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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
01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 | <!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
01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 | 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.
