java的一些小技巧

java小技巧记录

进制转换

byte转十六进制字符串

String.format("%032x",new BigInteger(1,md5.digest()))

https://docs.oracle.com/javase/8/docs/api/java/util/Formatter.html#syntax

Properties.load中文乱码问题

Properties properties = new Properties();
        try {
            //support chinese
            properties.load(new ByteArrayInputStream(data.getBytes()));

            //auto inject to varManager
            new RelaxedDataBinder(varManager).bind(new MutablePropertyValues(properties));

            logger.info( "new " + varManager.toString() );
        } catch (IOException e) {
            logger.error("set varManager error:",e);
        }

发现properties.load后问题是乱码，解决方案(使用InputStreamReader):

properties.load(new InputStreamReader(
                    new ByteArrayInputStream(data.getBytes(Constant.UTF8)),Constant.UTF8));