[rules-users] jsp, java and drl file
Hi Friends
I am trying to create a web page with a form, so when we click on submit, we
are redirected to the result web page, but the content of this page will be
generated according to the rules i created in my drl file. Does anyone knows
the easiest way to do this? are they a way to call the drl file from the jsp
file, or the java file?
My Jsp file
<form:form method="post" action="login.htm"
commandName="loginForm"
id="loginForm">
<table>
<tr>
<td>Enter username:</td>
<td><form:input path="UserName"
style="width:250px"
maxlength="75"/></td>
</tr>
<tr>
<td>Enter password</td>
<td><form:password path="UserPassword"
style="width:250px"
maxlength="75"/></td>
</tr>
</table>
<table width="100%" border="0" cellspacing="0"
cellpadding="0">
<tr>
<td valign="top" >
<label>
<input type="submit" value="Save" />
</label>
<label>
<input type="reset" value="clear"/>
</label>
</td>
</tr>
</table>
</form:form>
My controller class
@RequestMapping(value="login.htm", method=RequestMethod.POST)
public String showAffilaiteform(Map<String, Object> model,login
loginform,BindingResult result) {
String target = AFFILIATE_REGISTRATION;
try{
testDAO.drools(loginform);
model.put("affiliateRegistrationForm", new AffiliateUserRegistration());
}catch(Exception e)
{
e.printStackTrace();
}
return target;
}
My TestDao class
public class TestDAO implements ITestDao {
public void drools(login loginform) {
try {
// load up the knowledge base
KnowledgeBase kbase = readKnowledgeBase();
StatefulKnowledgeSession ksession =
kbase.newStatefulKnowledgeSession();
KnowledgeRuntimeLogger logger =
KnowledgeRuntimeLoggerFactory.newFileLogger(ksession, "myLog");
ksession.insert(loginform);
ksession.fireAllRules();
logger.close();
} catch (Throwable t) {
t.printStackTrace();
}
}
private static KnowledgeBase readKnowledgeBase() throws Exception {
KnowledgeBuilder kbuilder =
KnowledgeBuilderFactory.newKnowledgeBuilder();
kbuilder.add(ResourceFactory.newClassPathResource("LoginRules.drl"),
ResourceType.DRL);
KnowledgeBuilderErrors errors = kbuilder.getErrors();
if (errors.size() > 0) {
for (KnowledgeBuilderError error: errors) {
System.err.println(error);
}
throw new IllegalArgumentException("Could not parse
knowledge.");
}
KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();
kbase.addKnowledgePackages(kbuilder.getKnowledgePackages());
return kbase;
}
My DRL file
import com.ri.bean.login;
rule "b"
dialect "mvel"
when
login( userName == "" ||==null)
then
System.out.println("hello");
login lo = new login();
end
These are my files and my application runs without any error.Now I want to
show a message on my jsp page when the rule violates.can anybody provide me
a small piece of code.
Regards
Brajesh
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