Java – Detecting Firefox Browser
The post shows you the way how to detect if a browser is Firefox or not using Java.
1. Implementation
The code looks simple as this.
Browser.java
package com.bytenota;
import javax.servlet.http.HttpServletRequest;
public class Browser {
public static boolean detectFirefox(HttpServletRequest request) {
String userAgent = request.getHeader("User-Agent").toLowerCase();
return userAgent.contains("firefox");
}
}
In the above code, we simply look at User-Agent data (request.getHeader("User-Agent")). if it contains firefox string, the browser is Firefox. Otherwise, the browser is something else, it can be Chrome, Edge, IE, Safari, or whatever.
2. Usage and Example
Let’s create a jsp file in your web application with the following content.
index.jsp
<%@page import="com.bytenota.Browser"%>
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Java - Detecting Firefox Browser</title>
</head>
<body>
<%
if (Browser.detectFirefox(request)) {
out.write("The browser is Firefox");
} else {
out.write("The browser is not Firefox");
}
%>
</body>
</html>
Assuming that you have opened this jsp webpage in the Firefox browser. And the output you will get is:
The browser is Firefox