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