使用java对文件或文件夹进行压缩和加密

使用Java对文件或文件夹的压缩, 解压, 加密和解密.  加解密类型使用的是AES.

使用zip对文件或文件夹进行压缩, 解压缩:

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
import java.util.zip.ZipOutputStream;

/**
 * 对文件或文件夹进行压缩和解压
 *
 */
public class ZipUtil {
	/**得到当前系统的分隔符*/
//	private static String separator = System.getProperty("file.separator");

	/**
	 * 添加到压缩文件中
	 * @param out
	 * @param f
	 * @param base
	 * @throws Exception
	 */
	private void directoryZip(ZipOutputStream out, File f, String base) throws Exception {
		// 如果传入的是目录
		if (f.isDirectory()) {
			File[] fl = f.listFiles();
			// 创建压缩的子目录
			out.putNextEntry(new ZipEntry(base + "/"));
			if (base.length() == 0) {
				base = "";
			} else {
				base = base + "/";
			}
			for (int i = 0; i < fl.length; i++) {
				directoryZip(out, fl[i], base + fl[i].getName());
			}
		} else {
			// 把压缩文件加入rar中
			out.putNextEntry(new ZipEntry(base));
			FileInputStream in = new FileInputStream(f);
			byte[] bb = new byte[10240];
			int aa = 0;
			while ((aa = in.read(bb)) != -1) {
				out.write(bb, 0, aa);
			}
			in.close();
		}
	}

	/**
	 * 压缩文件
	 * 
	 * @param zos
	 * @param file
	 * @throws Exception
	 */
	private void fileZip(ZipOutputStream zos, File file) throws Exception {
		if (file.isFile()) {
			zos.putNextEntry(new ZipEntry(file.getName()));
			FileInputStream fis = new FileInputStream(file);
			byte[] bb = new byte[10240];
			int aa = 0;
			while ((aa = fis.read(bb)) != -1) {
				zos.write(bb, 0, aa);
			}
			fis.close();
			System.out.println(file.getName());
		} else {
			directoryZip(zos, file, "");
		}
	}

	/**
	 * 解压缩文件
	 * 
	 * @param zis
	 * @param file
	 * @throws Exception
	 */
	private void fileUnZip(ZipInputStream zis, File file) throws Exception {
		ZipEntry zip = zis.getNextEntry();
		if (zip == null)
			return;
		String name = zip.getName();
		File f = new File(file.getAbsolutePath() + "/" + name);
		if (zip.isDirectory()) {
			f.mkdirs();
			fileUnZip(zis, file);
		} else {
			f.createNewFile();
			FileOutputStream fos = new FileOutputStream(f);
			byte b[] = new byte[10240];
			int aa = 0;
			while ((aa = zis.read(b)) != -1) {
				fos.write(b, 0, aa);
			}
			fos.close();
			fileUnZip(zis, file);
		}
	}
	
	/**
	 * 根据filePath创建相应的目录
	 * @param filePath
	 * @return
	 * @throws IOException
	 */
	private File mkdirFiles(String filePath) throws IOException{
		File file = new File(filePath);
		if(!file.getParentFile().exists()){
			file.getParentFile().mkdirs();
		}
		file.createNewFile();
		
		return file;
	}

	/**
	 * 对zipBeforeFile目录下的文件压缩，保存为指定的文件zipAfterFile
	 * 
	 * @param zipBeforeFile		压缩之前的文件
	 * @param zipAfterFile		压缩之后的文件
	 */
	public void zip(String zipBeforeFile, String zipAfterFile) {
		try {
			
			ZipOutputStream zos = new ZipOutputStream(new FileOutputStream(mkdirFiles(zipAfterFile)));
			fileZip(zos, new File(zipBeforeFile));
			zos.close();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	/**
	 * 解压缩文件unZipBeforeFile保存在unZipAfterFile目录下
	 * 
	 * @param unZipBeforeFile		解压之前的文件
	 * @param unZipAfterFile		解压之后的文件
	 */
	public void unZip(String unZipBeforeFile, String unZipAfterFile) {
		try {
			ZipInputStream zis = new ZipInputStream(new FileInputStream(unZipBeforeFile));
			File f = new File(unZipAfterFile);
			f.mkdirs();
			fileUnZip(zis, f);
			zis.close();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}

使用AES对文件的加解密:

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.security.Key;
import java.security.SecureRandom;

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

/**
 * 使用AES对文件进行加密和解密
 *
 */
public class CipherUtil {
	/**
	 * 使用AES对文件进行加密和解密
	 * 
	 */
	private static String type = "AES";

	/**
	 * 把文件srcFile加密后存储为destFile
	 * @param srcFile     加密前的文件
	 * @param destFile    加密后的文件
	 * @param privateKey  密钥
	 * @throws GeneralSecurityException
	 * @throws IOException
	 */
	public void encrypt(String srcFile, String destFile, String privateKey) throws GeneralSecurityException, IOException {
		Key key = getKey(privateKey);
		Cipher cipher = Cipher.getInstance(type + "/ECB/PKCS5Padding");
		cipher.init(Cipher.ENCRYPT_MODE, key);

		FileInputStream fis = null;
		FileOutputStream fos = null;
		try {
			fis = new FileInputStream(srcFile);
			fos = new FileOutputStream(mkdirFiles(destFile));

			crypt(fis, fos, cipher);
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			if (fis != null) {
				fis.close();
			}
			if (fos != null) {
				fos.close();
			}
		}
	}

	/**
	 * 把文件srcFile解密后存储为destFile
	 * @param srcFile     解密前的文件
	 * @param destFile    解密后的文件
	 * @param privateKey  密钥
	 * @throws GeneralSecurityException
	 * @throws IOException
	 */
	public void decrypt(String srcFile, String destFile, String privateKey) throws GeneralSecurityException, IOException {
		Key key = getKey(privateKey);
		Cipher cipher = Cipher.getInstance(type + "/ECB/PKCS5Padding");
		cipher.init(Cipher.DECRYPT_MODE, key);

		FileInputStream fis = null;
		FileOutputStream fos = null;
		try {
			fis = new FileInputStream(srcFile);
			fos = new FileOutputStream(mkdirFiles(destFile));

			crypt(fis, fos, cipher);
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			if (fis != null) {
				fis.close();
			}
			if (fos != null) {
				fos.close();
			}
		}
	}

	/**
	 * 根据filePath创建相应的目录
	 * @param filePath		要创建的文件路经
	 * @return	file		文件
	 * @throws IOException
	 */
	private File mkdirFiles(String filePath) throws IOException {
		File file = new File(filePath);
		if (!file.getParentFile().exists()) {
			file.getParentFile().mkdirs();
		}
		file.createNewFile();

		return file;
	}

	/**
	 * 生成指定字符串的密钥
	 * @param secret  		要生成密钥的字符串
	 * @return secretKey    生成后的密钥
	 * @throws GeneralSecurityException
	 */
	private static Key getKey(String secret) throws GeneralSecurityException {
		KeyGenerator kgen = KeyGenerator.getInstance(type);
		kgen.init(128, new SecureRandom(secret.getBytes()));
		SecretKey secretKey = kgen.generateKey();
		return secretKey;
	}

	/**
	 * 加密解密流
	 * @param in		加密解密前的流
	 * @param out		加密解密后的流
	 * @param cipher	加密解密
	 * @throws IOException
	 * @throws GeneralSecurityException
	 */
	private static void crypt(InputStream in, OutputStream out, Cipher cipher) throws IOException, GeneralSecurityException {
		int blockSize = cipher.getBlockSize() * 1000;
		int outputSize = cipher.getOutputSize(blockSize);

		byte[] inBytes = new byte[blockSize];
		byte[] outBytes = new byte[outputSize];

		int inLength = 0;
		boolean more = true;
		while (more) {
			inLength = in.read(inBytes);
			if (inLength == blockSize) {
				int outLength = cipher.update(inBytes, 0, blockSize, outBytes);
				out.write(outBytes, 0, outLength);
			} else {
				more = false;
			}
		}
		if (inLength > 0)
			outBytes = cipher.doFinal(inBytes, 0, inLength);
		else
			outBytes = cipher.doFinal();
		out.write(outBytes);
	}
}

对文件或文件夹进行压缩解压加密解密:

import java.io.File;
import java.util.UUID;

public class ZipCipherUtil {
	/**
	 * 对目录srcFile下的所有文件目录进行先压缩后加密,然后保存为destfile
	 * 
	 * @param srcFile
	 *            要操作的文件或文件夹
	 * @param destfile
	 *            压缩加密后存放的文件
	 * @param keyfile
	 *            密钥
	 */
	public void encryptZip(String srcFile, String destfile, String keyStr) throws Exception {
		File temp = new File(UUID.randomUUID().toString() + ".zip");
		temp.deleteOnExit();
		// 先压缩文件
		new ZipUtil().zip(srcFile, temp.getAbsolutePath());
		// 对文件加密
		new CipherUtil().encrypt(temp.getAbsolutePath(), destfile, keyStr);
		temp.delete();
	}

	/**
	 * 对文件srcfile进行先解密后解压缩,然后解压缩到目录destfile下
	 * 
	 * @param srcfile
	 *            要解密和解压缩的文件名 
	 * @param destfile
	 *            解压缩后的目录
	 * @param publicKey
	 *            密钥
	 */
	public void decryptUnzip(String srcfile, String destfile, String keyStr) throws Exception {
		File temp = new File(UUID.randomUUID().toString() + ".zip");
		temp.deleteOnExit();
		// 先对文件解密
		new CipherUtil().decrypt(srcfile, temp.getAbsolutePath(), keyStr);
		// 解压缩
		new ZipUtil().unZip(temp.getAbsolutePath(),destfile);
		temp.delete();
	}
	
	public static void main(String[] args) throws Exception {
		long l1 = System.currentTimeMillis();
		
		//加密
//		new ZipCipherUtil().encryptZip("d:\\test\\111.jpg", "d:\\test\\photo.zip", "12345");
		//解密
		new ZipCipherUtil().decryptUnzip("d:\\test\\photo.zip", "d:\\test\\111_1.jpg", "12345");
		
		long l2 = System.currentTimeMillis();
		System.out.println((l2 - l1) + "毫秒.");
		System.out.println(((l2 - l1) / 1000) + "秒.");
	}
}

评论

1 楼 fengzy001 2014-07-30  

兄弟你这个压缩后的文件使用系统的zip或winrar解压不了啊