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Introduction to JSP request

Web development, programming languages, Software testing & others

Parameter passing.

To retrieve the server name, server address, server port, and other server related information.

To retrieve remote addresses of web pages over the network.

To get, set, or delete multiple attributes during the website run.

To pass information from one page to another via jsp pages using variables.

So JSP requests are one of the major sources of data exchange over the web. We will understand more about this topic with the help of syntax and examples provided below.

Syntax

The syntax used for JSP requests to function is given here. It uses the keyword “request” along with the attribute “getParameter”. The string which is to be stored under the variable “StringName” is passed as a parameter to it in the format below.

String StringName=request.getParameter("Name"); How did requests work in JSP?

JSP requests use some of the core implicit attributes from the HttpServletRequest object to pass the data further as the user progresses in a web search or website exploration. One of the easiest examples to understand is when we log in to any webpage, and we see “welcome userName” on the page as soon as we login. The “userName” is replaced dynamically as per the user who logged in.

IT is different and unique for all users. So here, “JSP request” is used to fetch the user name as per the login details entered by the user. The “Request” object by JSP keeps track of recorded information and responses as per the entered information. This is essential to make the page dynamic and responsive as per the user query.

Example of JSP request

Let’s look into one example, which is followed by an explanation for a better understanding of the concept.

JSPRequest2.jsp :

<% String Username=request.getParameter(“name”); int letter_count=obj.countcalculate(Username); out.print(“The number of letters containing in the string is “);

<%@ page language="java" contentType="text/html; charset=UTF-8"

CountCalculator.java :

package test1JSP; public class CountCalculator { public int countcalculate(String name) { String str = name; int count = 0; for (int i = 0; i < str.length(); i++) { if (Character.isLetter(str.charAt(i))) count++; } return count; } }

Output:

Explanation: This is an example; three files are used to explain how the request parameter is used in the file coming from the remote file. Three files used in this sequence:

3. java: This is an intermediary page with the business logic. In this example, we wanted to calculate the number of letters passed in the string on the landing page. The logic to calculate the number of letters in the string is written here. The if the loop is used to iterate and check each letter of the string. “Character.isLetter(str.charAt(i))” is used to check if the letter at particular iteration is a character or not. If it is a character, then the count is added with 1 each time. Suppose northern count is not added with 1 and remains as it is. This loop is terminated once it reaches the end of the string passed. Finally, an integer count is returned from this java program enabled by function countcalculate to be printed over the screen.

The JAVA file string which is passed from the landing page should again be declared as “name” so that there is no discrepancy in understanding how data flowed from the landing page to the final page. The data flow is:

Conclusion

The JSP requests are used as an important tool for passing data values and other important information from one page to another. This enables easy transition of data flow on the web. Many attributes can be used along with request objects to fully use this functionality incorporated under JSP pages.