Properties file read operation

package com.cmccsi.framework.util;

import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.util.Iterator;
import java.util.Properties;
import java.util.Map.Entry;
/**
 * Tool class for properties file operations
 * Get, add, modify
 * Note: The following method of reading the properties file will cause caching problems, and it will not work when modifying the properties file.
 *　InputStream in = PropertiesUtils.class.getResourceAsStream("/config.properties");
 * Solution:
 *　String savePath = PropertiesUtils.class.getResource("/config.properties").getPath();
 */
public class PropertiesUtils {
	/**
	 * Get the data of the property file to get the value according to the key
	 * @param fileName file name (note: the file under src is loaded, if it is under a package. Please add the package name)
	 * @param key
	 * @return
	 */
	public static String findPropertiesKey(String key) {
		
		try {
			Properties prop = getProperties();
			return prop.getProperty(key);
		} catch (Exception e) {
			return "";
		}
		
	}

	public static void main(String[] args) {
		Properties prop = new Properties();
		InputStream in = PropertiesUtils.class
				.getResourceAsStream("/config.properties");
		try {
			prop.load(in);
			Iterator<Entry<Object, Object>> itr = prop.entrySet().iterator();
			while (itr.hasNext()) {
				Entry<Object, Object> e = (Entry<Object, Object>) itr.next();
				System.err.println((e.getKey().toString() + "" + e.getValue()
						.toString()));
			}
		} catch (Exception e) {
			
		}
	}

	/**
	 * return Properties
	 * @param fileName file name (note: the file under src is loaded, if it is under a package. Please add the package name)
	 * @param
	 * @return
	 * @throws UnsupportedEncodingException
	 */
	public static Properties getProperties() throws UnsupportedEncodingException{
		Properties prop = new Properties();
		String savePath = PropertiesUtils.class.getResource("/config.properties").getPath();
		savePath= java.net.URLDecoder.decode(savePath,"utf-8");
		//The following method reads the properties file will cache the problem
//		InputStream in = PropertiesUtils.class
//				.getResourceAsStream("/config.properties");
		try {
			InputStream in =new BufferedInputStream(new FileInputStream(savePath));
			//InputStream in = PropertiesUtils.class.getResourceAsStream("/config.properties");
			prop.load(in);
		} catch (Exception e) {
			return null;
		}
		return prop;
	}

	public static Properties getjdbcProperties() throws UnsupportedEncodingException{
		Properties prop = new Properties();		
		
		String savePath = PropertiesUtils.class.getResource("/jdbc.properties").getPath();
		savePath= java.net.URLDecoder.decode(savePath,"utf-8");
		
		//The following method reads the properties file will cache the problem
//		InputStream in = PropertiesUtils.class
//				.getResourceAsStream("/config.properties");
		try {
			InputStream in =new BufferedInputStream(new FileInputStream(savePath));  
			//InputStream in =PropertiesUtils.class.getResourceAsStream("/jdbc.properties");
			prop.load(in);
			in.close();
		} catch (Exception e) {
			return null;
		}
		return prop;
	}
	/**
	 * Write properties information
	 *
	 * @param key
	 * name
	 * @param value
	 * value
	 */
	public static void modifyProperties(String key, String value) {
		try {
			// Read a list of attributes (key and element pairs) from the input stream
			Properties prop = getProperties();
			prop.setProperty(key, value);
			String path = PropertiesUtils.class.getResource("/config.properties").getPath();
			FileOutputStream outputFile = new FileOutputStream(path);
			prop.store(outputFile, "modify");
			outputFile.close();
			outputFile.flush();
		} catch (Exception e) {
		}
	}
}