Developing Web Applications with Servlet

JSP Tutorials - Herong's Tutorial Examples

∟Developing Web Applications with Servlet

This chapter provides tutorial notes and example codes on developing Web applications with Servlet technology. Topics include configuring multiple request URLs to a single Servlet class; detecting request URL path and other information; deploying Web application in a WAR file; client side and server side redirecting; supporting UTF8 encoding in Servlet pages.

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Single Servlet Class for Multiple URLs

Detect Request URL Path from Servlet

Deploy Web Applications as WAR Files

Handle HTTP POST Method in Servlet

res.sendRedirect() - Client Side Redirect

reqDispatcher.forward() - Server Side Redirect

Supporting UTF 8 in Servlet Pages

Conclusions:

You can use /MyApp/* as a URL pattern in web.xml to map multiple request URLs to a single Servlet class.
You can use req.getPathInfo() method to get the sub-path of the mapped request URL.
You can use req.getParameter() method to get named request parameters from both the query string and the request body.
You can use a WAR file to package all files required by the Web application and deploy it to the Tomcat server dynamically.
You can use res.sendRedirect() method to perform a client side redirect.
You can use req.getRequestDispatcher(new_path).forward() method to perform a server side redirect.
You can use res.setCharacterEncoding("UTF-8") and %lt;meta http-equiv=\"Content-Type\" content=\"text/html; charset=utf-8\"/> to ensure output pages and the client browser are using UTF-8 encoding.
You have to convert values returned by req.getParameter() from ISO 8859-1 to UTF 8, if the parameter is received in the request body.