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javafilehttptypesmime-types

Setting content type in Java for file download

In my application I like to provide file download facility. I set the file types to response.setContentType. How can I set the content types for almost all known file types? Is there any easy way? or I need to set it manually like i do now, which is given below.

if (pictureName.indexOf("jpg") > 0) {
   res.setContentType("image/jpg");
} else if (pictureName.indexOf("gif") > 0) {
   res.setContentType("image/gif");
} else if (pictureName.indexOf("pdf") > 0) {
   res.setContentType("application/pdf");
   res.setHeader("Content-Disposition", "inline; filename=\"" + pictureName + "\"");
} else if (pictureName.indexOf("html") > 0) {
   res.setContentType("text/html");
} else if (pictureName.indexOf("zip") > 0) {
   res.setContentType("application/zip");
   res.setHeader("Content-Disposition", "attachment; filename=\"" + pictureName + "\"");
}
Solution

  • Take a look at javax.activation.MimetypesFileTypeMap (comes as part of Java6, can be downloaded for prior version). It has a method that returns the mime type for a given filename.

    I've never tried using it myself, though, and it's possible you'll still need to supply it with a list of mime types. Worth a look, though.