文件存储时，如何使用MD5加密算法进行数据校验？

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javapackage com.cx.bank.util;

import java.security.MessageDigest;

public class MD5Util { public static String encode(byte[] source) { String s=null; char[] hexDigest={'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'}; try { MessageDigest md=MessageDigest.getInstance(MD5); md.update(source); byte[] bytes=md.digest(); char[] result=new char[bytes.length * 2]; for (int i=0, j=0; i >> 4]; result[j + 1]=hexDigest[v & 0x0F]; } s=new String(result); } catch (Exception e) { e.printStackTrace(); } return s; }}

package com.cx.bank.util; import java.security.MessageDigest; public class MD5Util { public static String encode(byte[] source){ String s=null; char hexDigest[]={'0','1','2','3','4','5','6','7' ,'8','9','a','b','c','d','e','f'}; try{ MessageDigest md= MessageDigest.getInstance("MD5"); md.update(source); byte tmp[] =md.digest(); char str[]=new char[32]; int k=0; for(int i=0;i<16;i++){ byte byte0=tmp[i]; str[k++]=hexDigest[byte0>>>4&0xf]; str[k++]=hexDigest[byte0&0xf]; } s=new String(str); }catch(Exception e){ e.printStackTrace(); } return s; } public static String getMD5(String source){ return (source==null ||"".equals(source)) ?"":encode(source.getBytes()); } }