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Return ZipOutputStream using Servlet

Posted on 2016-08-28
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Last Modified: 2016-09-04
In my Servlet, I am creating a zip file using ZipoutputStream

public ZipOutputStream zipIt(String zipFile) {
	   byte[] buffer = new byte[1024];
	   String source = "";
	   FileOutputStream fos = null;
	   ZipOutputStream zos = null;
	   try {
	      try {
	         source = SOURCE_FOLDER.substring(SOURCE_FOLDER.lastIndexOf("\\") + 1, SOURCE_FOLDER.length());
	      }
	     catch (Exception e) {
	        source = SOURCE_FOLDER;
	        e.printStackTrace();
	     }
	     fos = new FileOutputStream(zipFile);
	     zos = new ZipOutputStream(fos);

	     System.out.println("Output to Zip : " + zipFile);
	     FileInputStream in = null;

	     for (String file : this.fileList) {
	        System.out.println("File Added : " + file);
	        ZipEntry ze = new ZipEntry(source + File.separator + file);
	        zos.putNextEntry(ze);
	        try {
	           in = new FileInputStream(SOURCE_FOLDER + File.separator + file);
	           int len;
	           while ((len = in.read(buffer)) > 0) {
	              zos.write(buffer, 0, len);
	           }
	        }
	        finally {
	           in.close();
	        }
	     }
	     zos.closeEntry();
	     System.out.println("Folder successfully compressed");
	  }

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Once the zip is created, I would like to send it back to the client. However, to send it as a part of the response object, it needs to be a byte[]. How can I convert ZipOutputStream to byte[]?
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Question by:ank5
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Accepted Solution

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CEHJ earned 500 total points
ID: 41774391
However, to send it as a part of the response object, it needs to be a byte[].
Hmm. I don't quite understand that. It actually needs to be written to the servlet's OutputStream, so just write it to that instead of to 'fos'

Your buffer is almost certainly too small btw
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by:CEHJ
ID: 41783800
:)
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