private final static String SYS_TEMP_FILE = System                .getProperty("java.io.tmpdir") + "\\9884698793643198z.properties";        private static Map<String, String> fileNames = null;          /**        * get a file path from a system temp file.        *         * @param keyOfFileName        * @return        */        public static final String getAFilePathFromSysTempFile(String keyOfFileName) {            if (null == fileNames) {                fileNames = new HashMap<String, String>();                loadFilePathsFromSysTempFile();            }            String path = fileNames.get(keyOfFileName);            return null == path ? "" : path;        }          private static final boolean loadFilePathsFromSysTempFile() {            try {                if (!new File(SYS_TEMP_FILE).exists()) {                    new File(SYS_TEMP_FILE).createNewFile();                    return true;                }                Properties props = new Properties();                InputStream in = new BufferedInputStream(new FileInputStream(                        SYS_TEMP_FILE));                props.load(in);                Enumeration<?> en = props.propertyNames();                while (en.hasMoreElements()) {                    String key = (String) en.nextElement();                    String prop = props.getProperty(key);                    fileNames.put(key, prop);                  }                return true;            } catch (Exception e) {                e.printStackTrace();                return false;            }        }          /**        * save a file path to a system temp file.        *         * @param parameterName        * @param parameterValue        * @return        */        public static final int saveAFilePathToSysTempFile(String parameterName,                String parameterValue) {            Properties prop = new Properties();            try {                InputStream fis = new FileInputStream(SYS_TEMP_FILE);                prop.load(fis);                  OutputStream fos = new FileOutputStream(SYS_TEMP_FILE);                prop.setProperty(parameterName, parameterValue);                prop.store(fos, "Update '" + parameterName + "' value");                  fileNames.put(parameterName, parameterValue);                return fileNames.size();            } catch (IOException e) {                e.printStackTrace();                return -1;            }        }