根据配置文件的 PropertiesFactoryBean和 PropertyPlaceholderConfigurer可以选择不同的加载方式，我是使用System.setProperty(key, value)，代码中可以直接用System.getProperty(key)取value的值

一、PropertyPlaceholderConfigurer

PropertyPlaceholderConfigurer是解决 properties 文件占位符问题，实现 PropertiesLoaderSupport 类

     	
      		
       			
        
         classpath:jdbc.properties
        			
        
         classpath:redis.properties
        		
       	
      	
      	
      
     

package com.phil.common.prop;import java.util.Map.Entry;import java.util.Properties;import org.apache.log4j.Logger;import org.springframework.beans.factory.InitializingBean;import org.springframework.stereotype.Component;/** * 加载Properties文件 * @author phil * @date 2017年8月13日 * */@Componentpublic class InitializingProperties implements InitializingBean {	private static final Logger logger = Logger.getLogger(InitializingProperties.class);	/*	 * (non-Javadoc)	 * 	 * @see	 * org.springframework.beans.factory.InitializingBean#afterPropertiesSet()	 */	@Override	public void afterPropertiesSet() throws Exception {		Properties props = new Properties();		props.load(InitializingProperties.class.getClassLoader().getResourceAsStream("test1.properties"));				props.load(InitializingProperties.class.getClassLoader().getResourceAsStream("test2.properties"));				for (Entry
     
       e : props.entrySet()) {			System.setProperty(e.getKey().toString(), e.getValue().toString());			logger.info(e.getKey().toString() + "---" + e.getValue().toString());		}	}}
     

二、PropertiesFactoryBean

PropertiesFactoryBean 是PropertiesLoaderSupport 直接的实现类

     	
      		
       
        classpath:portal_dev.properties
       	
      
     

 

package com.phil.common.prop;import java.util.Map.Entry;import java.util.Properties;import org.apache.log4j.Logger;import org.springframework.beans.factory.InitializingBean;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Component;/** * 加载Properties文件 * @author phil * @date 2017年8月13日 * */@Componentpublic class InitializingProperties implements InitializingBean {	private static final Logger logger = Logger.getLogger(InitializingProperties.class);		@Autowired	private Properties propertyConfigurer;	/*	 * (non-Javadoc)	 * 	 * @see	 * org.springframework.beans.factory.InitializingBean#afterPropertiesSet()	 */	@Override	public void afterPropertiesSet() throws Exception {		for (Entry
     
       e : propertyConfigurer.entrySet()) {			System.setProperty(e.getKey().toString(), e.getValue().toString());			logger.info(e.getKey().toString() + "---" + e.getValue().toString());		}	}}