【开发笔记】- MD5加密

主要用于对用户密码的加密，保护用户账户安全：

 /**
  * @author shenruihai
  *
  */

 import java.security.MessageDigest;

 import org.apache.commons.logging.Log;

 public class Md5 {
     Log log;

     public static String getMd5(String s) {
         char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };

         try {
             byte[] strTemp = s.getBytes();
             MessageDigest mdTemp = MessageDigest.getInstance("md5");
             mdTemp.update(strTemp);
             byte[] md = mdTemp.digest();
             int j = md.length;
             char str[] = new char[j * 2];
             int k = 0;
             for (int i = 0; i < j; i++) {
                 byte byte0 = md[i];
                 str[k++] = hexDigits[byte0 >>> 4 & 0xf];
                 str[k++] = hexDigits[byte0 & 0xf];
             }
             return new String(str);
         } catch (Exception e) {
             return null;
         }
     }

     /**
      * 标准MD5加密
      *
      * @param inStr
      * @return
      * @throws Exception
      */
     public static String toMD5(String inStr) {
         StringBuffer sb = new StringBuffer();
         try {
             MessageDigest md = MessageDigest.getInstance("MD5");
             md.update(inStr.getBytes());
             byte b[] = md.digest();
             int i;
             for (int offset = 0; offset < b.length; offset++) {
                 i = b[offset];
                 if (i < 0)
                     i += 256;
                 if (i < 16)
                     sb.append("0");
                 sb.append(Integer.toHexString(i));
             }
         } catch (Exception e) {
             return null;
             //            e.printStackTrace();
         }
         return sb.toString().toUpperCase();
     }

     public static void main(String[] args) throws Exception {
         System.out.println(toMD5("MATICSOFT").toUpperCase());
     }
 }