Propertes文件的读取和保存

读取比较简单~~

保存的时候，如果使用默认的property.store()方法，会把所有的注释都忽略~

所以自己采用读取文件的方式，来实现保存property~

 

 

/** * Update the key's value to new value ,and write back to the Configuration * file * * @param configFilePath * Configuration file * @param key * the key * @param value * the new value */public static Boolean updateProperty(String configFilePath, String key, String value) {// Read FileBufferedReader reader = null;try {reader = new BufferedReader(new FileReader(configFilePath));} catch (FileNotFoundException e) {Log.getInstance().fine("Can not find file: " + configFilePath + "."); //$NON-NLS-1$ //$NON-NLS-2$ }StringBuilder builder = new StringBuilder();String tempLine;String tempValue;// Find the property and updatetry {while ((tempLine = reader.readLine()) != null) {if (tempLine.trim().startsWith(COMMENT_FALG)) {builder.append(tempLine).append(LINE_SEPARATOR);continue;}if (tempLine.contains(key)) {tempValue = tempLine.trim().substring(key.length());if (tempValue.trim().startsWith(EQUAL_FLAG)) {tempLine = key + EQUAL_FLAG + value; }}builder.append(tempLine).append(LINE_SEPARATOR);}reader.close();} catch (IOException e) {Log.getInstance().fine("Read configuration file: " + configFilePath + " error."); //$NON-NLS-1$ //$NON-NLS-2$ e.printStackTrace();}// Update FileBufferedWriter writer = null;try {writer = new BufferedWriter(new FileWriter(configFilePath));writer.append(builder.toString());writer.close();} catch (IOException e) {Log.getInstance().fine("Update configuration file: " + configFilePath + " error."); //$NON-NLS-1$ //$NON-NLS-2$ }return true;}/** * Get value from configuration file by key * * @param configFilePath * configuration file path * * @param key * the key * * @return the value */public static String getProperty(String configFilePath, String key) {Properties prop = new Properties();try {prop.load(new FileInputStream(configFilePath));} catch (FileNotFoundException e) {Log.getInstance().fine("Can not find file: " + configFilePath + "."); //$NON-NLS-1$ //$NON-NLS-2$ } catch (IOException e) {Log.getInstance().fine("Error read configuration file: " + configFilePath + " ."); //$NON-NLS-1$ //$NON-NLS-2$ }return prop.getProperty(key);}