import?java.io.*;
import?java.security.*;
import?java.util.*;
import?javax.crypto.*;

public?class?DESencryption?{
	Key?key;

	public?DESencryption（）?{
	}

	public?DESencryption（String?str）?throws?NoSuchAlgorithmException?{
		getKey（str）;//?用輸入的str生成key
	}

	//?用輸入的參數strKey和內置的DES表示的算法生成DES加密需要的的密鑰
	public?void?getKey（String?strKey）?throws?NoSuchAlgorithmException?{//?生成密鑰的函數
		KeyGenerator?keyGenerator?=?KeyGenerator.getInstance（“DES“）;
		keyGenerator.init（new?SecureRandom（strKey.getBytes（）））;
		this.key?=??keyGenerator.generateKey（）;
		keyGenerator?=?null;
	}

	/*
	?*?對文件oldFile加密保存到newFile中?oldFile?要加密的文件如E：/test1.txt?newFile
	?*?加密后的文件如E:/test2.txt
	?*/
	public?void?encrypt（String?oldFile?String?newFile）?throws?Exception?{
		Cipher?cipher?=?Cipher.getInstance（“DES“）;
		cipher.init（Cipher.ENCRYPT_MODE?this.key）;
		InputStream?is?=?new?FileInputStream（oldFile）;
		OutputStream?out?=?new?FileOutputStream（newFile）;
		CipherInputStream?cis?=?new?CipherInputStream（is?cipher）;
		byte[]?buffer?=?new?byte[1024];
		int?k;
		while?（（k?=?cis.read（buffer））?>?0）?{
			out.write（buffer?0?k）;
		}
		cis.close（）;
		is.close（）;
		out.close（）;
	}

	/*
	?*?對newFile解密保存到decFile中?newFile是待解密的文件?decFile是解密后的文件
	?*/
	public?void?decrypt（String?newFile?String?decFile）?throws?Exception?{
		Cipher?cipher?=?Cipher.getInstance（“DES“）;
		cipher.init（Cipher.DECRYPT_MODE?this.key）;
		InputStream?is?=?new?FileInputStream（newFile）;
		OutputStream?out?=?new?FileOutputStream（decFile）;
		CipherOutputStream?cos?=?new?CipherOutputStream（out?cipher）;
		byte[]?buffer?=?new?byte[1024];
		int?k;
		while?（（k?=?is.read（））?>=?0）?{
			cos.write（buffer?0?k）;
		}
		cos.close（）;
		out.close（）;
		is.close（）;
	}

	public?static?void?DES（）?throws?Exception?{
		System.out.println（“inuput?encrypted?password:?“）;
		Scanner?scan?=?new?Scanner（System.in）;
		String?encpasswordassword?=?scan.nextLine（）;?//?以上兩行用來實現字符串的輸入。
		DESencryption?desEncryption?=?new?DESencryption（encpasswordassword）;//?對稱加密的密碼所在
		System.out.println（“encrypt:?inuput?source?file?and?target?file:?“）;
		String?sourcee?=?scan.next（）;
		String?target?=?scan.next（）;
		desEncryption.encrypt（sourcee?target）;?//?加密
		System.out.println（“?encryption?is?complete！“）;
		System.out.println（“decrypt:inuput?decryptioned?password:“）;
		Scanner?scanf?=?new?Scanner（System.in）;
		String?decPassword?=?scanf.nextLine（）;
		DESencryption?tdd?=?new?DESencryption（decPassword）;
		System.out.println（“decrypt:?inuput?source?file?and?target?file:?“）;
		String?sourced?=?scan.next（）;
		String?targetd?=?scan.next（）;
		tdd.decrypt（sourced?targetd）;?//?解密
		System.out.println（“?decryption?is?complete“）;
	}
}

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2013-10-16?15:32??CommandLineFileManager\
?????文件?????????524??2013-10-15?17:15??CommandLineFileManager\.classpath
?????文件?????????398??2013-10-10?15:39??CommandLineFileManager\.project
?????目錄???????????0??2013-10-10?15:39??CommandLineFileManager\.settings\
?????文件?????????598??2013-10-10?15:39??CommandLineFileManager\.settings\org.eclipse.jdt.core.prefs
?????文件?????2000557??2013-07-08?20:18??CommandLineFileManager\ant.jar
?????目錄???????????0??2013-10-25?17:57??CommandLineFileManager\bin\
?????文件????????2280??2013-10-25?17:57??CommandLineFileManager\bin\CopyDirectory.class
?????文件????????1159??2013-10-25?17:57??CommandLineFileManager\bin\CopyFile.class
?????文件????????1417??2013-10-25?17:57??CommandLineFileManager\bin\CreateFile.class
?????文件????????1954??2013-10-25?17:57??CommandLineFileManager\bin\DeleteFile.class
?????文件????????3601??2013-10-25?17:57??CommandLineFileManager\bin\DESencryption.class
?????文件????????1051??2013-10-25?17:57??CommandLineFileManager\bin\EnterDirectory.class
?????文件????????3340??2013-10-25?17:57??CommandLineFileManager\bin\FileManager.class
?????文件????????3816??2013-10-25?17:57??CommandLineFileManager\bin\FileSorter.class
?????文件????????1390??2013-10-25?17:57??CommandLineFileManager\bin\ListDirectory.class
?????文件????????1098??2013-10-25?17:57??CommandLineFileManager\bin\ReName.class
?????文件????????3122??2013-10-25?17:57??CommandLineFileManager\bin\SplitImageUtil.class
?????文件????????5780??2013-10-25?17:57??CommandLineFileManager\bin\ZipUtil.class
?????文件??????140588??2013-10-16?14:28??CommandLineFileManager\CommandLineFileManager.jpg
?????文件??????245039??2013-10-15?17:13??CommandLineFileManager\junit-4.11.jar
?????目錄???????????0??2013-10-15?23:11??CommandLineFileManager\myfile\
?????目錄???????????0??2013-10-15?23:11??CommandLineFileManager\myfile\file3\
?????文件???????????0??2013-10-15?23:11??CommandLineFileManager\myfile\file3\456.txt
?????目錄???????????0??2013-10-15?17:02??CommandLineFileManager\src\
?????文件????????2845??2013-10-16?15:19??CommandLineFileManager\src\DESencryption.java
?????文件????????9080??2013-10-16?00:43??CommandLineFileManager\src\FileManager.java
?????文件????????4092??2013-10-16?00:43??CommandLineFileManager\src\FileSorter.java
?????文件????????3158??2013-10-16?00:43??CommandLineFileManager\src\SplitImageUtil.java
?????文件????????5841??2013-10-16?14:57??CommandLineFileManager\src\ZipUtil.java