servlet upload Download

Here is a JSP page, the form has 4 file input text box, you can upload 4 files:
<form action= "File?file=uploadbyjs" method= "post" enctype= "Multipart/form-data" >
<input type= "File" Name=file1 "size=" ><Br>
<input type= "File" Name=file2 "size=" ><Br>
<input type= "File" Name=file3 "size=" ><Br>
<input type= "File" Name=file4 "size=" ><Br>
<input type= "Submit" value= "Upload" >
</form>
Of course you can set up to upload more files at the same time ...
Servlet handlers:
1String Path = "D:/work space/jsp workspace/jsp_servlet_upandload/file/upload";
2//Create a new Jsmartupload object
3 Smartupload smartupload = new Smartupload ();
4//Upload initialization
5 smartupload.initialize (This.getservletconfig (), request,response);
6 try {
7//Set upload limit
8//Limit the maximum length of each uploaded file; set Max to 1024*1024*20
9 smartupload.setmaxfilesize (1024*1024*10);
10//Limit the length of total uploaded data
Smartupload.settotalmaxfilesize (1024*1024*20);
12//Limit the types of files allowed to upload, allow doc, txt, bat files
Smartupload.setallowedfileslist ("Doc,txt,bat");
14//Limit file types that are not allowed to upload, disallow EXE, JSP, and files without extensions
Smartupload.setdeniedfileslist ("exe,jsp,,");
16//Upload files
Smartupload.upload ();
18//Save the file to the specified directory
Smartupload.save (path);
catch (SQLException e) {
E.printstacktrace ();
\ catch (Smartuploadexception e) {
E.printstacktrace ();
24}
25
26//Extract the file information, and output the information of the uploaded file
(int i = 0; i < Smartupload.getfiles (). GetCount (); i++) {
Com.jspsmart.upload.File myFile =smartupload.getfiles (). GetFile (i);
29//If file in file Form option does not select file then continue
if (myfile.ismissing ())
Continue;
32//Display information for the current file
Response.setcontenttype ("Text/html;charset=utf-8");
PrintWriter out = Response.getwriter ();
Out.println ("<table border= ' 1 ' >");
Out.println ("<tr><td> form Options </td><td>" +myfile.getfieldname () + "</td></tr>");
PNS out.println ("<tr><td> file length:</td><td>" +myfile.getsize () + "</td></tr>");
OUT.PRINTLN ("<tr><td> filename </td><td>" +myfile.getfilename () + "</td></tr>");
Out.println ("<tr><td> file extension </td><td>" +myfile.getfileext () + "</td></tr>");
Out.println ("<tr><td> file name </td><td>" +myfile.getfilepathname () + "</td></tr> ");
Out.println ("</table><br>");
42}
The program uses the Smartuploa object directly to implement file uploads. After the object is requested, it must be initialized: Smartupload.initialize (This.getservletconfig (), request,response);

Using the Jspsmartupload component for file download can be very simple:
JSP page:

<a href= "${pagecontext.request.contextpath}/file1?file=downbyjsmart&name=user.txt" > Download user</a>
1//Get download file name
2 String fileName = Request.getparameter ("name");
3//Create a new Smartupload object
4 Smartupload smartupload = new Smartupload ();
5//initialization
6 smartupload.initialize (This.getservletconfig (), request, response);
7//Set contentdisposition to NULL to prevent the browser from automatically opening files
8//Guarantee after clicking the link is the download file.
9 smartupload.setcontentdisposition (NULL);
10//Download file
try {
Smartupload.downloadfile ("D:/work space/jsp workspace/jsp_servlet_upandload/file/upload/" +fileName);
(Smartuploadexception e) {
E.printstacktrace ();
15}

Servlet upload Download