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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.
This section of code declares three static values that represent the different browser types we are detecting. 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.
In the last section of code, we used the declared getBrowser() method in a Java switch statement to determine what should be returned to the browser. For IE and Netscape browsers, a simple HTML document is returned. For WML-accepting browsers, the content type of the response is set to text/vnd.wap.wml and a WML document is returned.
In these very meaningful forty-two lines of code, we have a simple page that will serve up a pleasant greeting to three different browsers. If all has gone well, creating this code should have whetted your appetite for more. If you're interested in pushing JSP even further, then read on for a list of additional resources you can use to expand your JSP horizons.
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