byte&String
byte2HexString
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| public void byte2HexString(byte[] bytes){
if (bytes == null) return null;
StringBuilder ret = new StringBuilder(2*bytes.length);
for (int i = 0 ; i < bytes.length ; i++) {
int b;
b = 0x0f & (bytes[i] >> 4);
ret.append("0123456789abcdef".charAt(b));
b = 0x0f & bytes[i];
ret.append("0123456789abcdef".charAt(b));
}
return ret.toString();
}
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hexString2Byte
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| public void hexString2Byte(String str){
if (str==null||str.length()&0x1==1) return null;
str=str.toLowerCase();
byte[] ret=new byte[str.length()/2];
for(int i=0;i<str.length;i++){
byte high = (byte) "0123456789abcdef".indexOf(str.charAt(i));
byte low = (byte) "0123456789abcdef".indexOf(str.charAt(++i));
ret[i/2] = (byte) ((byte)(high<<4) | low );
}
return ret;
}
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base64&Img
just base64 encode/decode
Base64toImg
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| public static void parseImg(String path, String imgStr) {
Base64.Decoder decoder = Base64.getDecoder();
byte[] retbytes = decoder.decode(imgStr);
try {
Files.write(Paths.get(path), retbytes);
} catch (IOException e) {
e.printStackTrace();
}
}
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