Programming for beginners: addHeader (String name, String value)

public void addHeader(String name, String value)

The addHeader method adds a header value to the set with a given name. If there are no headers already associated with the name, a new set is created.

Main.jsp

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
   
     <title>set Header</title>
    </head>
    <body>
        <form method="get" action="/servlet/AddHeader">
            <input type="submit" value ="Get Data">
        </form>
    </body>
</html>

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.1" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd">
    <servlet>
        <servlet-name>AddHeader</servlet-name>
        <servlet-class>AddHeader</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>AddHeader</servlet-name>
        <url-pattern>/AddHeader</url-pattern>
    </servlet-mapping>
</web-app>

AddHeader.java

import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class AddHeader extends HttpServlet {
    @Override
    public void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException{
        try(PrintWriter out = res.getWriter()){
            res.setContentType("text/html");
            res.addHeader("Refresh", "5; URL=https://self-learning-java-tutorial.blogspot.com/2014/02/blog-post.html");
            try{
                Thread.sleep(10000);
            }
            catch(InterruptedException e){
                
            }
        }
    }    
}

Output

After 5 seconds the page redirect to ' https://self-learning-java-tutorial.blogspot.com/2014/02/blog-post.html'

Note:

Using refresh header we can instruct a web browser to automatically refresh the current web page or frame after a given time interval.

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Programming for beginners

Thursday, 21 August 2014

addHeader (String name, String value)

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