android String byte[] 进制之间的互相转换
/** * 字符串转换成十六进制字符串 * @param String str 待转换的ASCII字符串 * @return String 每个Byte之间空格分隔,如: [61 6C 6B] */ 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]); sb.append(' '); } return sb.toString().trim(); } /** * 十六进制转换字符串 * @param String str Byte字符串(Byte之间无分隔符 如:[616C6B]) * @return String 对应的字符串 */ 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 * @param byte[] b byte数组 * @return String 每个Byte值之间空格分隔 */ public static String byte2HexStr(byte[] b) { String stmp=""; StringBuilder sb = new StringBuilder(""); for (int n=0;n<b.length;n++) { stmp = Integer.toHexString(b[n] & 0xFF); sb.append((stmp.length()==1)? "0"+stmp : stmp); sb.append(" "); } return sb.toString().toUpperCase().trim(); } /** * bytes字符串转换为Byte值 * @param String src Byte字符串,每个Byte之间没有分隔符 * @return byte[] */ 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] = Byte.decode("0x" + src.substring(i*2, m) + src.substring(m,n)); } return ret; } /** * String的字符串转换成unicode的String * @param String strText 全角字符串 * @return String 每个unicode之间无分隔符 * @throws Exception */ public static String strToUnicode(String strText) throws Exception { char c; StringBuilder str = new StringBuilder(); 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) str.append("\\u" + strHex); else // 低位在前面补00 str.append("\\u00" + strHex); } return str.toString(); } /** * unicode的String转换成String的字符串 * @param String hex 16进制值字符串 (一个unicode为2byte) * @return String 全角字符串 */ public static String unicodeToString(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(); }
//------------------------------------------------------- // 判断奇数或偶数,位运算,最后一位是1则为奇数,为0是偶数 static public int isOdd(int num) { return num & 0x1; } //------------------------------------------------------- static public int HexToInt(String inHex)//Hex字符串转int { return Integer.parseInt(inHex, 16); } //------------------------------------------------------- static public byte HexToByte(String inHex)//Hex字符串转byte { return (byte)Integer.parseInt(inHex,16); } //------------------------------------------------------- static public String Byte2Hex(Byte inByte)//1字节转2个Hex字符 { return String.format("%02x", inByte).toUpperCase(); } //------------------------------------------------------- static public String ByteArrToHex(byte[] inBytArr)//字节数组转转hex字符串 { StringBuilder strBuilder=new StringBuilder(); int j=inBytArr.length; for (int i = 0; i < j; i++) { strBuilder.append(Byte2Hex(inBytArr[i])); strBuilder.append(" "); } return strBuilder.toString(); } //------------------------------------------------------- static public String ByteArrToHex(byte[] inBytArr,int offset,int byteCount)//字节数组转转hex字符串,可选长度 { StringBuilder strBuilder=new StringBuilder(); int j=byteCount; for (int i = offset; i < j; i++) { strBuilder.append(Byte2Hex(inBytArr[i])); } return strBuilder.toString(); } //------------------------------------------------------- //转hex字符串转字节数组 static public byte[] HexToByteArr(String inHex)//hex字符串转字节数组 { int hexlen = inHex.length(); byte[] result; if (isOdd(hexlen)==1) {//奇数 hexlen++; result = new byte[(hexlen/2)]; inHex="0"+inHex; }else {//偶数 result = new byte[(hexlen/2)]; } int j=0; for (int i = 0; i < hexlen; i+=2) { result[j]=HexToByte(inHex.substring(i,i+2)); j++; } return result; }
转载于:https://my.oschina.net/u/2542649/blog/1550640