addressMap;
}
// a setter method to set Property
public void setAddressProp(Properties addressProp) {
this.addressProp = addressProp;
}
// prints and returns all the elements of the Property.
public Properties getAddressProp() {
System.out.println("Property Elements :" + addressProp);
return addressProp;
}
}
以下是MainApp.java文件的内容。
package com.jc2182;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class MainApp {
public static void main(String[] args) {
ApplicationContext context = new ClassPathXmlApplicationContext("Beans.xml");
JavaCollection jc=(JavaCollection)context.getBean("javaCollection");
jc.getAddressList();
jc.getAddressSet();
jc.getAddressMap();
jc.getAddressProp();
}
}
以下是配置文件Beans.xml，它具有所有集合类型的配置
<?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-3.0.xsd">
<!-- Definition for javaCollection -->
<bean id = "javaCollection" class = "com.jc2182.JavaCollection">
<!-- results in a setAddressList(java.util.List) call -->
<property name = "addressList">
<list>
<value>CHINA</value>
<value>Pakistan</value>
<value>USA</value>
<value>USA</value>
</list>
</property>
<!-- results in a setAddressSet(java.util.Set) call -->
<property name = "addressSet">
<set>
<value>CHINA</value>
<value>Pakistan</value>
<value>USA</value>
<value>USA</value>
</set>
</property>
<!-- results in a setAddressMap(java.util.Map) call -->
<property name = "addressMap">
<map>
<entry key = "1" value = "CHINA"/>
<entry key = "2" value = "Pakistan"/>
<entry key = "3" value = "USA"/>
<entry key = "4" value = "USA"/>
</map>
</property>
<!-- results in a setAddressProp(java.util.Properties) call -->
<property name = "addressProp">
<props>
<prop key = "one">CHINA</prop>
<prop key = "one">CHINA</prop>
<prop key = "two">Pakistan</prop>
<prop key = "three">USA</prop>
<prop key = "four">USA</prop>
</props>
</property>
</bean>
</beans>
完成创建源和Bean配置文件后，让我们运行该应用程序。如果您的应用程序一切正常，它将显示以下消息：
List Elements :[CHINA, Pakistan, USA, USA]
Set Elements :[CHINA, Pakistan, USA]
Map Elements :{1=CHINA, 2=Pakistan, 3=USA, 4=USA}
Property Elements :{two=Pakistan, one=CHINA, three=USA, four=USA}
