JAVA 文件压缩和解压（ZIPINPUTSTREAM， ZIPOUTPUTSTREAM）

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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。

文件的压缩

public class TestFile{    public static void main ( String [ ] args ) throws IOException    {        // new a file input stream        FileInputStream fis = new FileInputStream (                "/home/liangruihua/ziptest/1.txt" ) ;        BufferedInputStream bis = new BufferedInputStream ( fis ) ;        // new a zipPutputStream        // /home/liangruihua/ziptest/1.zip -- the out put file path and        // name        ZipOutputStream zos = new ZipOutputStream (                new FileOutputStream (                        "/home/liangruihua/ziptest/1.zip" ) ) ;        BufferedOutputStream bos = new BufferedOutputStream ( zos ) ;        // set the file name in the .zip file        zos.putNextEntry ( new ZipEntry ( "1.txt" ) ) ;        // set the declear        zos.setComment ( "by liangruihua test!" ) ;        byte [ ] b = new byte [ 100 ] ;        while ( true )        {            int len = bis.read ( b ) ;            if ( len == - 1 )                break ;            bos.write ( b , 0 , len ) ;        }        fis.close ( ) ;        zos.close ( ) ;    }}

文件夹的压缩

public class TestDir{    public static void main ( String [ ] args ) throws IOException    {        // the file path need to compress        File file = new File ( "/home/liangruihua/ziptest/test" ) ;        ZipOutputStream zos = new ZipOutputStream (                new FileOutputStream (                        "/home/liangruihua/ziptest/test.zip" ) ) ;        // judge the file is the directory        if ( file.isDirectory ( ) )        {            // get the every file in the directory            File [ ] files = file.listFiles ( ) ;            for ( int i = 0 ; i < files.length ; i ++ )            {                // new the BuuferedInputStream                BufferedInputStream bis = new BufferedInputStream (                        new FileInputStream (                                files [ i ] ) ) ;                // the file entry ,set the file name in the zip                // file                zos.putNextEntry ( new ZipEntry ( file                        .getName ( )                        + file.separator                        + files [ i ].getName ( ) ) ) ;                while ( true )                {                    byte [ ] b = new byte [ 100 ] ;                    int len = bis.read ( b ) ;                    if ( len == - 1 )                        break ;                    zos.write ( b , 0 , len ) ;                }                // close the input stream                bis.close ( ) ;            }        }        // close the zip output stream        zos.close ( ) ;    }}

文件的解压

public class TestZipInputStream{    public static void main ( String [ ] args ) throws ZipException ,            IOException    {        // get a zip file instance        File file = new File ( "/home/liangruihua/ziptest/test.zip" ) ;        // get a ZipFile instance        ZipFile zipFile = new ZipFile ( file ) ;        // create a ZipInputStream instance        ZipInputStream zis = new ZipInputStream ( new FileInputStream (                file ) ) ;        // create a ZipEntry instance , lay the every file from        // decompress file temporarily        ZipEntry entry = null ;        // a circle to get every file        while ( ( entry = zis.getNextEntry ( ) ) != null )        {            System.out.println ( "decompress file :"                    + entry.getName ( ) ) ;            // define the path to set the file            File outFile = new File ( "/home/liangruihua/ziptest/"                    + entry.getName ( ) ) ;            // if the file's parent directory wasn't exits ,than            // create the directory            if ( ! outFile.getParentFile ( ).exists ( ) )            {                outFile.getParentFile ( ).mkdir ( ) ;            }            // if the file not exits ,than create the file            if ( ! outFile.exists ( ) )            {                outFile.createNewFile ( ) ;            }            // create an input stream            BufferedInputStream bis = new BufferedInputStream (                    zipFile.getInputStream ( entry ) ) ;            // create an output stream            BufferedOutputStream bos = new BufferedOutputStream (                    new FileOutputStream ( outFile ) ) ;            byte [ ] b = new byte [ 100 ] ;            while ( true )            {                int len = bis.read ( b ) ;                if ( len == - 1 )                    break ;                bos.write ( b , 0 , len ) ;            }            // close stream            bis.close ( ) ;            bos.close ( ) ;        }        zis.close ( ) ;    }}

本文转载自：博客园文章：JAVA 文件压缩和解压（ZIPINPUTSTREAM， ZIPOUTPUTSTREAM）

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