文件加密解密算法(Java源码)

文件加密解密算法(Java源码) java,file,算法,加密解密,java源码 package com.crypto.encrypt; import java.security.SecureRandom; import java.io.*; import javax.crypto.spec.DESKeySpec; import javax.crypto.SecretKey; import javax.crypto.SecretKeyFactory; import javax.crypto.Cipher; import java.security.InvalidKeyException; import java.security.NoSuchAlgorithmException; import java.security.spec.InvalidKeySpecException; import javax.crypto.NoSuchPaddingException; import javax.crypto.BadPaddingException; import javax.crypto.IllegalBlockSizeException; import java.lang.reflect.Constructor; import java.security.spec.KeySpec; import java.lang.reflect.InvocationTargetException; public class EncryptData { private String keyfile=null; public EncryptData() { } public EncryptData(String keyfile) { this.keyfile=keyfile; } /** * 加密文件 * @param filename String 源路径 * @param filenamekey String 加密后的路径 */ public void createEncryptData(String filename,String filenamekey) throws IllegalStateException, IllegalBlockSizeException, BadPaddingException, NoSuchPaddingException, InvalidKeySpecException, NoSuchAlgorithmException, InvalidKeyException, IOException, InstantiationException, IllegalAccessException, IllegalArgumentException, InvocationTargetException, NoSuchMethodException, SecurityException, ClassNotFoundException, IllegalStateException, IllegalBlockSizeException, BadPaddingException, NoSuchPaddingException, InvalidKeySpecException, NoSuchAlgorithmException, InvalidKeyException, IOException { //验证keyfile if(keyfile==null || keyfile.equals("")) { throw new NullPointerException("无效的key文件路径"); } encryptData(filename,filenamekey); } /** * 加密类文件 * @param filename String 原始的类文件 * @param encryptfile String 加密后的类文件 * @throws IOException * @throws InvalidKeyException * @throws NoSuchAlgorithmException * @throws InvalidKeySpecException * @throws NoSuchPaddingException * @thro