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Home
Java
Servlet Request

Understanding Handling Client Requests

Introduction to ServletRequest class
Some Important Methods of ServletRequest

Introduction to ServletRequest class

True job of a Servlet is to handle client request. Servlet API provides two important interfaces javax.servlet.ServletRequest and javax.servlet.http.HttpServletRequest to encapsulate client request. Implementation of these interfaces provide important information about client request to a servlet.

Some Important Methods of ServletRequest

Methods	Description
Object `getAttribute(String name)`	return attribute set on request object by name
Enumeration `getAttributeName()`	return an Enumeration containing the names of the attributes available inthis request
int `getContentLength()`	return size of request body
int `getContentType()`	return media type of request content
ServletInputStream `getInputStream()`	returns a input stream for reading binary data
String `getParameter(String name)`	returns value of parameter by name
String `getLocalAddr()`	returns the Internet Protocol(IP) address of the interface on which the request was received
Enumeration `getParameterNames()`	returns an enumeration of all parameter names
String[] `getParameterValues(String name)`	returns an array of String objects containing all of the values the given request parameter has, or null if the parameter does not exist
ServletContext `getServletContext()`	return the servlet context of current request.
String `getServerName()`	returns the host name of the server to which the request was sent
int `getServerPort()`	returns the port number to which the request was sent
boolean `isSecure()`	returns a boolean indicating whether this request was made using a secure channel, such as HTTPS.
void `removeAttribute(String name)`	removes an attribute from this request
void `setAttribute(String name, Object o)`	stores an attribute in this request.

HttpServletRequest interface

HttpServletRequest interface adds the methods that relates to the HTTP protocol.

Some important methods of HttpServletRequest

Methods	Description
String `getContextPath()`	returns the portion of the request URI that indicates the context of the request
Cookies `getCookies()`	returns an array containing all of the Cookie objects the client sent with this request
String `getQueryString()`	returns the query string that is contained in the request URL after the path
HttpSession `getSession()`	returns the current HttpSession associated with this request or, if there is no current session and create is true, returns a new session
String `getMethod()`	Returns the name of the HTTP method with which this request was made, for example, GET, POST, or PUT.
Part `getPart(String name)`	gets the Part with the given name
String `getPathInfo()`	returns any extra path information associated with the URL the client sent when it made this request.
String `getServletPath()`	returns the part of this request's URL that calls the servlet

Example demonstrating Servlet Request

In this example, we will show how a parameter is passed to a Servlet in a request object from HTML page.

index.html

<form method="post" action="check">
    Name <input type="text" name="user" >
    <input type="submit" value="submit">
</form>

web.xml

<servlet>
    <servlet-name>check</servlet-name>
    <servlet-class>MyServlet</servlet-class>
</servlet>
<servlet-mapping>
    <servlet-name>check</servlet-name>
    <url-pattern>/check</url-pattern>
</servlet-mapping>

MyServlet.java

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class MyServlet extends HttpServlet {

  protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
       response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        try {
           
            String user = request.getParameter("user");
            out.println("<h2> Welcome "+user+"</h2>");
        } finally {            
            out.close();
        }
    }
}

Output :

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Understanding Handling Client Requests

Contents

Introduction to ServletRequest class

Some Important Methods of ServletRequest

HttpServletRequest interface

Some important methods of HttpServletRequest

Example demonstrating Servlet Request

Servlet Tutorial

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Python Basics Handbook

Javascript Handbook

ReactJS Projects Handbook

Computer Networks Tutorial

Operating System Tutorial

DBMS and SQL Tutorial

Java Tutorial

C Language Tutorial

PHP Tutorial

Android Tutorial

Linux Guide Tutorial

Data Structures and Algorithms Tutorial

Computer Architecture

HTML 5 References Tutorial

Docker Tutorial

GIT (Using Github) Tutorial

Go Language Tutorial

GIT Guide

CSS Tutorial

Advanced Data Structures

Spring Framework Tutorial

Spring Boot Tutorial

Kotlin Tutorial

Apache Cordova Tutorial

Python Tutorial

SASS-SCSS Tutorial

MongoDB Tutorial

Numpy Tutorial

PL-SQL Tutorial

Python Built-in Functions Tutorial

Pandas Tutorial

Elasticsearch Tutorial

Matplotlib Tutorial

Web Scraping Tutorial

Networking with Python

Tkinter Tutorial

Java Programs Tutorial

JSP Tutorial

Java Type Conversion Tutorial