252 lines
9.3 KiB
HTML
252 lines
9.3 KiB
HTML
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html lang="en-us" xml:lang="en-us">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta name="security" content="public" />
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<meta name="Robots" content="index,follow" />
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<meta http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' />
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<meta name="DC.Type" content="reference" />
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<meta name="DC.Title" content="Example: Creating a traversable integrated file system tree (File two of three)" />
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<meta name="abstract" content="" />
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<meta name="description" content="" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2006" />
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<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 2006" />
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<meta name="DC.Format" content="XHTML" />
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<meta name="DC.Identifier" content="treenavjava" />
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<meta name="DC.Language" content="en-us" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- Use, duplication or disclosure restricted by -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Example: Creating a traversable integrated file system tree (File
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two of three)</title>
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</head>
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<body id="treenavjava"><a name="treenavjava"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Example: Creating a traversable integrated file system tree (File
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two of three)</h1>
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<div><p></p>
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<div class="section"><p>This example code, in conjunction with the code in the other two
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example files, displays an HTMLTree and FileListElement in a servlet. The
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three files in the example are:</p>
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</div>
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<div class="section"><ul><li><a href="filetreeexamplejava.htm#filetreeexamplejava">FileTreeExample.java</a> -
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generates the HTML frames and starts the servlet</li>
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<li>TreeNav.java - this file, which builds and manages the tree</li>
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<li><a href="treelistjava.htm#treelistjava">TreeList.java</a> - displays
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the contents of selections made in the TreeNav.java class</li>
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</ul>
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</div>
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<div class="section"><div class="note"><span class="notetitle">Note:</span> Read the <a href="codedisclaimer.htm#codedisclaimer">Code
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example disclaimer</a> for important legal information.</div>
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</div>
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<div class="section"><div class="p"><pre>//////////////////////////////////////////////////////////////////////////////////
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//
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// This source is an example of using the IBM Toolbox for Java HTML
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// package classes, which allow you to easily build HTML and File Trees.
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//
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//////////////////////////////////////////////////////////////////////////////////
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import java.io.File;
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import java.io.PrintWriter;
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import java.io.IOException;
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import javax.servlet.*;
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import javax.servlet.http.*;
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import com.ibm.as400.access.AS400;
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import com.ibm.as400.access.IFSJavaFile;
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import com.ibm.as400.util.html.HTMLMeta;
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import com.ibm.as400.util.html.HTMLTree;
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import com.ibm.as400.util.html.HTMLTreeElement;
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import com.ibm.as400.util.html.URLParser;
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import com.ibm.as400.util.html.DirFilter;
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import com.ibm.as400.util.html.FileTreeElement;
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import com.ibm.as400.util.servlet.ServletHyperlink;
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//
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// An example of using the HTMLTree and FileTreeElement classes
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// in a servlet.
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//
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public class TreeNav extends HttpServlet
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{
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private AS400 sys_;
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public void init(ServletConfig config)
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throws ServletException
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{
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super.init(config);
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// Create an AS400 object.
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sys_ = new AS400("mySystem", "myUserID", "myPassword");
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// IBM Toolbox for Java uses a set of default icons to represents expanded,
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// collapsed, and documents within the HTMLTree. To enhance those icons,
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// IBM Toolbox for Java ships three gifs (expanded.gif, collapsed.gif, bullet.gif)
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// in the jt400Servlet.jar file. Browsers do not have the ability to find
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// gifs in a jar or zip file, so you need to extract those images from the
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// jar file and place them in the appropriate webserver directory (by default
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// it is the /html directory). Then change the following lines of code to
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// specify the correct location in the set methods. The location can be
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// absolute or relative.
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HTMLTreeElement.setExpandedGif("http://myServer/expanded.gif");
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HTMLTreeElement.setCollapsedGif("http://myServer/collapsed.gif");
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HTMLTreeElement.setDocGif("http://myServer/bullet.gif");
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}
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/**
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* Process the GET request.
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* @param req The request.
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* @param res The response.
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**/
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public void doGet (HttpServletRequest req, HttpServletResponse resp)
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throws ServletException, IOException
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{
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// Use session data to remember the state of the tree.
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HttpSession session = req.getSession(true);
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HTMLTree fileTree = (HTMLTree)session.getValue("filetree");
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// If this session does not already have a file tree, then
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// create the initial tree.
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if (fileTree == null)
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fileTree = createTree(req, resp, req.getRequestURI());
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// Set the Http servlet request on the HTMLTree.
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fileTree.setHttpServletRequest(req);
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resp.setContentType("text/html");
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PrintWriter out = resp.getWriter();
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out.println("<html>\n");
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out.println(new HTMLMeta("Expires","Mon, 03 Jan 1990 13:00:00 GMT"));
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out.println("<body>\n");
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// Get the tag for the HTMLTree.
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out.println(fileTree.getTag());
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out.println("</body>\n");
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out.println("</html>\n");
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out.close();
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// Set the session tree value, so when entering this servlet for
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// the second time, the FileTree object will be reused.
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session.putValue("filetree", fileTree);
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}
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/**
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* Process the POST request.
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* @param req The request.
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* @param res The response.
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**/
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public void doPost (HttpServletRequest req, HttpServletResponse res)
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throws ServletException, IOException
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{
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res.setContentType("text/html");
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ServletOutputStream out = res.getOutputStream();
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}
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/**
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* This method will create the initial HTMLTree.
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**/
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private HTMLTree createTree(HttpServletRequest req,
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HttpServletResponse resp, String uri)
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{
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// Create an HTMLTree object.
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HTMLTree tree = new HTMLTree(req);
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try
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{
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// Create a URLParser object.
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URLParser urlParser = new URLParser(uri);
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// Create a File object and set the root IFS directory.
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IFSJavaFile root = new IFSJavaFile(sys_, "/QIBM");
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// Create a Filter.
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DirFilter filter = new DirFilter();
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// Get the list of files that satisfy the directory filter.
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String[] list = root.list(filter);
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File[] dirList = new File[list.length];
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// We don't want to require webservers to use JDK1.2 because
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// most webserver JVM's are slower to upgrade to the latest
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// JDK level. The most efficient way to create these file objects
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// is to use the listFiles(filter) method in JDK1.2 which would
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// be done like the following, instead of using the list(filter)
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// method and then converting the returned string arrary into the
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// appropriate File array.
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// File[] dirList = root.listFiles(filter);
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for (int j=0; j<dirList.length; ++j)
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{
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if (root instanceof IFSJavaFile)
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dirList[j] = new IFSJavaFile((IFSJavaFile)root, list[j]);
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else
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dirList[j] = new File(list[j]);
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}
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for (int i=0; i<dirList.length; i++)
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{
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// Create a FileTreeElement for each directory in the list.
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FileTreeElement node = new FileTreeElement(dirList[i]);
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// Create a ServletHyperlink for the expand/collapse icons.
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ServletHyperlink sl = new ServletHyperlink(urlParser.getURI());
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sl.setHttpServletResponse(resp);
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node.setIconUrl(sl);
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// Create a ServletHyperlink to the TreeList servlet, which will
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// display the contents of thie FileTreeElement (directory).
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ServletHyperlink tl = new ServletHyperlink("/servlet/TreeList");
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tl.setTarget("list");
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// If the ServletHyperlink doesn't have a name, then set it to the
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// name of the directory.
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if (tl.getText() == null)
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tl.setText(dirList[i].getName());
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// Set the TextUrl for the FileTreeElement.
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node.setTextUrl(tl);
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// Add the FileTreeElement to the HTMLTree.
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tree.addElement(node);
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}
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sys_.disconnectAllServices();
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}
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catch (Exception e)
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{
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e.printStackTrace();
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}
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return tree;
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}
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public void destroy(ServletConfig config)
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{
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// do nothing
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}
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public String getServletInfo()
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{
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return "FileTree Navigation";
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}
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}</pre>
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</div>
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</div>
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</div>
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</body>
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</html>
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