消息推送系统

import java.util.UUID;

import java.security.MessageDigest;

import java.nio.charset.StandardCharsets;

public class BidFileUtil {

// 文件加密方法

public static String encrypt(String filePath) throws Exception {

MessageDigest md = MessageDigest.getInstance("SHA-256");

byte[] fileContent = Files.readAllBytes(Paths.get(filePath));

md.update(fileContent);

return bytesToHex(md.digest());

}

private static String bytesToHex(byte[] hash) {

StringBuilder hexString = new StringBuilder();

for (byte b : hash) {

String hex = Integer.toHexString(0xff & b);

if (hex.length() == 1) {

hexString.append('0');

}

hexString.append(hex);

}

return hexString.toString();

}

// 创建唯一标识符

public static String generateUUID() {

return UUID.randomUUID().toString();

}

}

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