这篇文章来谈谈《Spring Framework 开发参考手册》的3.3.2小节中的集合对象注入。
在项目开发中，还是经常会用到集合对象注入的，不过感觉没有多少需要介绍的，这次就只给出实例了。
· 先建立一个包：javamxj.spring.basic.collections ，然后把以下4个文件放在这个包下。
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Hello.java |
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package javamxj.spring.basic.collections;
public class Hello {
public String toString() {
return "这是一个bean";
}
} |
package javamxj.spring.basic.collections;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.Set;
public class CollectionInjection {
private Map someMap;
private Properties someProps;
private Set someSet;
private List someList;
public void setSomeProps(Properties someProps) {
this.someProps = someProps;
}
public void setSomeList(List someList) {
this.someList = someList;
}
public void setSomeMap(Map someMap) {
this.someMap = someMap;
}
public void setSomeSet(Set someSet) {
this.someSet = someSet;
}
public void displayInfo() {
System.out.println("Map contents:");
for (Object key : someMap.keySet()) {
System.out.println("Key: " + key + " - Value: " + someMap.get(key));
}
System.out.println("\nProperties contents:");
for (Object key : someProps.keySet()) {
System.out.println("Key: " + key + " - Value: "
+ someProps.get(key));
}
System.out.println("\nSet contents:");
for (Object i : someSet) {
System.out.println("Value: " + i);
}
System.out.println("\nList contents:");
for (Object i : someList) {
System.out.println("Value: " + i);
}
}
}
<?xml version="1.0" encoding="GBK"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN"
"http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
<bean id="hello" class="javamxj.spring.basic.collections.Hello"/>
<bean id="injectCollection"
class="javamxj.spring.basic.collections.CollectionInjection">
<property name="someMap">
<map>
<entry key="someValue" value="Hello javamxj!"/>
<entry key="someBean">
<ref local="hello"/>
</entry>
</map>
</property>
<property name="someProps">
<props>
<prop key="姓">张</prop>
<prop key="名">小小</prop>
</props>
</property>
<property name="someSet">
<set>
<value>Hello World!</value>
<ref local="hello"/>
</set>
</property>
<property name="someList">
<list>
<value>Hello World!</value>
<ref local="hello"/>
</list>
</property>
</bean>
</beans>
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Main.java |
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package javamxj.spring.basic.collections;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.xml.XmlBeanFactory;
import org.springframework.core.io.ClassPathResource;
public class Main {
public static void main(String[] args) {
BeanFactory bf= new XmlBeanFactory(new ClassPathResource(
"javamxj/spring/basic/collections/beans.xml"));
CollectionInjection c = (CollectionInjection)bf.getBean("injectCollection");
c.displayInfo();
}
} |
·运行Main.java，输出结果如下：
Map contents:
Key: someValue - Value: Hello javamxj!
Key: someBean - Value: 这是一个bean
Properties contents:
Key: 姓 - Value: 张
Key: 名 - Value: 小小
Set contents:
Value: Hello World!
Value: 这是一个bean
List contents:
Value: Hello World!
Value: 这是一个bean
这篇文章源代码下载（不包含库文件）：http://free.ys168.com/?javamxj Spring目录下面的SpringBasic.zip。
注意： 需要使用JDK 5。 |
