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Reading and Processing Client Request Parameter in Servlet
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The doGet() and doPost() methods read the HTTP requests parameter using the HttpServletRequest interface.
HttpServletRequest object contains the request information sent by the client.
Method
public String getParameter(String name)
Defined in ServletRequest interface and used to Retrieve/Read the client request parameter values.
Example
Login.html
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Login Form</title>
</head>
<body>
<form action="GetParameterDemo" method="post">
<h2>Login Form</h2>
Username:<br><input type="text" name="uname"><br>
Password:<br><input type="password" name="upass"><br>
<br><input type="submit" value="Login"><br>
</form>
</body>
</html>
GetParameterDemo.java
package skillplusplus;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@WebServlet("/GetParameterDemo")
public class GetParameterDemo extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
// TODO Auto-generated method stub
response.getWriter().println("Name: "+request.getParameter("uname"));
response.getWriter().println("Password: "+request.getParameter("upass"));
}
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
}
Output:
Run the Login.html file and enter the username and password as shown below.
