Spring笔记之二（Collection Injection）

转贴处 http://www.blogjava.net/improviser/archive/2007/09/24/147710.html

通过<list/>,<set/>,<map/>以及<props/>元素定义和设置与java collection类型对应的List，Set，Map，Rproperties的值。

<!--<br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> -->1importjava.util.Iterator;
2importjava.util.List;
3importjava.util.Map;
4importjava.util.Properties;
5importjava.util.Set;
6
7importorg.springframework.beans.factory.BeanFactory;
8importorg.springframework.beans.factory.xml.XmlBeanFactory;
9importorg.springframework.core.io.FileSystemResource;
10
11publicclassCollectionInjection{
12
13privateMapmap;
14
15privatePropertiesprops;
16
17privateSetset;
18
19privateListlist;
20
21publicstaticvoidmain(String[]args){
22BeanFactoryfactory=newXmlBeanFactory(newFileSystemResource(
23"src/applicationContext.xml"));
24
25CollectionInjectioninstance=(CollectionInjection)
factory.getBean("injectCollection");
26instance.displayInfo();
27}
28
29publicvoidsetList(Listlist){
30this.list=list;
31}
32
33publicvoidsetSet(Setset){
34this.set=set;
35}
36
37publicvoidsetMap(Mapmap){
38this.map=map;
39}
40
41publicvoidsetProps(Propertiesprops){
42this.props=props;
43}
44
45publicvoiddisplayInfo(){
46
47//displaytheMap
48Iteratori=map.keySet().iterator();
49
50System.out.println("Mapcontents:/n");
51while(i.hasNext()){
52Objectkey=i.next();
53System.out.println("Key:"+key+"-Value:"+map.get(key));
54}
55
56//displaytheproperties
57i=props.keySet().iterator();
58System.out.println("/nPropertiescontents:/n");
59while(i.hasNext()){
60Stringkey=i.next().toString();
61System.out.println("Key:"+key+"-Value:"
62+props.getProperty(key));
63}
64
65//displaytheset
66i=set.iterator();
67System.out.println("/nSetcontents:/n");
68while(i.hasNext()){
69System.out.println("Value:"+i.next());
70}
71
72//displaythelist
73i=list.iterator();
74System.out.println("/nListcontents:/n");
75while(i.hasNext()){
76System.out.println("Value:"+i.next());
77}
78}
79}

<!--<br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> -->

<!--<br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> -->1publicclassRefBean{
2publicStringtoString()
3{
4return"refBean";
5}
6}

<!--<br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> -->1<?xmlversion="1.0"encoding="UTF-8"?>
2<!DOCTYPEbeansPUBLIC"-//SPRING//DTDBEAN//EN"
"http://www.springframework.org/dtd/spring-beans.dtd">
3<beans>
4
5<!--oraclebeanusedforafewexamples-->
6<beanid="refBean"name="refB"class="RefBean"/>
7
8<!--collectioninjectionsamples-->
9<beanid="injectCollection"class="CollectionInjection">
10<propertyname="map">
11<map>
12<entrykey="nameValue">
13<value>gzhb_improviser</value>
14</entry>
15<entrykey="refBeanValue">
16<reflocal="refBean"/>
17</entry>
18</map>
19</property>
20<propertyname="props">
21<props>
22<propkey="firstName">gzhb</prop>
23<propkey="secondName">improviser</prop>
24</props>
25</property>
26<propertyname="set">
27<set>
28<value>gzhb</value>
29<reflocal="refBean"/>
30</set>
31</property>
32<propertyname="list">
33<list>
34<value>improviser</value>
35<reflocal="refBean"/>
36</list>
37</property>
38</bean>
39</beans

<!--<br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> -->importjava.util.Iterator;
importjava.util.List;
importjava.util.Map;
importjava.util.Properties;
importjava.util.Set;

importorg.springframework.beans.factory.BeanFactory;
importorg.springframework.beans.factory.xml.XmlBeanFactory;
importorg.springframework.core.io.FileSystemResource;

publicclassCollectionInjection{

privateMapmap;

privatePropertiesprops;

privateSetset;

privateListlist;

publicstaticvoidmain(String[]args){
BeanFactoryfactory=newXmlBeanFactory(newFileSystemResource(
"src/applicationContext.xml"));

CollectionInjectioninstance=(CollectionInjection)factory.getBean("injectCollection");
instance.displayInfo();
}

publicvoidsetList(Listlist){
this.list=list;
}

publicvoidsetSet(Setset){
this.set=set;
}

publicvoidsetMap(Mapmap){
this.map=map;
}

publicvoidsetProps(Propertiesprops){
this.props=props;
}

publicvoiddisplayInfo(){

//displaytheMap
Iteratori=map.keySet().iterator();

System.out.println("Mapcontents:/n");
while(i.hasNext()){
Objectkey=i.next();
System.out.println("Key:"+key+"-Value:"+map.get(key));
}

//displaytheproperties
i=props.keySet().iterator();
System.out.println("/nPropertiescontents:/n");
while(i.hasNext()){
Stringkey=i.next().toString();
System.out.println("Key:"+key+"-Value:"
+props.getProperty(key));
}

//displaytheset
i=set.iterator();
System.out.println("/nSetcontents:/n");
while(i.hasNext()){
System.out.println("Value:"+i.next());
}

//displaythelist
i=list.iterator();
System.out.println("/nListcontents:/n");
while(i.hasNext()){
System.out.println("Value:"+i.next());
}
}
}

运行结果：
Map contents:

Key: nameValue - Value: gzhb_improviser
Key: refBeanValue - Value: refBean

Properties contents:

Key: secondName - Value: improviser
Key: firstName - Value: gzhb

Set contents:

Value: gzhb
Value: refBean

List contents:

Value: improviser
Value: refBean

注意：map的key或value值，或set的value值不能一下元素：
bean，ref，idref，list，set，map，props，vaues，null

集合合并
Spring2.0支持集合合并，子类Bean实例可以合并和重写抽象父类Bean实例的集合属性。

<!--<br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> -->1.<beans>
2.<beanid="parent"abstract="true"class="example.ComplexObject">
3.<propertyname="pro">
4.<props>
5.<propkey="pro1">pro1</prop>
6.<propkey="pro3">pro3</prop>
7.</props>
8.</property>
9.</bean>
10.<beanid="child"parent="parent">
11.<propertyname="pro">
12.<!--themergeisspecifiedonthe*child*collectiondefinition-->
13.<propsmerge="true">
14.<propkey="pro2">pro2</prop>
15.<propkey="pro3">pro3</prop>
16.</props>
17.</property>
18.</bean>
19.<beans>

通过合并，子bean的pro3值覆盖父bean的值，不同集合类型不能合并，子bean中的merge必须定义，否则出现异常，