Posts Tagged ‘Spring’

How to use Apache POI HSSF – some hints

Friday, April 18th, 2008 at 16:12 by protokollfuehrer

Apache POI is a java library which allows to build Office-Documents. POI stands for “Poor obsfuscation interface” and is a good description. Nonetheless it’s the only lib I know which allows you to produce what most customers still don’t want to miss: MS Excel sheets and Docs. In the following post, I want to list some hints I found in the last weeks when working on excel sheets:

– Cellstyles don’t work like normal objects: if you use a cellstyle for a cell and AFTERWARDS changes the style to use it for some other cell, you will find only the latter style in the resulting document

– Don’t mix up font definition and borders: Use the HSSFRegionUtil.setBorderXXX() for borders. This methods puts a border around the given region preserving the style (font) defined before. Keep in mind, that you have to use the method AFTER you defined the cell with a certain style.

– if you use Springs AbstractExcelView, do not just implement the excel-building code in a subclass of it. Build an abstraction layer between the Spring view and the building code to avoid dependencies to HttpRequest and HttpResponse. Otherwise testing will be painful. I defined an AbstractDocumentBuildView extending the AbstractExcelView that defines an abstract method which passes only the Workbook and the data to the implementing subclasses.

– Make a big list of constants defining the column/row-structure and labels!

– It is not possible to make “autofilters” so far! Just don’t try it.

– To put a dataFormat of your choice in a cell, use  cellStyle.setDataFormat(HSSFDataFormat.getBuiltinFormat(xxx));

– HSSF is short for “Horrible SpreadSheet Format” (not kiddin’!). So just try to take it easy …

Mac Mail: Where is the mailtext?

Friday, January 11th, 2008 at 17:09 by protokollfuehrer

Heute wieder über eine seltsame Sache gestolpert: Ein Kollege konnte Mails mit Attachment, die über javax.mail verschickt wurden, nicht richtig lesen. Der Mailtext war in Mac Mail einfach nicht zu sehen. Über Webmail und andere Mailprogramme gabs keinerlei Probleme. Klar, muss irgendwas mit dem Mimetype zu tun haben. Und so ist es dann auch. Es gibt (zumindest in Spring) vier MIME-Möglichkeiten für Mails:

1. MULTIPART_MODE_NO -> Gar keine Attachments

2. MULTIPART_MODE_MIXED -> klappt im Outlook, sonst eher schlecht

3. MULTIPART_MODE_RELATED -> klappt in fast allem inkl. Mac Mail, aber nicht Lotus Notes

4. MULTIPART_MODE_MIXED_RELATED -> klappt in fast allem inkl. Lotus Notes, aber nicht in Mac Mail

So. Toll. Immerhin hat man die Wahl zwischen verschiedenen Übeln.