Java web development is the process of developing web applications using the Java programming language. Java web applications are typically developed using the Java Servlet API and the Java Server Pages (JSP) API.

The Java Servlet API provides a way for Java programs to handle HTTP requests. Servlets are Java classes that are executed by a web server when an HTTP request is received.

The Java Server Pages (JSP) API provides a way to embed Java code in HTML pages. JSP pages are processed by a web server, which executes the Java code and generates the resulting HTML page.

There are many other APIs that can be used for Java web development, such as the JavaMail API for sending email, the Java Cryptography API for encryption, and the Java RESTful Web Services API for creating RESTful web services.

To learn more about Java programming APIs, you can refer to the following resources:

The Java API documentation: This is the official documentation for the Java API. It provides detailed information on all of the classes and interfaces in the API.
The Oracle Java tutorials: These tutorials provide step-by-step instructions on how to use the Java API.
The Java community: There are many online communities where you can ask questions and get help with Java programming.