Java字节码进制转换

来源：互联网发布：淘宝浩升软件什么用途编辑：程序博客网时间：2024/05/22 13:19
在理解二进制和十进制、十六进制时发现的，作为后续参考保存！
public class codeCon {/**     * 字符串转换成十六进制值     * @param bin String 我们看到的要转换成十六进制的字符串     * @return      */    public static String bin2hex(String bin) {        char[] digital = "0123456789ABCDEF".toCharArray();        StringBuffer sb = new StringBuffer("");        byte[] bs = bin.getBytes();        int bit;        for (int i = 0; i < bs.length; i++) {            bit = (bs[i] & 0x0f0) >> 4;            sb.append(digital[bit]);            bit = bs[i] & 0x0f;            sb.append(digital[bit]);        }        return sb.toString();    }     /**     * 十六进制转换字符串     * @param hex String 十六进制     * @return String 转换后的字符串     */    public static String hex2bin(String hex) {        String digital = "0123456789ABCDEF";        char[] hex2char = hex.toCharArray();        byte[] bytes = new byte[hex.length() / 2];        int temp;        for (int i = 0; i < bytes.length; i++) {            temp = digital.indexOf(hex2char[2 * i]) * 16;            temp += digital.indexOf(hex2char[2 * i + 1]);            bytes[i] = (byte) (temp & 0xff);        }        return new String(bytes);    }     /**      * java字节码转字符串      * @param b      * @return      */    public static String byte2hex(byte[] b) { //一个字节的数，        // 转成16进制字符串        String hs = "";        String tmp = "";        for (int n = 0; n < b.length; n++) {            //整数转成十六进制表示            tmp = (java.lang.Integer.toHexString(b[n] & 0XFF));            if (tmp.length() == 1) {                hs = hs + "0" + tmp;            } else {                hs = hs + tmp;            }        }        tmp = null;        return hs.toUpperCase(); //转成大写     }     /**     * 字符串转java字节码     * @param b     * @return     */    public static byte[] hex2byte(byte[] b) {        if ((b.length % 2) != 0) {            throw new IllegalArgumentException("长度不是偶数");        }        byte[] b2 = new byte[b.length / 2];        for (int n = 0; n < b.length; n += 2) {            String item = new String(b, n, 2);            // 两位一组，表示一个字节,把这样表示的16进制字符串，还原成一个进制字节            b2[n / 2] = (byte) Integer.parseInt(item, 16);        }        b = null;        return b2;    }public static void main(String[] args)  { String content = "你好！fjssharpsword";        System.out.println(hex2bin(bin2hex(content)));        byte[] b={'a','b'};        System.out.println(byte2hex(hex2byte(b)));} }
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