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Often we are not interested in the entire XML document loaded in memory but a part of it. This requires us to search for a specific element or node for further processing. There are several methods used to search the XML document: Retrieving specific elements using the GetElementByTagName() method Retrieving specific elements using the GetElementById() method Selecting specific nodes using the SelectNodes() method Selecting a single specific node using the SelectSingleNode() method

To demonstrate the basic steps in the life cycle, let s first look at a simple portlet that implements the Portlet interface directly. Portlets need to implement this interface, either directly, or indirectly by extending a class that has already implemented the interface. Here is a devastatingly simple portlet example:

When you click OK, Visual Studio will create the web site and launch the IDE, which enables you to create and edit your application s various web form pages and support files..

The GetElementsByTagName() method of the XmlDocument class accepts the name of the tag (excluding < and >) and returns all the nodes matching that tag name. The matching nodes are returned as an XmlNodeList. The XmlNodeList class represents a collection of XmlNode objects. To see GetElementsByTagName() in action, we need to develop a Windows application like the one shown in Figure 2-4.

package com.portalbook.crawler; import java.io.*; import javax.portlet.*; public class SimplePortlet implements Portlet { public SimplePortlet() { } public void destroy() { portletCounter--; }

The wizard will complete, and your virtual directory will be ready, but empty. Add a new text file to the directory by using IIS Manager or Windows Explorer. Call it test.htm and give it the following contents:

3

Figure 2-4. Using the GetElementsByTagName() method The application consists of a text box to enter the tag name to look for. After you click the Search button, the matching tags are displayed in the list box. Selecting a tag from the list box displays its contents in a read-only text box. The code that makes the preceding form work is given in Listing 2-5. Listing 2-5. Using the GetElementsByTagName() Method XmlNodeList list = null; private void button1_Click(object sender, EventArgs e) { XmlDocument doc = new XmlDocument(); doc.Load(Application.StartupPath + "/employees.xml"); list = doc.GetElementsByTagName(textBox1.Text); listBox1.Items.Clear(); foreach (XmlNode node in list) { listBox1.Items.Add(node.Name); } } private void listBox1_SelectedIndexChanged(object sender, EventArgs e) { textBox2.Text = list[listBox1.SelectedIndex].InnerXml; }

public void init(PortletConfig config) throws PortletException { portletCounter++; } public void processAction( ActionRequest request, ActionResponse response) throws PortletException, IOException { actionCounter++; } public void render( RenderRequest request, RenderResponse response) throws PortletException, IOException { renderCounter++; response.setTitle("Simple Portlet"); response.setContentType("text/html"); PrintWriter out = response.getWriter(); out.write("The server has instantiated " + portletCounter + " copies of the portlet<br>"); out.write("This portlet has been rendered " + renderCounter + " times (including this one)<br>"); out.write("This portlet has received " + actionCounter + " action requests<br>"); PortletURL action = response.createActionURL(); out.write("Click <a href=\""); out.write(action.toString()); out.write("\">here</a> to trigger an action.<br>"); }

Now, from a browser, you can call http://serverIP/6Test/test.htm or http:// serverurl/6Test/test.htm, and the browser will render a page according to the instructions in the preceding HTML code. You can see this in Figure 6-6 where the IP address of the server is used.