Upload a file instance in Spring MVC, springmvc
SpringMVC (annotation) Notes for file upload:
1. form's enctype = "multipart/form-data", which is required for uploading files
2. applicationContext. xml configuration:
Copy codeThe Code is as follows:
<! -- When uploading files, SpringMVC needs to configure the MultipartResolver Processor -->
<Bean id = "multipartResolver" class = "org. springframework. web. multipart. commons. CommonsMultipartResolver">
<Property name = "defaultEncoding" value = "UTF-8"/>
<! -- The total size of the uploaded file cannot exceed kb. Note that the limit of the maxUploadSize attribute is not for a single file, but for the total capacity of all files -->
<Property name = "maxUploadSize" value = "200000"/>
<! -- Maximum memory size (10240) -->
<Property name = "maxInMemorySize" value = "40960"/>
</Bean>
<! -- SpringMVC throws org. springframework. web. multipart. MaxUploadSizeExceededException when the file upload limit is exceeded. -->
<! -- This exception was thrown by SpringMVC when checking the information of the uploaded file, and has not yet entered the Controller method. -->
<Bean id = "exceptionResolver" class = "org. springframework. web. servlet. handler. SimpleMappingExceptionResolver">
<Property name = "exceptionMappings">
<Props>
<! -- Encounter MaxUploadSizeExceededException exception, automatically jump to/WEB-INF/jsp/error_fileupload.jsp page -->
<Prop key = "org. springframework. web. multipart. MaxUploadSizeExceededException"> error_fileupload </prop>
</Props>
</Property>
</Bean>
Form pages/WEB-INF/jsp/upload. jsp for uploads
Copy codeThe Code is as follows:
<% @ Page language = "java" contentType = "text/html; charset = UTF-8"
PageEncoding = "UTF-8" %>
<% @ Taglib prefix = "c" uri = "http://java.sun.com/jsp/jstl/core" %>
<! DOCTYPE html PUBLIC "-// W3C // dtd html 4.01 Transitional // EN" "http://www.w3.org/TR/html4/loose.dtd">
<Html>
<Head>
<Script type = "text/javascript" src = ".../js/jquery-1.7.1.min.js"> </script>
<Meta http-equiv = "Content-Type" content = "text/html; charset = UTF-8">
<Title> upload an image </title>
</Head>
<Body>
<Form action = "<% = request. getContextPath () %>/upload/filesUpload" method = "POST" enctype = "multipart/form-data">
Yourfile: <input type = "file" name = "myfiles"/> <br/>
Yourfile: <input type = "file" name = "myfiles"/> <br/>
<Input type = "submit" value = "Upload image"/>
</Form>
</Body>
</Html>
When the content of the uploaded file is too large, the prompt page/WEB-INF/jsp/error_fileupload.jsp
Copy codeThe Code is as follows:
<% @ Page language = "java" pageEncoding = "UTF-8" %>
<H1> the file is too large. Please reselect it
Core UploadController class for file uploading
Copy codeThe Code is as follows:
Package com. ljq. web. controller. annotation;
Import java. io. File;
Import javax. servlet. http. HttpServletRequest;
Import org. springframework. stereotype. Controller;
Import org. springframework. web. bind. annotation. RequestMapping;
Import org. springframework. web. bind. annotation. RequestParam;
Import org. springframework. web. multipart. MultipartFile;
/**
* Upload images
*
* @ Author Administrator
*
*/
@ Controller
@ RequestMapping ("/upload ")
Public class UploadController {
@ RequestMapping ("/toUpload ")
Public String toUpload (){
Return "/upload ";
}
/***
* Save the file
*
* @ Param file
* @ Return
*/
Private boolean saveFile (HttpServletRequest request, MultipartFile file ){
// Determine whether the file is empty
If (! File. isEmpty ()){
Try {
// Save the file path (if the Tomcat server is used, the file will be uploaded to the \ % atat_home % \ webapps \ YourWebProject \ upload \ folder)
String filePath = request. getSession (). getServletContext ()
. GetRealPath ("/") + "upload/" + file. getOriginalFilename ();
File saveDir = new File (filePath );
If (! SaveDir. getParentFile (). exists ())
SaveDir. getParentFile (). mkdirs ();
// Transfer an object
File. transferTo (saveDir );
Return true;
} Catch (Exception e ){
E. printStackTrace ();
}
}
Return false;
}
/**
* Upload images
*
* @ Param files
* @ Param request
* @ Return
*/
@ RequestMapping ("/filesUpload ")
Public String filesUpload (@ RequestParam ("myfiles") MultipartFile [] files,
HttpServletRequest request ){
If (files! = Null & files. length> 0 ){
For (int I = 0; I <files. length; I ++ ){
MultipartFile file = files [I];
// Save the file
SaveFile (request, file );
}
}
// Redirect
Return "redirect:/upload/toUpload ";
}
}
The upload and development of this file is complete.
Common MultipartFile methods:
String getContentType () // obtain the object MIME type
InputStream getInputStream () // returns the file stream
String getName () // get the name of the file component in the form
String getOriginalFilename () // obtain the original name of the uploaded file
Long getSize () // obtains the object's byte size. The unit is byte.
Boolean isEmpty () // whether it is null
Void transferTo (File dest) // save it to a target File
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