如何将hex转换为base64
如何将hex字符串转换为base64？ 我找到了这个页面http://home2.paulschou.net/tools/xlate/但是我需要java中的一些函数： String base64 = ...decoder(String hex); 我在互联网上找到了一些东西，但它们很难并使用字节数组。 我正在寻找一些简单的东西
看看Commons Codec ：
byte[] decodedHex = Hex.decodeHex(hex); byte[] encodedHexB64 = Base64.codeBase64(decodedHex);
您不太可能找到直接从hex转换为base-64的内容。 您需要找到或写入hex解码器和base-64编码器，并使用byte[]作为中间forms。
将现实与您的要求进行比较：
String b64 = encoder.encode(decoder.decode(hex)); /* Too difficult :( !!! */
与
String b64 = transcoder.transcode(hex); /* So much simpler! */
您可能想要查看此代码。 我在谷歌上发现了它
import java.io.UnsupportedEncodingException; import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; import sun.misc.BASE64Encoder; public class MD5 { static char[] carr = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' }; public static String getBase64FromHEX(String input) { byte barr[] = new byte[16]; int bcnt = 0; for (int i = 0; i < 32; i += 2) { char c1 = input.charAt(i); char c2 = input.charAt(i + 1); int i1 = intFromChar(c1); int i2 = intFromChar(c2); barr[bcnt] = 0; barr[bcnt] |= (byte) ((i1 & 0x0F) << 4); barr[bcnt] |= (byte) (i2 & 0x0F); bcnt++; } BASE64Encoder encoder = new BASE64Encoder(); return encoder.encode(barr); } public static synchronized String getMD5_Base64(String input) { // please note that we dont use digest, because if we // cannot get digest, then the second time we have to call it // again, which will fail again MessageDigest digest = null; try { digest = MessageDigest.getInstance("MD5"); } catch (Exception ex) { ex.printStackTrace(); } if (digest == null) return input; // now everything is ok, go ahead try { digest.update(input.getBytes("UTF-8")); } catch (java.io.UnsupportedEncodingException ex) { ex.printStackTrace(); } byte[] rawData = digest.digest(); BASE64Encoder bencoder = new BASE64Encoder(); return bencoder.encode(rawData); } private static int intFromChar(char c) { char clower = Character.toLowerCase(c); for (int i = 0; i < carr.length; i++) { if (clower == carr[i]) { return i; } } return 0; } public static void main(String[] args) { //String password = args[0]; String password = "test"; MessageDigest digest = null; try { digest = MessageDigest.getInstance("MD5"); } catch (NoSuchAlgorithmException e) { e.printStackTrace(); } try { digest.update(password.getBytes("UTF-8")); } catch (UnsupportedEncodingException ex) { ex.printStackTrace(); } byte[] rawData = digest.digest(); StringBuffer printable = new StringBuffer(); for (int i = 0; i < rawData.length; i++) { printable.append(carr[((rawData[i] & 0xF0) >> 4)]); printable.append(carr[(rawData[i] & 0x0F)]); } String phpbbPassword = printable.toString(); System.out.println("PHPBB : " + phpbbPassword); System.out.println("MVNFORUM : " + getMD5_Base64(password)); System.out.println("PHPBB->MVNFORUM : " + getBase64FromHEX(phpbbPassword)); } }
首先，您必须导入Apache Commons Codec库！ https://commons.apache.org/proper/commons-codec/archives/1.9/index.html
以下是1.9版本的API http://commons.apache.org/proper/commons-codec/archives/1.9/apidocs/index.html
然后你必须遵循这3个步骤
//convert String to char array (1st step) char[] charArray = myhexString.toCharArray(); // decode the char array to byte[] (2nd step) byte[] decodedHex = Hex.decodeHex(charArray); // The String decoded to Base64 (3rd step) String result= Base64.encodeBase64String(decodedHex);
Apache Commons Library
的Javadoc：
http://commons.apache.org/codec/apidocs/org/apache/commons/codec/binary/Base64.html
http://commons.apache.org/codec/apidocs/org/apache/commons/codec/binary/Hex.html
下载： http ： //commons.apache.org/codec/download_codec.cgi