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Crystal Reports® for Borland® JBuilder®

Tutorial - Embedding the Java Viewer into your JSP Pages

Overview

This document contains a series of tutorials that demonstrates how to use the

Crystal Reports Java Viewer SDK provided with Borland® JBuilder X. The

tutorials assume that you are familiar with JSP programming. Since each tutorial

builds on the previous ones, it is recommended that you work through the series

sequentially.

The first tutorial shows you how to create a report source programmatically. A

report source is an object that represents a single instance of a report. You must

be able to create a report source before you can a) use the viewer to embed a

Crystal Report inside your JSP page, or b) use the export control to export a

Crystal Report to a variety of file formats – including PDF and RTF. The

remaining tutorials then show you how to use the report source in conjunction

with the export control and the viewer.

Contents

HOW TO CREATE A REPORT SOURCE........................................................... 2

HOW TO USE THE JAVA VIEWER ..................................................................3

Creating and initializing a Java viewer.......................................................3

Launching the viewer...................................................................................3

Performing garbage collection ....................................................................4

HOW TO EXPORT A REPORT ......................................................................... 5

Creating and initializing an Export Control................................................5

Exporting the report.....................................................................................6

Performing garbage collection ....................................................................7

HOW TO SET A PARAMETER FIELD ................................................................ 8

Creating and initializing parameter fields...................................................8

Setting parameter fields ...............................................................................9

HOW TO SET A DATABASE LOGON ..............................................................11

Creating and initializing database logon information...............................11

Setting database logon information ...........................................................12

APPENDIX A .............................................................................................14

Report sources ...........................................................................................14

Java Reporting Component........................................................................14

Java Reporting Component configuration.................................................15

Crystal Reports for Borland JBuilder Java Viewer SDK Tutorials

How to Create a Report Source

Before you can use the export control or the viewer in your JSP pages, you must

obtain a report source.

Other report sources include the Crystal Report Application Server (RAS) and

the Crystal Enterprise Page Server. The RAS report source is used when it is

desired to remote the report processing aspect of your application, or when

programmatic report modification at runtime is required. The Crystal Enterprise

Page Server is also used to remote the report processing function, but in

addition, it provides a host of other services commonly associated with an

enterprise-wide reporting system. These services include:

• Staggering the execution of reports to minimize system load, commonly

referred to as scheduling

• Archiving snapshots, or instances, of processed reports for auditing or time

series analysis

• Zero-client ad-hoc analysis

• Maintaining a repository of report objects which can be reused or

centralized for single-point update

• Managing an enterprise-wide, distributed, clustered, fail-safe reporting

infrastructure

Creating a Java Reporting Component report source only requires you to have

the location of the report you wish to view or export. The report location can be

specified using a file system path, UNC address, or URL. For more information

on the Java Reporting Component report source and specifying paths, see

“Appendix A”. Also, for the Java Reporting Component to correctly retrieve

data for a report, the report’s data sources must be correctly specified through a

JDBC connection string, or, if desired, a Java Naming and Directory Interface

(JNDI) connection.

NOTE

The Java Reporting Component uses one of two mechanisms to establish connections to

data sources. At report design-time (i.e. when reports are designed using the desktop

visual report design environment) a report designer can establish a connection to a data

source via a hard-coded JDBC connection string or via a JNDI look-up. The JNDI lookup

has the advantage of employing indirection to delay data source binding. At runtime,

when a report template is processed by the Java Reporting Component, the hand-coded

JDBC connection string entered at design-time can be used, or it can be overridden in the

deployment descriptor (web.xml). The JNDI approach relies on a JNDI directory service

running on your application server to determine how to connect to the data sources

specified in a report. Once the connection information has been retrieved from the JNDI

server, the Java Reporting Component uses the information to establish a JDBC

connection to the data source. To ensure that the Java Reporting Component can

successfully establish a connection when retrieving report data, ensure that the JNDI

entries for the required data sources are correctly configured. For more information on

how to configure a JNDI data source entry, please consult your application server's and

JDBC driver's documentation.

1. Ensure that you have imported the JPEReportSourceFactory class and the

IReportSource and IReportSourceFactory2 interfaces.

<%@ page

import=”com.crystaldecisions.reports.reportengineinterface.JPEReportSourceFactor

com.crystaldecisions.sdk.occa.report.reportsource.IReportSourceFactory2,

Crystal Reports for Borland JBuilder Java Viewer SDK Tutorials

com.crystaldecisions.reports.reportengineinterface.IReportSource”

2. Create a new JPEReportSourceFactory object.

IReportSourceFactory2 rptSrcFactory = new JPEReportSourceFactory();

3. Call the IReportSourceFactory2 object’s createReportSource method,

passing it the path to the desired report and the current locale settings. The

IReportSource object can now be used by the viewer or export control.

String report = “/reports/sample.rpt”;

IReportSource reportSource = (IReportSource)

rptSrcFactory.createReportSource(report, request.getLocale());

How to Use the Java Viewer

This tutorial demonstrates how to use the Java viewer programmatically to

display a report in a web browser.

The tutorial contains the following sections:

• Creating and initializing a Java viewer

• Launching the viewer

• Performing garbage collection

Creating and initializing a Java viewer

The viewer is simply an instance of a CrystalReportViewer class. A

CrystalReportViewer object has many set methods that affect how it displays

reports in a web browser. Some of them need to be called before the viewer can

render a report. One of these methods is used to set the report source (recall

from above that the Java Reporting Component, the Report Application Server

and the Crystal Enterprise Page Server are all possible report sources) You need

to set the viewer’s report source to the appropriate report processing entity.

1. Instantiate a CrystalReportViewer object.

CrystalReportViewer viewer = new CrystalReportViewer();

2. Set the viewer’s report source by calling its setReportSource method,

passing it a reference to a report source object.

The viewer has now been created and initialized.

viewer.setReportSource(reportSource);

NOTE

Once the viewer is created and initialized, you can set a variety of properties related to its

display characteristics, database logon handling, and parameter prompting. For more

information, see the CrystalReportViewer documentation in the Crystal Reports for

JBuilder Java API Reference provided in JBuilder X.

Launching the viewer

Once you have created and initialized a Java viewer, call its processHttpRequest

method to launch it in a web browser.

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