Java文件操作大全（绝对的经典，值得收藏！）
|
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 |
//1.创建文件夹 //import java.io.*; File myFolderPath = new File(str1); try { if (!myFolderPath.exists()) { myFolderPath.mkdir(); } } catch (Exception e) { System.out.println("新建目录操作出错"); e.printStackTrace(); } //2.创建文件 //import java.io.*; File myFilePath = new File(str1); try { if (!myFilePath.exists()) { myFilePath.createNewFile(); } FileWriter resultFile = new FileWriter(myFilePath); PrintWriter myFile = new PrintWriter(resultFile); myFile.println(str2); resultFile.close(); } catch (Exception e) { System.out.println("新建文件操作出错"); e.printStackTrace(); } //3.删除文件 //import java.io.*; File myDelFile = new File(str1); try { myDelFile.delete(); } catch (Exception e) { System.out.println("删除文件操作出错"); e.printStackTrace(); } //4.删除文件夹 //import java.io.*; File delFolderPath = new File(str1); try { delFolderPath.delete(); //删除空文件夹 } catch (Exception e) { System.out.println("删除文件夹操作出错"); e.printStackTrace(); } //5.删除一个文件下夹所有的文件夹 //import java.io.*; File delfile=new File(str1); File[] files=delfile.listFiles(); for(int i=0;i<files.length;i++){ if(files[i].isDirectory()){ files[i].delete(); } } //6.清空文件夹 //import java.io.*; File delfilefolder=new File(str1); try { if (!delfilefolder.exists()) { delfilefolder.delete(); } delfilefolder.mkdir(); } catch (Exception e) { System.out.println("清空目录操作出错"); e.printStackTrace(); } //7.读取文件 //import java.io.*; // 逐行读取数据 FileReader fr = new FileReader(str1); BufferedReader br = new BufferedReader(fr); String str2 = br.readLine(); while (str2 != null) { str3 str2 = br.readLine(); } br.close(); fr.close(); //8.写入文件 //import java.io.*; // 将数据写入文件 try { FileWriter fw = new FileWriter(str1); fw.write(str2); fw.flush(); fw.close(); } catch (IOException e) { e.printStackTrace(); } //9.写入随机文件 //import java.io.*; try { RandomAcessFile logFile=new RandomAcessFile(str1,"rw"); long lg=logFile.length(); logFile.seek(str2); logFile.writeByte(str3); }catch(IOException ioe){ System.out.println("无法写入文件："+ioe.getMessage()); } //10.读取文件属性 //import java.io.*; // 文件属性的取得 File f = new File(str1); if (af.exists()) { System.out.println(f.getName() + "的属性如下： 文件长度为：" + f.length()); System.out.println(f.isFile() ? "是文件" : "不是文件"); System.out.println(f.isDirectory() ? "是目录" : "不是目录"); System.out.println(f.canRead() ? "可读取" : "不"); System.out.println(f.canWrite() ? "是隐藏文件" : ""); System.out.println("文件夹的最后修改日期为：" + new Date(f.lastModified())); } else { System.out.println(f.getName() + "的属性如下："); System.out.println(f.isFile() ? "是文件" : "不是文件"); System.out.println(f.isDirectory() ? "是目录" : "不是目录"); System.out.println(f.canRead() ? "可读取" : "不"); System.out.println(f.canWrite() ? "是隐藏文件" : ""); System.out.println("文件的最后修改日期为：" + new Date(f.lastModified())); } if(f.canRead()){ str2 } if(f.canWrite()){ str3 } //11.写入属性 //import java.io.*; File filereadonly=new File(str1); try { boolean b=filereadonly.setReadOnly(); } catch (Exception e) { System.out.println("拒绝写访问："+e.printStackTrace()); } //12.枚举一个文件夹中的所有文件 //import java.io.*; //import java.util.*; LinkedList<String> folderList = new LinkedList<String>(); folderList.add(str1); while (folderList.size() > 0) { File file = new File(folderList.peek()); folderList.removeLast(); File[] files = file.listFiles(); ArrayList<File> fileList = new ArrayList<File>(); for (int i = 0; i < files.length; i++) { if (files[i].isDirectory()) { folderList.add(files[i].getPath()); } else { fileList.add(files[i]); } } for (File f : fileList) { str2=f.getAbsoluteFile(); str3 } } //13.复制文件夹 //import java.io.*; //import java.util.*; LinkedList<String> folderList = new LinkedList<String>(); folderList.add(str1); LinkedList<String> folderList2 = new LinkedList<String>(); folderList2.add(str2+ str1.substring(str1.lastIndexOf("\\"))); while (folderList.size() > 0) { (new File(folderList2.peek())).mkdirs(); // 如果文件夹不存在 则建立新文件夹 File folders = new File(folderList.peek()); String[] file = folders.list(); File temp = null; try { for (int i = 0; i < file.length; i++) { if (folderList.peek().endsWith(File.separator)) { temp = new File(folderList.peek() + File.separator + file[i]); } else { temp = new File(folderList.peek() + File.separator + file[i]); } if (temp.isFile()) { FileInputStream input = new FileInputStream(temp); FileOutputStream output = new FileOutputStream( folderList2.peek() + File.separator + (temp.getName()).toString()); byte[] b = new byte[5120]; int len; while ((len = input.read(b)) != -1) { output.write(b, 0, len); } output.flush(); output.close(); input.close(); } if (temp.isDirectory()) {// 如果是子文件夹 for (File f : temp.listFiles()) { if (f.isDirectory()) { folderList.add(f.getPath()); folderList2.add(folderList2.peek() + File.separator + f.getName()); } } } } } catch (Exception e) { //System.out.println("复制整个文件夹内容操作出错"); e.printStackTrace(); } folderList.removeFirst(); folderList2.removeFirst(); } //14.复制一个文件夹下所有的文件夹到另一个文件夹下 //import java.io.*; //import java.util.*; File copyfolders=new File(str1); File[] copyfoldersList=copyfolders.listFiles(); for(int k=0;k<copyfoldersList.length;k++){ if(copyfoldersList[k].isDirectory()){ ArrayList<String>folderList=new ArrayList<String>(); folderList.add(copyfoldersList[k].getPath()); ArrayList<String>folderList2=new ArrayList<String>(); folderList2.add(str2+"/"+copyfoldersList[k].getName()); for(int j=0;j<folderList.length;j++){ (new File(folderList2.get(j))).mkdirs(); //如果文件夹不存在 则建立新文件夹 File folders=new File(folderList.get(j)); String[] file=folders.list(); File temp=null; try { for (int i = 0; i < file.length; i++) { if(folderList.get(j).endsWith(File.separator)){ temp=new File(folderList.get(j)+"/"+file[i]); } else { temp=new File(folderList.get(j)+"/"+File.separator+file[i]); } FileInputStream input = new FileInputStream(temp); if(temp.isFile()){ FileInputStream input = new FileInputStream(temp); FileOutputStream output = new FileOutputStream(folderList2.get(j) + "/" + (temp.getName()).toString()); byte[] b = new byte[5120]; int len; while ( (len = input.read(b)) != -1) { output.write(b, 0, len); } output.flush(); output.close(); input.close(); } if(temp.isDirectory()){//如果是子文件夹 folderList.add(folderList.get(j)+"/"+file[i]); folderList2.add(folderList2.get(j)+"/"+file[i]); } } } catch (Exception e) { System.out.println("复制整个文件夹内容操作出错"); e.printStackTrace(); } } } } //15.移动文件夹 //import java.io.*; //import java.util.*; LinkedList<String> folderList = new LinkedList<String>(); folderList.add(str1); LinkedList<String> folderList2 = new LinkedList<String>(); folderList2.add(str2 + str1.substring(str1.lastIndexOf("\\"))); while (folderList.size() > 0) { (new File(folderList2.peek())).mkdirs(); // 如果文件夹不存在 则建立新文件夹 File folders = new File(folderList.peek()); String[] file = folders.list(); File temp = null; try { for (int i = 0; i < file.length; i++) { if (folderList.peek().endsWith(File.separator)) { temp = new File(folderList.peek() + File.separator + file[i]); } else { temp = new File(folderList.peek() + File.separator + file[i]); } if (temp.isFile()) { FileInputStream input = new FileInputStream(temp); FileOutputStream output = new FileOutputStream( folderList2.peek() + File.separator + (temp.getName()).toString()); byte[] b = new byte[5120]; int len; while ((len = input.read(b)) != -1) { output.write(b, 0, len); } output.flush(); output.close(); input.close(); if (!temp.delete()) System.out.println("删除单个文件操作出错!"); } if (temp.isDirectory()) {// 如果是子文件夹 for (File f : temp.listFiles()) { if (f.isDirectory()) { folderList.add(f.getPath()); folderList2.add(folderList2.peek() + File.separator + f.getName()); } } } } } catch (Exception e) { // System.out.println("复制整个文件夹内容操作出错"); e.printStackTrace(); } folderList.removeFirst(); folderList2.removeFirst(); } File f = new File(str1); if (!f.delete()) { for (File file : f.listFiles()) { if (file.list().length == 0) { System.out.println(file.getPath()); file.delete(); } } } //16.移动一个文件夹下所有的文件夹到另一个目录下 //import java.io.*; //import java.util.*; File movefolders=new File(str1); File[] movefoldersList=movefolders.listFiles(); for(int k=0;k<movefoldersList.length;k++){ if(movefoldersList[k].isDirectory()){ ArrayList<String>folderList=new ArrayList<String>(); folderList.add(movefoldersList[k].getPath()); ArrayList<String>folderList2=new ArrayList<String>(); folderList2.add(str2+"/"+movefoldersList[k].getName()); for(int j=0;j<folderList.length;j++){ (new File(folderList2.get(j))).mkdirs(); //如果文件夹不存在 则建立新文件夹 File folders=new File(folderList.get(j)); String[] file=folders.list(); File temp=null; try { for (int i = 0; i < file.length; i++) { if(folderList.get(j).endsWith(File.separator)){ temp=new File(folderList.get(j)+"/"+file[i]); } else{ temp=new File(folderList.get(j)+"/"+File.separator+file[i]); } FileInputStream input = new FileInputStream(temp); if(temp.isFile()){ FileInputStream input = new FileInputStream(temp); FileOutputStream output = new FileOutputStream(folderList2.get(j) + "/" + (temp.getName()).toString()); byte[] b = new byte[5120]; int len; while ( (len = input.read(b)) != -1) { output.write(b, 0, len); } output.flush(); output.close(); input.close(); temp.delete(); } if(temp.isDirectory()){//如果是子文件夹 folderList.add(folderList.get(j)+"/"+file[i]); folderList2.add(folderList2.get(j)+"/"+file[i]); } } } catch (Exception e) { System.out.println("复制整个文件夹内容操作出错"); e.printStackTrace(); } } movefoldersList[k].delete(); } } //17.以一个文件夹的框架在另一个目录创建文件夹和空文件 //import java.io.*; //import java.util.*; boolean b=false;//不创建空文件 ArrayList<String>folderList=new ArrayList<String>(); folderList.add(str1); ArrayList<String>folderList2=new ArrayList<String>(); folderList2.add(str2); for(int j=0;j<folderList.length;j++){ (new File(folderList2.get(j))).mkdirs(); //如果文件夹不存在 则建立新文件夹 File folders=new File(folderList.get(j)); String[] file=folders.list(); File temp=null; try { for (int i = 0; i < file.length; i++) { if(folderList.get(j).endsWith(File.separator)){ temp=new File(folderList.get(j)+"/"+file[i]); } else{ temp=new File(folderList.get(j)+"/"+File.separator+file[i]); } FileInputStream input = new FileInputStream(temp); if(temp.isFile()){ if (b) temp.createNewFile(); } if(temp.isDirectory()){//如果是子文件夹 folderList.add(folderList.get(j)+"/"+file[i]); folderList2.add(folderList2.get(j)+"/"+file[i]); } } } catch (Exception e) { System.out.println("复制整个文件夹内容操作出错"); e.printStackTrace(); } } //18.复制文件 //import java.io.*; int bytesum = 0; int byteread = 0; File oldfile = new File(str1); try { if (oldfile.exists()) { //文件存在时 FileInputStream inStream = new FileInputStream(oldfile); //读入原文件 FileOutputStream fs = new FileOutputStream(new File(str2,oldfile.getName())); byte[] buffer = new byte[5120]; int length; while ( (byteread = inStream.read(buffer)) != -1) { bytesum += byteread; //字节数 文件大小 System.out.println(bytesum); fs.write(buffer, 0, byteread); } inStream.close(); } } catch (Exception e) { System.out.println("复制单个文件操作出错"); e.printStackTrace(); } //19.复制一个文件夹下所有的文件到另一个目录 //import java.io.*; File copyfiles=new File(str1); File[] files=copyfiles.listFiles(); for(int i=0;i<files.length;i++){ if(!files[i].isDirectory()){ int bytesum = 0; int byteread = 0; try { InputStream inStream = new FileInputStream(files[i]); //读入原文件 FileOutputStream fs = new FileOutputStream(new File(str2,files[i].getName()); byte[] buffer = new byte[5120]; int length; while ( (byteread = inStream.read(buffer)) != -1) { bytesum += byteread; //字节数 文件大小 System.out.println(bytesum); fs.write(buffer, 0, byteread); } inStream.close(); } catch (Exception e) { System.out.println("复制单个文件操作出错"); e.printStackTrace(); } } } //20.提取扩展名 String str2=str1.substring(str1.lastIndexOf(".")+1); |
Comments | NOTHING