Note: The code is based on Java EE 6.
PathServlet.java
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 | package com.bluelotussoftware.example.servlet;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletContext;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;/** * * @author John Yeary <jyeary@bluelotussoftware.com> * @version 1.0 */@WebServlet(name = "PathServlet", urlPatterns = {"/PathServlet"})public class PathServlet extends HttpServlet { private static final long serialVersionUID = 7665375042294258750L; /** * Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods. * @param request servlet request * @param response servlet response * @throws ServletException if a servlet-specific error occurs * @throws IOException if an I/O error occurs */ protected void processRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html;charset=UTF-8"); PrintWriter out = response.getWriter(); try { ServletContext servletContext = getServletContext(); String realPath = servletContext.getRealPath("/"); out.println("<html>"); out.println("<head>"); out.println("<title>Servlet PathServlet</title>"); out.println("</head>"); out.println("<body>"); out.println("<h1>Servlet PathServlet at " + request.getContextPath() + "</h1>"); out.println("<h1>Servlet Absolute Path at: " + realPath + "</h1>"); out.println("</body>"); out.println("</html>"); } finally { out.close(); } } // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code."> /** * Handles the HTTP <code>GET</code> method. * @param request servlet request * @param response servlet response * @throws ServletException if a servlet-specific error occurs * @throws IOException if an I/O error occurs */ @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { processRequest(request, response); } /** * Handles the HTTP <code>POST</code> method. * @param request servlet request * @param response servlet response * @throws ServletException if a servlet-specific error occurs * @throws IOException if an I/O error occurs */ @Override protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { processRequest(request, response); } /** * Returns a short description of the servlet. * @return a String containing servlet description */ @Override public String getServletInfo() { return "Short description"; }// </editor-fold>} |
DirectoryLister.java
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 | package com.bluelotussoftware.example.beans;import java.io.File;import java.util.Arrays;import java.util.List;import javax.faces.bean.ManagedBean;import javax.faces.bean.RequestScoped;import javax.faces.context.FacesContext;/** * * @author John Yeary <jyeary@bluelotussoftware.com> * @version 1.0 */@ManagedBean@RequestScopedpublic class DirectoryLister { /** * Default no-argument constructor. */ public DirectoryLister() { } /** * Determines the real path (absolute) for the web application root. * @return absolute path to web application root. */ public String getRealPath() { return FacesContext.getCurrentInstance().getExternalContext().getRealPath("/"); } /** * Lists all files in the web application root. * @return files in web application root. */ public List<File> getFiles() { File f = new File(getRealPath()); return Arrays.asList(f.listFiles()); }} |
index.xhtml
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 | <?xml version='1.0' encoding='UTF-8' ?><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <h:head> <title>Absolute Path</title> </h:head> <h:body> <h1> <h:outputText value="Real Path: #{directoryLister.realPath}"/> </h1> <ul> <ui:repeat value="#{directoryLister.files}" var="file"> <li>#{file.name} : #{file.absolutePath}</li> </ui:repeat> </ul> </h:body></html> |
