返回顶部

收藏

java gzip压缩解压缩代码

更多

java Gzip压缩实现代码 ```java 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);

}

} java Gzip解压缩代码java 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 &amp;&amp;  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 &amp;&amp;  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");

}

} ```

标签:java

收藏

0人收藏

支持

0

反对

0

发表评论