spring中props,list,set,map元素的用法

【转】spring中props,list,set,map元素的用法

博客分类：

spring

在spring容器中配置bean，常用到的元素除了<value>和<ref>外，还有<props>、<list>、<set>、<map>，在hibernate等框架的配置文件中我们经常可以见到这些元素，下面是他们的具体用法。

1.<props>元素

<props>创建了一个注入的java.util.Properties元素。例如每个人都有身高、体重等基本信息

Java代码


1 import java.util.Properties;

2

3 public class Person {

4 private Properties basicInfo;

5

6 public void setBasicInfo(Properties basicInfo) {

7 this.basicInfo = basicInfo;

8 }

9 }

配置方式：

Java代码


1 <bean id="person" class="Person">

2 <property name="basicInfo">

3 <props>

4 <!-- 身高 -->

5 <prop key="stature">1.75</prop>

6 <!-- 体重 -->

7 <prop key="avoirdupois">120</prop>

8 </props>

9 </property>

10 </bean>

2.<list>元素

<list>元素对应于java.util.ArrayList.例如每个人都有一些朋友

Java代码


1 package org.hag.flex.model;

2

3 import java.util.List;

4 import java.util.Properties;

5

6 public class Person {

7 private Properties basicInfo;

8 private List friends;

9

10 public void setBasicInfo(Properties basicInfo) {

11 this.basicInfo = basicInfo;

12 }

13

14 public void setFriends(List friends) {

15 this.friends = friends;

16 }

17 }

18

配置该person的朋友有小红、姚明和张三

Java代码


1 <bean id="yaoming" class="Person">

2 <prop key="age">25</prop>

3 <prop key="stature">2.26</prop>

4 <prop key="avoirdupois">140</prop>

5 </bean>

6 <bean id="person" class="Person">

7 <property name="basicInfo">

8 <props>

9 <!-- 身高 -->

10 <prop key="stature">1.75</prop>

11 <!-- 体重 -->

12 <prop key="avoirdupois">120</prop>

13 </props>

14 </property>

15 <property name="firends">

16 <list>

17 <value>xiaohong</value>

18 <ref local="yaoming"/>

19 <value>zhangsan</value>

20 </list>

21 </property>

22 </bean>

3.<set>元素

<set>元素和<list>元素的用法一样，不同的是他注入的是java.util.Set元素。

4.<map>元素

<map>元素用来注入java.util.Map元素。

Java代码


1 <property name="score">

2 <map>

3 <entry key="math" value="150"></entry>

4 <entry key="english" value="140"></entry>

5 <entry key="chinese" value="60"></entry>

6 </map>

7 </property>

4、spring配置里map的value是list配法

Java代码


<map>

<entry key="a">

<list>

<ref bean="b"/>

<ref bean="c"/>

</list>

</entry>

<entry key="d">

<list>

<ref bean="e"/>

</list>

</entry>

</map>

4、<!-- 外部配置文件 -->

Java代码


<!-- 加载jdbc属性文件 -->

<bean id="propertyConfigurer"

class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">

<property name="locations">

<list>

<value>classpath*:config.properties</value>

</list>

</property>

</bean>

<!-- 外部配置文件 -->

<context:property-placeholder location="classpath*:application.properties" />

<!--定义全局连接命名变量 -->

<util:properties id="posmqProperties" location="classpath:/jms/pos-mq-jndi.properties" />

5、查找jndi的方式

Java代码


<bean id="jmsConnectionFactory" class="org.springframework.jndi.JndiObjectFactoryBean">

<property name="jndiName">

<value>java:comp/env/jms/name</value>

</property>

</bean>

Java代码


<!-- MQ 连接工厂 -->

<jee:jndi-lookup id="posMqConnectionFactory" jndi-name="jms/posmq" environment-ref="posmqProperties" />

<!--定义全局连接命名变量 -->

<util:properties id="posmqProperties" location="classpath:/jms/pos-mq-jndi.properties" />

<!-- Jndi -->

<bean id="jndiTemplate"

class="org.springframework.jndi.JndiTemplate">

<property name="environment">

<props>

<prop key="java.naming.factory.initial">

weblogic.jndi.WLInitialContextFactory

</prop>

<prop key="java.naming.provider.url">

t3://192.166.68.44:7001

</prop>

<prop key="java.naming.factory.url.pkgs">

weblogic.jndi.factories

</prop>

</props>

</property>

</bean>

<!-- jms sender -->

<bean id="jmsConnectionFactory"

class="org.springframework.jndi.JndiObjectFactoryBean">

<property name="jndiTemplate" ref="jndiTemplate" />

<property name="jndiName" value="ConnectionFactory" />

</bean>

<bean id="jmsQueue"

class="org.springframework.jndi.JndiObjectFactoryBean">

<property name="jndiTemplate" ref="jndiTemplate"></property>

<property name="jndiName" value="Queue"></property>

</bean>

<!-- jms template -->

<bean id="jmsTemplate"

class="org.springframework.jms.core.JmsTemplate">

<property name="connectionFactory" ref="jmsConnectionFactory"></property>

<property name="defaultDestination" ref="jmsQueue"></property>

</bean>

6、Spring 在配置中使用*.properties

Java代码


<?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"

xmlns:util="http://www.springframework.org/schema/util"

xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.0.xsd">
<context:annotation-config/>

<!-- picks up and registers AppConfig as a bean definition -->

<context:component-scan base-package="com.web.spring.other" />

<bean class="com.web.spring.other.AppConfig"/>

访法一

<context:property-placeholder location="classpath:jdbc.properties" />

方法二

<util:properties id="jdbcProperties" location="classpath:jdbc.properties"/>

</beans>

Java代码


实现一：

package com.web.spring.other;

import org.springframework.beans.factory.annotation.Value;

import org.springframework.context.annotation.Bean;

import org.springframework.context.annotation.Configuration;

import org.springframework.context.annotation.ImportResource;

@Configuration

@ImportResource("classpath*:spring/spring-properties.xml")

public class AppConfig {

private @Value("${jdbc.driverClassName}") String driverClassName;

@Bean(initMethod = "init")

public JDBCBean jdbc(){

JDBCBean jdbc=new JDBCBean();

jdbc.setDriverClassName(driverClassName);

return jdbc;

}

}

实现二：

package com.web.spring.other;

import org.springframework.beans.factory.annotation.Value;

import org.springframework.context.annotation.Bean;

import org.springframework.context.annotation.Configuration;

@Configuration

public class AppConfig {

private @Value("#{jdbcProperties.driverClassName}") String driverClassName;

//private @Value("#{jdbcProperties['jdbc.driverClassName']}") String driverClassName;

@Bean(initMethod = "init")

public JDBCBean jdbc(){

JDBCBean jdbc=new JDBCBean();

jdbc.setDriverClassName(driverClassName);

return jdbc;

}

}