File Upload, download

File download is relatively simple, response set header tells the browser this is a file download and then Getoutputstream write to the designated place to go.

Such as:

Resp.setheader ("Content-disposition", "Attachment;filename=" +new String ("Test". GetBytes ("GBK"), "iso8859-1") + ". jpg" );

InputStream in = This.getclass (). getClassLoader (). getResourceAsStream ("1.jpg");

OutputStream out = Resp.getoutputstream ();

byte[] bytes = new byte[8192];
int len = 0;
while ((Len=in.read (bytes))!=-1) {
Out.write (bytes, 0, Len);
}
Out.flush ();
In.close ();
Out.close ();

File upload no trouble adding a file form field to a JSP the Enctype= "Multipart/form-data" method must be a post

Need to import two packages under apache.org in Commons Commons-fileupload-1.3.2.jar Commons-io-2.5.jar

Determine if the request is a file upload

Create a temporary warehouse for the parser to give the parser to the file upload object if it is created

Parsing requests

Determine if the normal form field is normal if it is not file upload processing

See File Upload code for details

File Upload, download