编码方式获取Spring中PropertyPlaceholderConfigurer的属性

参考原文：http://antlove.iteye.com/blog/1820078
本文只是修改了一下适用于spring web项目
可以在程序中通过属性名获取到在属性文件定义的属性值。

package com.tqmall.elasticsearch.util;import org.springframework.beans.BeansException;import org.springframework.beans.factory.config.BeanFactoryPostProcessor;import org.springframework.beans.factory.config.PropertyResourceConfigurer;import org.springframework.context.ApplicationContext;import org.springframework.context.ApplicationContextAware;import org.springframework.context.support.AbstractApplicationContext;import org.springframework.core.io.support.PropertiesLoaderSupport;import org.springframework.stereotype.Component;import java.lang.reflect.Method;import java.util.Properties;/** * Created by 刘一波 on 15/8/5. * E-Mail:[e-mail] */@Componentpublic class SpringPropertyResourceReader implements ApplicationContextAware {    private static ApplicationContext applicationContext;    private static AbstractApplicationContext abstractContext;    private static Properties properties = new Properties();    private static void init() {        try {            // get the names of BeanFactoryPostProcessor            String[] postProcessorNames = abstractContext.getBeanNamesForType(BeanFactoryPostProcessor.class, true, true);            for (String ppName : postProcessorNames) {                // get the specified BeanFactoryPostProcessor                BeanFactoryPostProcessor beanProcessor =                        abstractContext.getBean(ppName, BeanFactoryPostProcessor.class);                // check whether the beanFactoryPostProcessor is                // instance of the PropertyResourceConfigurer                // if it is yes then do the process otherwise continue                if (beanProcessor instanceof PropertyResourceConfigurer) {                    PropertyResourceConfigurer propertyResourceConfigurer =                            (PropertyResourceConfigurer) beanProcessor;                    // get the method mergeProperties                    // in class PropertiesLoaderSupport                    Method mergeProperties = PropertiesLoaderSupport.class.                            getDeclaredMethod("mergeProperties");                    // get the props                    mergeProperties.setAccessible(true);                    Properties props = (Properties) mergeProperties.                            invoke(propertyResourceConfigurer);                    // get the method convertProperties                    // in class PropertyResourceConfigurer                    Method convertProperties = PropertyResourceConfigurer.class.                            getDeclaredMethod("convertProperties", Properties.class);                    // convert properties                    convertProperties.setAccessible(true);                    convertProperties.invoke(propertyResourceConfigurer, props);                    properties.putAll(props);                }            }        } catch (Exception e) {            throw new RuntimeException(e);        }    }    public static String getProperty(String propertyName) {        return properties.getProperty(propertyName);    }    @Override    public void setApplicationContext(ApplicationContext arg0) throws BeansException {        applicationContext = arg0;        abstractContext = (AbstractApplicationContext) applicationContext;        init();    }}