主要是通过读取文件的字符流,然后赋值给MessageDigest对象,最后将文件流转换成16进制的字符串。
import java.io.File;import java.io.FileInputStream;import java.io.IOException;import java.math.BigInteger;import java.security.MessageDigest;import java.security.NoSuchAlgorithmException;public class FileUtils { private static final int BUFFER_SIZE = 1024; public static String getFileMd5(File file) { if (file == null || !file.isFile()) { return null; } MessageDigest digest; FileInputStream in; byte[] buffer = new byte[BUFFER_SIZE]; int len; try { digest = MessageDigest.getInstance("MD5"); in = new FileInputStream(file); while ((len = in.read(buffer, 0, BUFFER_SIZE)) != -1) { digest.update(buffer, 0, len); } in.close(); } catch (IOException | NoSuchAlgorithmException e) { System.out.println(e.getMessage()); return null; } BigInteger bigInt = new BigInteger(1, digest.digest()); return bigInt.toString(16); }}
来源地址:https://blog.csdn.net/qq_41688840/article/details/130517701