What is the use of tomcat in easy-to-understand terms?
Tomcat is an open source web application server that provides a running environment for web applications. Its specific functions include: 1. Processing HTTP requests and responses; 2. Providing security measures; 3. Managing sessions; 4. Load and execute Java code; 5. Provide a connection pool.
Tomcat: An easy-to-understand explanation
Tomcat is an open source web application server for Deploy and host web applications. It is similar to a hotel, providing a place for web applications to run and handling communication between them and users.
Specifically, Tomcat performs the following functions:
- Manages HTTP requests and responses: When a user accesses a web application hosted on Tomcat, Tomcat Will receive HTTP requests, process them, and send HTTP responses to the user.
- Provide security measures: Tomcat uses authentication and authorization mechanisms to ensure that only authorized users can access web applications.
- Manage Sessions: Tomcat allows web applications to track user session information to remember their preferences and actions as the user navigates the website.
- Loading and executing Java code: Tomcat can load and execute Java bytecode, which is the primary programming language used by web applications.
- Provide connection pool: Tomcat optimizes the use of database connections and manages database connections through connection pools to improve performance.
In short, Tomcat provides a running environment for web applications, handles user requests, and provides necessary security and resource management functions.
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To deploy a JAR project to Tomcat, follow these steps: Download and unzip Tomcat. Configure the server.xml file, set the port and project deployment path. Copies the JAR file to the specified deployment path. Start Tomcat. Access the deployed project using the provided URL.

To allow the Tomcat server to access the external network, you need to: modify the Tomcat configuration file to allow external connections. Add a firewall rule to allow access to the Tomcat server port. Create a DNS record pointing the domain name to the Tomcat server public IP. Optional: Use a reverse proxy to improve security and performance. Optional: Set up HTTPS for increased security.

Tomcat installation directory: Default path: Windows: C:\Program Files\Apache Software Foundation\Tomcat 9.0macOS:/Library/Tomcat/Tomcat 9.0Linux:/opt/tomcat/tomcat9 Custom path: You can specify it during installation. Find the installation directory: use whereis or locate command.

To deploy multiple projects through Tomcat, you need to create a webapp directory for each project and then: Automatic deployment: Place the webapp directory in Tomcat's webapps directory. Manual deployment: Manually deploy the project in Tomcat's manager application. Once the project is deployed, it can be accessed by its deployment name, for example: http://localhost:8080/project1.

How to check the number of concurrent Tomcat connections: Visit the Tomcat Manager page (http://localhost:8080/manager/html) and enter your user name and password. Click Status->Sessions in the left navigation bar to see the number of concurrent connections at the top of the page.

The Tomcat website root directory is located in Tomcat's webapps subdirectory and is used to store web application files, static resources, and the WEB-INF directory; it can be found by looking for the docBase attribute in the Tomcat configuration file.

The Tomcat port number can be viewed by checking the port attribute of the <Connector> element in the server.xml file. Visit the Tomcat management interface (http://localhost:8080/manager/html) and view the "Status" tab. Run "catalina.sh version" from the command line and look at the "Port:" line.

To configure Tomcat to use a domain name, follow these steps: Create a server.xml backup. Open server.xml and add the Host element, replacing example.com with your domain name. Create an SSL certificate for the domain name (if required). Add an SSL connector in server.xml, change the port, keystore file, and password. Save server.xml. Restart Tomcat.
