Question

After uploading a file it gets stored as a .tmp file in a temp directory.

How can one get the actual file type of the file that was uploaded? I need to know if it’s a bmp, jpeg, png, etc. from server side.

Note: I’m also using Struts 2 version 2.1.8.1

Answer 1

On JSP if you have

<s:form action="fileUpload" method="post" enctype="multipart/form-data" >

  <s:file name="userFile" label="File" />

  <s:submit />

</s:form>

in your ActionClass you need to add

public void setUserFileContentType(String userImageContentType) {
    this.userImageContentType = userImageContentType;
}
public void setUserFileFileName(String userImageFileName) {
    this.userImageFileName = userImageFileName;
}

and then you would have access to the fileName and contentType of uploaded file