标签:md5
基础知识:
MessageDigest
FileInputStream
技巧while((len=in.read(buffer,0,1024))!=-1){
}
BigInteger
public static String getFileMD5(File file) { if (!file.isFile()) { return null; } MessageDigest digest = null; FileInputStream in = null; byte buffer[] = new byte[1024]; int len; try { digest = MessageDigest.getInstance("MD5"); in = new FileInputStream(file); while ((len = in.read(buffer, 0, 1024)) != -1) { digest.update(buffer, 0, len); } in.close(); } catch (Exception e) { e.printStackTrace(); return null; } BigInteger bigInt = new BigInteger(1, digest.digest()); return bigInt.toString(16); }
本文出自 “信息安全-数据库安全” 博客,请务必保留此出处http://fergusj.blog.51cto.com/8835051/1689700
标签:md5
原文地址:http://fergusj.blog.51cto.com/8835051/1689700