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Quomodo decompressere files avi et lima per Java?

2024-07-12

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Tabula contentorum

Scientia puncta 1. usus

2. Codicis ostentationem (versio resoluta)

3. Code ostentationem (versio altiore)

Scientia puncta 1. usus

amnis 1.IO;

Input: input, files read per "input stream"

Output: output, scribe lima per "output stream"

2. File operatio related:

Classis fasciculi: viae ad lima et directoria repraesentabant.

FileInputStream et FileOutputStream: legere et scribere solebant files.

3. Cogo lima processus:

ZipInputStream: Input amnis legendi ZIP files compressi.

ZipEntry: Repraesentat ingressum (file vel presul) in tabella compressa cursualis.

4.Exception pertractatio:

FileNotFoundException: Praecipitatus cum limam accedere conatur quae non est.

IOExceptiones: exceptiones generales tractabant in operationibus initus et output.

RarException: Tractat exceptiones specificae ad operationes archivi RAR pertinentes.

5. Data input et output rivi;

InputStream: Input stream for reading data.

6. Collectio operationum;

List: A indicem ad informationem fasciculi reponendam header.

7. Comparator;Adsuesco assuesco lima header album.

8. FileUtils ordinis tertii in bibliotheca plebe-io;(Haec hydria sarcina est in fine articuli)

Usus est directoria delere et imitari rivos imaginum initus.

2. Codicis ostentationem (versio resoluta)

Gradus I: Determina tabella genus

  • Si fasciculus ".zip" est, methodum unzip() vocant ut limam ZIP deprimat.
  1. //指定文件夹
  2.     String Path = “D:\...\xxxx.zip”
  3.     String Path = “D:\...\xxxx.rar”
  4. }
  5. //1.判断文件类型
  6. 		if(path.endsWith(".zip")) {
  7. 			unzip(path);
  8. 		}else if(path.endsWith(".rar")) {
  9. 			unrar(path);
  10. 		}	
  11. 	}

Gradus II: Definire unzip () modum

  • Fons file objectum creat in initus file semita.
  • Determinare decompressum directorium radicis tramitem et objectum lima correspondens creare.
  • Si radix directorium iam exstat, experiri delendo (including usuraFileUtilsUtilitas classis directoria non vacua delet et postea directorium radicis recreat.
  • Partum initus amnis legendi ZIP format.
  • Iterare per ingressum (subtilem vel subdirectoriam) in archivo.
  • Facere correspondentem objectum lima pro sulum viscus.
  • Decernite utrum ingressum sit subtile vel subdirectorium, et tabellam an respectivum directorium crea.
  • Subtiles enim, fac rivum output, lege data ex input flumen et scribe subtile.
  • Fasciculus possibilis palpare non invenitur et exceptiones initus et output.
  1. //2.解压缩zip格式
  2. 	public static void unzip(String path) {
  3. 		//(1)根据原始路径(字符串),创建源文件(File对象)
  4. 		File sourceFile = new File(path);
  5. 		
  6. 		//(2)根目录
  7. 		String sourceName = sourceFile.getName();
  8. 		File rootDir = new File(sourceFile.getParent()+"\"+sourceName.substring(0,sourceName.lastIndexOf(".")));
  9. 		
  10. 		//(3)判断根目录是否已经存在
  11. 		if(rootDir.exists()) {
  12. 			//若存在，则删除
  13. 			rootDir.delete();//只能删除空目录
  14. 			//使用commons-io包提供的FileUtils工具类进行删除
  15. 			try {
  16. 				FileUtils.deleteDirectory(rootDir);
  17. 			} catch (IOException e) {
  18. 				e.printStackTrace();
  19. 			}
  20. 		}
  21. 		//(4)创建根目录
  22. 		rootDir.mkdir();
  23. 		
  24. 		//(5)ZipInputStream:用于进行zip格式的压缩输入流
  25. 		try {
  26. 			ZipInputStream in = new ZipInputStream(new FileInputStream(sourceFile));
  27. 			
  28. 			//(6)遍历压缩包中每个子文件子目录(zipEntry类型的对象)
  29. 			ZipEntry zipEntry = null;
  30. 			while((zipEntry = in.getNextEntry())!=null) {
  31. 				//(7)创建子文件子目录(File对象)
  32. 				File file = new File(rootDir.getPath()+"\"+zipEntry.getName());
  33. 				
  34. 				//(8)判断是子文件还是子目录(不是子目录就是子文件)
  35. 				if(zipEntry.isDirectory()) {
  36. 					//物理磁盘创建子目录
  37. 					file.mkdir();
  38. 				}else {
  39. 					//物理磁盘创建子文件
  40. 					file.createNewFile();
  41. 					//(9)子文件的写入
  42. 					//读取当前压缩包的子文件，并通过输出流out写入新子文件中
  43. 				try (FileOutputStream out = new FileOutputStream(file)) {
  44. 					
  45. 						byte[] buff = new byte[1024];
  46. 						int len = -1;
  47. 						while((len = in.read(buff))!=-1) {
  48. 							out.write(buff,0,len);
  49. 						}
  50. 					}
  51. 				}
  52. 			}
  53. 		} catch (FileNotFoundException e) {
  54. 			e.printStackTrace();
  55. 		} catch (IOException e) {
  56. 			e.printStackTrace();
  57. 		}
  58. 	}

Gradus III: Definire unrar () modum

  • Facere documentum objectum radicis indicis fundatur in initus RAR fasciculi semita.
  • Utrum directorium radicis existat et si existit, eam delere conare (ususFileUtilstractamus exceptiones possibiles) et tunc radix directorium crea.
  • Creare lima pro Lectio compressa RAR filesArchiveobjectum.
  • Omnia subdirectoria et subfiles in lima compressaFileHeaderobjectum et in indice conditum.
  • Elenchum subdirectoriarum et subfiliorum digerere nominat.
  • Iterare super se item in indiceFileHeaderobjectum.
  • secundumFileHeaderObject file creat correspondentes object.
  • Determinare utrum subdirectorium sit an subtile, et indicem vel fasciculum respective crea.
  • Pro subfiles, initus amnis et usus possideFileUtilsExemplar input flumen in subtilem.
  • Rar exceptiones relatas tractare posse et exceptiones initus et output.
  1. //3.解压缩rar格式
  2. 	public static void unrar(String path) {
  3. 		//(1)创建解压缩的根目录
  4. 		File rarFile = new File(path);
  5. 		File rootDir = new File(rarFile.getParent()+"\"+rarFile.getName().substring(0,rarFile.getName().lastIndexOf(".")));
  6. 		//(2)判断是否存在
  7. 		if(rootDir.exists()) {
  8. 			try {
  9. 				FileUtils.deleteDirectory(rootDir);
  10. 			} catch (IOException e) {
  11. 				e.printStackTrace();
  12. 			}
  13. 		}
  14. 		rootDir.mkdir();
  15. 		
  16. 		//(3)创建Archive对象，用于读取rar压缩文件格式
  17. 		try (Archive archive = new Archive(new FileInputStream(path))){
  18. 			
  19. 			//(4)获取压缩文件所有子目录子文件(FileHeader对象)
  20. 			List<FileHeader> fileheaderList = archive.getFileHeaders();
  21. 			
  22. 			//(5)按照子目录(子文件)名称排序
  23. 			fileheaderList.sort(new Comparator<FileHeader>() {
  24. 				@Override
  25. 				public int compare(FileHeader o1, FileHeader o2) {
  26. 					return o1.getFileName().compareTo(o2.getFileName());
  27. 				}
  28. 			});
  29. 			//(6)遍历子目录子文件
  30. 			for(FileHeader fd : fileheaderList) {
  31. 				File f = new File(rootDir.getPath()+"\"+fd.getFileName());
  32. 				
  33. 				if(fd.isDirectory()) {
  34. 					//物理磁盘创建子目录
  35. 					f.mkdir();
  36. 				}else {
  37. 					//物理磁盘创建子文件
  38. 					f.createNewFile();
  39. 					
  40. 					//获取压缩包中子文件输入流
  41. 					InputStream in = archive.getInputStream(fd);
  42. 					
  43. 					//复制文件输入流至子文件
  44. 					FileUtils.copyInputStreamToFile(in, f);
  45. 				}
  46. 			}
  47. 			
  48. 		} catch (RarException | IOException e) {
  49. 			e.printStackTrace();
  50. 		}
  51. 	}

3. Code ostentationem (versio altiore)

  1. import java.io.File;
  2. import java.io.FileInputStream;
  3. import java.io.FileNotFoundException;
  4. import java.io.FileOutputStream;
  5. import java.io.IOException;
  6. import java.io.InputStream;
  7. import java.util.Comparator;
  8. import java.util.List;
  9. import java.util.zip.ZipEntry;
  10. import java.util.zip.ZipInputStream;
  11.  
  12. import org.apache.commons.io.FileUtils;
  13.  
  14. import com.github.junrar.Archive;
  15. import com.github.junrar.exception.RarException;
  16. import com.github.junrar.rarfile.FileHeader;
  17.  
  18. public class Test {
  19. //指定文件夹
  20.     String Path = “D:\...\xxxx.zip”
  21.     String Path = “D:\...\xxxx.rar”
  22. }
  23. //1.判断文件类型
  24. 		if(path.endsWith(".zip")) {
  25. 			unzip(path);
  26. 		}else if(path.endsWith(".rar")) {
  27. 			unrar(path);
  28. 		}	
  29. 	}
  30. 	//2.解压缩zip格式
  31. 	public static void unzip(String path) {
  32. 		//(1)根据原始路径(字符串),创建源文件(File对象)
  33. 		File sourceFile = new File(path);
  34. 		
  35. 		//(2)根目录
  36. 		String sourceName = sourceFile.getName();
  37. 		File rootDir = new File(sourceFile.getParent()+"\"+sourceName.substring(0,sourceName.lastIndexOf(".")));
  38. 		
  39. 		//(3)判断根目录是否已经存在
  40. 		if(rootDir.exists()) {
  41. 			//若存在，则删除
  42. 			rootDir.delete();//只能删除空目录
  43. 			//使用commons-io包提供的FileUtils工具类进行删除
  44. 			try {
  45. 				FileUtils.deleteDirectory(rootDir);
  46. 			} catch (IOException e) {
  47. 				e.printStackTrace();
  48. 			}
  49. 		}
  50. 		//(4)创建根目录
  51. 		rootDir.mkdir();
  52. 		
  53. 		//(5)ZipInputStream:用于进行zip格式的压缩输入流
  54. 		try {
  55. 			ZipInputStream in = new ZipInputStream(new FileInputStream(sourceFile));
  56. 			
  57. 			//(6)遍历压缩包中每个子文件子目录(zipEntry类型的对象)
  58. 			ZipEntry zipEntry = null;
  59. 			while((zipEntry = in.getNextEntry())!=null) {
  60. 				//(7)创建子文件子目录(File对象)
  61. 				File file = new File(rootDir.getPath()+"\"+zipEntry.getName());
  62. 				
  63. 				//(8)判断是子文件还是子目录(不是子目录就是子文件)
  64. 				if(zipEntry.isDirectory()) {
  65. 					//物理磁盘创建子目录
  66. 					file.mkdir();
  67. 				}else {
  68. 					//物理磁盘创建子文件
  69. 					file.createNewFile();
  70. 					//(9)子文件的写入
  71. 					//读取当前压缩包的子文件，并通过输出流out写入新子文件中
  72. 				try (FileOutputStream out = new FileOutputStream(file)) {
  73. 					
  74. 						byte[] buff = new byte[1024];
  75. 						int len = -1;
  76. 						while((len = in.read(buff))!=-1) {
  77. 							out.write(buff,0,len);
  78. 						}
  79. 					}
  80. 				}
  81. 			}
  82. 		} catch (FileNotFoundException e) {
  83. 			e.printStackTrace();
  84. 		} catch (IOException e) {
  85. 			e.printStackTrace();
  86. 		}
  87. 	}
  88. 	//3.解压缩rar格式
  89. 	public static void unrar(String path) {
  90. 		//(1)创建解压缩的根目录
  91. 		File rarFile = new File(path);
  92. 		File rootDir = new File(rarFile.getParent()+"\"+rarFile.getName().substring(0,rarFile.getName().lastIndexOf(".")));
  93. 		//(2)判断是否存在
  94. 		if(rootDir.exists()) {
  95. 			try {
  96. 				FileUtils.deleteDirectory(rootDir);
  97. 			} catch (IOException e) {
  98. 				e.printStackTrace();
  99. 			}
  100. 		}
  101. 		rootDir.mkdir();
  102. 		
  103. 		//(3)创建Archive对象，用于读取rar压缩文件格式
  104. 		try (Archive archive = new Archive(new FileInputStream(path))){
  105. 			
  106. 			//(4)获取压缩文件所有子目录子文件(FileHeader对象)
  107. 			List<FileHeader> fileheaderList = archive.getFileHeaders();
  108. 			
  109. 			//(5)按照子目录(子文件)名称排序
  110. 			fileheaderList.sort(new Comparator<FileHeader>() {
  111. 				@Override
  112. 				public int compare(FileHeader o1, FileHeader o2) {
  113. 					return o1.getFileName().compareTo(o2.getFileName());
  114. 				}
  115. 			});
  116. 			//(6)遍历子目录子文件
  117. 			for(FileHeader fd : fileheaderList) {
  118. 				File f = new File(rootDir.getPath()+"\"+fd.getFileName());
  119. 				
  120. 				if(fd.isDirectory()) {
  121. 					//物理磁盘创建子目录
  122. 					f.mkdir();
  123. 				}else {
  124. 					//物理磁盘创建子文件
  125. 					f.createNewFile();
  126. 					
  127. 					//获取压缩包中子文件输入流
  128. 					InputStream in = archive.getInputStream(fd);
  129. 					
  130. 					//复制文件输入流至子文件
  131. 					FileUtils.copyInputStreamToFile(in, f);
  132. 				}
  133. 			}
  134. 			
  135. 		} catch (RarException | IOException e) {
  136. 			e.printStackTrace();
  137. 		}
  138. 	}
  139. }
  140.

4. Ritus missiones

Haec decompressione munera praebet pro lima in duas formas compressiones communes (ZIP et RAR). Iudicando formam initus fasciculi (iuxta limam extensionem) vocant modum decompressionis correspondentem (unzipor *unrar), recte contenta fasciculi compressi in certum presulem deprimere possunt.

Haec factura in multis missionibus utilissima est, ut:

  1. Datorum processus et analysis: Cum notitia in forma compressa obtinetur, necesse est ut deprimatur ad primas notitias processus et analysin obtinendas.
  2. Tabularii translationis ac repositionis: Per fasciculi translationem vel repono, pressio spatium servare potest et efficientiam translationis emendare, et deinde decompressere ad structuram primigeniam limae restituendam postquam destinatum pervenit.
  3. Software evolutionis: In processu evolutionis, necessariae ad processum et fasciculorum compressionem e diversis fontibus integrare.

Super, hic codex praebet viam flexibilem et reusable ut operationes decompressionis limarum ZIP et RAR compressarum tractandas praebet, necessitatibus occurrens limariorum compressorum processus in variis applicationibus.

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