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spam corral (Note: I'm going to use line numbering here because it makes the explanation of the example so much easier, but it isn't part of the code -- it's just there for reference.) Browser Detection in JSP <%@ page info="Greetings" errorPage="err.jsp" %>This first line simply adds some arbitrary information to the generated servlet and tells the Web server to redirect any Java errors encountered on the page to the err.jsp page. Other things that can be done in this page directive include importing various Java APIs.
spam corral <%! public final static int IE = 0; public final static int NETSCAPE = 1; public final static int WML = 2;public int getBrowser(HttpServletRequest request) { String accept = request.getHeader("ACCEPT"); if (null != accept && -1 != accept.indexOf("wml")) { return WML; } String agent = request.getHeader("USER-AGENT"); if (null != agent && -1 != agent.indexOf("MSIE")) { return IE; } return NETSCAPE; } %>This section of code declares three static values that represent the different browser types we are detecting.
spam corral It also defines the getBrowser() method that accepts the request object and uses it to determine what browser has made the request. It does so by looking at the ACCEPT HTTP request header to see if the browser will accept wml. If it doesn't, it then looks at the USER-AGENT HTTP request header to see if it contains "MSIE." If it does, then the browser making the request is IE. Otherwise, we assume it's a Netscape browser.
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