Servlet Response

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Request and Response

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The ServletResponse is an in-built interface coming from javax.servlet package containing various methods that enable a servlet to respond to the client requests. There are various methods of ServletResponse interface, such as:

• java.io.PrintWriter getWriter(): Returns the PrintWriter object.
• void setCharacterEncoding(java.lang.String charset): Set the MIME charset (character encoding) of the response.
• void setContentLength(int len): It sets the length of the response body.
• void setContentType(java.lang.String type): Sets the type of the response data.
• void setBufferSize(int size): Sets the buffer size.
• int getBufferSize(): Returns the buffer size.
• void flushBuffer(): Forces any content in the buffer to be written to the client.
• boolean isCommitted(): Returns a boolean indicating if the response has been committed.
• void reset(): Clears the data of the buffer along with the headers and status code.
• java.lang.String getCharacterEncoding(): It returns the name of the MIME charset used in the response sent to the client.
• java.lang.String getContentType(): It returns the response content type. e.g. text, html etc.
• ServletOutputStream getOutputStream(): Returns a ServletOutputStream suitable for writing binary data in the response.

Let's see a demo program :

index.html

<!DOCTYPE html>
<html>
    <head>
        <meta charset="ISO-8859-1">
        <title>Insert title here</title>
    </head>
    <body>
        <h2><u>Login Form:</u></h2><br><br>
        <form action="MyServlet" method="get">
            <table>
                <tr><th>Username:</th><td><input type="text" name="uname">
                <tr><th>Password:</th><td><input type="password" name="pass">
                <tr><th><input type="submit" value="Submit"></th><td><input type="reset" value="Reset">
            </table>
        </form>
    </body>
</html>

MyServlet.java:

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class MyServlet extends HttpServlet
{
    public void doGet(HttpServletRequest request,HttpServletResponse response)
    throws IOException,ServletException
    {
        response.setContentType("text/html");   
        PrintWriter out=response.getWriter();

        String s1=request.getParameter("uname");
        String s2=request.getParameter("pass");

        if(s2.equals("admin"))
        out.println("Successfully Logged In");
        else
            out.println("Invalid Password");
    }
}

web.xml:

<web-app>
<servlet>
   <servlet-name>abc</servlet-name>
   <servlet-class>java8s.MyServlet1</servlet-class>
</servlet>
<servlet-mapping>
   <servlet-name>abc</servlet-name>
   <url-pattern>/MyServlet</url-pattern>
</servlet-mapping>
</web-app>

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