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Thread: Any way to write html form data to file?

  1. #1
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    Default Any way to write html form data to file?

    So I'm doing an online survey of sorts. I have the following html code:

    Do you think this song was written by a human or by a computer?<br />
    <form name="input" action="o.jar" method="get">
    <input type="radio" name="human" value="true" /> Written by human<br />
    <input type="radio" name="human" value="false" /> Written by computer<br />
    <input type="submit" value="Submit" />
    </form>

    I would like to write a java app, o.jar, that does the following:
    If (human=="true") {
    read a number from the file "count.dat" on the server;
    increment that number;
    writes it back to the file;
    } Else Do Nothing;

    This may be a noob question but I've never done any server-side java programming... Should I just use standard java file I/O to read and write data from the file? How do you go about getting the value of the html variable "human" into the java program?

    Thanks in advance.


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    Administrator copeg's Avatar
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    Default Re: Any way to write html form data to file?

    First, you should use equals() rather than == when comparing strings. To get the submitted value, you retrieve the values using form submission (either through GET or POST which passes key/value pairs)....depending upon the context of the server this is done through the ServletRequest object, using the getParameter method.Lots of tutorials about this online that can do a much better job than I at explaining it. You can use standard I/O, however multiple requests might cause a concurrency issue with the file. Stick the info into a database and this issue is dealt with appropriately.

    PS Had to look up the project...quite interesting.

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