java操作属性文件工具类

package com.viathink.utils;import java.io.FileNotFoundException;import java.io.FileWriter;import java.io.IOException;import java.io.InputStream;import java.util.HashMap;import java.util.LinkedList;import java.util.List;import java.util.Map;import java.util.Properties;/** * @Description 加载属性配置文件工具类 * @Package com.viathink.utils.PropertiesFilesUtils.java * @author LiuJunGuang * @date 2012-5-16 下午3:18:19 * @version V1.0 */public class PropertiesFilesUtils {private static final PropertiesFilesUtils propertiesFiles = new PropertiesFilesUtils();/** * 存放所有的属性配置文件对象 */private Map<String, Properties> propertiesMap = new HashMap<String, Properties>();private PropertiesFilesUtils() {}/** * 获得属性配置文件工具类的实例对象 *  * @return PropertiesFilesUtils 对象 */public static PropertiesFilesUtils getInstance() {return propertiesFiles;}/** * 获取Properties文件对象 *  * @param PropertiesFileName * @return * @throws IOException */public synchronized Properties getProperties(String propertiesFileName) throws IOException {if (propertiesFileName == null || "".equals(propertiesFileName)) {throw new IllegalArgumentException("The propertiesFileName is illegal argument!");}Properties prop = propertiesMap.get(propertiesFileName);if (prop == null) {prop = new Properties();InputStream is = this.getClass().getResourceAsStream(propertiesFileName);if (is == null)throw new FileNotFoundException("The file \"" + propertiesFileName + "\" is  not found!");prop.load(is);propertiesMap.put(propertiesFileName, prop);}return prop;}/** * 将properties文件写到磁盘上 *  * @param properties *            属性文件 * @param propertiesFilePath *            要保存的路径 * @throws IOException */public void writePropertiesFile(Properties properties, String propertiesFilePath) throws IOException {if (properties == null || propertiesFilePath == null || "".equals(propertiesFilePath))throw new IllegalArgumentException("The props or propertiesFilePath  is illegal argument!");FileWriter fw = new FileWriter(propertiesFilePath);properties.store(fw, null);fw.flush();fw.close();}/** * 更新属性文件的某个属性,并保存到磁盘上 *  * @param properties *            要更新的属性文件 * @param propertyName *            属性名称 * @param propertyValue *            属性值 * @param filePath *            保存的文件路径 * @throws IOException */public void updatePropertiesFile(Properties properties, String propertyName, String propertyValue, String filePath)throws IOException {if (properties == null || propertyName == null || "".equals(propertyName) || propertyValue == null|| "".equals(propertyValue) || filePath == null || "".equals(filePath))throw new IllegalArgumentException("The parameters  is illegal argument!");properties.setProperty(propertyName, propertyValue);writePropertiesFile(properties, filePath);}/** * 根据属性配置文件名称和属性名称获取属性配置值 *  * @param propertiesFileName *            属性配置文件名称 * @param propertyName *            属性名称 * @return 属性值 * @throws IOException */public String getProperty(String propertiesFileName, String propertyName) throws IOException {Properties prop = getProperties(propertiesFileName);return prop.getProperty(propertyName);}/** * 获得Properties对象列表 *  * @return */public List<Properties> getProperties() {if (propertiesMap.isEmpty())return null;return new LinkedList<Properties>(propertiesMap.values());}/** * 获得属性对象Map *  * @return */public Map<String, Properties> getPropertiesMap() {return propertiesMap;}public static void main(String[] args) throws IOException {PropertiesFilesUtils pfu = PropertiesFilesUtils.getInstance();Properties pro = pfu.getProperties("/msswms_message.properties");pro.list(System.out);Properties pro1 = pfu.getProperties("/msswms_message.properties");Properties pro2 = pfu.getProperties("/msswms_message.properties");Properties pro3 = pfu.getProperties("/msswms_message.properties");System.out.println(pro == pro1);System.out.println(pro == pro2);System.out.println(pro == pro3);System.out.println(pfu.getProperties().size());System.out.println(pfu.getPropertiesMap().size());System.out.println(pro.getProperty("messge.type"));pfu.updatePropertiesFile(pro, "messge.type", "image", "d:/a.text");System.out.println(pro.getProperty("messge.type"));}}