Creating Web Applications that Renders Forms

To create a web-based applications that renders forms based on fragments, perform the following steps:

1. Create a new web project.

2. Create Java application logic that represents the Java servlet.

3. Create the web page for the web application.

4. Package the web application to a WAR file.

5. Deploy the WAR file to the J2EE application server.

6. Test your web application.

The first step to create a web application that contains a Java servlet that can invoke the Forms service is to create a new web project. The Java IDE that this document is based on is Eclipse 3.3. Using the Eclipse IDE, create a web project and add the required JAR files to your project. Finally, add an HTML page named index.html and a Java servlet to your project.

The following list specifies the JAR files that you must add to your web project:

• adobe-forms-client.jar

• adobe-livecycle-client.jar

• adobe-usermanager-client.jar

• adobe-utilities.jar

For the location of these JAR files, see Including LiveCycle Java library files.

You create Java application logic that invokes the Forms service from within the Java servlet. The following code shows the syntax of the RenderFormFragment Java Servlet:

    public class RenderFormFragment extends HttpServlet implements Servlet { 
        public void doGet(HttpServletRequest req, HttpServletResponse resp 
        throws ServletException, IOException { 
        doPost(req,resp); 
         
        } 
        public void doPost(HttpServletRequest req, HttpServletResponse resp 
        throws ServletException, IOException { 
            //Add code here to invoke the Forms service 
            }

Normally, you would not place client code within a Java servlet’s doGet or doPost method. A better programming practice is to place this code within a separate class, instantiate the class from within the doPost method (or doGet method), and call the appropriate methods. However, for code brevity, the code examples in this section are kept to a minimum and code examples are placed in the doPost method.

To render a form based on fragments using the Forms service API, perform the following tasks:

1. Include client JAR files, such as adobe-forms-client.jar, in your Java project’s class path. For information about the location of these files, see Including LiveCycle Java library files.

2. Retrieve the value of the radio button that is submitted from the HTML form and specifies whether to use American or Canadian data. If American is submitted, create a com.adobe.idp.Document that stores data located in the Purchase Order US.xml. Likewise, if Canadian, then create a com.adobe.idp.Document that stores data located in the Purchase Order Canada.xml file.

3. Create a ServiceClientFactory object that contains connection properties. (See Setting connection properties.)

4. Create an FormsServiceClient object by using its constructor and passing the ServiceClientFactory object.

5. Create a URLSpec object that stores URI values by using its constructor.

6. Invoke the URLSpec object’s setApplicationWebRoot method and pass a string value that represents the application’s web root.

7. Invoke the URLSpec object’s setContentRootURI method and pass a string value that specifies the content root URI value. Ensure that the form design and the fragments are located in the content root URI. If not, the Forms service throws an exception. To reference the LiveCycle repository, specify repository://.

8. Invoke the URLSpec object’s setTargetURL method and pass a string value that specifies the target URL value to where form data is posted. If you define the target URL in the form design, you can pass an empty string. You can also specify the URL to where a form is sent in order to perform calculations.

9. Invoke the FormsServiceClient object’s renderPDFForm method and pass the following values:

   • A string value that specifies the form design name, including the file name extension.

   • A com.adobe.idp.Document object that contains data to merge with the form (created in step 2).

   • A PDFFormRenderSpec object that stores run-time options. For more information, see LiveCycle API Reference.

   • A URLSpec object that contains URI values that are required by the Forms service to render a form based on fragments.

   • A java.util.HashMap object that stores file attachments. This is an optional parameter and you can specify null if you do not want to attach files to the form.

   The renderPDFForm method returns a FormsResult object that contains a form data stream that must be written to the client web browser.

10. Create a com.adobe.idp.Document object by invoking the FormsResult object ‘s getOutputContent method.

11. Get the content type of the com.adobe.idp.Document object by invoking its getContentType method.

12. Set the javax.servlet.http.HttpServletResponse object’s content type by invoking its setContentType method and passing the content type of the com.adobe.idp.Document object.

13. Create a javax.servlet.ServletOutputStream object used to write the form data stream to the client web browser by invoking the javax.servlet.http.HttpServletResponse object’s getOutputStream method.

14. Create a java.io.InputStream object by invoking the com.adobe.idp.Document object’s getInputStream method.

15. Create a byte array populate it with the form data stream by invoking the InputStream object’s read method and passing the byte array as an argument.

16. Invoke the javax.servlet.ServletOutputStream object’s write method to send the form data stream to the client web browser. Pass the byte array to the write method.

The following code example represents the Java servlet that invokes the Forms service and renders a form based on fragments.

/* 
    * This Java Quick Start uses the following JAR files 
    * 1. adobe-forms-client.jar 
    * 2. adobe-livecycle-client.jar 
    * 3. adobe-usermanager-client.jar 
    *  
    *  (Because Forms quick starts are implemented as Java servlets, it is  
    *  not necessary to include J2EE specific JAR files - the Java project 
    *  that contains this quick start is exported as a WAR file which 
    *  is deployed to the J2EE application server) 
    *   
    *  These JAR files are located in the following path: 
    * <install directory>/sdk/client-libs 
    *  
    * For complete details about the location of these JAR files,  
    * see "Including LiveCycle library files" in Programming with LiveCycle 
    */ 
import java.io.File; 
import java.io.FileInputStream; 
import java.io.IOException; 
import java.io.PrintWriter; 
 
import javax.servlet.Servlet; 
import javax.servlet.ServletException; 
import javax.servlet.ServletOutputStream; 
import javax.servlet.http.HttpServlet; 
import javax.servlet.http.HttpServletRequest; 
import javax.servlet.http.HttpServletResponse; 
import com.adobe.livecycle.formsservice.client.*; 
import java.util.*; 
import java.io.InputStream; 
import java.net.URL; 
 
import com.adobe.idp.Document; 
import com.adobe.idp.dsc.clientsdk.ServiceClientFactory; 
import com.adobe.idp.dsc.clientsdk.ServiceClientFactoryProperties; 
 
public class RenderFormFragment extends HttpServlet implements Servlet { 
     
    public void doGet(HttpServletRequest req, HttpServletResponse resp) 
        throws ServletException, IOException { 
            doPost(req,resp);  
 
    } 
    public void doPost(HttpServletRequest req, HttpServletResponse resp) 
    throws ServletException, IOException { 
         
         
             
        try{ 
            //Set connection properties required to invoke LiveCycle                                 
            Properties connectionProps = new Properties(); 
            connectionProps.setProperty(ServiceClientFactoryProperties.DSC_DEFAULT_EJB_ENDPOINT, "jnp://hiro-xp:1099"); 
            connectionProps.setProperty(ServiceClientFactoryProperties.DSC_TRANSPORT_PROTOCOL,ServiceClientFactoryProperties.DSC_EJB_PROTOCOL);           
            connectionProps.setProperty(ServiceClientFactoryProperties.DSC_SERVER_TYPE, "JBoss"); 
            connectionProps.setProperty(ServiceClientFactoryProperties.DSC_CREDENTIAL_USERNAME, "administrator"); 
            connectionProps.setProperty(ServiceClientFactoryProperties.DSC_CREDENTIAL_PASSWORD, "password"); 
             
            //Get the value of selected radio button 
            String radioValue = req.getParameter("radio"); 
             
            //Create an Document object to store form data 
            Document oInputData = null;  
             
            //The value of the radio button determines the form data to use 
            //which determines which fragments used in the form 
            if (radioValue.compareTo("AMERICAN") == 0)            { 
                FileInputStream myData = new FileInputStream("C:\\Adobe\Purchase Order US.xml"); 
                oInputData = new Document(myData);  
            } 
            else if (radioValue.compareTo("CANADIAN") == 0)            { 
                FileInputStream myData = new FileInputStream("C:\\Adobe\Purchase Order Canada.xml"); 
                oInputData = new Document(myData);  
            } 
                     
            //Create a ServiceClientFactory object 
            ServiceClientFactory myFactory = ServiceClientFactory.createInstance(connectionProps); 
                 
            //Create a FormsServiceClient object 
            FormsServiceClient formsClient = new FormsServiceClient(myFactory);  
         
            //Set the parameter values for the renderPDFForm method 
            String formName = "Applications/FormsApplication/1.0/FormsFolder/Purchase Order Dynamic.xdp";   
                                     
            //Cache the PDF form 
            PDFFormRenderSpec pdfFormRenderSpec = new PDFFormRenderSpec(); 
            pdfFormRenderSpec.setCacheEnabled(new Boolean(true)); 
         
            //Specify URI values that are required to render a form 
            //design based on fragments 
            URLSpec uriValues = new URLSpec();  
            uriValues.setApplicationWebRoot("http://hiro-xp:8080/RenderFormFragment"); 
            uriValues.setContentRootURI("repository:///"); 
            uriValues.setTargetURL("http://hiro-xp:8080/FormsServiceClientApp/HandleData"); 
                     
            //Invoke the renderPDFForm method and write the  
            //results to a client web browser 
            FormsResult formOut = formsClient.renderPDFForm( 
                        formName,               //formQuery 
                        oInputData,             //inDataDoc 
                        pdfFormRenderSpec,      //PDFFormRenderSpec 
                        uriValues,                //urlSpec 
                        null                    //attachments 
                        ); 
         
            //Create a Document object that stores form data 
            Document myData = formOut.getOutputContent(); 
         
            //Get the content type of the response and 
            //set the HttpServletResponse object's content type 
            String contentType = myData.getContentType();  
            resp.setContentType(contentType); 
         
            //Create a ServletOutputStream object 
            ServletOutputStream oOutput = resp.getOutputStream(); 
         
            //Create an InputStream object 
            InputStream inputStream = myData.getInputStream(); 
         
            //Write the data stream to the web browser 
            byte[] data = new byte[4096]; 
            int bytesRead = 0; 
            while ((bytesRead = inputStream.read(data)) > 0) 
            { 
                oOutput.write(data, 0, bytesRead); 
            } 
     
        }catch (Exception e) { 
             System.out.println("The following exception occurred: "+e.getMessage()); 
      } 
    } 
}

The index.html web page provides an entry point to the Java servlet and invokes the Forms service. This web page is a basic HTML form that contains two radio buttons and a submit button. The name of the radio buttons is radio. When the user clicks the submit button, form data is posted to the RenderFormFragment Java servlet.

The Java servlet captures the data that is posted from the HTML page by using the following Java code:

            Document oInputData = null;  
             
            //Get the value of selected radio button 
            String radioValue = req.getParameter("radio"); 
                         
            //The value of the radio button determines the form data to use 
            //which determines which fragments used in the form 
            if (radioValue.compareTo("AMERICAN") == 0)            { 
                FileInputStream myData = new FileInputStream("C:\\Adobe\Purchase Order US.xml"); 
                oInputData = new Document(myData);  
            } 
            else if (radioValue.compareTo("CANADIAN") == 0)            { 
                FileInputStream myData = new FileInputStream("C:\\Adobe\Purchase Order Canada.xml"); 
                oInputData = new Document(myData);  
            }

The following HTML code is located in the index.html file that was created during setup of the development environment. (See Creating a web project.)

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
<html xmlns="http://www.w3.org/1999/xhtml"> 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 
<title>Untitled Document</title> 
</head> 
 
<body> 
<form name="myform" action="http://scottm-xp:8080/FragmentsWebApplication/RenderFormFragment" method="post"> 
     <table> 
     <tr> 
       <th width="344" scope="col">Forms Fragment Web Client</th> 
     </tr> 
     <tr> 
       <td> 
         <label> 
         <input type="radio" name="radio" id="radio_Data" value="CANADIAN" /> 
         Canadian data<br /> 
         </label> 
         <p> 
           <label> 
           <input type="radio" name="radio" id="radio_Data" value="AMERICAN" checked/> 
           American data</label> 
         </p> 
       </td> 
     </tr> 
     <tr> 
     <td> 
       <label> 
         <input type="submit" name="button_Submit" id="button_Submit" value="Submit" /> 
           </label> 
           </td> 
        </tr> 
       </table> 
     </form>     
</body> 
</html>

To deploy the Java servlet that invokes the Forms service, package your web application to a WAR file. Ensure that external JAR files that the component’s business logic depends on, such as adobe-livecycle-client.jar and adobe-forms-client.jar, are also included in the WAR file.

You can deploy the WAR file to the J2EE application server on which LiveCycle is deployed. After the WAR file is deployed, you can access the HTML web page by using a web browser.

After you deploy the web application, you can test it by using a web browser. Assuming that you are using the same computer that is hosting LiveCycle, you can specify the following URL:

• http://localhost:8080/FragmentsWebApplication/index.html

  Select a radio button and click the Submit button. A Form that is based on fragments will appear in the web browser. If problems occur, see the J2EE application server’s log file.