Spring中的集合的注入方式

摘要: 在Spring中可以装配4种集合类型属性：List、set、Map和Properties。介绍如何装配集合属性,还有一个数组

上代码 bean.xml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"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd"> 
<bean id="collectionBean" class="org.heinrich.CollectionBean">
<property name="sets">
<set>
<value>Heinrich</value>
<value>Reading Thinking Java</value>
</set>
</property>
<property name="users">
<list>
<ref bean="user1"/>
<ref bean="user2"/>
</list>
</property>
<property name="maps">
<map>
<entry key="BookName">
<value>Thinking Java</value>
</entry>
<entry key="PhoneName">
<value>Apple 6 plus</value>
</entry>
</map>
</property>
<property name="properties">
<props>
<prop key="1">MySQL</prop>
<prop key="2">Oracle</prop>
<prop key="3">SQLSERVER</prop>
</props>
</property>
</bean>

<bean id="user1" class="org.heinrich.User">
<property name="name">
<value>Heinrich</value>
</property>
<property name="age">
<value>21</value>
</property>
</bean>
<bean id="user2" class="org.heinrich.User">
<property name="name">
<value>Zhangyanmei</value>
</property>
<property name="age">
<value>22</value>
</property>
</bean>
</beans>

package org.heinrich;

public class User {

private String name;
private Integer age;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}

}

上面是实体类User,下面是需要注入的实体类

package org.heinrich;

import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.Set;

public class CollectionBean {

private List<User> users;
private Map<String,String> maps;
private Set<String> sets;
private Properties properties;
public List<User> getUsers() {
return users;
}
public void setUsers(List<User> users) {
this.users = users;
}
public Map<String, String> getMaps() {
return maps;
}
public void setMaps(Map<String, String> maps) {
this.maps = maps;
}
public Set<String> getSets() {
return sets;
}
public void setSets(Set<String> sets) {
this.sets = sets;
}
public Properties getProperties() {
return properties;
}
public void setProperties(Properties properties) {
this.properties = properties;
}

}

测试类

package org.heinrich;

import org.springframework.context.support.ClassPathXmlApplicationContext;

public class BeanTest {

public static void main(String[] args) {

ClassPathXmlApplicationContext ctx = new ClassPathXmlApplicationContext("bean.xml");
User user1 = (User)ctx.getBean("user1");
User user2 = (User)ctx.getBean("user1");
System.out.println(user1);
System.out.println(user2);
CollectionBean collectionBean = (CollectionBean)ctx.getBean("collectionBean");
System.out.println(collectionBean);
System.out.println(collectionBean.getMaps());
System.out.println(collectionBean.getSets());
System.out.println(collectionBean.getUsers());
System.out.println(collectionBean.getProperties());

}

}

测试结果

org.heinrich.User@f8dd88b
org.heinrich.User@f8dd88b
org.heinrich.CollectionBean@298395a7
{BookName=Thinking Java, PhoneName=Apple 6 plus}
[Heinrich, Reading Thinking Java]
[org.heinrich.User@f8dd88b, org.heinrich.User@7dd61c3b]
{3=SQLSERVER, 2=Oracle, 1=MySQL}