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Editorial Team
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Asked: 2026-06-18T05:27:32+00:00

I am able to get the form data using the buffer handler, but it

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I am able to get the form data using the buffer handler, but it is a void function and I cannot return the form data values. Have about 4-7 forms total, I don’t want to end up writing the same handler over and over because the default function is void.

html:

<!DOCTYPE html>
<html>    
<head><title>Login Page</title></head>
<body>
    <a href="/activateUserPage">activate user</a>
    <br/>
    <a href="/login">log in</a>
    <br/>

    <form id='login' action='/login' method='post'>
        <fieldset >
            <legend>Login</legend>
            <input type='hidden' name='submitted' id='submitted' value='1'/>

            <label for='username' >UserName: </label>
            <input type='text' name='username' id='username'  maxlength="50"/>

            <label for='password' >Password: </label>
            <input type='password' name='password' id='password' maxlength="50"/>

            <input type='submit' name='Submit' value='Submit' />
        </fieldset>
    </form>         
</body>    
</html>

java:

import org.jboss.netty.handler.codec.http.QueryStringDecoder;
import org.vertx.java.core.Handler;
import org.vertx.java.core.Vertx;
import org.vertx.java.core.buffer.Buffer;
import org.vertx.java.core.http.HttpServer;
import org.vertx.java.core.http.HttpServerRequest;
import org.vertx.java.core.http.RouteMatcher;
import org.vertx.java.deploy.Verticle;

import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.Set;

/**
 * Created by IntelliJ IDEA.
 * User: yao
 * Date: 1/17/13
 * Time: 2:22 PM
 */

public class Main extends Verticle
{
    @Override
    public void start() throws Exception
    {
        System.out.println("starting the vertx stuff");
        final String host = "localhost";
        final String port = "8181";

        Vertx vertx = Vertx.newVertx();
        HttpServer httpServer = vertx.createHttpServer();

        ...

        httpServer.requestHandler(new Handler<HttpServerRequest>()
        {
            public void handle(HttpServerRequest req)
            {
                String path = req.path;

                /* start mapping of page urls*/
                // redirect user to the login page
                if (path.equals("/"))
                {
                    req.response.sendFile(dir + "html/loginPage.html");
                }
                ...

                /* end mapping of page urls*/

                /* start mapping of form urls */
                // login
                else if (path.equals(login))
                {
                    mainLogin();
                    getFormData(req);
                }
                ...

                /* end mapping of form urls */

                /* all other pages */
                else
                {
                    req.response.end("404 - page no exist");
                }
            }
        });

        System.out.println("vertx listening to: " + host + " " + port);
        httpServer.listen(Integer.valueOf(port), host);
    }

    ...

    private void getFormData(final HttpServerRequest req)
    {
        req.bodyHandler(new Handler<Buffer>()
        {
            @Override
            public void handle(Buffer buff)
            {
                String contentType = req.headers().get("Content-Type");
                if ("application/x-www-form-urlencoded".equals(contentType))
                {
                    QueryStringDecoder qsd = new QueryStringDecoder(buff.toString(), false);
                    Map<String, List<String>> params = qsd.getParameters();
                    System.out.println(params);
                }
            }
        });
    }
}
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1 Answer

  1. Editorial Team

    what i did in the end is basically this:

    do the ajax call using post, the data from the form needs to be serialized.

    $.ajax
({
    type: "POST",
    url: "/login",
    data: $('#frm_login').serialize(),
    success: function(data)
...

    in the backend, vertx receives this data as a buffer. rest is to parse the buffer by splitting by “&” and “=”.

    Map<String, String> params = new HashMap<String, String>();
String[] paramSplits = buffer.toString().split("&");
String[] valueSplits;

if (paramSplits.length > 1)
{
    for (String param : paramSplits)
    {
        valueSplits = param.split("=");
        if (valueSplits.length > 1)
        {
            // add this check to handle empty phone number fields
            params.put(decode(valueSplits[0]), decode(valueSplits[1]));
        }
    }
}

    hope this will help others!

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