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Commons FileUpload example source code file (faq.fml)

This example Commons FileUpload source code file (faq.fml) is included in the "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Commons FileUpload tags/keywords

commons, fileupload, fileupload, i, io, license, license, see, struts, struts, the, the, why, you

The Commons FileUpload faq.fml source code

<?xml version="1.0"?>
 Licensed to the Apache Software Foundation (ASF) under one or more
 contributor license agreements.  See the NOTICE file distributed with
 this work for additional information regarding copyright ownership.
 The ASF licenses this file to You under the Apache License, Version 2.0
 (the "License"); you may not use this file except in compliance with
 the License.  You may obtain a copy of the License at

 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 See the License for the specific language governing permissions and
 limitations under the License.

<faqs title="FileUpload FAQ">

  <part id="general">

    <faq id="empty-parse">
        Why is parseRequest() returning no items?
        This most commonly happens when the request has already been parsed, or
        processed in some other way. Since the input stream has aleady been
        consumed by that earlier process, it is no longer available for parsing
        by Commons FileUpload.

    <faq id="read-timeout">
        Why am I getting "Read timed out" exceptions while parsing?
        The most common cause of these exceptions is when FileUpload is being
        used on a site that is using the Tomcat ISAPI redirector. There was a
        bug in earlier versions of that component that caused problems with
        multipart requests. The bug was fixed some time ago, so you probably
        just need to pick up a newer version. See the
        <a href="">Tomcat bug report
        for full details.

    <faq id="class-not-found">
        Why is NoClassDefFoundError being thrown?
        <p>There are two common causes for this error. 

<p>Firstly, it might simply mean that you do not have the Commons IO jar in your classpath. FileUpload depends on IO (see <a href="dependencies.html">dependencies) - you can tell if this is the case if the missing class is within the <code> package.

<p>Secondly this happens when attempting to rely on a shared copy of the Commons FileUpload jar file provided by your web container. The solution is to include the FileUpload jar file as part of your own web application, instead of relying on the container. The same may hold for FileUpload's IO dependency. </p> </answer> </faq> <faq id="whole-path-from-IE"> <question> Why does FileItem.getName() return the whole path, and not just the file name? </question> <answer> Internet Explorer provides the entire path to the uploaded file and not just the base file name. Since FileUpload provides exactly what was supplied by the client (browser), you may want to remove this path information in your application. You can do that using the following method from Commons IO (which you already have, since it is used by FileUpload). <pre> String fileName = item.getName(); if (fileName != null) { filename = FilenameUtils.getName(filename); } </pre> </answer> </faq> </part> <part id="struts"> <title>FileUpload and Struts <faq id="parse-in-action-fails"> <question> I'm using FileUpload in an Action, but it's not working. Why? </question> <answer> Struts recognises multipart requests, and parses them automatically, presenting the request parameters to your code in the same manner as if they were regular request parameters. Since Struts has already processed the request, and made it available in your form bean, the input stream is no longer available for parsing, so attempting to do so with FileUpload will fail. </answer> </faq> <faq id="howto-parse-in-action"> <question> But I need to parse the request myself. How can I do that? </question> <answer> Struts parses multipart a request as a part of the process of populating your form bean from that request. If, for some reason, you need to have full control over the multipart parsing, you can do so by configuring your action mapping without an associated form bean. (A better way of doing this, however, is to replace the default multipart handler with your own. See the Struts documentation for details.) </answer> </faq> </part> </faqs>

Other Commons FileUpload examples (source code examples)

Here is a short list of links related to this Commons FileUpload faq.fml source code file:

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