Comments: Multi-File Upload may be complicated in the past, but since the emergence of html5, it has become very easy. Below is a good example, you can refer to the multiple attribute of <input>.
The Code is as follows:
<Input type = "file" name = "multipleFileUpload" multiple/>
The detailed code of the page is as follows:
The Code is as follows:
<! DOCTYPE html>
<Html>
<Head>
<Meta http-equiv = "Content-Type" content = "text/html; charset = gb2312"/>
<Title> Solution 4-5: Sending multiple files </title>
</Head>
<Body>
<Form id = "myForm"
Action = "http: // 10.10.25.31: 8080/myupload/UploadPhotoServlet" ENCTYPE = "multipart/form-data" METHOD = "POST">
<Input type = "file" name = "multipleFileUpload" multiple/> <input
Type = "submit" value = "submit"> <input type = "reset" value = "reset">
</Form>
</Body>
</Html>
Detailed code of the java Background:
The Code is as follows:
Import java. io. File;
Import java. io. IOException;
Import java. text. SimpleDateFormat;
Import java. util. Calendar;
Import java. util. Date;
Import java. util. List;
Import javax. servlet. ServletException;
Import javax. servlet. http. HttpServlet;
Import javax. servlet. http. HttpServletRequest;
Import javax. servlet. http. HttpServletResponse;
Import org. apache. commons. fileupload. FileItem;
Import org. apache. commons. fileupload. FileUploadException;
Import org. apache. commons. fileupload. disk. DiskFileItemFactory;
Import org. apache. commons. fileupload. servlet. ServletFileUpload;
/**
* Servlet implementation class UploadPhotoServlet
*/
Public class UploadPhotoServlet extends HttpServlet {
Private static final long serialVersionUID = 1L;
/**
* @ See HttpServlet # HttpServlet ()
*/
Public UploadPhotoServlet (){
Super ();
// TODO Auto-generated constructor stub
}
/**
* @ See HttpServlet # doGet (HttpServletRequest request, HttpServletResponse response)
*/
Protected void doGet (HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
DoPost (request, response );
}
/**
* @ See HttpServlet # doPost (HttpServletRequest request, HttpServletResponse response)
*/
@ SuppressWarnings ("unchecked ")
Protected void doPost (HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String imagePath = "c: \ uploadFile \ Image \" + getEachDate () + "\"; // generate a folder by date
File uploadPath = new File (imagePath );
If (! UploadPath. exists ()){
UploadPath. mkdirs ();
}
File tmp = new File ("c: \ tmp \\");
If (! Tmp. exists ()){
Tmp. mkdirs ();
}
DiskFileItemFactory factory = new DiskFileItemFactory (); // create a disk factory
Factory. setRepository (tmp); // sets the File Cache path.
Factory. setSizeThreshold (10*1096); // The default critical value for saving files in the memory or on-disk Temporary Folder. The value is 10240, that is, 10 KB.
ServletFileUpload sfu = new ServletFileUpload (factory); // create a processing tool
Sfu. setSizeMax (10*1024*1024); // The maximum file size that the server can receive.-1 indicates no upper limit.
String fileName = null;
Try {
List <FileItem> list = sfu. parseRequest (request); // parse
If (list. size () <1 ){
Return;
}
For (int j = 0; j <list. size (); j ++ ){
FileItem item = list. get (j );
FileName = item. getName ();
If (fileName. equals ("")){
Request. getRequestDispatcher ("/com/visualizerPhoto. jsp"). forward (request, response );
Return;
}
Int pos = fileName. lastIndexOf ("."); // retrieves the image file format
If (pos> 0 ){
Date date = new Date ();
FileName = imagePath + date. getTime () + fileName. substring (pos );
}
System. out. println ("item:" + item );
Item. write (new File (fileName); // write to disk
}
} Catch (FileUploadException e ){
E. printStackTrace ();
} Catch (Exception e ){
E. printStackTrace ();
}
}
// 13-11-15
Public static String getEachDate (){
Calendar cal = Calendar. getInstance ();
Cal. add (Calendar. DATE, 0 );
String yesterday = new SimpleDateFormat ("yyyy-MM-dd"). format (cal
. GetTime ());
String [] dates = yesterday. split ("-");
String realDate = dates [0]. substring (2, 4) + "-" + dates [1] + "-"
+ Dates [2];
Return realDate. trim ();
}
}
Below is:
Start building with 50+ products and up to 12 months usage for Elastic Compute Service
1 on 1 presale consultation
24/7 Technical Support 6 Free Tickets per Quarter Faster Response
Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.
A comprehensive suite of global cloud computing services to power your business
Payment Methods We Support
