JAVA byte数组转化为16进制字符串输出
最简单的方法:
利用javax.xml.bind包下的DatatypeConverter
printHexBinary
public static java.lang.String printHexBinary(byte[] val)
-
Converts an array of bytes into a string.
-
- Parameters:
val
- An array of bytes- Returns:
- A string containing a lexical representation of xsd:hexBinary
- Throws:
IllegalArgumentException
- if val is null.
import javax.xml.bind.DatatypeConverter; import java.io.UnsupportedEncodingException; public class test { public static void main(String[] args) throws UnsupportedEncodingException{ //print hex string version of HELLO WORLD byte[] helloBytes = "HELLO WORLD".getBytes(); String helloHex = DatatypeConverter.printHexBinary(helloBytes); System.out.printf("Hello hex: 0x%s\n", helloHex); //convert hex-encoded string back to original string byte[] decodedHex = DatatypeConverter.parseHexBinary(helloHex); String decodedString = new String(decodedHex, "UTF-8"); System.out.printf("Hello decoded : %s\n", decodedString); } }
或者使用stackoverflow提供的方法,貌似最快
final protected static char[] hexArray = "0123456789ABCDEF".toCharArray(); public static String bytesToHex(byte[] bytes) { char[] hexChars = new char[bytes.length * 2]; for ( int j = 0; j < bytes.length; j++ ) { int v = bytes[j] & 0xFF; hexChars[j * 2] = hexArray[v >>> 4]; hexChars[j * 2 + 1] = hexArray[v & 0x0F]; } return new String(hexChars); }
又或者使用java源码:
D:\JAVA\jdk1.8.0_65\src\javax\xml\bind\DatatypeConverterImpl.java
private static final char[] hexCode = "0123456789ABCDEF".toCharArray(); public String printHexBinary(byte[] data) { StringBuilder r = new StringBuilder(data.length * 2); for (byte b : data) { r.append(hexCode[(b >> 4) & 0xF]); r.append(hexCode[(b & 0xF)]); } return r.toString(); }
Keep it simple!