Java J2EE读取配置文件

package com;
 
import org.slf4j.Logger;
 
import org.slf4j.LoggerFactory;
 
import javax.naming.InitialContext;
 
import java.io.File;
 
import java.io.FileFilter;
 
import java.io.FileReader;
 
import java.util.Iterator;
 
import java.util.Map;
 
import java.util.Map.Entry;
 
import java.util.Properties;
 
import java.util.concurrent.ConcurrentHashMap;
 
/**
 
 * 读取配置文件
 
 */
 
public class ReadProperty {
 
	private static final Logger logger = LoggerFactory.getLogger(Globals.class);
 
	private static String confHome = null;
 
	//并发，线程安全的map
 
	private static Map<String, String> confProperties = new ConcurrentHashMap<>();
 
	private static Map<String, File> confFiles = new ConcurrentHashMap<>();
 
	//加载成功
 
	private static boolean loadingSuccess = true;
 
    /**
 
     * 加载配置文件
 
	 */
 
	private synchronized static void loadProperties() {
 
		//如果没有加载成功，返回
 
		if ( !loadingSuccess ) {
 
            return;
 
		}
 
		//如果加载的文件是空的
 
		if (confProperties.isEmpty()) {
 
			//如果电脑环境变量中为空
 
			if (confHome == null) {
 
	        	confHome = System.getProperty("CONF_HOME");
 
	        }
 
	        //如果web.xml中没配
 
	        if (confHome == null) {
 
	            try {
 
	                InitialContext context = new InitialContext();
 
	                confHome = (String)context.lookup("java:comp/env/CONF_HOME");
 
	            } catch(Exception e) {
 
	            	logger.warn("Can not find jini name {}", "java:comp/env/CONF_HOME");
 
	            }
 
	        }
 
	        //如果还是为空，就找本机路径下的ProtectionDomain/CodeSource/Location/getFile/WEB-INF/文件夹/conf
 
	        if (confHome == null) {
 
	        	confHome = (new InitWebPath()).getRootPath() + "WEB-INF" + File.separator + "conf";
 
	        }
 
	        //是否是文件夹
 
		   try {
 
			   File dirFile = new File(confHome);
 
			   if(!dirFile.exists() || (!dirFile.isDirectory())){ 
 
				   logger.warn("Can not find home or is not directory!\n{}", confHome);
 
				   loadingSuccess = false;
 
				   return;
 
			   }
 
			   //获取所有文件后缀是.properties的文件名
 
			   File[] files = dirFile.listFiles(new FileFilter() {
 
				   @Override
 
				   public boolean accept(File file) {
 
					   String fileName = file.getName();
 
					   int pos = fileName.lastIndexOf(".properties");//最后一个匹配的 db.xml和db.xml.xml
 
					   if (pos != -1) {  
 
						   confFiles.put(fileName.substring(0, pos), file);//文件名与文件关联 key value 
 
						   return true;
 
					   } else {
 
						   pos = fileName.lastIndexOf(".xml");
 
						   confFiles.put(fileName.substring(0, pos), file);
 
						   return false;
 
					   }
 
				   }
 
			   }
 
			   );
 
			   //迭代文件，读取key value
 
			   for(File file : files) {
 
				   Properties fileProperties = new Properties();
 
				   fileProperties.load(new FileReader(file));
 
				   Iterator<Entry<Object, Object>> iterProp = fileProperties.entrySet().iterator();
 
				   while(iterProp.hasNext()) {
 
					   Entry<Object, Object> row = iterProp.next();
 
					   Object key = row.getKey();
 
					   Object value = row.getValue();
 
					   if (null!=key && null!=value) {
 
						   confProperties.put(key.toString(), value.toString());
 
					   }
 
				   }
 
			   }
 
		   } catch(Exception e) {
 
			   loadingSuccess = false;
 
		   }
 
		}
 
	}
 
	/**
 
	 * 读取配置文件信息
 
	 * @param name key
 
	 * @return value
 
	 */
 
	public static String getProperty(String name) {
 
		if (confProperties.isEmpty()) {
 
			loadProperties();
 
		}
 
		return confProperties.get(name);
 
	}
 
	static class InitWebPath{
 
		public String getRootPath() {
 
			String url = InitWebPath.class.getProtectionDomain().getCodeSource().getLocation().getFile();
 
			String filePath = "";
 
			try {
 
				filePath = java.net.URLDecoder.decode(url, "utf-8");
 
			} catch (Exception e) {
 
				logger.error(e.getMessage(), e);
 
			}
 
			final String fileFlag = "file:";
 
			if (filePath.startsWith(fileFlag)) {
 
				filePath = filePath.substring(fileFlag.length());
 
			}
 
			final String applicationFlag = "WEB-INF";
 
			return filePath.substring(0, filePath.lastIndexOf(applicationFlag));
 
		}
 
	}
 
}