java 文件壓縮和解壓（ZipInputStream， ZipOutputStream）

　　最近在看java se 的IO 部分 ， 看到 java 的文件的壓縮和解壓比較有意思，主要用到了兩個IO流-ZipInputStream， ZipOutputStream，不只能夠對文件進行壓縮，還能夠對文件夾進行壓縮和解壓。

　　ZipInputStream位於java.util.zip包下。下面是它的API，比較簡單。

 

 

ZipOutputStream位於java.util.zip包下。下面是它的API，比較簡單。

 

 

文件的壓縮

 1 public class TestFile  2 {  3     public static void main ( String [ ] args ) throws IOException  4  {  5         // new a file input stream
 6         FileInputStream fis = new FileInputStream (  7                 "/home/liangruihua/ziptest/1.txt" ) ;  8         BufferedInputStream bis = new BufferedInputStream ( fis ) ;  9 
10         // new a zipPutputStream 11         // /home/liangruihua/ziptest/1.zip -- the out put file path and 12         // name
13         ZipOutputStream zos = new ZipOutputStream ( 14                 new FileOutputStream ( 15                         "/home/liangruihua/ziptest/1.zip" ) ) ; 16         BufferedOutputStream bos = new BufferedOutputStream ( zos ) ; 17 
18         // set the file name in the .zip file
19         zos.putNextEntry ( new ZipEntry ( "1.txt" ) ) ; 20 
21         // set the declear
22         zos.setComment ( "by liangruihua test!" ) ; 23 
24         byte [ ] b = new byte [ 100 ] ; 25         while ( true ) 26  { 27             int len = bis.read ( b ) ; 28             if ( len == - 1 ) 29                 break ; 30             bos.write ( b , 0 , len ) ; 31  } 32  fis.close ( ) ; 33  zos.close ( ) ; 34  } 35 }

 

文件夾的壓縮

 1 public class TestDir  2 {  3     public static void main ( String [ ] args ) throws IOException  4  {  5         // the file path need to compress
 6         File file = new File ( "/home/liangruihua/ziptest/test" ) ;  7         ZipOutputStream zos = new ZipOutputStream (  8                 new FileOutputStream (  9                         "/home/liangruihua/ziptest/test.zip" ) ) ; 10 
11         // judge the file is the directory
12         if ( file.isDirectory ( ) ) 13  { 14             // get the every file in the directory
15             File [ ] files = file.listFiles ( ) ; 16 
17             for ( int i = 0 ; i < files.length ; i ++ ) 18  { 19                 // new the BuuferedInputStream
20                 BufferedInputStream bis = new BufferedInputStream ( 21                         new FileInputStream ( 22  files [ i ] ) ) ; 23                 // the file entry ,set the file name in the zip 24                 // file
25                 zos.putNextEntry ( new ZipEntry ( file 26  .getName ( ) 27                         + file.separator 28                         + files [ i ].getName ( ) ) ) ; 29                 while ( true ) 30  { 31                     byte [ ] b = new byte [ 100 ] ; 32                     int len = bis.read ( b ) ; 33                     if ( len == - 1 ) 34                         break ; 35                     zos.write ( b , 0 , len ) ; 36  } 37 
38                 // close the input stream
39  bis.close ( ) ; 40  } 41 
42  } 43         // close the zip output stream
44  zos.close ( ) ; 45  } 46 }

文件的解壓

 1 public class TestZipInputStream  2 {  3     public static void main ( String [ ] args ) throws ZipException ,  4  IOException  5  {  6         // get a zip file instance
 7         File file = new File ( "/home/liangruihua/ziptest/test.zip" ) ;  8 
 9         // get a ZipFile instance
10         ZipFile zipFile = new ZipFile ( file ) ; 11 
12         // create a ZipInputStream instance
13         ZipInputStream zis = new ZipInputStream ( new FileInputStream ( 14  file ) ) ; 15 
16         // create a ZipEntry instance , lay the every file from 17         // decompress file temporarily
18         ZipEntry entry = null ; 19 
20         // a circle to get every file
21         while ( ( entry = zis.getNextEntry ( ) ) != null ) 22  { 23             System.out.println ( "decompress file :"
24                     + entry.getName ( ) ) ; 25 
26             // define the path to set the file
27             File outFile = new File ( "/home/liangruihua/ziptest/"
28                     + entry.getName ( ) ) ; 29 
30             // if the file's parent directory wasn't exits ,than 31             // create the directory
32             if ( ! outFile.getParentFile ( ).exists ( ) ) 33  { 34  outFile.getParentFile ( ).mkdir ( ) ; 35  } 36 
37             // if the file not exits ,than create the file
38             if ( ! outFile.exists ( ) ) 39  { 40  outFile.createNewFile ( ) ; 41  } 42 
43             // create an input stream
44             BufferedInputStream bis = new BufferedInputStream ( 45  zipFile.getInputStream ( entry ) ) ; 46 
47             // create an output stream
48             BufferedOutputStream bos = new BufferedOutputStream ( 49                     new FileOutputStream ( outFile ) ) ; 50             byte [ ] b = new byte [ 100 ] ; 51             while ( true ) 52  { 53                 int len = bis.read ( b ) ; 54                 if ( len == - 1 ) 55                     break ; 56                 bos.write ( b , 0 , len ) ; 57  } 58             // close stream
59  bis.close ( ) ; 60  bos.close ( ) ; 61  } 62  zis.close ( ) ; 63 
64  } 65 }