1. CustomPropertyConfigurer.java

package com.jdd.broker.admin.aspect;import java.util.HashMap;import java.util.Map;import java.util.Properties;import java.util.Map.Entry;import org.springframework.beans.BeansException;import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;import org.springframework.beans.factory.config.PropertyPlaceholderConfigurer;import org.springframework.util.PropertyPlaceholderHelper; public class CustomPropertyConfigurer extends PropertyPlaceholderConfigurer{    private static Map
    
      properties = new HashMap
     
      ();    protected void processProperties(            ConfigurableListableBeanFactory beanFactoryToProcess,            Properties props) throws BeansException {        // cache the properties        PropertyPlaceholderHelper helper = new PropertyPlaceholderHelper(                DEFAULT_PLACEHOLDER_PREFIX, DEFAULT_PLACEHOLDER_SUFFIX, DEFAULT_VALUE_SEPARATOR, false);        for(Entry
      
        entry:props.entrySet()){            String stringKey = String.valueOf(entry.getKey());            String stringValue = String.valueOf(entry.getValue());            stringValue = helper.replacePlaceholders(stringValue, props);            properties.put(stringKey, stringValue);        }        super.processProperties(beanFactoryToProcess, props);    }         public static Map
       
         getProperties() {        return properties;    }         public static String getProperty(String key){        return properties.get(key);    }}
       
      
     
    

 2. applicationContext.xml

       
     
                 
      
                 
       
                      
        
                           
         
          classpath:/jdbc.properties
                       
                               
       
      
     

jdbc.driverClassName=com.mysql.jdbc.Driverjdbc.url=jdbc:mysql://rdsvl6l6emtdjrk6yi4k3public.mysql.rds.aliyuncs.com:3306/test_crowd?useUnicode=true&characterEncoding=utf8&allowMultiQueries=truejdbc.username=test_crowdjdbc.password=test_crowd

package com.jdd.broker.admin.aspect;import java.util.Map;import org.springframework.context.support.ClassPathXmlApplicationContext;public class Main {public static void main(String[] args) {new ClassPathXmlApplicationContext("spring-mvc.xml");Map
     
       properties = CustomPropertyConfigurer.getProperties();System.out.println(properties);}}