Shulou(Shulou.com)06/02 Report--

Both Apache and Tomcat are server software that provide Web services. However, it is difficult for many people to answer or even confuse such questions as what is the connection between the two, whether they are the same thing, and whether they are dependent or not. As a developer, I have the same confusion. I looked up a lot of materials today and posted them for learning.

1. What is Apache

Apache is an open source Web server product, most of which are written in C (you can directly understand it as writing in C). The most used Web server in the world. In addition, Apache is also the name of an open source software foundation that manages a number of open source projects, including this Web server called Apache.

2. What is Tomcat

Tomcat is also an open source Web server product written in the Java language. Like the Apache server, it also provides Web services, but Tomcat is mainly used to carry server processing scripts such as JSP, CGI, and provide a running environment to process client requests, and then output HTML to return to the user. This kind of website that dynamically loads data (changeable data) on the server side and sends it back to the client browser is called dynamic website or dynamic web page. In contrast, there is also a category called static web pages, that is, pages or websites with unchanged data, which are mostly collections of HTML or HTML files.

It is also mentioned that the Tomcat project is also linked to the Apache Open Source Software Foundation and is maintained and developed as a project by the core team and programmers around the world.

3. Comparison between Apache and Tomcat

Similarities:

Both Apache and Tomcat are Web servers that support cross-platform and open source projects.

Both Apache and Tomcat are projects under the Apache Open Source Software Foundation and run on many servers around the world.

Differences:

Apache server is written in C language, and its main focus is parallel ability and load balancing. Tomcat server is written in Java, mainly as a Servlet container, so that it can be processed dynamically in the background and processed by Java and JRE.

Apache server only supports static page request processing, but does not support dynamic web page processing. To complete dynamic processing, it must be dynamically loaded into the Apache extension interface at startup, either through a plug-in or as an Apache extension module. While Tomcat supports dynamic web page processing, using CGI or Java, we use Java more, so most of the time we think of JSP when we talk about Tomcat.

4. Analysis and explanation

Apache mainly provides static page processing, and dynamic page processing is mostly controlled by other languages or third-party plug-ins as part of its extension. Think of it this way, Apache provides a relay to distribute different data requests to the corresponding modules, the PHP request is sent to the corresponding php module, and the CGI request creates a process and calls the CGI script. At this time, when the corresponding module is finished, it will be returned to the Apache server as output, and the Apache server will return these results (HTML pages) to the client browser.

While Tomcat is also a server (we will only discuss the implementation as a Java Servlet container here), it can only accept requests to JSP. Tomcat is implemented in accordance with the JSP and Servlet standards released by J2EE, fully supports these two standards, and is implemented as a Servlet container. When Tomcat receives a JSP page request, it first parses it with Tomcat to get the corresponding parameters, then finds the corresponding Servlet route, and then calls the corresponding methods in the Servlet interface (Get, Post, Delete, Put, etc.) to deal with the data or request action returned by the client. Finally, it gets the output, returns it to Tomcat,Tomcat, renders the HTTP using JSP, and sends it back to the client browser.

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