CODEWITHSUNDEEP
javajspfile-uploadstruts2
user1191027
user1191027

Reputation:

Get Image upload file type in Java

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

Upvotes: 1

Views: 1386

Answers (3)

Naytzyrhc
Naytzyrhc

Reputation: 2317

apart from Truong Ha's answer (MimetypesFileTypeMap needs activation.jar), there are some more other ways as well:

http://www.rgagnon.com/javadetails/java-0487.html

cheers,

Upvotes: 1

Truong Ha
Truong Ha

Reputation: 10954

Try to touch the mime type of it

File f = new File("temp.tmp");
System.out.println("Mime Type of " + f.getName() + " is " + new MimetypesFileTypeMap().getContentType(f));

the output should be something like: image/gif or image/png or image/jpg etc.

Upvotes: 1

Jigar Joshi
Jigar Joshi

Reputation: 240966

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

Upvotes: 0

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