Programming for beginners: reset()

public void reset()

The reset method clears data in the buffer when the response is not committed. Headers and status codes set by the servlet prior to the reset call must be cleared as well.

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>JSP Page</title>
    </head>
    <body>
        <form method="get" action="/servlet/GetData">
            <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>GetData</servlet-name>
        <servlet-class>GetData</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>GetData</servlet-name>
        <url-pattern>/GetData</url-pattern>
    </servlet-mapping>
</web-app>

GetData.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 GetData extends HttpServlet {
    @Override
    public void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException{
        try(PrintWriter out = res.getWriter()){
            res.setContentType("text/html");
            
            out.println("I am not going to print");
            res.reset();
            out.println("I will print");
        }
    }
}

Output

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Programming for beginners

Tuesday, 19 August 2014

reset()

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