MD5工具类

import java.security.MessageDigest;  public class MD5Utils {     public final static String calc(String ss){//MD5加密算法         String s = ss == null ? "":ss;//如果为空，则返回""         char hexDigists[] = {'0','1','2','3','4','5','6','7','8','9','a','b','c','d',                 'e','f'};//字典         try {             byte[] strTemp =s.getBytes();//获取二进制             MessageDigest mdTemp =MessageDigest.getInstance("MD5");             mdTemp.update(strTemp);//执行加密             byte[] md = mdTemp.digest();//加密结果             int j = md.length;//结果长度             char str[] = new char[j*2];//字符数组             int k = 0;             for (int i = 0; i < j; i++) { //将二进制加密结果转化为字符                 byte byte0 = md[i];                 str[k++] = hexDigists[byte0 >>> 4 &0xf];                 str[k++] = hexDigists[byte0 & 0xf];             }             return new String(str);//输出加密后的字符         } catch (Exception e) {             // TODO Auto-generated catch block             return null;         }     } }

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文章来源: MD5工具类