Web Applications and Deployment
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The document provides an overview of Java web applications and deployment using Apache Tomcat web application server. It discusses what a web container is, how Tomcat works as a web container, and how to install, run and configure Tomcat. It also describes how to create Java web applications that can be deployed as WAR files, and how to define servlets and mappings in the web deployment descriptor (web.xml). Finally, it shows how to create a simple web application and deploy it on Tomcat.
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Web Applications and Deployment
- 1. Java Web Applications and Deployment Svetlin Nakov Borislava Spasova
- 3. Using Tomcat Web Application Server
- 10. Java Web Applications Structure and Deployment
- 13. Example – Login / Logout Web Application Structure The root directory of the Web application Classes of the application (including servlets) Libraries of the application (e.g. JDBC drivers) Deployment descriptor (configuration file) Public accessible files (HTML, JSP, CSS, ...) Special directory
- 20. Sample web.xml File <?xml version="1.0" encoding="UTF-8"?> <web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"> <servlet> <servlet-name>TimeServlet</servlet-name> <servlet-class>TimeServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>TimeServlet</servlet-name> <url-pattern>/TimeServlet</url-pattern> </servlet-mapping> <session-config> <session-timeout>30</session-timeout> </session-config> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> </web-app>
- 22. Creating Web Application and Deploying on Tomcat (2) <?xml version="1.0" encoding="UTF-8"?> <web-app version="2.4" xmlns= "http://java.sun.com/xml/ns/j2ee" xmlns:xsi= "http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"> <servlet> <servlet-name> Hello Servlet</servlet-name> <servlet-class> Hello Servlet</servlet-class> </servlet> <servlet-mapping> <servlet-name> Hello Servlet</servlet-name> <url-pattern>/ Hello Servlet</url-pattern> </servlet-mapping> </web-app> web.xml
Editor's Notes
- webapp directory is considered the Web application root directory. All JSP, HTML, JavaScript files, and other resources are under this directory. The WEB-INF directory contains resources used by the application, WEB-INF is not in the public document root—no files contained in this directory structure are accessible by a client. The classes directory (under WEB-INF) contains servlets, beans, and utility classes needed for webapp's operation. lib directory (under WEB-INF) contains Java archive files (JARs), such as the JDBC driver or tag library, on which webapp depends. If a class is present in a JAR file and in the classes directory, the class loader loads the one in the classes directory.
- Notes Order matters: servlet before servlet-mapping JSP: Use jsp-file instead of servlet-class