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.servlet;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
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;
@WebServlet(name = "ParameterName", urlPatterns = "/parameter-names")
public class ParameterName extends HttpServlet {
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
PrintWriter pw = response.getWriter();
// Let's obtains parameters name here!
Enumeration<String> enumeration = request.getParameterNames();
while (enumeration.hasMoreElements()) {
String parameterName = 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/parameter-names?txid=001&item=10&price=1000
Parameter = txid
Parameter = item
Parameter = price
Maven dependencies
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>4.0.1</version>
</dependency>