读写properties文件方法

按key读取properties文件中的value

    public static String readSystemConfig(String key){        
        Properties prop = new Properties();
        String value = null;
        try {
            InputStream inputStream = new FileInputStream(FilePath);
            prop.load(inputStream);
            value = prop.getProperty(key);
            inputStream.close();
        } catch (Exception e) {
            logger.error("读取配置文件出错",e);
        }
        return value.trim();        
    }

按key写入properties文件内容

public static void writePropertiesInfo(String key,String value) {
        Properties prop = new Properties();
        try {
            FileInputStream in = new FileInputStream(FilePath);
            prop.load(in);
            in.close();
            prop.setProperty(key, value);
            FileOutputStream out = new FileOutputStream(FilePath);
            prop.store(out, "Conmments");
            out.flush();
            out.close();
        } catch (Exception e) {
            logger.error("配置文件写入取错误" + e);
        }
    }