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steinchen84 asked on

JSP to CSV generates blank lines

I am generating a csv-file through a JSP, but the csv has a lot of blank lines at the beginning of the file. If opened with MS-Excel, it starts writing in line 12. I would like it to start writing in line 1 though. What do I need to modify? Have tried different things, like comment out.flush() or changing response.setHeader information.
Does anybody know what causes the blanks?
response.setHeader("Content-Disposition","attachement; filename=list.csv");
out.println("ID; TITLE");

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8/22/2022 - Mon

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Wow -- great answer, and great link to raibledesigns.

We can't use the Tomcat trimSpaces parameter because we have plenty of places where we want JSP values printed with a space between them (like user names, e.g.).  But for people just starting a site, they could always make sure that they put the   character in where they want spaces.

We decided to switch to servlets for the CSV files, just to avoid the blank lines at the top of the CSV page.

Thank you for multiple solutions and explanations!
Removing the linebreaks after the directives worked for me.
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