MD5和sha1加密

Sha1

public static String getSha1(String str){

                 if(str==null||str.length()==0){

                     return null;

                 }

                 char hexDigits[] = {'0','1','2','3','4','5','6','7','8','9',

                         'a','b','c','d','e','f'};

                 try {

                     MessageDigest mdTemp = MessageDigest.getInstance("SHA1");

                     mdTemp.update(str.getBytes("UTF-8"));

 

                     byte[] md = mdTemp.digest();

                     int j = md.length;

                     char buf[] = new char[j*2];

                     int k = 0;

                     for (int i = 0; i < j; i++) {

                         byte byte0 = md[i];

                         buf[k++] = hexDigits[byte0 >>> 4 & 0xf];

                         buf[k++] = hexDigits[byte0 & 0xf];

                     }

                     return new String(buf);

                 } catch (Exception e) {

                     return null;

                 }

             }

 

MD5

public static String EncoderByMd5(String str) throws NoSuchAlgorithmException, UnsupportedEncodingException{

                           //确定计算方法

                 MessageDigest md5=MessageDigest.getInstance("MD5");

                 BASE64Encoder base64en = new BASE64Encoder();

                 //加密后的字符串

                 String newstr=base64en.encode(md5.digest(str.getBytes("utf-8")));

                 return newstr;

           }