java的md5加密实现代码，,import java.

java的md5加密实现代码，,import java.

import java.security.MessageDigest;  import java.security.NoSuchAlgorithmException;  public class Md5Code {      public String Md5(String plainText)      {          System.out.println("加密前:"+plainText);          try {              MessageDigest md = MessageDigest.getInstance("MD5");              md.update(plainText.getBytes());              byte[] b = md.digest();              int i;              StringBuffer buf = new StringBuffer("");              for (int offset = 0; offset < b.length; offset++)               {                  i = b[offset];                  if (i<0) i+=256;                  if(i<16)                  buf.append("0");                  buf.append(Integer.toHexString(i));              }              System.out.println("加密后："+buf.toString());              return buf.toString();          } catch (NoSuchAlgorithmException e) {              // TODO Auto-generated catch block              e.printStackTrace();          }          return plainText;      }  }