在理解二進制和十進制、十六進制時發現的，作為后續參考保存！

public class codeCon {/*** 字符串轉換成十六進制值* @param bin String 我們看到的要轉換成十六進制的字符串* @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();}/*** 十六進制轉換字符串* @param hex String 十六進制* @return String 轉換后的字符串*/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字節碼轉字符串 * @param b * @return */public static String byte2hex(byte[] b) { //一個字節的數，// 轉成16進制字符串String hs = "";String tmp = "";for (int n = 0; n < b.length; n++) {//整數轉成十六進制表示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(); //轉成大寫}/*** 字符串轉java字節碼* @param b* @return*/public static byte[] hex2byte(byte[] b) {if ((b.length % 2) != 0) {throw new IllegalArgumentException("長度不是偶數");}byte[] b2 = new byte[b.length / 2];for (int n = 0; n < b.length; n += 2) {String item = new String(b, n, 2);// 兩位一組，表示一個字節,把這樣表示的16進制字符串，還原成一個進制字節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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