java MD5加密文件
作者:互联网
import org.apache.commons.codec.binary.Hex;
import org.apache.commons.codec.digest.DigestUtils;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.security.MessageDigest;
public class Md5CaculateUtil {
/**
* 获取一个文件的md5值(可处理大文件)
* @return md5 value
*/
public static String getMD5(File file) {
FileInputStream fileInputStream = null;
try {
MessageDigest MD5 = MessageDigest.getInstance("MD5");
fileInputStream = new FileInputStream(file);
byte[] buffer = new byte[8192];
int length;
while ((length = fileInputStream.read(buffer)) != -1) {
MD5.update(buffer, 0, length);
}
return new String(Hex.encodeHex(MD5.digest()));
} catch (Exception e) {
e.printStackTrace();
return null;
} finally {
try {
if (fileInputStream != null){
fileInputStream.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
/**
* 求一个字符串的md5值
* @param target
* @return
*/
public static String MD5(String target) {
return DigestUtils.md5Hex(target);
}
public static void main(String[] args) {
long beginTime = System.currentTimeMillis();
File file = new File("F:\\DJI_0494.MP4");
String md5 = getMD5(file);
long endTime = System.currentTimeMillis();
System.out.println("MD5:" + md5 + "\n 耗时:" + ((endTime - beginTime) / 1000) + "s");
}
}
标签:加密,String,java,return,fileInputStream,import,MD5,md5 来源: https://www.cnblogs.com/weidaijie/p/16486689.html