It was just another long day at office with the database not available and one of the team members lagging by a week now. So, we had to work as a team to get it delivered. In Spring 3, it looked straight forward to upload a file. However, there was little help on offer, to upload multiple files from a jsp file.
\n
\n
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\n
\n
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\nThere are three basic things which need to be done to upload multiple files are:<\/p>\n
a) The JSP needs to have the input[file] elements passed as an array.<\/p>\n
<td><input name=\"fileData[0]\" id=\"image0\" type=\"file\" \/><\/td>\r\n<td><input name=\"fileData[1]\" id=\"image1\" type=\"file\" \/><\/td><\/pre>\nb) The ModelAttribute\/Model object in Spring MVC needs to have a list of MultipartFile.<\/p>\n
import java.util.List;\r\nimport org.springframework.web.multipart.commons.CommonsMultipartFile;\r\npublic class UploadItem {\r\n private String filename;\r\n private List<CommonsMultipartFile> fileData;<\/pre>\nc) Configure Multipart Resolver bean in dispatcher-servlet.xml[applicationContext-servlet.xml]<\/p>\n
<!-- Configure the multipart resolver -->\r\n<bean id=\"multipartResolver\" class=\"org.springframework.web.multipart.commons.CommonsMultipartResolver\">\r\n<\/bean><\/pre>\nd) Logic to read the files from the Model and store it in a file location in the Controller layer.<\/p>\n
@RequestMapping(method = RequestMethod.POST)\r\npublic String create(UploadItem uploadItem, BindingResult result,\r\nHttpServletRequest request, HttpServletResponse response,\r\nHttpSession session) {\r\nif (result.hasErrors()) {\r\nfor (ObjectError error : result.getAllErrors()) {\r\nSystem.err.println(\"Error: \" + error.getCode() + \" - \"\r\n+ error.getDefaultMessage());\r\n}\r\nreturn \"\/uploadfile\";\r\n}\r\n\/\/ Some type of file processing...\r\nSystem.err.println(\"-------------------------------------------\");\r\ntry {\r\nfor(MultipartFile file:uploadItem.getFileData()){\r\nString fileName = null;\r\nInputStream inputStream = null;\r\nOutputStream outputStream = null;\r\nif (file.getSize() > 0) {\r\ninputStream = file.getInputStream();\r\nif (file.getSize() > 20000) {\r\nSystem.out.println(\"File Size exceeded:::\" + file.getSize());\r\nreturn \"\/uploadfile\";\r\n}\r\nSystem.out.println(\"size::\" + file.getSize());\r\nfileName = request.getRealPath(\"\") + \"\/images\/\"\r\n+ file.getOriginalFilename();\r\noutputStream = new FileOutputStream(fileName);\r\nSystem.out.println(\"fileName:\" + file.getOriginalFilename());\r\nint readBytes = 0;\r\nbyte[] buffer = new byte[10000];\r\nwhile ((readBytes = inputStream.read(buffer, 0, 10000)) != -1) {\r\noutputStream.write(buffer, 0, readBytes);\r\n}\r\noutputStream.close();\r\ninputStream.close();\r\n\/\/ ..........................................\r\nsession.setAttribute(\"uploadFile\", file.getOriginalFilename());\r\n}\r\n\/\/MultipartFile file = uploadItem.getFileData();\r\n}\r\n} catch (Exception e) {\r\ne.printStackTrace();\r\n}\r\nreturn \"redirect:\/forms\/uploadfileindex\";\r\n}<\/pre>\nI have extended the example which is found @ RoseIndia<\/a>\u00a0to dynamically create the file nodes and post them to the Controller.
<\/div> <\/div><\/p>\nJust download the source-code and replace the below jsp file and make other necessary changes:<\/p>\n
Upload.jsp<\/p>\n
<%@page contentType=\"text\/html;charset=UTF-8\"%>\r\n<%@page pageEncoding=\"UTF-8\"%>\r\n<%@ page session=\"false\"%>\r\n<%@ taglib prefix=\"form\" uri=\"http:\/\/www.springframework.org\/tags\/form\"%>\r\n\r\n<html>\r\n<head>\r\n<META http-equiv=\"Content-Type\" content=\"text\/html;charset=UTF-8\">\r\n<title>Upload Example<\/title>\r\n<script language=\"JavaScript\">\r\nvar count=0;\r\nfunction add(type) {\r\n\/\/Create an input type dynamically.\r\nvar table = document.getElementById(\"fileUploadTable\");\r\nvar tr = document.createElement(\"tr\");\r\nvar td = document.createElement(\"td\");\r\nvar element = document.createElement(\"input\");\r\n\r\n\/\/Assign different attributes to the element.\r\nelement.setAttribute(\"type\", \"file\");\r\nelement.setAttribute(\"value\", \"\");\r\nelement.setAttribute(\"name\", \"fileData[\"+type+\"]\");\r\n\/\/Append the element in page (in span).\r\ntd.appendChild(element);\r\ntr.appendChild(td);\r\ntable.appendChild(tr);\r\n}\r\nfunction Validate()\r\n{\r\nvar image =document.getElementById(\"image\").value;\r\nif(image!=''){\r\nvar checkimg = image.toLowerCase();\r\nif (!checkimg.match(\/(\\.jpg|\\.png|\\.JPG|\\.PNG|\\.jpeg|\\.JPEG)$\/)){\r\nalert(\"Please enter Image File Extensions .jpg,.png,.jpeg\");\r\ndocument.getElementById(\"image\").focus();\r\nreturn false;\r\n}\r\n}\r\nreturn true;\r\n}\r\n\r\n<\/script>\r\n<\/head>\r\n<body>\r\n<form:form modelAttribute=\"uploadItem\" name=\"frm\" method=\"post\"\r\nenctype=\"multipart\/form-data\" onSubmit=\"return Validate();\">\r\n<fieldset><legend>Upload File<\/legend>\r\n<table >\r\n<tr>\r\n<input type=\"button\" name=\"Add Image\" onclick=\"add(count++)\" value=\"Add Image\"\/>\r\n<\/tr>\r\n<tr>\r\n<table id=\"fileUploadTable\">\r\n<!--td><form:label for=\"fileData\" path=\"fileData\">File<\/form:label><br \/>\r\n<\/td>\r\n<td><input name=\"fileData[0]\" id=\"image0\" type=\"file\" \/><\/td>\r\n<td><input name=\"fileData[1]\" id=\"image1\" type=\"file\" \/><\/td-->\r\n<\/table>\r\n<\/tr>\r\n<tr>\r\n<td><br \/>\r\n<\/td>\r\n<td><input type=\"submit\" value=\"Upload\" \/><\/td>\r\n<\/tr>\r\n<\/table>\r\n<\/fieldset>\r\n<\/form:form>\r\n<\/body>\r\n<\/html><\/pre>\nUploadItem.java, generate getter and setter methods for the private List fileData;, UploadFileController.java and then just copy and paste the create(\u2026) mentioned in the blog above.<\/p>\n
Note: If you are still facing issue with file upload in Spring MVC, please add a MultipartFilter. Refer here<\/a>.<\/p>\n
<filter>\r\n<filter-name>multipartFilter<\/filter-name>\r\n<filter-class>org.springframework.web.multipart.support.MultipartFilter<\/filter-class>\r\n<\/filter>\r\n<filter-mapping>\r\n<filter-name>multipartFilter<\/filter-name>\r\n<url-pattern>\/springrest\/*<\/url-pattern>\r\n<\/filter-mapping><\/pre>\n<bean id=\"filterMultipartResolver\" class=\"org.springframework.web.multipart.commons.CommonsMultipartResolver\">\r\n<property name=\"maxUploadSize\">\r\n<value>10000000<\/value>\r\n<\/property>\r\n<\/bean><\/pre>\n<\/p>\n
Reference: <\/em><\/strong>Upload multiple files in Spring MVC 3<\/a> from our JCG partner<\/a> Srinivas Ovn at the Bemused<\/a> blog.<\/p>\n","protected":false},"excerpt":{"rendered":"
It was just another long day at office with the database not available and one of the team members lagging by a week now. So, we had to work as a team to get it delivered. In Spring 3, it looked straight forward to upload a file. However, there was little help on offer, to …<\/p>\n","protected":false},"author":347,"featured_media":240,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[30,150],"class_list":["post-7539","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-enterprise-java","tag-spring","tag-spring-mvc"],"yoast_head":"\n
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