Why web xml in servlets




















Your proposal would support neither of them. Note that the web. Since Servlet 3. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Servlet Mapping using web. Asked 9 years, 11 months ago. Active 2 years, 10 months ago. Viewed k times. Improve this question. Mike Mike 1, 5 5 gold badges 26 26 silver badges 31 31 bronze badges. Why do you think a different XML schema would affect runtime performance?

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Overview of Java Runtime Environments. About Deployment Descriptors A web application's deployment descriptor describes the classes, resources and configuration of the application and how the web server uses them to serve web requests.

Here is a simple filter implementation that logs a message, and passes control down the chain, which may include other filters or a servlet, as described by the deployment descriptor: package mysite. IOException; import java. Logger; import javax. Filter; import javax. FilterChain; import javax. FilterConfig; import javax. ServletServlet can be used to create a default mappings for servlets. Each Web application has a default servlet.

This default servlet can be a servlet that you specify, or, if you do not specify a default servlet, WebLogic Server uses an internal servlet called the FileServlet as the default servlet. You can register any servlet as the default servlet. Writing your own default servlet allows you to use your own logic to decide how to handle a request that falls back to the default servlet.

Setting up a default servlet replaces the FileServlet and should be done carefully because the FileServlet is used to serve most files, such as text files, HTML file, image files, and more. If you expect your default servlet to serve such files, you will need to write that functionality into your default servlet. You define initialization attributes for servlets in the Web application deployment descriptor, web.

For example:. A complete code example the HelloWorldServlet illustrating these steps is included at the end of this section. This work is done by the service method of your servlet. Service methods include response objects used to create output and request objects used to receive data from the client.

These methods reply only to POST or GET requests; if you want to handle all request types from a single method, your servlet can simply implement the service method.

However, if you choose to implement the service method, you cannot implement the doPost or doGet methods, unless you call super.



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