How do I get parameter names from servlet request?

This example show you how to obtain parameter name from servlet request. By calling request.getParameterNames() you will get an Enumeration object by iterating this object you can get the parameter names.

package org.kodejava.example.servlet;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Enumeration;

public class ParameterName extends HttpServlet {

    protected void doGet(HttpServletRequest req, HttpServletResponse res)
            throws ServletException, IOException {

        PrintWriter pw = res.getWriter();

        // Let's obtains parameters name here!
        Enumeration enumeration = req.getParameterNames();
        while (enumeration.hasMoreElements()) {
            String parameterName = (String) enumeration.nextElement();
            pw.println("Parameter = " + parameterName);
        }
        pw.close();
    }
}

When you call the servlet and pass some parameters you get the parameter name echoed on the web browser.

http://localhost:8080/java-web-examples/ParameterName?txid=001&item=10&price=1000

Parameter = price
Parameter = item
Parameter = txid

Wayan Saryada

Founder at Kode Java Org
I am a programmer, a runner, a recreational diver, currently live in the island of Bali, Indonesia. Mostly programming in Java, Spring Framework, Hibernate / JPA. You can support my works by donating here. Thank you 🙂.

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