Java implements zip decompression and javazip Decompression

Java implements zip decompression and javazip Decompression

The program implements ZIP compression. There are two parts: compression and decompression)

General functions include using JAVA core technologies such as polymorphism and recursion to compress and decompress a single file and any cascading folder. You must customize the source input path and target output path in the code.

1. package com. han; 2. 3. import java. io. *; 4. import java.util.zip. *; 5. 6. /** 7. * The program implements ZIP compression. There are two parts: compression and decompression. * <p> 9. * General functions include using JAVA core technologies such as polymorphism and recursion to compress and decompress a single file and any cascading folder. You must customize the source input path and target output path in the code. 10. * <p> 11. * In this code segment, the compression part is implemented. For the Decompression part, see Decompression in this package. 12.*13. * @ author HAN 14.*15. */16. 17. public class MyZipCompressing {18. private int k = 1; // defines the number of recursion variable 19. 20. public MyZipCompressing () {21. // TODO Auto-generated constructor stub 22 .} 23. 24. /** 25. * @ param args 26. */27. public static void main (String [] args) {28. // TODO Auto-generated method stub 29. myZipCompressing book = new MyZipCompressing (); 30. try {31. book.zip ("C: \ U Sers \ Gaowen \ Desktop \ ZipTestCompressing.zip ", 32. new File ("C :\\ Users \ Gaowen \ Documents \ Tencent Files"); 33 .} catch (Exception e) {34. // TODO Auto-generated catch block 35. e. printStackTrace (); 36 .} 37. 38 .} 39. 40. private void zip (String zipFileName, File inputFile) throws Exception {41. system. out. println ("compressing... "); 42. zipOutputStream out = new ZipOutputStream (new FileOutputStream (43. zipFileName); 44. bufferedOutputStream bo = new BufferedOutputStream (out); 45. zip (out, inputFile, inputFile. getName (), bo); 46. bo. close (); 47. out. close (); // close the output stream 48. system. out. println ("COMPRESSED"); 49 .} 50. 51. private void zip (ZipOutputStream out, File f, String base, 52. bufferedOutputStream bo) throws Exception {// method overload 53. if (f. isDirectory () {54. file [] fl = f. listFiles (); 55. if (f L. length = 0) {56. out. putNextEntry (new ZipEntry (base + "/"); // create a zip file and compress it into the base 57. system. out. println (base + "/"); 58 .} 59. for (int I = 0; I <fl. length; I ++) {60. zip (out, fl [I], base + "/" + fl [I]. getName (), bo); // recursively traverse subfolders 61 .} 62. system. out. println ("th" + k + "th recursion"); 63. k ++; 64 .} else {65. out. putNextEntry (new ZipEntry (base); // create a zip file and compress it into the base point 66. system. out. println (base); 67. fil EInputStream in = new FileInputStream (f); 68. BufferedInputStream bi = new BufferedInputStream (in); 69. int B; 70. while (B = bi. read ())! =-1) {71. bo. write (B); // write the byte stream to the current zip directory 72 .} 73. bi. close (); 74. in. close (); // close the input stream 75 .} 76 .} 77 .}

1. package com. han; 2. 3. import java. io. *; 4. import java.util.zip. *; 5./** 6. * implements ZIP compression. Divided into two parts: 7. * compression and decompression 8. * <p> 9. * General functions include using JAVA core technologies such as polymorphism and recursion to compress and decompress a single file and any cascading folder. 10. * You must customize the source input path and target output path in the code. 11. * <p> 12. * In this code segment, extract the compressed part. For the compressed part, see the compression part in this package. 13. * @ author HAN 14.*15. */16. public class CopyOfMyzipDecompressing {17. 18. public static void main (String [] args) {19. // TODO Auto-generated method stub 20. long startTime = System. currentTimeMillis (); 21. try {22. zipInputStream Zin = new ZipInputStream (new FileInputStream (23. "C: \ Users \ HAN \ Desktop \ stock \ SpectreCompressed.zip"); // enter the source zip path 24. bufferedInputStream Bin = new BufferedInpu TStream (Zin); 25. string Parent = "C :\\ Users \ HAN \ Desktop"; // output path (Folder directory) 26. file Fout = null; 27. zipEntry entry; 28. try {29. while (entry = Zin. getNextEntry ())! = Null &&! Entry. isDirectory () {30. Fout = new File (Parent, entry. getName (); 31. if (! Fout. exists () {32. (new File (Fout. getParent ())). mkdirs (); 33 .} 34. fileOutputStream out = new FileOutputStream (Fout); 35. bufferedOutputStream Bout = new BufferedOutputStream (out); 36. int B; 37. while (B = Bin. read ())! =-1) {38. bout. write (B); 39 .} 40. bout. close (); 41. out. close (); 42. system. out. println (Fout + "decompressed"); 43 .} 44. bin. close (); 45. zin. close (); 46 .} catch (IOException e) {47. // TODO Auto-generated catch block 48. e. printStackTrace (); 49 .} 50 .} catch (FileNotFoundException e) {51. // TODO Auto-generated catch block 52. e. printStackTrace (); 53 .} 54. long endTime = System. currentTimeMillis (); 55. system. out. println ("Time consumed:" + (endTime-startTime) + "ms"); 56 .} 57. 58 .}