详解利用Spring加载Properties配置文件

username=root
password=root

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

 <bean id="configProperties" class="org.springframework.beans.factory.config.PropertiesFactoryBean">
   <property name="locations">
     <list>
       <value>classpath:jdbc.properties</value>
     </list>
   </property>
   <property name="fileEncoding" value="UTF-8"/>
 </bean>
 <bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PreferencesPlaceholderConfigurer">
   <property name="properties" ref="configProperties"/>
 </bean>
</beans>

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = "classpath:spring/spring-properties.xml")
public class TestTrans {
 @Value("#{configProperties['username']}")
 private String username;
 @Value("#{configProperties['password']}")
 private String password;
 @Test
 public void testProperties(){
   System.out.println("---");
   System.out.println(username);
   System.out.println(password);
 }
}