簡單實現了下：
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 | import javax.crypto.BadPaddingException;import javax.crypto.Cipher;import javax.crypto.KeyGenerator;import javax.crypto.SecretKey;import java.io.*;import java.security.GeneralSecurityException;import java.security.SecureRandom;/** * 文件/目錄加解密相關 * @author: Nemo * @date: 2019/3/19. */public class FileCrote { /** * 加密后的文件后綴 */ private static final String SUBFIX = ".enc"; /** * 執行路徑 */ private static String path = ""; /** * 執行模式 1加密 2解密 */ private static String mode = "1"; /** * 執行密碼 */ private static String pass = ""; private static String currentFilePath = null; /** * 根據路徑加密文件 * 1、如果是目錄，則找它下面的文件進行加密 * 2、如果是文件，則直接加密 * @param path * @throws IOException */ private static void encrypt(String path) throws IOException, GeneralSecurityException { System.out.println("開始處理"+path); File file = new File(path); if(!file.exists()){ System.out.println("需加密的路徑不存在:"+path); return; } if(file.isDirectory()){ //目錄則遍歷其下的文件 File[] files = file.listFiles(); if(files == null){ return; } for (File subFile : files) { encrypt(subFile.getAbsolutePath()); } }else{ //文件則直接加密 encrypt(file); } } /** * 文件加密 * @param file * @throws IOException */ private static void encrypt(File file) throws IOException, GeneralSecurityException { String path = file.getAbsolutePath(); if(path.endsWith(SUBFIX)){ System.out.println("已加密文件不需再次加密"+path); return; } String encFilePath = path + SUBFIX; File encFile = new File(encFilePath); System.out.println("開始加密文件"+path); encryptFile(file,encFile,Cipher.ENCRYPT_MODE); } /** * 加解密文件操作 * @param srcFile * @param encFile * @throws IOException */ private static void encryptFile(File srcFile, File encFile,int mode) throws IOException, GeneralSecurityException { if(!srcFile.exists()){ System.out.println("source file not exixt"); return; } currentFilePath = srcFile.getAbsolutePath(); //密碼 Cipher cipher = getCipher(mode); FileInputStream fis = null; FileOutputStream fos = null; try { fis = new FileInputStream(srcFile); fos = new FileOutputStream(encFile); //真正處理 crypt(fis, fos, cipher); } catch (IOException e) { e.printStackTrace(); } finally { if (fis != null) { fis.close(); } if (fos != null) { fos.close(); } } //源文件刪除 srcFile.delete(); } /** * 得到加解密Cipher * @param mode * @return * @throws GeneralSecurityException */ private static Cipher getCipher(int mode) throws GeneralSecurityException { String type = "AES"; Cipher cipher = Cipher.getInstance(type+"/ECB/PKCS5Padding"); KeyGenerator kgen = KeyGenerator.getInstance(type); kgen.init(128, new SecureRandom(pass.getBytes())); SecretKey key = kgen.generateKey(); cipher.init(mode,key); return cipher; } /** * 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); } /** * 根據路徑解密 * 1、如果是目錄，則找它下面的加密文件進行解密 * 2、如果是文件，并且它是加密文件，則直接解密 * @param path * @throws IOException */ private static void decrypt(String path) throws IOException, GeneralSecurityException { System.out.println("開始處理"+path); File file = new File(path); if(!file.exists()){ System.out.println("需解密的路徑不存在:"+path); return; } if(file.isDirectory()){ //目錄則遍歷其下的文件 File[] files = file.listFiles(); if(files == null){ return; } for (File subFile : files) { decrypt(subFile.getAbsolutePath()); } }else{ decrypt(file); } } /** * 文件解密 * @param file * @throws IOException */ private static void decrypt(File file) throws IOException, GeneralSecurityException { String path = file.getAbsolutePath(); if(!path.endsWith(SUBFIX)){ System.out.println("非加密文件不需解密"+path); return; } System.out.println("開始解密文件"+path); String newPath = path.substring(0,path.length() - SUBFIX.length()); encryptFile(file,new File(newPath),Cipher.DECRYPT_MODE); } /** * 字符串是否非空 * @param s * @return */ private static boolean isNotEmpty(String s){ if (s == null || "".equals(s)) { return false; } return true; } /** * 開始處理 * @throws IOException * @throws GeneralSecurityException */ private static void deal() throws IOException, GeneralSecurityException { while (true) { print(); BufferedReader reader = new BufferedReader(new InputStreamReader(System.in)); String s = reader.readLine(); if("path".equals(s)) { System.out.println("\r\n請輸入執行路徑\r\n"); while (true) { reader = new BufferedReader(new InputStreamReader(System.in)); s = reader.readLine(); if (!isNotEmpty(s)) { System.out.println("\r\n請輸入執行路徑\r\n"); continue; }else { File file = new File(s); if(!file.exists()){ System.out.println("\r\n該路徑不存在，請重新輸入\r\n"); continue; } } path = s; break; } } else if("pass".equals(s)) { System.out.println("\r\n請輸入加/解密密碼\r\n"); while (true) { reader = new BufferedReader(new InputStreamReader(System.in)); s = reader.readLine(); if (!isNotEmpty(s)) { System.out.println("\r\n請輸入加/解密密碼\r\n"); continue; } pass = s; break; } } else if ("1".equals(s)) { mode = s; System.out.println("\r\n當前已選模式：加密\n"); } else if ("2".equals(s)) { mode = s; System.out.println("\r\n當前已選模式：解密\r\n"); }else if("start".equals(s)){ if(!isNotEmpty(path)) { System.out.println("\r\n請輸入加/解密密碼再開始\r\n"); continue; } if(!isNotEmpty(pass)) { System.out.println("\r\n請輸入執行路徑后再開始\r\n"); continue; } if ("1".equals(mode)) { encrypt(path); System.out.println("\r\n\r\n操作完成\r\n\r\n"); } else { try { decrypt(path); System.out.println("\r\n\r\n操作完成\r\n\r\n"); }catch (BadPaddingException e) { System.out.println("文件："+currentFilePath+"解密失敗，密碼錯誤"); } } }else if("quit".equals(s)){ System.exit(-1); } else { System.out.println("\r\n輸入錯誤\r\n"); } } } /** * 輸出提示語 */ private static void print(){ System.out.println("\r\n" + "輸入path開始選擇執行路徑\r\n" + "輸入pass開始選擇加/解密密碼\r\n" + "輸入如下數字以選擇處理模式：1 加密 2 解密\r\n" + "輸入start則開始執行已選操作\r\n" + "輸入quit則退出程序\r\n" + "當前選擇路徑："+path+"\r\n" + "當前選擇模式："+mode+"\r\n" + "當前選擇密碼："+pass+"\r\n"); } public static void main(String args[]) throws IOException, GeneralSecurityException { deal(); }} |
以上就是JAVA 實現磁盤文件加解密操作的示例代碼的詳細內容，更多關于Java 文件加解密的資料請關注服務器之家其它相關文章！
原文鏈接：https://www.link-nemo.com/u/10001/post/80269
