Zip compression of file uploads prior to emailing them

[robdavidsalmon]

Is there a way in Ebase of compressing files (in a zip compatible way) that have been uploaded via the uploadFileFromBrowser() method prior to emailing the resultant zip file as an attachment? I am aware that Java has its java.util.zip package but didn't want to explore that route if there was already some default functionality for doing the same thing built into Ebase.[/url]

[Jon]

There isn't anything built into Ebase. I would advise using java.util.zip - you can include all the code in a Javascript script so don't need to create any Java classes. If you get stuck we could probably cobble together an example.

[Steve James]

Thanks both, I'd had a vague conversation with a colleague about creating a routine that attaches a number of files and emails them. We hadn't got to the point of developing it but this gave me a focus.

For info and Jon to comment whether this all makes sense (it works).

Code: Select all

importPackage(com.ebasetech.xi.api);
importPackage(com.ebasetech.xi.services);
importPackage(java.io);
importPackage(java.util.zip);
 
var zipFile = "D:/archive.zip";
var srcFiles = [];
srcFiles.push("D:/srcfiles1.txt");
srcFiles.push("D:/srcfiles2.txt");
srcFiles.push("D:/srcfiles3.txt");

try 
{
    // create byte buffer
    var buffer = java.lang.reflect.Array.newInstance(java.lang.Byte.TYPE, 1024);
    var fos = new FileOutputStream(zipFile);
    var zos = new ZipOutputStream(fos);
    for &#40;i=0; i <srcFiles> 0&#41;
      &#123;
      	zos.write&#40;buffer, 0, length&#41;;
      &#125;
      zos.closeEntry&#40;&#41;;
      // close the InputStream
      fis.close&#40;&#41;;
    &#125;
    // close the ZipOutputStream
    zos.close&#40;&#41;;
    log&#40;"done"&#41;;
    event.owner.addErrorMessage&#40;'zip file created.'&#41;;
&#125;
catch &#40;e&#41;
&#123;
	log&#40;"Error creating zip file&#58; " + e&#41;;
	event.owner.addErrorMessage&#40;"Error creating zip file&#58; " + e&#41;;
&#125; 

The principle was lifted from http://examples.javacodegeeks.com/core- ... putstream/


Thanks

[Jon]

How about something like this (also taken from the same example);

Code: Select all

importPackage(com.ebasetech.xi.api);
importPackage(com.ebasetech.xi.services);
importPackage(java.io);
importPackage(java.util.zip); 

var zipFile = "C:/temp/ziptest1.zip";
var srcFiles = [ "C:/temp/file1", "C:/temp/file2", "C:/temp/file3" ];
zipit(srcFiles, zipFile);
event.owner.addWarningMessage("zipped");

function zipit (filenames, targetPath)
{
		try 
		{
			var buffer = java.lang.reflect.Array.newInstance(java.lang.Byte.TYPE, 1024) 
			var fos = new FileOutputStream(zipFile);
			var zos = new ZipOutputStream(fos);
			for each (var filename in filenames) 
			{
				var srcfile = new File(filename);
				var fis = new FileInputStream(srcfile);
				zos.putNextEntry(new ZipEntry(srcfile.getName()));
				while (true)
				{
					var length = fis.read(buffer); 
					if &#40;length <= 0&#41;
						break;
					zos.write&#40;buffer, 0, length&#41;;
				&#125;
				zos.closeEntry&#40;&#41;;
				fis.close&#40;&#41;;
			&#125;
		&#125;
		catch &#40;e&#41; 
		&#123;
			 event.owner.addErrorMessage&#40;"Error creating zip file&#58; " + e, false&#41;; 
		&#125;
		finally
		&#123;
			if &#40;zos&#41;
				zos.close&#40;&#41;;
		&#125;
&#125;

[Steve James]

Thanks Jon, I really must get into the habit of using a "finally"

That said the addErrorMessage would prevent the finally from running.

[Jon]

It shouldn't. The finally clause should always run - in any circumstance.

[Steve James]

Hi Jon, it does stop the finally from running.

Thanks

[Jon]

So it does, that's something to watch out for. I've changed the code in the example above.