http://panshaobinsb.iteye.com/blog/1566231

下面是網上的代碼
http://www.iteye.com/topic/894879

Java代碼 ?

import?java.io.FileInputStream;? ??

import?java.io.FileNotFoundException;? ??

import?java.io.FileOutputStream;? ??

import?java.io.IOException;? ??

import?java.util.zip.GZIPOutputStream;? ??

??

??

public?class?CompressFileGZIP?{? ??

private?static?void?doCompressFile(String?inFileName)?{? ??

?? ??

????????try?{? ??

???????? ??

????????????System.out.println("Creating?the?GZIP?output?stream.");? ??

????????????String?outFileName?=?inFileName?+?".gz";? ??

????????????GZIPOutputStream?out?=?null;? ??

????????????try?{? ??

????????????????out?=?new?GZIPOutputStream(new?FileOutputStream(outFileName));? ??

????????????}?catch(FileNotFoundException?e)?{? ??

????????????????System.err.println("Could?not?create?file:?"?+?outFileName);? ??

????????????????System.exit(1);? ??

????????????}? ??

???????????????????? ??

?? ??

????????????System.out.println("Opening?the?input?file.");? ??

????????????FileInputStream?in?=?null;? ??

????????????try?{? ??

????????????????in?=?new?FileInputStream(inFileName);? ??

????????????}?catch?(FileNotFoundException?e)?{? ??

????????????System.err.println("File?not?found.?"?+?inFileName);? ??

????????????????System.exit(1);? ??

????????????}? ??

??

????????????System.out.println("Transfering?bytes?from?input?file?to?GZIP?Format.");? ??

????????????byte[]?buf?=?new?byte[1024];? ??

????????????int?len;? ??

????????????while((len?=?in.read(buf))?>?0)?{? ??

????????????????out.write(buf,?0,?len);? ??

????????????}? ??

????????????in.close();? ??

??

????????????System.out.println("Completing?the?GZIP?file");? ??

????????????out.finish();? ??

????????????out.close();? ??

???????? ??

????????}?catch?(IOException?e)?{? ??

????????????e.printStackTrace();? ??

????????????System.exit(1);? ??

????????}? ??

??

????}? ??

??

????/**? ?

?????*?Sole?entry?point?to?the?class?and?application.? ?

?????*?@param?args?Array?of?String?arguments.? ?

?????*/? ??

????public?static?void?main(String[]?args)?{? ??

????String?str="E:\\AUTORUN.INF";? ??

???????? ??

????????????doCompressFile(str);? ??

???????? ??

?? ??

????????????? ??

????}? ??

}???

import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.util.zip.GZIPOutputStream; public class CompressFileGZIP { private static void doCompressFile(String inFileName) { try { System.out.println("Creating the GZIP output stream."); String outFileName = inFileName + ".gz"; GZIPOutputStream out = null; try { out = new GZIPOutputStream(new FileOutputStream(outFileName)); } catch(FileNotFoundException e) { System.err.println("Could not create file: " + outFileName); System.exit(1); } System.out.println("Opening the input file."); FileInputStream in = null; try { in = new FileInputStream(inFileName); } catch (FileNotFoundException e) { System.err.println("File not found. " + inFileName); System.exit(1); } System.out.println("Transfering bytes from input file to GZIP Format."); byte[] buf = new byte[1024]; int len; while((len = in.read(buf)) > 0) { out.write(buf, 0, len); } in.close(); System.out.println("Completing the GZIP file"); out.finish(); out.close(); } catch (IOException e) { e.printStackTrace(); System.exit(1); } } /** * Sole entry point to the class and application. * @param args Array of String arguments. */ public static void main(String[] args) { String str="E:\\AUTORUN.INF"; doCompressFile(str); } }

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Java代碼 ?

import?java.util.zip.GZIPInputStream;? ??

import?java.io.FileOutputStream;? ??

import?java.io.FileInputStream;? ??

import?java.io.FileNotFoundException;? ??

import?java.io.IOException;? ??

??

public?class?UncompressFileGZIP?{? ??

??

????/**? ?

?????*?Uncompress?the?incoming?file.? ?

?????*?@param?inFileName?Name?of?the?file?to?be?uncompressed? ?

?????*/? ??

????private?static?void?doUncompressFile(String?inFileName)?{? ??

??

????????try?{? ??

??

????????????if?(!getExtension(inFileName).equalsIgnoreCase("gz"))?{? ??

????????????????System.err.println("File?name?must?have?extension?of?\".gz\"");? ??

????????????????System.exit(1);? ??

????????????}? ??

??

????????????System.out.println("Opening?the?compressed?file.");? ??

????????????GZIPInputStream?in?=?null;? ??

????????????try?{? ??

????????????????in?=?new?GZIPInputStream(new?FileInputStream(inFileName));? ??

????????????}?catch(FileNotFoundException?e)?{? ??

????????????????System.err.println("File?not?found.?"?+?inFileName);? ??

????????????????System.exit(1);? ??

????????????}? ??

??

????????????System.out.println("Open?the?output?file.");? ??

????????????String?outFileName?=?getFileName(inFileName);? ??

????????????FileOutputStream?out?=?null;? ??

???????????try?{? ??

????????????????out?=?new?FileOutputStream(outFileName);? ??

????????????}?catch?(FileNotFoundException?e)?{? ??

????????????????System.err.println("Could?not?write?to?file.?"?+?outFileName);? ??

????????????????System.exit(1);? ??

????????????}? ??

??

????????????System.out.println("Transfering?bytes?from?compressed?file?to?the?output?file.");? ??

????????????byte[]?buf?=?new?byte[1024];? ??

????????????int?len;? ??

????????????while((len?=?in.read(buf))?>?0)?{? ??

????????????????out.write(buf,?0,?len);? ??

????????????}? ??

??

????????????System.out.println("Closing?the?file?and?stream");? ??

????????????in.close();? ??

????????????out.close();? ??

???????? ??

????????}?catch?(IOException?e)?{? ??

????????????e.printStackTrace();? ??

????????????System.exit(1);? ??

????????}? ??

??

????}? ??

??

????/**? ?

?????*?Used?to?extract?and?return?the?extension?of?a?given?file.? ?

?????*?@param?f?Incoming?file?to?get?the?extension?of? ?

?????*?@return?<code>String</code>?representing?the?extension?of?the?incoming? ?

?????*?????????file.? ?

?????*/? ??

????public?static?String?getExtension(String?f)?{? ??

????????String?ext?=?"";? ??

????????int?i?=?f.lastIndexOf('.');? ??

??

????????if?(i?>?0?&&??i?<?f.length()?-?1)?{? ??

????????????ext?=?f.substring(i+1);? ??

????????}?????? ??

????????return?ext;? ??

????}? ??

??

????/**? ?

?????*?Used?to?extract?the?filename?without?its?extension.? ?

?????*?@param?f?Incoming?file?to?get?the?filename? ?

?????*?@return?<code>String</code>?representing?the?filename?without?its? ?

?????*?????????extension.? ?

?????*/? ??

????public?static?String?getFileName(String?f)?{? ??

????????String?fname?=?"";? ??

????????int?i?=?f.lastIndexOf('.');? ??

??

????????if?(i?>?0?&&??i?<?f.length()?-?1)?{? ??

????????????fname?=?f.substring(0,i);? ??

????????}?????? ??

????????return?fname;? ??

????}? ??

??

????/**? ?

?????*?Sole?entry?point?to?the?class?and?application.? ?

?????*?@param?args?Array?of?String?arguments.? ?

?????*/? ??

????public?static?void?main(String[]?args)?{? ??

???? ??

??????? ??

????????????doUncompressFile("E:\\AUTORUN.INF.gz");? ??

??????? ??

??

????}? ??

??

}???

?

?

http://blog.csdn.net/hwq1987/article/details/6279130

在解壓gz文件時，如果直接用java.util.zip.GZIPInputStream來處理問題只能解壓很少一部分內容，通過類MultiMemberGZIPInputStream 可以完全解壓一個gz文件。

?

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