CODEWITHSUNDEEP
javajspservlets
user3578739
user3578739

Reputation: 35

What is the best way to communicate between a jsp page and a Servlet?

I'm making a dynamic web project in Eclipse and cannot figure out how to send a request from the user (via a button click) to a servlet that will perform some operation (including a database lookup) and then populate a webpage with the formatted results. I have all database lookup functions created. What is the best way to do this? I only really need one String to be passed back to the servlet, which will be the "category" of books that i wish to return as an ArrayList. Some sources seem to indicate that a jsp page should not even be used for relaying information to a servlet so I am very confused.

Upvotes: 2

Views: 1689

Answers (2)

MaVRoSCy
MaVRoSCy

Reputation: 17839

There are several ways to do this:

  1. Form Submit

    <form action="/myServlet" method="post">
    <input type="text" name="category" id="category"/>
    <input type="submit" value="submit" id="btnSubmit"/>

    And then in your servlet code (doPost()):

    String category = request.getParameter("category");

  2. Using ajax (jQuery ajax is much cleaner)

    $.ajax({
    method: "POST",
    url: "/myServlet",
    data: { category: $("#category").val()} //post category field
}).done(function( msg ) {
    alert( msg ); //alert html returned from servlet 
});

  3. JQuery Ajax (get)

    $("btnSubmit").click(function(event){
    event.preventDefault();
    $.get("/myServlet", function(data, status){
        alert("Data: " + data + "\nStatus: " + status);
    }); 
});

Upvotes: 4

Sergio Vilchis
Sergio Vilchis

Reputation: 322

You can send your "category" parameter writting it in the URL : Servlet/?category=scifi and use request.getParameter("category"); in the doGet method.

Upvotes: 1

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