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upload txt files only

 
Greenhorn
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Hi I am writing a code to allow only txt files to upload.I have written a javascript to allow only .txt files to upload.But if the user gets cranky and renames an exe file to .txt file then on upload i have to prevent it as it results in uploading of junk data Can you please let me know is there a way to know the content type of the file being loaded or any other way i can prevent it. i am using commons-file upload jar
 
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Hi,

just giving you an idea , just get the content and check using unicode values that they are normal charecters(a-z A-Z) or numbers (0-9) if some special charecters are there then don't allow them.

Abdul Mohsin
 
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Nothing to do with SCJP here. Send a PM to a moderator when you can think of the right forum for your topic. Then we will move it for you.
 
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