We know that Apache has many open-source projects, many of which are used by Sun. They are also used by application server vendors in j2se and J2EE. Good open-source projects allow more developers to save time in application project development, and enable software tool development enterprises to support more mature technologies, developers can learn new designs, CodeImplementation is promising for Java applications. It's just a brief introduction.
1. Tomcat application server. JBuilder's appserver, Weblogic's application server, and IBM WebSphere's appserver are both references and references to Tomcat projects.
2. Struts web application framework, widely used in the industry.
3. Cactus EJB, Servlet, and other server-side testing frameworks
4. commons beanutils common tool project for JavaBean Components
5. commons collections general tool project, used to optimize collection classes and create more efficient collection classes
6. Database Connection provision class used by commons DBCP Tomcat
7. log4j logs
8. Velocity template Tool
9. commons fileupload File Upload
10. turbin web layer application framework
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