Difference between revisions of "Uploading a file"

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Line 22: Line 22:
 
    
 
    
 
</html>
 
</html>
 +
</source>
 +
 +
The target Servlet
 +
<source lang="java">
 +
<%@ page import = "java.io.*,java.util.*, javax.servlet.*" %>
 +
<%@ page import = "javax.servlet.http.*" %>
 +
<%@ page import = "org.apache.commons.fileupload.*" %>
 +
<%@ page import = "org.apache.commons.fileupload.disk.*" %>
 +
<%@ page import = "org.apache.commons.fileupload.servlet.*" %>
 +
<%@ page import = "org.apache.commons.io.output.*" %>
 +
 +
<%
 +
  File file ;
 +
  int maxFileSize = 5000 * 1024;
 +
  int maxMemSize = 5000 * 1024;
 +
  ServletContext context = pageContext.getServletContext();
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  String filePath = context.getInitParameter("file-upload");
 +
 +
  // Verify the content type
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  String contentType = request.getContentType();
 +
 
 +
  if ((contentType.indexOf("multipart/form-data") >= 0)) {
 +
      DiskFileItemFactory factory = new DiskFileItemFactory();
 +
      // maximum size that will be stored in memory
 +
      factory.setSizeThreshold(maxMemSize);
 +
     
 +
      // Location to save data that is larger than maxMemSize.
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      factory.setRepository(new File("c:\\temp"));
 +
 +
      // Create a new file upload handler
 +
      ServletFileUpload upload = new ServletFileUpload(factory);
 +
     
 +
      // maximum file size to be uploaded.
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      upload.setSizeMax( maxFileSize );
 +
     
 +
      try {
 +
        // Parse the request to get file items.
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        List fileItems = upload.parseRequest(request);
 +
 +
        // Process the uploaded file items
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        Iterator i = fileItems.iterator();
 +
 +
        out.println("<html>");
 +
        out.println("<head>");
 +
        out.println("<title>JSP File upload</title>"); 
 +
        out.println("</head>");
 +
        out.println("<body>");
 +
       
 +
        while ( i.hasNext () ) {
 +
            FileItem fi = (FileItem)i.next();
 +
            if ( !fi.isFormField () ) {
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              // Get the uploaded file parameters
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              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 {
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                  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>");
 +
      } catch(Exception ex) {
 +
        System.out.println(ex);
 +
      }
 +
  } else {
 +
      out.println("<html>");
 +
      out.println("<head>");
 +
      out.println("<title>Servlet upload</title>"); 
 +
      out.println("</head>");
 +
      out.println("<body>");
 +
      out.println("<p>No file uploaded</p>");
 +
      out.println("</body>");
 +
      out.println("</html>");
 +
  }
 +
%>
 
</source>
 
</source>

Latest revision as of 09:04, 29 August 2023

Reference: https://www.tutorialspoint.com/jsp/jsp_file_uploading.htm
Needs commons-fileupload.x.x.jar and commons-io-x.x.jar download from https://commons.apache.org/fileupload/ and https://commons.apache.org/io/ Make sure the target directories are created

The upload form 

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

The target Servlet 

<%@ page import = "java.io.*,java.util.*, javax.servlet.*" %>
<%@ page import = "javax.servlet.http.*" %>
<%@ page import = "org.apache.commons.fileupload.*" %>
<%@ page import = "org.apache.commons.fileupload.disk.*" %>
<%@ page import = "org.apache.commons.fileupload.servlet.*" %>
<%@ page import = "org.apache.commons.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/form-data") >= 0)) {
      DiskFileItemFactory factory = new DiskFileItemFactory();
      // maximum size that will be stored in memory
      factory.setSizeThreshold(maxMemSize);
 
      // Location to save data that is larger than maxMemSize.
      factory.setRepository(new File("c:\\temp"));
 
      // Create a new file upload handler
      ServletFileUpload upload = new ServletFileUpload(factory);
 
      // maximum file size to be uploaded.
      upload.setSizeMax( maxFileSize );
 
      try { 
         // Parse the request to get file items.
         List fileItems = upload.parseRequest(request);
 
         // Process the uploaded file items
         Iterator i = fileItems.iterator();
 
         out.println("<html>");
         out.println("<head>");
         out.println("<title>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>");
      } catch(Exception ex) {
         System.out.println(ex);
      }
   } else {
      out.println("<html>");
      out.println("<head>");
      out.println("<title>Servlet upload</title>");  
      out.println("</head>");
      out.println("<body>");
      out.println("<p>No file uploaded</p>"); 
      out.println("</body>");
      out.println("</html>");
   }
%>
Retrieved from "https://wiki.twig.es/index.php?title=Uploading_a_file&oldid=5030"