Java 读写GZIP格式文件

最新推荐文章于 2021-02-28 07:51:50 发布

转载最新推荐文章于 2021-02-28 07:51:50 发布 · 668 阅读

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本文介绍了一个使用 Java 实现的 GZIP 文件压缩和解压程序。该程序通过 GZIPOutputStream 和 GZIPInputStream 对文件进行压缩与解压处理，并展示了如何在 Java 中读写字节流来完成这一过程。

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import java.io.ByteArrayOutputStream; 

import java.io.File; 

import java.io.FileInputStream; 

import java.io.FileNotFoundException; 

import java.io.FileOutputStream; 

import java.io.IOException; 

import java.io.InputStream; 

import java.util.zip.GZIPInputStream; 

import java.util.zip.GZIPOutputStream; 

public class GZipFileTest
 { 

    private static final int BUFFER_SIZE
 = 1024; 

/**

     *
 @param args

*/

    public static void main(String[]
 args) { 

        File
 inputFile = new File("D:/test/input.txt"); 

        File
 outputFile = new File("D:/test/test.dat"); 

        writeGZip(inputFile,outputFile); 

        readGZip(outputFile); 

}

    public static void readGZip(File
 file) { 

        GZIPInputStream
 gzipInputStream = null; 

        ByteArrayOutputStream
 baos = null; 

        try { 

            gzipInputStream
 = new GZIPInputStream(new FileInputStream(file)); 

            baos
 = new ByteArrayOutputStream(); 

            byte[]
 buf = new byte[BUFFER_SIZE]; 

            int len
 = 0; 

            while((len=gzipInputStream.read(buf, 0,
 BUFFER_SIZE))!=-1){ 

                baos.write(buf, 0,
 len); 

}

            baos.toByteArray(); 

            String
 result = baos.toString("UTF-8"); 

            System.out.println("result="+result); 

        } catch (FileNotFoundException
 e) { 

            e.printStackTrace(); 

        } catch (IOException
 e) { 

            e.printStackTrace(); 

        }finally{ 

            if(gzipInputStream!=null){ 

                try { 

                    gzipInputStream.close(); 

                } catch (IOException
 e) { 

                    e.printStackTrace(); 

}

}

            if(baos!=null){ 

                try { 

                    baos.close(); 

                } catch (IOException
 e) { 

                    e.printStackTrace(); 

}

}

}

}

    public static void writeGZip(File
 inputFile, File outputFile) { 

        GZIPOutputStream
 gzipOutputStream = null; 

        InputStream
 in = null; 

        try { 

            gzipOutputStream
 = new GZIPOutputStream(new FileOutputStream(outputFile)); 

            in
 = new FileInputStream(inputFile); 

            byte[]
 buffer = new byte[BUFFER_SIZE]; 

            int len
 = 0; 

            while ((len
 = in.read(buffer,0,BUFFER_SIZE))
 > 0)
 { 

                gzipOutputStream.write(buffer, 0,
 len); 

}

            gzipOutputStream.finish(); 

        } catch (FileNotFoundException
 e) { 

            e.printStackTrace(); 

        } catch (IOException
 e) { 

            e.printStackTrace(); 

        }finally{ 

            if(gzipOutputStream!=null){ 

                try { 

                    gzipOutputStream.close(); 

                } catch (IOException
 e) { 

                    e.printStackTrace(); 

}

}

            if(in!=null){ 

                try { 

                    in.close(); 

                } catch (IOException
 e) { 

                    e.printStackTrace(); 

}

}

}

}

}