Java 字符串,byte[],16进制的字符串互转

在调试的时候，如果要显示byte的值是否与预期一致，一般转换为16进制的字符串，或者使用base64转换后，然后显示出来。

 

/** * 字符串转换成十六进制字符串 */ public static String str2HexStr(String str) { char[] chars = "0123456789ABCDEF".toCharArray(); StringBuilder sb = new StringBuilder(""); byte[] bs = str.getBytes(); int bit; for (int i = 0; i < bs.length; i++) { bit = (bs[i] & 0x0f0) >> 4; sb.append(chars[bit]); bit = bs[i] & 0x0f; sb.append(chars[bit]); } return sb.toString(); } /** * * 十六进制转换字符串 */ public static String hexStr2Str(String hexStr) { String str = "0123456789ABCDEF"; char[] hexs = hexStr.toCharArray(); byte[] bytes = new byte[hexStr.length() / 2]; int n; for (int i = 0; i < bytes.length; i++) { n = str.indexOf(hexs[2 * i]) * 16; n += str.indexOf(hexs[2 * i + 1]); bytes[i] = (byte) (n & 0xff); } return new String(bytes); } /** * bytes转换成十六进制字符串 */ public static String byte2HexStr(byte[] b) { String hs = ""; String stmp = ""; for (int n = 0; n < b.length; n++) { stmp = (Integer.toHexString(b[n] & 0XFF)); if (stmp.length() == 1) hs = hs + "0" + stmp; else hs = hs + stmp; // if (n<b.length-1) hs=hs+":"; } return hs.toUpperCase(); } private static byte uniteBytes(String src0, String src1) { byte b0 = Byte.decode("0x" + src0).byteValue(); b0 = (byte) (b0 << 4); byte b1 = Byte.decode("0x" + src1).byteValue(); byte ret = (byte) (b0 | b1); return ret; } /** * bytes转换成十六进制字符串 */ public static byte[] hexStr2Bytes(String src) { int m = 0, n = 0; int l = src.length() / 2; System.out.println(l); byte[] ret = new byte[l]; for (int i = 0; i < l; i++) { m = i * 2 + 1; n = m + 1; ret[i] = uniteBytes(src.substring(i * 2, m), src.substring(m, n)); } return ret; } /** *String的字符串转换成unicode的String */ public static String str2Unicode(String strText) throws Exception { char c; String strRet = ""; int intAsc; String strHex; for (int i = 0; i < strText.length(); i++) { c = strText.charAt(i); intAsc = (int) c; strHex = Integer.toHexString(intAsc); if (intAsc > 128) { strRet += "//u" + strHex; } else { // 低位在前面补00 strRet += "//u00" + strHex; } } return strRet; } /** *unicode的String转换成String的字符串 */ public static String unicode2Str(String hex) { int t = hex.length() / 6; StringBuilder str = new StringBuilder(); for (int i = 0; i < t; i++) { String s = hex.substring(i * 6, (i + 1) * 6); // 高位需要补上00再转 String s1 = s.substring(2, 4) + "00"; // 低位直接转 String s2 = s.substring(4); // 将16进制的string转为int int n = Integer.valueOf(s1, 16) + Integer.valueOf(s2, 16); // 将int转换为字符 char[] chars = Character.toChars(n); str.append(new String(chars)); } return str.toString(); }