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How does the portlet action request handling work A portlet displays content with a link to an action URL, with or without parameters, or with a form that submits to an action URL. The portal processes the action URL, and passes an action request with any parameters to the portlet s processAction() method. The processAction() method takes any steps needed for the action. If the state of the portlet needs to change, the processAction() method can set render parameters on the action response that will be valid for the portlet for every subsequent render request from another portlet action on the page. For our advanced portlet, we are going to set up an HTML form in the EDIT mode of the portlet. This form will submit to an action URL, which the portlet s processAction() method will handle as an action request.

The CreateText() method of the File class creates a new XML file at the specified location and returns a StreamWriter pointing to it The XML returned from the database is read by using the ReadToEnd() method of the StreamReader class and is then written to the XML file Finally, the Navigate() method of the Web Browser control is called to show the user the XML file There is an alternative way to do the same task Have a look at Listing 10-18 Listing 10-18 Using the ExecuteToStream() Method private void button1_Click(object sender, EventArgs e) { string strConn = @"Provider=SQLOLEDB;server=\sqlexpress;database=northwind;integrated security=SSPI"; SqlXmlCommand cmd = new SqlXmlCommand(strConn); cmdCommandText = textBox1Text; StreamWriter writer = FileCreateText(ApplicationStartupPath + @"\sqlxmlresultsxml"); cmdExecuteToStream(writerBaseStream); writerClose(); webBrowser1Navigate(ApplicationStartupPath + @"\sqlxmlresultsxml"); } The code in Listing 10-18 looks very similar to that in Listing 10-17.

The doEdit() method on the AdvancedPortlet class we ve written contains the code used to display a form to users when they select the EDIT mode for the portlet. They can select the EDIT mode through the user interface that the portal provides each portal will do this somewhat differently, but the details are not up to the portlet. The portlet can create links in its content that change the portlet s mode to EDIT, and we cover this in more detail in 4.

Now your web method can build this list of addresses with the data that was returned from the database query. You can see the code that implements this here:

The difference is that it calls the ExecuteToStream() method instead of ExecuteStream(), and by doing so emits the XML output to an existing Stream The BaseStream property of the StreamWriter class returns the underlying Stream, which is then supplied to the ExecuteToStream() method..

protected void doEdit( RenderRequest renderRequest, RenderResponse renderResponse) throws PortletException, IOException { renderResponse.setContentType("text/html"); Writer writer = renderResponse.getWriter(); //get the existing parameters to use as defaults. String title = renderRequest.getParameter("title"); String contents = renderRequest.getParameter("contents"); if (title == null) {

[WebMethod] public Addresses GetAddress(string strZIP) { AddressDataSetTableAdapters.AddressTableAdapter da = new AddressDataSetTableAdapters.AddressTableAdapter(); AddressDataSet.AddressDataTable dt = da.GetData(strZIP); Addresses addrs = new Addresses(); foreach (AddressDataSet.AddressRow row in dt.Rows) { // Create a new Address object Address addr = new Address(); // Assign the new address information addr.AddressID = row.AddressID; addr.AddressLine1 = row.AddressLine1;

2

class Program { static void Main(string[] args) { Type t = typeof(EmployeeService); Uri tcp = new Uri("net.tcp://localhost:8010/EmployeeService"); Uri http = new Uri("http://localhost:8000/EmployeeService"); ServiceHost host = new ServiceHost(t, tcp, http); host.Open(); Console.WriteLine("Published"); Console.ReadLine(); host.Close(); } } } The code retrieves the Type of the service type class by using the typeof() statement. It then creates two instances of the Uri class: one pointing to the TCP-based URL where the service is to be published and the other pointing to the HTTP-based URL. Note how the port numbers are set as 8000 and 8010 for TCP and HTTP URLs, respectively. Then an instance of the ServiceHost class is created. The ServiceHost class hosts the service by publishing the service type at the specified URIs. Note that the constructor of the ServiceHost class takes a parameter array of URIs. In our example, we have passed two, but you can pass more if you so wish. The following constructor signature will make it clear: public ServiceHost ( Type serviceType, params Uri[] baseAddresses) { ... } The Open() method of the ServiceHost class is then called. This method actually hosts the service depending on the configuration information. The service will remain published so long as the host application is live. That is why the ReadLine() method of the Console class is called. It keeps the application live until the user presses the Enter key. Finally, the Close() method of the ServiceHost class is called. This completes the host application.

title = ""; } if (contents == null) { contents = ""; } writer.write("<H1>Portlet Settings</H1>"); writer.write("<FORM ACTION="); writer.write(renderResponse.createActionURL().toString()); writer.write(">"); writer.write( "Title: <INPUT TYPE=text NAME=title VALUE='" + title + "' SIZE=25>"); writer.write( "Contents: <INPUT TYPE=text NAME=contents VALUE= '" + contents + "' SIZE=25>"); writer.write("<P>"); writer.write("<INPUT TYPE=submit>"); writer.write("</FORM>"); }