Issue
I have a few values at JSP file, and I there is a problem with pushing radio button to the Servlet and outputting it.
The input file is in this jsp:
<label for="phone">Phone: </label>
<input type="text" name="phone" id="phone" value="${phone}"><br/><br/>
<input type="radio" name="sex" id="sex" value="${male}">Male
<input type="radio" name="sex" id="sex" value="${female}"/>Female<br/><br/>
And Servler is here: public static RequestNewEmployee fromRequestParameters(HttpServletRequest request) {
return new RequestNewEmployee(
request.getParameter("firstName"),
request.getParameter("lastName"),
request.getParameter("email"),
request.getParameter("phone"),
request.getParameter("sex"));
}
public void setAsRequestAttributes(HttpServletRequest request) {
request.setAttribute("firstName", firstName);
request.setAttribute("lastName", lastName);
request.setAttribute("email", email);
request.setAttribute("phone", phone);
request.setAttribute("sex", sex);
}
However, I don't receive any praramentr at sex field( throught all others work properly). What might be an issue?
Solution
Theory
${} is called EL expression. Inside you can have variables. From the oracle tutorial:
The web container evaluates a variable that appears in an expression by looking up its value according to the behavior of PageContext.findAttribute(String). For example, when evaluating the expression ${product}, the container will look for product in the page, request, session, and application scopes and will return its value. If product is not found, null is returned. A variable that matches one of the implicit objects described in Implicit Objects will return that implicit object instead of the variable's value.
Now lets talk about your problem.
- You can't have two html tags with identical ids.
- You receive empty parameter because, obviously, it's empty(undefined). Where did you define
maleandfemalevariables?
I think this is what you're trying to achieve:
form.jsp
<%@ page contentType="text/html;charset=UTF-8" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<form action="/formServlet">
<input type="radio" name="sex" id="sexChoice1" value="male">Male
<input type="radio" name="sex" id="sexChoice2" value="female"/>Female<br/><br/>
<input type="submit" value="submit">
</form>
</body>
</html>
FormServlet
public class FormServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) {
System.out.println(req.getParameter("sex"));
}
}
web.xml
<web-app xmlns="http://java.sun.com/xml/ns/javaee" version="2.5">
<servlet>
<servlet-name>FormServlet</servlet-name>
<servlet-class>com.artmal.controller.FormServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>FormServlet</servlet-name>
<url-pattern>/formServlet</url-pattern>
</servlet-mapping>
</web-app>
Console output after selecting 'male' option and submitting:
male
Answered By - Artem Malchenko