![\"JSP](\"https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2020\/09\/JSP-File-Uploading.jpg\")
<\/a><\/h2>\nFile Uploading in JSP<\/h2>\n
There are two ways to upload a file to the server in JSP:<\/p>\n
a) Using third party Jar File \u2013<\/strong> Apache has given a powerful API to upload files. This approach will require two jar files that will be in WEB-INF\/lib directory of the application. Download these jar files<\/p>\n b) Servlet 3.0 API –<\/strong> Servlet 3.0Specification gives support for uploading files without including any third party APIs.<\/p>\n Let\u2019s understand uploading a file on the server in detail:<\/p>\n Here we use the HTML to create the front end for the uploading of files. Following attributes may be used in the code.<\/p>\n 1. action attribute:<\/strong> This attribute will forward the request to another resource. 2. method attribute:<\/strong> This attribute will define the HTTP method that will be used to send form data. 3. enctype attribute:<\/strong> This attribute, using multipart as the value, will allow users to browse and upload multiple files. For Example:<\/strong><\/p>\n Some points that need to be understood according to the code above are:<\/p>\n What we created is just a frontend for uploading files. Now we will proceed towards writing the backend of this.<\/p>\n Firstly we need to define where the uploaded files will go. One can either set this up in program or it can be programmed in <context-param> of web.xml configuration as following:<\/p>\n Following is the JSP program of uploading the file.<\/p>\n Consider the following points before running the above code:<\/p>\n\n
Creating an Upload Frontend<\/h3>\n
\nSyntax:<\/p>\nform action = \"UploadForm\" \r\n<\/pre>\n
\nSyntax:<\/p>\nmethod = \"post\"\r\n<\/pre>\n
\nSyntax:<\/p>\nenctype = \"multipart\/form-data\r\n<\/pre>\n
<html>\r\n <head>\r\n <title>Uploading Form for file<\/title>\r\n <\/head>\r\n \r\n <body>\r\n <h3>File Upload:<\/h3>\r\n Select a file to upload: <br \/>\r\n <form action = \"UploadForm\" method = \"post\"\r\n enctype = \"multipart\/form-data\">\r\n <input type = \"file\" name = \"file\" size = \"100\" \/>\r\n <br \/>\r\n <input type = \"submit\" value = \"Upload File\" \/>\r\n <\/form>\r\n <\/body>\r\n \r\n<\/html>\r\n<\/pre>\n
\n
Writing the Backend<\/h3>\n
<web-app>\r\n....\r\n<context-param>\r\n <description>Store uploaded file here<\/description>\r\n <param-name>file-upload<\/param-name>\r\n <param-value>\r\n c:\\apache-tomcat-9.0.34\\webapps\\data\\\r\n <\/param-value>\r\n<\/context-param>\r\n....\r\n<\/web-app>\r\n<\/pre>\n
UploadFile.jsp<\/h3>\n
<%@ page import = \"java.io.*,java.util.*, javax.servlet.*\" %>\r\n<%@ page import = \"javax.servlet.http.*\" %>\r\n<%@ page import = \"org.apache.commons.fileupload.*\" %>\r\n<%@ page import = \"org.apache.commons.fileupload.disk.*\" %>\r\n<%@ page import = \"org.apache.commons.fileupload.servlet.*\" %>\r\n<%@ page import = \"org.apache.commons.io.output.*\" %>\r\n \r\n<%\r\n File file ;\r\n int maxFileSize = 5000 * 1024;\r\n int maxMemSize = 5000 * 1024;\r\n ServletContext context = pageContext.getServletContext();\r\n String filePath = context.getInitParameter(\"file-upload\");\r\n \r\n \/\/ Verify the content type\r\n String contentType = request.getContentType();\r\n \r\n if ((contentType.indexOf(\"multipart\/form-data\") >= 0)) {\r\n \tDiskFileItemFactory factory = new DiskFileItemFactory();\r\n \t\/\/ maximum size stored in memory\r\n \tfactory.setSizeThreshold(maxMemSize);\r\n \t\r\n \t\/\/ Location to save data that is larger than maxMemSize.\r\n \tfactory.setRepository(new File(\"c:\\\\temp\"));\r\n \r\n \t\/\/ Create a new file upload handler\r\n \tServletFileUpload upload = new ServletFileUpload(factory);\r\n \t\r\n \t\/\/ maximum file size to be uploaded.\r\n \tupload.setSizeMax( maxFileSize );\r\n \t\r\n \ttry {\r\n \t\/\/ Parse the request to get file items.\r\n \tList fileItems = upload.parseRequest(request);\r\n \r\n \t\/\/ Process the uploaded file items\r\n \tIterator i = fileItems.iterator();\r\n \r\n \tout.println(\"<html>\");\r\n \tout.println(\"<head>\");\r\n \tout.println(\"<title>JSP File upload<\/title>\"); \r\n out.println(\"<\/head>\");\r\n \tout.println(\"<body>\");\r\n \twhile ( i.hasNext () ) {\r\n \tFileItem fi = (FileItem)i.next();\r\n \tif ( !fi.isFormField () ) {\r\n \t\/\/ Get the uploaded file parameters\r\n \tString fieldName = fi.getFieldName();\r\n \tString fileName = fi.getName();\r\n \tboolean isInMemory = fi.isInMemory();\r\n \tlong sizeInBytes = fi.getSize();\r\n \t\r\n \t\/\/ Write the file\r\n \tif( fileName.lastIndexOf(\"\\\\\") >= 0 ) {\r\n \tfile = new File( filePath +\r\n \tfileName.substring( fileName.lastIndexOf(\"\\\\\"))) ;\r\n \t} else {\r\n \tfile = new File( filePath +\r\n \t fileName.substring(fileName.lastIndexOf(\"\\\\\")+1)) ;\r\n \t}\r\n \tfi.write( file ) ;\r\n \tout.println(\"Uploaded Filename: \" + filePath +\r\n \tfileName + \"<br>\");\r\n \t}\r\n \t}\r\n \tout.println(\"<\/body>\");\r\n out.println(\"<\/html>\");\r\n \t} catch(Exception ex) {\r\n \tSystem.out.println(ex);\r\n \t}\r\n } else {\r\n \tout.println(\"<html>\");\r\n \tout.println(\"<head>\");\r\n \tout.println(\"<title>Servlet upload<\/title>\"); \r\n \tout.println(\"<\/head>\");\r\n \tout.println(\"<body>\");\r\nout.println(\"<p>No file uploaded<\/p>\");\r\n \tout.println(\"<\/body>\");\r\n \tout.println(\"<\/html>\");\r\n }\r\n%>\r\n<\/pre>\n