之前的例子比較簡單，打算了解一下Spring的基本用法。Spring的依賴注入有三種實現方式，常用是setter和construct方式。對于像數組和集合對象注入，注入前必須填充一些對象到集合中，然后再把集合注入到Bean，采用setter方式來完成。
通過一個例子來說明。
導入Spring所需的包：commons-logging.jar，spring.jar 。(日志包和Spring包)
包下載地址：
http://www.ziddu.com/download/3555993/Spring.rar.html
(1)創建ObjectSet類
package com.set;
public class ObjectSet {
private String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String toString()
{
return name;
}
}
(2)創建SomeBean類
package com.set;
import java.util.List;
import java.util.Map;
public class SomeBean {
private String[] someStrArray;
private ObjectSet[] someObjArray;
private List someList;
private Map someMap;
public SomeBean()
{}
public List getSomeList() {
return someList;
}
public void setSomeList(List someList) {
this.someList = someList;
}
public Map getSomeMap() {
return someMap;
}
public void setSomeMap(Map someMap) {
this.someMap = someMap;
}
public ObjectSet[] getSomeObjArray() {
return someObjArray;
}
public void setSomeObjArray(ObjectSet[] someObjArray) {
this.someObjArray = someObjArray;
}
public String[] getSomeStrArray() {
return someStrArray;
}
public void setSomeStrArray(String[] someStrArray) {
this.someStrArray = someStrArray;
}
}
(3)在類路徑下，創建set-config.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
<bean id="first_object" class="com.set.ObjectSet" >
<property name="name">
<value>ducklyl</value>
</property>
</bean>
<bean id="second_object" class="com.set.ObjectSet" >
<property name="name">
<value>wangsp</value>
</property>
</bean>
<bean id="someBean" class="com.set.SomeBean" >
<property name="someStrArray">
<list>
<value>Hello</value>
<value>Welcome</value>
</list>
</property>
<property name="someObjArray">
<list>
<ref bean="first_object"/>
<ref bean="second_object"/>
</list>
</property>
<property name="someList">
<list>
<value>ListTest</value>
<ref bean="first_object"/>
<ref bean="second_object"/>
</list>
</property>
<property name="someMap">
<map>
<entry key="first">
<value>Hello,ducklyl!</value>
</entry>
<entry key="second">
<ref bean="first_object"/>
</entry>
</map>
</property>
</bean>
</beans>
(4)創建測試類SpringTest
package com.set;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.FileSystemXmlApplicationContext;
import java.util.*;
public class SpringTest {
public static void main(String[] args)
{
//讀取配置文件
ApplicationContext context=new FileSystemXmlApplicationContext("set-config.xml");
//獲取id="setBean"對象
SomeBean someBean=(SomeBean)context.getBean("someBean");
//獲取someStrArray,someObjArray
String[] strs=someBean.getSomeStrArray();
ObjectSet[] some=someBean.getSomeObjArray();
for(int i=0;i<strs.length;i++)
System.out.println(strs[i]+","+some[i]);
//獲取someList
List someList=(List)someBean.getSomeList();
for(int i=0;i<someList.size();i++)
System.out.println(someList.get(i));
//獲取someMap
Map someMap=someBean.getSomeMap();
System.out.println(someMap);
}
}
如果以上配置正確，運行測試程序，結果如下：
Hello,ducklyl
Welcome,wangsp
ListTest
ducklyl
wangsp
{first=Hello,ducklyl!, second=ducklyl}