Name: boT120536 Date: 05/13/2001


java version "1.3.0"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.
Java HotSpot(TM) Client VM (build 1.3.0-C, mixed mode)

java.util.zip.ZipInputStream and ZipOutputStream throws an IOException:"stream
closed" if you call the close() method on an already closed stream.
java.util.zip.GZIPInputStream and GZIPOutputStream doesn't behave this way, nor
does any other stream classes in java.io.* to my knowledge.


import java.io.*;
import java.util.zip.*;

public class TestClosingZipStreams
{
    public static void main(String[] args)
    {
        try
        {
            FileOutputStream gzFile = new FileOutputStream("tmp.gz");
            FileOutputStream zipFile = new FileOutputStream("tmp.zip");
            GZIPOutputStream gzStream = new GZIPOutputStream(gzFile);
            ZipOutputStream zipStream = new ZipOutputStream(zipFile);

            gzStream.write(0);

            System.out.print("Trying to close the open GZIPOutputStream...");
            gzStream.close();
            System.out.println("OK");

            System.out.print("Trying to close the already closed
GZIPOutputStream...");
            gzStream.close();
            System.out.println("OK");

            zipStream.putNextEntry(new ZipEntry("X"));
            zipStream.write(0);
            zipStream.closeEntry();

            System.out.print("Trying to close the open ZipOutputStream...");
            zipStream.close();
            System.out.println("OK");

            System.out.print("Trying to close the already closed
ZipOutputStream...");
            zipStream.close();
            System.out.println("OK");

        }
        catch(IOException e)
        {
            //System.out.println(e);
            e.printStackTrace();
        }
    }
}

=======================================
Output:
=======================================
Trying to close the open GZIPOutputStream...OK
Trying to close the already closed GZIPOutputStream...OK
Trying to close the open ZipOutputStream...OK
Trying to close the already closed ZipOutputStream...java.io.IOException: Stream
 closed
        at java.util.zip.ZipOutputStream.ensureOpen(ZipOutputStream.java:46)
        at java.util.zip.ZipOutputStream.finish(ZipOutputStream.java:286)
        at java.util.zip.ZipOutputStream.close(ZipOutputStream.java:312)
        at TestClosingZipStreams.main(TestClosingZipStreams.java:35)
(Review ID: 123138)
======================================================================