java md5加密

package org.sxj.utils;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 blocke.printStackTrace();}return plainText;}}