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在Java中，獲取文件的MD5值是一種常見的需求，例如在文件校驗、數據一致性檢查等方面，MD5是一種廣泛使用的加密哈希函數，它可以生成一個128位（16字節(jié)）的哈希值，通常用32個十六進制數字表示，下面將介紹四種在Java中獲取文件MD5值的方法。

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方法一：使用java.security.MessageDigest類

java.security.MessageDigest類是Java提供的一個用于計算消息摘要的類，它可以實現多種摘要算法，包括MD5，以下是使用MessageDigest類計算文件MD5值的示例代碼：

import java.io.FileInputStream;
import java.io.IOException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
public class MD5Util {
    public static String getFileMD5(String filePath) throws IOException, NoSuchAlgorithmException {
        MessageDigest md = MessageDigest.getInstance("MD5");
        FileInputStream fis = new FileInputStream(filePath);
        byte[] buffer = new byte[1024];
        int len;
        while ((len = fis.read(buffer)) != -1) {
            md.update(buffer, 0, len);
        }
        fis.close();
        byte[] digest = md.digest();
        StringBuilder sb = new StringBuilder();
        for (byte b : digest) {
            sb.append(String.format("%02x", b));
        }
        return sb.toString();
    }
}

方法二：使用Apache Commons Codec庫

Apache Commons Codec庫提供了一種簡單的方式來計算文件的MD5值，需要添加Apache Commons Codec庫的依賴到項目中，可以使用DigestUtils類的md5Hex方法來計算文件的MD5值，以下是使用Apache Commons Codec庫計算文件MD5值的示例代碼：

import org.apache.commons.codec.digest.DigestUtils;
import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
public class MD5Util {
    public static String getFileMD5(String filePath) throws IOException {
        Path path = Paths.get(filePath);
        byte[] bytes = Files.readAllBytes(path);
        return DigestUtils.md5Hex(bytes);
    }
}

方法三：使用第三方庫Bouncy Castle

Bouncy Castle是一個開源的Java安全和密碼學庫，它提供了許多加密算法的實現，包括MD5，需要添加Bouncy Castle庫的依賴到項目中，可以使用org.bouncycastle.crypto.digests.MD5Digest類來計算文件的MD5值，以下是使用Bouncy Castle庫計算文件MD5值的示例代碼：

import org.bouncycastle.crypto.digests.MD5Digest;
import org.bouncycastle.util.encoders.Hex;
import java.io.FileInputStream;
import java.io.IOException;
import java.security.NoSuchAlgorithmException;
import java.security.Security;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.KeySpec;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.SecretKeySpec;
import java.math.BigInteger;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.security.*;
import java.util.*;
import javafx.util.*; // For Base64 encoding and decoding in JavaFX applications only! Use Java's built-in classes instead in non-JavaFX applications!
private static final int ITERATION_COUNT = 65536; // Number of times to hash the data before returning the result (more iterations can increase security but also slow down the process)
private static final int SALT_LENGTH = 8; // The length of the salt used for generating the key (must be at least 8 characters long)
private static final int KEY_LENGTH = 128; // The length of the key generated by hashing the data with the salt (must be at least 128 bits long)
private static final int PBE_ITERATION_COUNT = 65536; // Number of times to hash the data before returning the result (more iterations can increase security but also slow down the process)
private static final int PBE_SALT_LENGTH = 16; // The length of the salt used for generating the key (must be at least 16 characters long)
private static final int PBE_KEY_LENGTH = 128; // The length of the key generated by hashing the data with the salt (must be at least 128 bits long)
private static final String ALGORITHM = "PBKDF2WithHmacSHA1"; // The algorithm used to generate the key from the salt and password (must be a valid algorithm name)
private static final String CIPHER_ALGORITHM = "AES/CBC/PKCS7Padding"; // The algorithm used to encrypt and decrypt the data (must be a valid algorithm name)
private static final String PADDING_MODE = "PKCS7Padding"; // The mode used to pad the data before encryption or decryption (must be a valid mode name)
private static final String PROVIDER = "BC"; // The provider used to initialize the cryptographic objects (must be a valid provider name)
private static final char[] PASSWORD = "password".toCharArray(); // The password used to generate the key from the salt (must be at least 8 characters long) private static final byte[] SALT = "somesalt".getBytes(); // The salt used to generate the key from the password (must be at least 8 characters long) private static final byte[] IV = new byte[16]; // The initialization vector used for encryption and decryption (must be at least 16 bytes long) private static final SecretKeyFactory SECRET_KEY_FACTORY = SecretKeyFactory

當前名稱：詳解JAVA中獲取文件MD5值的四種方法
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