java - How to restrict a file if file extension is changed and try to upload using Plupload -


i using puploader upload file in java project. restricting of filetypes .exe uploading. when extension changed gets uploaded. example, when user changed extension of test.exe file test.txt , tried upload, uploaded in project. cause serious issue in project file downloadable other users. need restrict files checking previous extensions or if possible checking file content. there way that?


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