Programming for beginners: getPathInfo()

public String getPathInfo()

Returns any extra path information associated with the URL the client sent when it made this request. The extra path information follows the servlet path but precedes the query string and will start with a "/" character. This method returns null if there was no extra path information.

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>Get Books</title>
    </head>
    <body>
        <form method="get" action="/servlet/GetBooks/GetMyBook">
           <select name="author">
                <option>Yashavant Kanetkar</option>
                <option>Deitel</option>
                <option>Herbert Schildt</option>
                <option>Bruce Eckel</option>
          </select> 
            <input type="submit" value="submit" />
        </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>GetBooks</servlet-name>
        <servlet-class>GetBooks</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>GetBooks</servlet-name>
        <url-pattern>/GetBooks/GetMyBook</url-pattern>
    </servlet-mapping>
</web-app>

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;
import java.util.*;

public class GetBooks extends HttpServlet {
    
    @Override
    public void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException{
       PrintWriter out = res.getWriter();
       String author;
       List<String> books;
       Iterator<String> iter;
       StringBuilder body = new StringBuilder();
       res.setContentType("text/html");
      
       String header = "<html>" +
                    "<head>" +
                    "<title> Hello World </title>" +
                    "</head>" +
                    "<body>" +
                    "<h1> <br />";                     
       String footer = "</h1> </body>" +
                    "</html>";
       
       String contextPath = req.getContextPath();
       String servletPath = req.getServletPath();
       String pathInfo = req.getPathInfo();
       
       body.append("ContextPath ").append(contextPath).append("<br />");
       body.append("Servlet Path ").append(servletPath).append("<br />");
       body.append("Path Info ").append(pathInfo).append("<br />");
       out.println(header + "" + body + footer);
    }
}

Output

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Programming for beginners

Friday 1 August 2014

getPathInfo()

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