JAVA获取文件MD5

package cn.qitest.test;

import java.io.FileInputStream;
import java.security.MessageDigest;

public class FileMD5Test {

    public static void main(String[] args) throws Exception {
        MessageDigest md = MessageDigest.getInstance("MD5");
//        b5302d0a64fc86dd78833ae104f90b62
//        b5302d0a64fc86dd78833ae104f90b62
        FileInputStream fis = new FileInputStream("C:\Users\test\20210820092751.png");

        byte[] dataBytes = new byte[1024];

        int nread = 0;
        while ((nread = fis.read(dataBytes)) != -1) {
            md.update(dataBytes, 0, nread);
        };
        byte[] mdbytes = md.digest();
        StringBuffer sb = new StringBuffer();
        for (int i = 0; i < mdbytes.length; i++) {
            sb.append(Integer.toString((mdbytes[i] & 0xff) + 0x100, 16).substring(1));
        }
        System.out.println("Digest(in hex format):: " + sb.toString());
    }
}