Java-Lab/App11.java at main · Rohan-San/Java-Lab · GitHub

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// index.html
<html>
<head>
<title>VoterApp</title>
</head>
<body>
  <form action= "http://localhost:8080/Proj2/check" method="get">
    <fieldset style="width:20%; background-color:#80ffcc">
      <table>
        <tr><td>Name</td><td><input type="text" name="name"></td></tr>
        <tr><td>Age</td><td><input type="text" name="age"></td></tr>
        <tr><td></td>
        <td><input type = "submit" value="Check Eligibility"></td></tr>
      </table>
    </fieldset>
  </form>
</body>
</html>

// App.java
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class App extends HttpServlet {
	public void service(HttpServletRequest req, HttpServletResponse res) throws IOException,ServletException {
		res.setContentType("text/html");
		PrintWriter pw = res.getWriter();
		String name = req.getParameter("name");
		int age = Integer.parseInt(req.getParameter("age"));
		if (age>=18) {
			pw.println("<font color='green' size='4'>Welcome "+name+" to this site</font>");
		}
		else {
			pw.println("<font color='red' size='4'>Hello "+name+", you are not authorized to visit the site</font>");
			pw.println("<br><br><a href='index.html'>back</a>");
		}
		pw.close();
	}
}

// web.xml
<servlet>
  <servlet-name>App</servlet-name>
  <servlet-class>App</servlet-class>
</servlet>
<servlet-mapping>
  <servlet-name>App</servlet-name>
  <url-pattern>/check</url-pattern>
</servlet-mapping>