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JSP - File Uploading

In this affiliate, we volition talk over File Uploading in JSP. A JSP tin be used with an HTML class tag to let users to upload files to the server. An uploaded file can be a text file or a binary or an image file or only whatever document.

Creating a File Upload Form

Let us now understand how to create a file upload grade. The following HTML code creates an uploader form. Following are the important points to be noted down −

The form method attribute should be ready to Post method and GET method tin can not be used.
The class enctype attribute should be ready to multipart/form-data.
The form activity attribute should be set to a JSP file which would handle file uploading at backend server. Following example is using uploadFile.jsp program file to upload file.
To upload a single file you should employ a single <input .../> tag with attribute type = "file". To allow multiple files uploading, include more 1 input tag with dissimilar values for the name aspect. The browser assembly a Browse button with each of them.

<html>    <head>       <championship>File Uploading Class</title>    </head>        <torso>       <h3>File Upload:</h3>       Select a file to upload: <br />       <form action = "UploadServlet" method = "post"          enctype = "multipart/form-information">          <input type = "file" name = "file" size = "50" />          <br />          <input type = "submit" value = "Upload File" />       </course>    </body>     </html>

This will brandish the following issue. You lot can now select a file from the local PC and when the user clicks "Upload File", the grade gets submitted along with the selected file −

File Upload −

Select a file to upload −

NOTE − Higher up form is only dummy class and would non work, yous should try in a higher place lawmaking at your motorcar to make it work.

Writing Backend JSP Script

Let us now define a location where the uploaded files volition be stored. You tin can hard code this in your programme or this directory proper noun can also exist added using an external configuration such as a context-param element in spider web.xml equally follows −

<spider web-app> .... <context-param>     <description>Location to shop uploaded file</description>     <param-name>file-upload</param-name>     <param-value>       c:\apache-tomcat-5.5.29\webapps\data\    </param-value>  </context-param> .... </web-app>

Following is the source code for UploadFile.jsp. This can handle uploading of multiple files at a time. Let us now consider the following before proceeding with the uploading of files.

The following example depends on FileUpload; brand sure yous have the latest version of commons-fileupload.x.ten.jar file in your classpath. You lot tin can download it from https://eatables.apache.org/fileupload/.
FileUpload depends on Commons IO; make sure you have the latest version of eatables-io-x.x.jar file in your classpath. You lot can download it from https://commons.apache.org/io/.
While testing the following example, you should upload a file which is of less size than maxFileSize otherwise the file will not be uploaded.
Brand sure yous take created directories c:\temp and c:\apache-tomcat5.5.29\webapps\information well in advance.

<%@ page import = "java.io.*,java.util.*, javax.servlet.*" %> <%@ folio import = "javax.servlet.http.*" %> <%@ page import = "org.apache.commons.fileupload.*" %> <%@ page import = "org.apache.commons.fileupload.disk.*" %> <%@ folio import = "org.apache.commons.fileupload.servlet.*" %> <%@ folio import = "org.apache.eatables.io.output.*" %>  <%    File file ;    int maxFileSize = 5000 * 1024;    int maxMemSize = 5000 * 1024;    ServletContext context = pageContext.getServletContext();    String filePath = context.getInitParameter("file-upload");     // Verify the content type    String contentType = request.getContentType();        if ((contentType.indexOf("multipart/course-data") >= 0)) {       DiskFileItemFactory manufactory = new DiskFileItemFactory();       // maximum size that will be stored in memory       manufacturing plant.setSizeThreshold(maxMemSize);              // Location to save information that is larger than maxMemSize.       mill.setRepository(new File("c:\\temp"));        // Create a new file upload handler       ServletFileUpload upload = new ServletFileUpload(manufacturing plant);              // maximum file size to be uploaded.       upload.setSizeMax( maxFileSize );              effort {           // Parse the request to get file items.          Listing fileItems = upload.parseRequest(asking);           // Process the uploaded file items          Iterator i = fileItems.iterator();           out.println("<html>");          out.println("<head>");          out.println("<championship>JSP File upload</title>");            out.println("</head>");          out.println("<body>");                    while ( i.hasNext () ) {             FileItem fi = (FileItem)i.next();             if ( !fi.isFormField () ) {                // Get the uploaded file parameters                String fieldName = fi.getFieldName();                String fileName = fi.getName();                boolean isInMemory = fi.isInMemory();                long sizeInBytes = fi.getSize();                             // Write the file                if( fileName.lastIndexOf("\\") >= 0 ) {                   file = new File( filePath +                    fileName.substring( fileName.lastIndexOf("\\"))) ;                } else {                   file = new File( filePath +                    fileName.substring(fileName.lastIndexOf("\\")+1)) ;                }                fi.write( file ) ;                out.println("Uploaded Filename: " + filePath +                 fileName + "<br>");             }          }          out.println("</body>");          out.println("</html>");       } take hold of(Exception ex) {          Organisation.out.println(ex);       }    } else {       out.println("<html>");       out.println("<head>");       out.println("<championship>Servlet upload</title>");         out.println("</caput>");       out.println("<body>");       out.println("<p>No file uploaded</p>");        out.println("</body>");       out.println("</html>");    } %>

Now try to upload files using the HTML form which you created above. When y'all try http://localhost:8080/UploadFile.htm, it will brandish the following result. This will aid y'all upload any file from your local car.

File Upload −

Select a file to upload −

If your JSP script works fine, your file should be uploaded in c:\apache-tomcat5.5.29\webapps\data\ directory.