SPRINGMVC supports file uploads through the Multipartresolver (multipart parser) object.
Multipartresolver is an interface object that needs to be implemented by its implementation class Commonsmultipartresolver to perform file upload work.
1. Use the Multipartresolver object to configure the Bean in XML.
1<?xml version= "1.0" encoding= "UTF-8"?>2<beans xmlns= "Http://www.springframework.org/schema/beans"3Xmlns:xsi= "Http://www.w3.org/2001/XMLSchema-instance"4xmlns:context= "Http://www.springframework.org/schema/context"5Xsi:schemalocation= "Http://www.springframework.org/schema/beans6http//www.springframework.org/schema/beans/spring-beans-4.3.xsd7http//Www.springframework.org/schema/context8http//www.springframework.org/schema/context/spring-context-4.3.xsd ">9<context:annotation-config/>Ten<context:component-scan base- Package= "Com.wxy.controller"/> One<bean id= "Viewresolver"class= "Org.springframework.web.servlet.view.InternalResourceViewResolver" > A<property name= "prefix" value= "/web-inf/jsp/" ></property> -<property name= "suffix" value= ". JSP" ></property> -</bean> the <bean id= "multipartresolver" class= " Org.springframework.web.multipart.commons.CommonsMultipartResolver">16 <property name=" Defaultencoding "value=" UTF-8 "/>17 <property name=" maxuploadsize "value=" 2097152 "/>18 </bean> +</beans>
2.fileupload.jsp upload Page
1<%@ page contenttype= "Text/html;charset=utf-8" language= "java"%>234<title> File Upload </title>5<script>6<%--decide whether to fill in the descendants and have chosen to upload files--%>7 function Check () {8var name = document.getElementById ("name"). Value ();9var name = document.getElementById ("File"). Value ();Ten if(name== ""){ OneAlert ("Please fill in the Descendants"); A return false; - } - if(file.length==0| | file== ""){ theAlert ("Please select Upload file"); - return false; - } - return true; + } -</script> + A<body> at<%--enctype= "Multipart/form-data" uses a binary stream to process form data--%> - <form action= "${pagecontext.request.contextpath}/fileupload.action" method= "post" enctype= "multipart/ Form-data "onsubmit=" return Check () ">25 uploader: <input id=" name "type=" text "name=" name "/><br/>26 Please select File : <input id= "file" type= "file" Name= "UploadFile" multiple= "multiple"/><br/>27 <%-- Multiple properties Select multiple file uploads--%>28 <input type= "Submit" value= "File Upload"/>29 </form> -</body> to3.filedownload.jsp download page
1 <%@ page contenttype= "Text/html;charset=utf-8" language= "Java" pageencoding= "UTF-8"%> 2 <%@ page import = "Java.net.URLEncoder"%> 3 4 5 <meta http-equiv= " Content-type "content=" text/html; Charset=utf-8 "> 6 <title> file Download </title> 7 8 <body> 9 <a href= "${pagecontext.request.contextpath}/ Download.action?filename=<%=urlencoder.encode ("image. txt", "UTF-8")%> "> File download </a> 10 </body>11 4.fileuploadanddownloadcontroller.java file Upload and download controller class
1 PackageCom.wxy.controller;2 3 Importorg.apache.commons.io.FileUtils;4 Importorg.springframework.http.HttpHeaders;5 ImportOrg.springframework.http.HttpStatus;6 ImportOrg.springframework.http.MediaType;7 Importorg.springframework.http.ResponseEntity;8 ImportOrg.springframework.stereotype.Controller;9 Importorg.springframework.web.bind.annotation.RequestMapping;Ten ImportOrg.springframework.web.bind.annotation.RequestParam; One ImportOrg.springframework.web.multipart.MultipartFile; A - Importjavax.servlet.http.HttpServletRequest; - ImportJava.io.File; the ImportJava.net.URLEncoder; - Importjava.util.List; - ImportJava.util.UUID; - +@Controller ("Controller") - Public classFileuploadanddownloadcontroller { +@RequestMapping ("/tofileupload") A PublicString toupload () { at return"FileUpload"; - } -@RequestMapping ("/tofiledownload") - PublicString todownload () { - return"Download"; - } in@RequestMapping ("/fileupload.action") - PublicString Handleformupload (@RequestParam ("name") String name, to@RequestParam ("UploadFile") list<multipartfile>UploadFile, httpservletrequest request) { + if(!uploadfile.isempty () && uploadfile.size () > 0) { - for(Multipartfile file:uploadfile) { theString OriginalFilename =file.getoriginalfilename (); *String Dirpath = Request.getservletcontext (). Getrealpath ("/upload/"); $File FilePath =NewFile (dirpath);Panax Notoginseng if(!filepath.exists ()) { - filepath.mkdirs (); the } + AString NewFileName = name + "_" +OriginalFilename; the Try { +File.transferto (NewFile (Dirpath + "_" +newfilename)); -}Catch(Exception e) { $ e.printstacktrace (); $ return"Error"; - } - } the return"Success"; -}Else {Wuyi return"Error"; the } - } Wu@RequestMapping ("/download.action") - Publicresponseentity<byte[]> filedownload (httpservletrequest request,string filename)throwsexception{ AboutString path = Request.getservletcontext (). Getrealpath ("/upload"); $File File =NewFile (path+file.separator+filename); -filename = This. GetFileName (request,filename); -Httpheaders headers =Newhttpheaders (); -Headers.setcontentdispositionformdata ("Attachment", filename); A Headers.setcontenttype (mediatype.application_octet_stream); + return Newresponseentity<byte[]>(Fileutils.readfiletobytearray (file), headers, httpstatus.ok); the } - PublicString getfilename (httpservletrequest request,string filename)throwsexception{ $String[] Iebrowserkeyword = {"MSIE", "Trident", "Edge"}; theString useragent = Request.getheader ("User-agent"); the for(String keyword:iebrowserkeyword) { the if(Useragent.contains (KeyWord)) { the returnUrlencoder.encode (filename, "UTF-8"); - } in } the return NewString (Filename.getbytes ("UTF-8"), "Iso-8859-1"); the } About}FileuploadanddownloadcontrollerSpringmvc file upload and download implementation
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