content: package me.flyray.common.security;
    
  import java.io.UnsupportedEncodingException;
  import java.security.MessageDigest;
  import java.security.NoSuchAlgorithmException;
    
  public class Md5Util {
   public static void main(String[] args){
   System.out.println(getMd5String("毛颠三倒四，abasABASF"));
   System.out.println(MD5("毛颠三倒四，abasABASF"));
   }
  
    
   public final static String MD5(String s) {
   char hexDigits[] = { '0', '1', '2', '3', '4',
      '5', '6', '7', '8', '9',
      'A', 'B', 'C', 'D', 'E', 'F' };
   try {
    byte[] btInput = s.getBytes();
   //获得MD5摘要算法的 MessageDigest 对象
    MessageDigest mdInst = MessageDigest.getInstance("MD5");
   //使用指定的字节更新摘要
    mdInst.update(btInput);
   //获得密文
    byte[] md = mdInst.digest();
   //把密文转换成十六进制的字符串形式
    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) {
    e.printStackTrace();
    return null;
   }
   }
    
    
    
   public static String getMd5String(String str){
   MessageDigest messageDigest = null; 
     
   try { 
    messageDigest = MessageDigest.getInstance("MD5"); 
    
    messageDigest.reset(); 
    
    messageDigest.update(str.getBytes("UTF-8")); 
   } catch (NoSuchAlgorithmException e) { 
    System.out.println("NoSuchAlgorithmException caught!"); 
    System.exit(-1); 
   } catch (UnsupportedEncodingException e) { 
    e.printStackTrace(); 
   } 
    
   byte[] byteArray = messageDigest.digest(); 
    
   StringBuffer md5StrBuff = new StringBuffer(); 
    
   for (int i = 0; i < byteArray.length; i++) {  
    if (Integer.toHexString(0xFF & byteArray[i]).length() == 1) 
    md5StrBuff.append("0").append(Integer.toHexString(0xFF & byteArray[i])); 
    else
    md5StrBuff.append(Integer.toHexString(0xFF & byteArray[i])); 
   } 
    
   return md5StrBuff.toString(); 
   }
  }