JEExplorer

Stand-alone or integrated into an existing Java/J2EE web application, JEExplorer is a valuable administration utility enabling managing of files and directories on your server file system.
JEExplorer is designed to be easily integrated with existing web applications. It consists of only a single JSP and jar file, with no external dependencies whatsoever. Additionally, JEExplorer has no requirements for the client - no JavaScript/applets or anything else is required for the application to run.
The application comes as a Java/J2EE war file which can be installed on any Java server, f.ex. Apache Tomcat, JBoss etc. To integrate with an existing application, simply drop the JSP file anywhere in the web application.