Java中的简单MD5加密

这个MD5加密采用16个字符加密，比如用0-9，a-f，16个数字加字母进行加密；这个可以根据需要修改。

package com.sm.util;/* MD5加密类 */import java.security.MessageDigest;public class MD5 {private final static String[] hexDigits = {"0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f"};private static String byteArrayToHexString(byte[] b) { StringBuffer resultSb = new StringBuffer(); for (int i = 0; i < b.length; i++) { resultSb.append(byteToHexString(b[i])); } return resultSb.toString(); } private static String byteToHexString(byte b) { int n = b; if (n < 0) n = 256 + n; int d1 = n / 16; int d2 = n % 16; return hexDigits[d1] + hexDigits[d2]; } public static String MD5Encode(String origin) { String resultString = null; try { resultString=new String(origin); MessageDigest md = MessageDigest.getInstance("MD5"); resultString=byteArrayToHexString(md.digest(resultString.getBytes())); } catch (Exception ex) {ex.printStackTrace();} return resultString; }//测试的主方法public static void main(String[] args) {String re = MD5Encode("123456");//需要加密的字符串System.out.println("加密后："+re);}}