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Thread: Limit File Size or Request Size

  1. #1
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    Default Limit File Size or Request Size

    Dear all,

    I developed a web application and it is working fine, except for one issue. The application includes uploading files from a JSP to my servlet, and the issue is that i would like to have a limit for the uploaded files on the client side (before actually uploading it).

    I investigated alot and found some ways like changing my JSPs to PHPs, which is not feasable for my application. I would also like to add that using the Flash component ("<object>") for uploading is not feasable also at this time. Using ActiveX does not work also (for some security issues in javascript, it can not access the system information, also ActiveX works only on IE).

    I would like to add that I have my application running on Oracle application Server, JSPs for displaying the forms, MultiPart Java API for getting the form input values and files to my servlet and everything is developed in JAVA.

    I would like some help to solve this problem, either by limiting the file size or the limiting the whole request size sent to the servlet.

    Thanks in advance and I really appreciate your help.

  2. #2
    Super Moderator helloworld922's Avatar
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    Default Re: Limit File Size or Request Size

    You can request the file size by creating a File reference, and then calling the length() method.

    File someFile = new File("test.txt");
    System.out.println("The size of test.txt is " + someFile.length());

  3. #3
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    Default Re: Limit File Size or Request Size

    The problem is that i use the <file> tag in HTML to browse for the file. Due to security reasons, the file.value does not return the file path. Therefore, i can not use the above solution.

    Any way, thanks for your help

  4. #4
    Super Moderator Json's Avatar
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    Default Re: Limit File Size or Request Size

    You could have a look at using FileUpload - Home

    // Create a factory for disk-based file items
    DiskFileItemFactory factory = new DiskFileItemFactory();
    // Set factory constraints
    // Create a new file upload handler
    ServletFileUpload upload = new ServletFileUpload(factory);
    // Set overall request size constraint
    // Parse the request
    List /* FileItem */ items = upload.parseRequest(request);

    However I'm not sure if there is any way for you to check the size before the data has been uploaded to the server, unless you use some sort of client plugin (Flash, Applet, etc.) to check the size first.

    // Json

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