The basic SPRINGMVC has been written in my last article, which explains how to use Springmvc to upload files on a form and upload multiple files at the same time.
File Upload Project source code download address: Demo
First, the configuration file:
Springmvc used Multipartfile to upload files, so we're going to first configure the Multipartresolver: To work with the file in the form
<!--Configure Multipartresolver for file uploads using spring's commosmultipartresolver-->
<beans:bean id= "Multipartresolver "Class=" Org.springframework.web.multipart.commons.CommonsMultipartResolver "
p:defaultencoding=" UTF-8
" P:maxuploadsize= "5400000"
p:uploadtempdir= "Fileupload/temp"
>
Where the attributes are detailed:
Two, create a simple upload form:
<body>
Note To add enctype= "Multipart/form-data" to the form label to indicate that it is the most basic thing to do with a file, many people forget to look for bugs in the program after uploading an error but forget it
Third, write upload control class
1. Create a control class: Fileuploadcontroller and a page that returns results list.jsp
2. Write the action of submitting the form:
Get the request @Autowired the spring default configuration through spring's autowired annotations private httpservletrequest request; /*** * Upload files use @requestparam annotations to specify that the file on the form is multipartfile * * @param file * @return */@RequestMapping ( "FileUpload") public String FileUpload (@RequestParam ("file") Multipartfile file) {//To determine if the file is an empty if (!file.isem Pty ()) {try {//File save path String FilePath = Request.getsession (). Getservletcontext (). Getrealpath ("
/") +" upload/"+ file.getoriginalfilename ();
Dump file File.transferto (new file (FilePath));
catch (Exception e) {e.printstacktrace ();
}//redirect return "redirect:/list.html";
/*** * Read all files in the uploaded file and return * * @return/@RequestMapping ("list") public Modelandview list () {
String FilePath = Request.getsession (). Getservletcontext (). Getrealpath ("/") + "upload/";
Modelandview Mav = new Modelandview ("list"); File Uploaddest = new File (FilePath);
string[] FileNames = Uploaddest.list ();
for (int i = 0; i < filenames.length i++) {//print out filename System.out.println (filenames[i]);
return MAV;
}
3. Use SPRINGMVC annotation Requestparam to specify the file parameters in the form;
4, specify a Web project path to save the file
5, through the Multipartfile transferto (file dest) This method to dump the file to the specified path.
This is the end of the basic file upload.
Some methods commonly used in the Multipartfile class are:
Four, multiple file upload.
Multi-File upload is actually very simple, and upload other same parameters like a checkbox, the form uses the same name, and then the Multipartfile parameter class is defined as an array in the action.
Next implementation:
1. Create a form to upload multiple files:
<body>
2, write processing form action, the original method of saving the file to write a separate method to facilitate common use:
/*** *
Save files *
@param file
* @return
/
Private Boolean savefile (Multipartfile file) {
// Determine if the file is an empty
if (!file.isempty ()) {
try {
//File save path
String FilePath = Request.getsession (). Getservletcontext (). Getrealpath ("/") + "upload/"
+ file.getoriginalfilename ();
Dump file
File.transferto (new file (FilePath));
return true;
} catch (Exception e) {
e.printstacktrace ();
}
}
return false;
}
3. Write Action:
@RequestMapping ("Filesupload") public
String filesupload (@RequestParam ("Files") multipartfile[] Files {
// To determine that the file array cannot be empty and that the length is greater than 0
if (files!=null&&files.length>0) {
///loop Gets the file in the files array for
(int i = 0;i< files.length;i++) {
multipartfile file = files[i];
Save files
savefile (file);
}
REDIRECT Return
"redirect:/list.html";
}
Last Run project upload file:
The above is the entire content of this article, I hope to help you learn, but also hope that we support the cloud habitat community.
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