快速上手Spring--8. 集合對象注入 這篇文章來(lái)談?wù)?a target="_blank" >《Spring Framework 開(kāi)發(fā)參考手冊》的3.3.2小節中的集合對象注入。
在項目開(kāi)發(fā)中，還是經(jīng)常會(huì )用到集合對象注入的，不過(guò)感覺(jué)沒(méi)有多少需要介紹的，這次就只給出實(shí)例了。
· 先建立一個(gè)包：javamxj.spring.basic.collections ，然后把以下4個(gè)文件放在這個(gè)包下。
Hello.java
package javamxj.spring.basic.collections;
public class Hello {
public String toString() {
return "這是一個(gè)bean";
}
}
CollectionInjection.java
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);
}
}
}
beans.xml
<?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">張</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>
Main.java
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();
}
}
·運行Main.java，輸出結果如下：
Map contents:
Key: someValue - Value: Hello javamxj!
Key: someBean - Value: 這是一個(gè)bean
Properties contents:
Key: 姓 - Value: 張
Key: 名 - Value: 小小
Set contents:
Value: Hello World!
Value: 這是一個(gè)bean
List contents:
Value: Hello World!
Value: 這是一個(gè)bean
這篇文章源代碼下載（不包含庫文件）：
http://free.ys168.com/?javamxj Spring目錄下面的SpringBasic.zip。
注意： 需要使用JDK 5。
