JAVA中的Configuration类详解

<dependency> 
  <groupId>commons-configuration</groupId> 
  <artifactId>commons-configuration</artifactId> 
  <version>1.9</version> 
</dependency> 
<!-- commons-configuration 自动加载的是2.1的版本，编译时会报错，所以再加上这个 --> 
<dependency> 
  <groupId>commons-lang</groupId> 
  <artifactId>commons-lang</artifactId> 
  <version>2.6</version> 
</dependency> 

PropertiesConfiguration config = new PropertiesConfiguration(“/database.properties”); 
String userName = config.getString("name"); 

package com.xxx.xxx.util;
import java.util.HashMap;
import java.util.Map;
import org.apache.commons.configuration.ConfigurationException;
import org.apache.commons.configuration.PropertiesConfiguration;
/** 
 * <p> 
 * 读取配置文件类 
 * </p> 
 * <p> 
 * 根据配置文件名和属性key返回属性内容，configUtil.get(configFile, property); 
 * </p> 
 * @author shengzhi.rensz 
 * 
 */
public class configUtil {
	private static configUtil initor = new configUtil();
	private static Map<String, Object> configMap = new HashMap<String, Object>();
	private configUtil() {
	}
	/** 
   * 获取内容 
   * @param configFile 
   * @param property 
   * @return 
   */
	public static String get(String configFile, String property) {
		if(!configMap.containsKey(configFile)) {
			initor.initConfig(configFile);
		}
		PropertiesConfiguration config = (PropertiesConfiguration) configMap.get(configFile);
		String value = config.getString(property);
		//TODO LOG 
		return value;
	}
	/** 
   * 载入配置文件，初始化后加入map 
   * @param configFile 
   */
	private synchronized void initConfig(String configFile) {
		try {
			PropertiesConfiguration config = new PropertiesConfiguration(configFile);
			configMap.put(configFile, config);
		}
		catch (ConfigurationException e) {
			e.printStackTrace();
		}
	}
}

configUtil.get("/common/velocity.properties", "input.encoding"); 

public static void readProperties() throws ConfigurationException { 
    PropertiesConfiguration pcfg = new PropertiesConfiguration("config/cfg.properties"); 
    System.out.println(pcfg.getString("platform.jre")); 
  }