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This article mainly introduces "how the filter decompresses the content of Servlet and JSP pages". In daily operation, I believe many people have doubts about how the filter decompresses the content of Servlet and JSP pages. Xiaobian consulted all kinds of materials and sorted out simple and easy-to-use methods of operation. I hope it will be helpful to answer the questions of "how to extract Servlet and JSP pages by filters". Next, please follow the editor to study!

Deploy Servlet filter

In fact, there is absolutely no complexity involved in deploying filters with Web applications. Just include the filter class with the other Web component classes and put the web.xml file (along with the filter definition and filter mapping declaration) into the Web application structure as you usually do, and the Servlet container will handle everything else after that.

Many applications of filters

Your ability to use filters in J2EE Web applications is limited only by your own creativity and application design skills. You can use filters wherever it is appropriate to use decorative filter mode or interceptor mode. Some of the most common applications of filters are as follows:

Load: for all requests that reach the system, the filter collects information such as browser type, time of day, forwarding URL, and logs them.

Performance: the filter unzips the content before it reaches the Servlet and JSP pages, gets the response content, and converts it to a compressed format before sending it to the client machine.

Security: filters handle the management of authentication tokens and appropriately restrict access to security resources, prompting users to authenticate and / or direct them to third parties for authentication. Filters can even manage access control lists (Access Control List,ACL) to provide authorization mechanisms in addition to authentication. Placing security logic in filters rather than Servlet and JSP pages provides a great deal of flexibility. During development, the filter can be turned off (commented out in the web.xml file). In production applications, the filter can be enabled again. In addition, multiple filters can be added to increase the level of security, encryption, and non-deniable services as needed.

Session handling: mixing Servlet and JSP pages with session handling code can be quite troublesome. Using filters to manage sessions allows Web pages to focus on content display and delegate processing without having to worry about the details of session management.

XSLT transformations: whether using mobile clients or XML-based Web services, the ability to perform transformations between XML grammars without embedding logic into an application is absolutely invaluable.

At this point, the study on "how the filter decompresses the content of Servlet and JSP pages" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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