java附件上传Aes加密，下载解密

最新推荐文章于 2024-10-22 14:12:33 发布

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最新推荐文章于 2024-10-22 14:12:33 发布 · 1.4k 阅读

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CC 4.0 BY-SA版权

该博客展示了如何使用Java实现AES算法对文件进行加密和解密操作，包括初始化Cipher、读写文件流和密钥生成等关键步骤。

package com.demo;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.CipherInputStream;
import javax.crypto.CipherOutputStream;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.KeyGenerator;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;

public class Aes {

   /**
   * 对文件进行AES加密
   *
   * @param sourceFile
   * @param fileType
   * @param sKey
   * @return
   */
   public static File encryptFile(File sourceFile, File encrypfile, String sKey) {

       InputStream inputStream = null;
       OutputStream outputStream = null;
       try {
           inputStream = new FileInputStream(sourceFile);

           outputStream = new FileOutputStream(encrypfile);
           Cipher cipher = initAESCipher(sKey, Cipher.ENCRYPT_MODE);
           // 以加密流写入文件
           CipherInputStream cipherInputStream = new CipherInputStream(
                   inputStream, cipher);
           byte[] cache = new byte[1024];
           int nRead = 0;
           while ((nRead = cipherInputStream.read(cache)) != -1) {
               outputStream.write(cache, 0, nRead);
               outputStream.flush();