java 文件压缩和解压（ZipInputStream， ZipOutputStream）
最近在看java se 的IO 部分 ， 看到 java 的文件的压缩和解压比较有意思，主要用到了两个IO流-ZipInputStream， ZipOutputStream，不仅可以对文件进行压缩，还可以对文件夹进行压缩和解压。
ZipInputStream位于java.util.zip包下。下面是它的API，比较简单。
ZipOutputStream位于java.util.zip包下。下面是它的API，比较简单。
文件的压缩
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 }
文件夹的压缩
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 }
文件的解压
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 }
