JAVA里16进制和字节数组互转
大括号理的就是一个byte类型的数组,里面是3个byte类型那个的数
public static String stringToHexString(String strPart) {
String hexString = "";
for (int i = 0; i < strPart.length(); i++) {
int ch = (int) strPart.charAt(i);
String strHex = Integer.toHexString(ch);
hexString = hexString + strHex;
}
return hexString;
}
private static String hexString="0123456789ABCDEF";
/*
* 将字符串编码成16进制数字,适用于所有字符（包括中文）
*/
public static String encode(String str)
{
// 根据默认编码获取字节数组
byte[] bytes=str.getBytes();
StringBuilder sb=new StringBuilder(bytes.length*2);
// 将字节数组中每个字节拆解成2位16进制整数
for(int i=0;i { sb.append(hexString.charAt((bytes[i]&0xf0)>>4)); sb.append(hexString.charAt((bytes[i]&0x0f)>>0)); } return sb.toString(); } /* * 将16进制数字解码成字符串,适用于所有字符（包括中文） */ public static String decode(String bytes) { ByteArrayOutputStream baos=new ByteArrayOutputStream(bytes.length()/2); // 将每2位16进制整数组装成一个字节 for(int i=0;i baos.write((hexString.indexOf(bytes.charAt(i))<<4 |hexString.indexOf(bytes.charAt(i+1)))); return new String(baos.toByteArray()); } private static byte uniteBytes(byte src0, byte src1) { byte _b0 = Byte.decode("0x" + new String(new byte[] {src0})).byteValue(); _b0 = (byte) (_b0 << 4); byte _b1 = Byte.decode("0x" + new String(new byte[] {src1})).byteValue(); byte ret = (byte) (_b0 | _b1); return ret; public static byte[] HexString2Bytes(String src) { byte[] ret = new byte[6]; byte[] tmp = src.getBytes(); for(int i=0; i<6; ++i ) { ret[i] = uniteBytes(tmp[i*2], tmp[i*2+1]); } return ret; /** * Convert byte[] to hex string.这里我们可以将byte转换成int，然后利用Integer.toHexString(int)来转换成16进制字符串。 * @param src byte[] data * @return hex string */ public static String bytesToHexString(byte[] src){ StringBuilder stringBuilder = new StringBuilder(""); if (src == null || src.length <= 0) { return null; } for (int i = 0; i < src.length; i++) { int v = src[i] & 0xFF; String hv = Integer.toHexString(v); if (hv.length() < 2) { stringBuilder.append(0); } stringBuilder.append(hv); } return stringBuilder.toString(); } /** * Convert hex string to byte[] * @param hexString the hex string * @return byte[] */ public static byte[] hexStringToBytes(String hexString) { if (hexString == null || hexString.equals("")) { return null; } hexString = hexString.toUpperCase(); int length = hexString.length() / 2; char[] hexChars = hexString.toCharArray(); byte[] d = new byte[length]; for (int i = 0; i < length; i++) { int pos = i * 2; d[i] = (byte) (charToByte(hexChars[pos]) << 4 | charToByte(hexChars[pos + 1])); } return d; } /** * Convert char to byte * @param c char * @return byte */ private byte charToByte(char c) { return (byte) "0123456789ABCDEF".indexOf(c); }
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