linux 文件md5加密後校驗

關於java應用MD5校驗文件和linux下md5Linux校驗文件結果一致問題。 https://blog.csdn.net/shareeyes/article/details/51983022



import lombok.extern.slf4j.Slf4j;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
@Slf4j
public class ByteToInputStream {

    public static InputStream byte2Input(byte[] buf) {
        return new ByteArrayInputStream(buf);
    }

    public static byte[] input2byte(InputStream inStream) throws IOException {
        log.info("input2byte = " + inStream.available());
        ByteArrayOutputStream swapStream = new ByteArrayOutputStream();
        byte[] buff = new byte[100];
        int rc = 0;
        while ((rc = inStream.read(buff, 0, 100)) > 0) {
            swapStream.write(buff, 0, rc);
        }
        byte[] in2b = swapStream.toByteArray();
        return in2b;
    }
}

package com.excloud.platform.util.ossClient;

import lombok.extern.slf4j.Slf4j;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
@Slf4j
public class Md5Util {

    /**
     * 對文件二進制進行加密 與shell環境md5sum做校驗
     * @param key
     * @return
     */
    public static String md5( byte[] key) {
        log.info("key = " + key);
        String cacheKey;
        try {
            final MessageDigest mDigest = MessageDigest.getInstance("MD5");
            mDigest.update(key);
            cacheKey = bytesToHexString(mDigest.digest());
        } catch (NoSuchAlgorithmException e) {
            cacheKey = String.valueOf(key.hashCode());
        }
        return cacheKey;
    }

    private static String bytesToHexString(byte[] bytes) {
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < bytes.length; i++) {
            String hex = Integer.toHexString(0xFF & bytes[i]);
            if (hex.length() == 1) {
                sb.append('0');
            }
            sb.append(hex);
        }
        return sb.toString();
    }
}