进制之间的转换(16进制转换二进制、二进制转换十进制、整型转换十六进制高低字节排序)

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我是靠谱客的博主个性跳跳糖，最近开发中收集的这篇文章主要介绍进制之间的转换(16进制转换二进制、二进制转换十进制、整型转换十六进制高低字节排序)，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

1.整型转换十六进制并进行高低字节排序

	// 整型转换16进制并排序
   public static String decToHex(Integer dec) {
        StringBuilder hex = new StringBuilder();
        while (dec != 0) {
            String h = Integer.toString(dec & 0xff, 16);
            if ((h.length() & 0x01) == 1)
                h = '0' + h;
            hex.append(h);
            dec = dec >> 8;
        }
        return hex.toString();
    }

2、十六进制转换二进制

	// 十六进制转换二进制
    public static String hexStr2BinArr(String hexString) {
        String[] binaryArray = {"0000", "0001", "0010", "0011", "0100", "0101", "0110", "0111", "1000", "1001", "1010", "1011", "1100", "1101", "1110", "1111"};
        String outStr = "";
        String hexStr = "0123456789ABCDEF";
        //hexString的长度对2取整，作为bytes的长度
        int len = hexString.length() / 2;
        byte[] bytes = new byte[len];
        byte high = 0;//字节高四位
        byte low = 0;//字节低四位
        for (int i = 0; i < len; i++) {
            //右移四位得到高位
            high = (byte) ((hexStr.indexOf(hexString.charAt(2 * i))) << 4);
            low = (byte) hexStr.indexOf(hexString.charAt(2 * i + 1));
            bytes[i] = (byte) (high | low);//高地位做或运算
        }
        int pos = 0;
        for (byte b : bytes) {
            //高四位
            pos = (b & 0xF0) >> 4;
            outStr += binaryArray[pos];
            //低四位
            pos = b & 0x0F;
            outStr += binaryArray[pos];
        }
        return outStr;
    }

3、二进制转换十进制

 // 二进制转换十进制
    public static int scale2Decimal(String number, int scale) {
        //checkNumber(number);
        if (2 > scale || scale > 32) {
            throw new IllegalArgumentException("scale is not in range");
        }
        // 不同其他进制转十进制,修改这里即可
        int total = 0;
        String[] ch = number.split("");
        int chLength = ch.length;
        for (int i = 0; i < chLength; i++) {
            total += Integer.parseInt(ch[i]) * Math.pow(scale, chLength - 1 - i);
        }
        return total;
    }

	// 此方法判断输入的是否是数字
    public static void checkNumber(String number) {
        String regexp = "^\d+$";
        if (null == number || !number.matches(regexp)) {
            throw new IllegalArgumentException("input is not a number");
        }
    }

4、字符串转换ASCII码

 /*字符串转化为ASCII码*/
    private static String stringToAscii(String data) {
        StringBuilder result = new StringBuilder();
        if (StringUtils.isNotEmpty(data)) {
            for (int i = 0; i < data.length(); i++) {
                result.append(Integer.toHexString(data.charAt(i) + 0));
            }
        }
        return result.toString();
    }

5、16进制字符串转换成ASCII

 // 16进制字符串转换为ASCII
    public static String convertHexToString(String hex) {
        StringBuilder sb = new StringBuilder();
        StringBuilder temp = new StringBuilder();
        for (int i = 0; i < hex.length() - 1; i += 2) {
            String output = hex.substring(i, (i + 2));
            //十六进制转换为十进制
            int decimal = Integer.parseInt(output, 16);
            //将十进制转换为字符
            sb.append((char) decimal);
            temp.append(decimal);
        }
        return sb.toString();
    }

6、ASCII转换16进制

 // ASCII码转换为16进制
    public static String convertStringToHex(String str) {

        char[] chars = str.toCharArray();

        StringBuffer hex = new StringBuffer();
        for (int i = 0; i < chars.length; i++) {
            hex.append(Integer.toHexString((int) chars[i]));
        }

        return hex.toString();
    }