CODEWITHSUNDEEP
javaservlets
HitchHiker
HitchHiker

Reputation: 847

Http doPost() does not work

I am trying a simple login servlet with http doPost().

The Login.html is: 

<form action="P3" method="post">
Username :- 
<input type="text" name="usnm"><p>
Password :- 
<input type="password" name="pswd"><p>
<input type="submit" value="Login">
</form>

My servlet code is: Server.java: 

public void doPost(HttpServletRequest req,HttpServletResponse res)throws IOException,ServletException
{
    try
    {
        res.setContentType("text/html");

        String un=req.getParameter("usnm");
        String pw=req.getParameter("pswd");

        if(un.equals("abc") && pw.equals("123"))
            res.sendRedirect("welcome.html");
        else
            res.sendRedirect("nologin.html");
    }
    catch(Exception e)
    {
        System.out.println(e.getMessage());
    }
}

If login is successful then welcome.html is to be shown or else nologin.html.

I added this to my web.xml:

<servlet>
    <servlet-name>z</servlet-name>
    <servlet-class>Server</servlet-class>
</servlet>

<servlet-mapping>
    <servlet-name>z</servlet-name>
    <url-pattern>/P3</url-pattern>
</servlet-mapping>

When I try to execute the Login.html after 'Login' click, I get error: can't find the file at /C:/Users/OWNER/Desktop/apache-tomcat-7.0.37/webapps/vaishnavee/P3.

Please suggest some solution to make this work.

Upvotes: 1

Views: 721

Answers (1)

RealSkeptic
RealSkeptic

Reputation: 34608

You are probably displaying the form directly from your hard disk, rather than the tomcat server. You can probably see this in the address field of your browser: file://C:/Users/OWNER/Desktop/apache-tomcat-7.0.37/webapps/vaishnavee/Login.html instead of http://..../Login.html.

The action of the form is relative to the place where the form itself came from. So if the form itself came directly from drive C: instead of tomcat, then the browser will calculate the full URL of the action based on the same URL you see in your address field, but with Login.html replaced with P3. Of course, you don't have a file by that name so the form cannot be passed to it.

You should either:

  1. Display the form from the web server (Could be http://localhost/Login.html but you have to use whatever URL was configured for your server)
  2. Change the action of the form to the full server address including P3.

The first way is the preferred way, as serving the form directly from your C: drive is not going to work when you deploy the application or hand it out.

Upvotes: 1

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