Implement the page upload image Function

Page code:

<Input type = "file" name = "picture"/> upload an image <br/>

The key is to add an attribute when submitting a form.

<Forpolichod = "Post" id = "form" Action = "register! Inland_p.action "enctype =" multipart/form-Data ">

When obtaining antion:

Define three variables

PrivateFile
Picture;

PrivateString
Picturecontenttype;

PrivateString
Picturefilename;

Add the Set Method

Struts2 automatically uploads the image file to the action

Save to the specified path:

// Save the image

PrivatevoidSavaimage (File picture, string path, stringpicturefilename ){

 

Fileinputstream in =
Null;

Fileoutputstream out =
Null;

Bufferedinputstream bufferedin =
Null;

Bufferedoutputstream bufferedout =
Null;

Try{

//
Save image to local

In =NewFileinputstream (picture );

Out =NewFileoutputstream (path + picturefilename );

Bufferedin =
NewBufferedinputstream (in );

Bufferedout =
NewBufferedoutputstream (out );

Byte[] DATA =
Newbyte[1];

While(Bufferedin. Read (data )! =-1 ){

Bufferedout. Write (data );

}

//
Write all data in the buffer

Bufferedout. Flush ();

//
Close stream

In. Close ();

Out. Close ();

Bufferedin. Close ();

Bufferedout. Close ();

}Catch(Exception e ){

E. printstacktrace ();

}Finally{

Try{

//
Close stream

If(In! =
Null){

In. Close ();

}

If(Out! =
Null){

Out. Close ();

}

If(Bufferedin! =
Null){

Bufferedin. Close ();

}

If(Bufferedout! =
Null){

Bufferedout. Close ();

}

}Catch(Ioexception e ){

E. printstacktrace ();

}

}

}

 

Image verification methods: (the code can be found on the Internet)

1. Determine the file type

2. Determine the first few characters of the file

3. determine the length and width of the file to determine whether it is an image (recommended)

4. processing of malicious images is not done for the moment. Only anti-virus software on the server can be expected.