java实现AES加密解密 -- 对文件的加密解密

对文件的加密解密

工具类：

package cn.com.dh.util;

import java.security.SecureRandom;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;

public class AesHelper {

	// 指定加密key
	private static String RANDOM_KEY="erdws32wq43e4r5t6fdszxdcvgbhjijkiu8iu9oplikjuyteq1qazxcbnmkbcdxs";
    
	// 获取默认加密cipher
	public static Cipher getEncryptCipher() throws Exception{
		return getCipher(Cipher.ENCRYPT_MODE);
	}
	// 获取默认解密cipher
	public static Cipher getDecryptCipher() throws Exception{
		return getCipher(Cipher.DECRYPT_MODE);
	}
	public static Cipher getCipher(int model) throws Exception{
			//1.获取加密生成器
			KeyGenerator ******=KeyGenerator.getInstance("AES");
	        //2.根据ecnodeRules规则初始化**生成器
	        //生成一个128位的随机源,根据传入的字节数组
	        ******.init(128, new SecureRandom(RANDOM_KEY.getBytes()));   
	        //3.产生原始对称**
	        SecretKey original_key=******.generateKey();
	        //4.获得原始对称**的字节数组
	        byte [] raw=original_key.getEncoded();
	        //5.根据字节数组生成AES**
	        SecretKey key=new SecretKeySpec(raw, "AES");
	        //6.根据指定算法AES自成密码器
	        Cipher cipher=Cipher.getInstance("AES");
	        //7.初始化密码器，第一个参数为加密(Encrypt_mode)或者解密解密(Decrypt_mode)操作，第二个参数为使用的KEY
	        cipher.init(model, key);
	        return cipher;
	}
}

加密、解密的实现

package cn.com.dh.util;

import javax.crypto.Cipher;
import javax.crypto.CipherInputStream;
import javax.crypto.CipherOutputStream;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import javax.imageio.ImageIO;

import lombok.extern.slf4j.Slf4j;

import java.io.*;
import java.math.BigDecimal;
import java.util.Arrays;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
import java.util.zip.ZipOutputStream;

import javax.crypto.BadPaddingException;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.KeyGenerator;
import javax.crypto.NoSuchPaddingException;
import java.security.SecureRandom;
import java.util.Base64;
import java.util.Scanner;

@Slf4j
public class EncryFileUtil {

	/**
    *
    * @param key     加密的密码
    * @param zipOutPath  压缩文件输出的路径
    * @param zipFilePath  要压缩的文件
    * @throws Exception
    */
   public static void encryptFile( String zipOutPath, String zipFilePath) throws Exception {
	   File file = new File(zipFilePath);
       OutputStream zipOutputPathStream = new FileOutputStream(new File(zipOutPath + File.separator + (file.getName()).toString()));

       Cipher cipher = AesHelper.getEncryptCipher();
       OutputStream cipherOutputStream = new CipherOutputStream(zipOutputPathStream, cipher);
       ZipOutputStream zipOutputStream = new ZipOutputStream(cipherOutputStream);
       zipOutputStream.putNextEntry(new ZipEntry(zipFilePath));

       InputStream fileInputStream = new FileInputStream(new File(zipFilePath));

       BufferedInputStream bis = new BufferedInputStream(fileInputStream);
       BufferedOutputStream bos = new BufferedOutputStream(zipOutputStream);

       byte[] bytes = new byte[1024];
       int len = 0;
       while ((len = bis.read(bytes)) != -1) {
           bos.write(bytes, 0, len
           );
       }
       bos.flush();
       bos.close();
       bis.close();
       fileInputStream.close();
       zipOutputStream.close();
       cipherOutputStream.close();
       zipOutputPathStream.close();

   }
	
	
   /**
   *
   * @param key  解密的密码
   * @param unZipPath   要解密的压缩文件路径
   * @param outFilePath 解密解压缩之后的文件路径
   * @throws Exception
   */
  public static void decryptFile( String unZipPath, String outFilePath) throws Exception{
      InputStream zipInputStream = new FileInputStream(new File(unZipPath));
      Cipher cipher = AesHelper.getDecryptCipher();
      CipherInputStream cipherInputStream = new CipherInputStream(zipInputStream, cipher);
      ZipInputStream decryptZipInputStream = new ZipInputStream(cipherInputStream);
      if (decryptZipInputStream.getNextEntry() == null) {
          return;
      }
      FileOutputStream fileOutputStream = new FileOutputStream(new File(outFilePath));
      BufferedInputStream bis = new BufferedInputStream(decryptZipInputStream);
      BufferedOutputStream bos = new BufferedOutputStream(fileOutputStream);
      byte[] bytes = new byte[1024];
      int len = 0;
      while ((len = bis.read(bytes)) != -1) {
          bos.write(bytes, 0, len);
      }
      bos.flush();
      bos.close();
      bis.close();
      fileOutputStream.close();
      decryptZipInputStream.close();
      cipherInputStream.close();
      zipInputStream.close();
  }
}