jWebForm
A simple framework for validating HTML form parameters

First, extend your javabean with jWebForm, like so:

myFormBean : extends jWebForm

Then add some vtors, a URL for success, and a URL for failure.
The bean's constructor is a good place to do this:

myFormBean()
{
    super();
    addVtor("Name", "Name is a required field", V_REQUIRED);
    addVtor("ZipCode", "Hey! Zip Codes are numeric! Sheesh...", V_NUMERIC);
    setNextURL("/myThingy/myFormSuccess");
    setBoloURL("/servlet/myFormErr");
}

Upon submission, the form should go to an instance of the DoJWebForm servlet, or a derivitive thereof. jWebForm uses a single interface for retrieving error messages: getFieldError(String paramname). To process error messages, you will need a servlet. This servlet must have access to the same jWebForm instance as was used in the form. I use a JSP, and I copy the tag info from the form's JSP file to the error-handling JSP file, setting the 'CREATE' parameter to "no":
Click here to see the error-handling servlet

• Java Servlets
  I use apache 1.3.3 and mod_jserv 0.9.12 (on linux).
  I've also used apache 1.3.3 and LiveSoftare's JRun.
  I will add compatable platforms here.
  

• Java Server Pages (JSP)
  I use gnuJSP (go Vincent!), which is also available from the Giant Java Tree.
  

• JavaBeans
  Specifically, JavaBeans embedded within a JSP. This is a bit tricky to set up, so make sure it works before going any further.

Getting jWebForm

download via http: jwebform.tar.gz