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Editorial Team
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Asked: 2026-06-18T00:04:46+00:00

I have this little java project in which I have to use jsp files.

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I have this little java project in which I have to use jsp files.
I have an html with a login button that triggers the following function:

var loginCall = "user/login";
var logoutCall = "user/logout";
var signupCall = "user/signup";

function login() {
var login = baseUrl + loginCall + "?";

var loginFormElements = document.forms.loginForm.elements;

login = addParam(login, USER_NAME, loginFormElements.userName.value, false);
login = addParam(login, PASSWORD, loginFormElements.password.value, true);

simpleHttpRequest(login, function(responseText){

    var status = evalJSON(responseText);

    if (status.errorCode == 200) {
        var res = status.results;
        var sessionId = res[0].sessionId;
        setCookie(SESSION_ID,sessionId);
        window.location="http://localhost:8080/"+baseUrl+"/main.html";
    } else {
        showError(status.errorCode, "Username or password was incorrect.")
    }

}, function(status, statusText){console.log('z');    
    showError(status, statusText);
});
}

As far as I can see a httpRequest is made and sent with data to baseUrl + loginCall, meaning localhost/something/user/login?name=somename&pass=somepass

This is where I’m stuck, do I have to make a java file somewhere somehow, that takes the request information, works it up with the database and returns an answer?
If so, where, how? Do I have to name it login/user.java?

Can anyone point me to the right direction, if not give me some code example or explanation of what I have to do next?

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1 Answer

  1. Editorial Team

    You need to have another look at the JSP MVC
    The jsp page should hold the html and javascript and java code. If you want to call a separate .java class, you need to write that class as a servlet then call it.

    So in your .jsp you have you html and javascript just like you have it there, then any java you include in these brackets <% %>

    Have a look at the tutorials here http://www.jsptut.com/

    And i see your doing a login page. I used this brilliant tutorial for creating a log in system which helped me understand how jsp and servlets worked.
    http://met.guc.edu.eg/OnlineTutorials/JSP%20-%20Servlets/Full%20Login%20Example.aspx

    Also check out this image which should help you understand the concept. Remember servlets are pure java classes, used for mostly java but can also output html, jsp’s are used for mostly html (& javascript) but can include jsp. So the servlets do the work, then the jsp gets the computed values so that they can be utilized by JavaScript. that’s how i think of it anyway, may be wrong
    http://met.guc.edu.eg/OnlineTutorials/static/article_media/jsp%20-%20servlets/LoginExample%20%5B4%5D.jpg

    All the best

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