JasperReports Ultimate Guide: Introduction and Setup

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"jasperreport 英文文档，包含 JasperReports 的安装、报告模板创建与编译等内容" 《JasperReports Ultimate Guide》是JasperSoft公司出版的一本详细指南，主要针对JasperReports这一强大的报表工具进行讲解。这本书的第三版版权自2002年至2010年，涵盖了JasperReports的多个方面。在开始使用JasperReports之前，首先要了解其基本要求。JasperReports可以运行在多种环境中，包括支持X11的或无头的Java环境。对于初次使用者，书中特别强调了X11/Headless Java的相关信息，这在配置运行环境时十分关键。安装JasperReports的过程中，书中提到了使用Ant构建工具。Ant是一个基于Java的构建工具，用于自动化构建过程，包括编译源代码、运行测试、打包和部署等任务。用户需要熟悉Ant的基本用法，以便构建项目并运行示例。为了体验JasperReports的功能，书中的"Building the Source Files and Running the Samples"章节介绍了如何构建源文件和运行示例。在这一过程中，用户可能需要设置HSQLDB演示数据库，这是一种轻量级的关系型数据库，常用于测试和开发目的。在实际操作中，工作流的核心是报告模板的创建和管理。"Working with Report Templates"部分详细讲解了如何创建报告模板，包括使用报告设计预览功能。报告模板可以存储和加载，以便于重复使用和共享。编译报告模板是将模板转换为可执行的Java类，这一过程涉及到表达式脚本语言和特定的报告编译器。书中还介绍了JasperReports在编译历史上的演变以及相关的配置属性。 "Expressions Scripting Language"章节深入探讨了JasperReports中的表达式和脚本，这些表达式用于动态计算和展示数据。而"Report Compilers"部分则讨论了不同的编译器选项，用户可以根据项目需求选择合适的编译器。《JasperReports Ultimate Guide》是一本全面介绍JasperReports的参考书籍，无论是初学者还是有经验的开发者，都能从中获取到关于报表设计、数据处理和系统集成的宝贵知识。通过学习这本书，用户可以掌握JasperReports的各项功能，从而高效地创建复杂的报表解决方案。

THE JASPERREPORTS ULTIMATE GUIDE

working with the JasperReports library easier. Please refer to the Ant documentation for

installation instructions.

UILDING

THE

ROJECT

FROM

OURCE

ILES

Once you have installed Ant, you can compile the source files, generate the Javadoc API

documentation, or build the distribution JAR files. To do this, execute the Ant tasks

declared in the build.xml file found in the root directory of the project tree.

To see details of each available task, launch the ant -p command from the command

prompt inside this root directory.

UNNING

THE

AMPLES

The JasperReports distribution package comes with a complete set of sample

applications and reports that show how each individual feature of the library can be used.

The samples are in the /demo/samples directory inside the project tree.

HSQLDB D

EMO

ATABASE

Some of the samples use data from an HSQLDB demo database supplied in the

/demo/hsqldb directory of the JasperReports distribution (www.hsqldb.org).

Before running those samples, start the HSQLDB database by going to the

/demo/hsqldb directory and launching ant runServer from the command prompt. To

look into the database content using a simple SQL client tool, launch the HSQLDB

Manager application by invoking ant runManager in the same directory after starting

the database.

To test a particular sample in the /demo/samples directory, go to the corresponding

sample subfolder and launch ant -p from the command line.

This displays a short description of what that sample demonstrates as well as a complete

list of Ant tasks available for use on the sample’s source files.

The following list gives the typical steps for running a sample:

1. Compile the sample’s Java source files by calling ant javac.

2. Compile the JRXML report templates used by the sample application with ant

compile.

3. Fill those report templates with data by calling ant fill.

4. View the result with ant view.

To export to other formats, simply use commands like ant pdf or ant html.

PAGE 4

THE JASPERREPORTS ULTIMATE GUIDE

The first option is recommended only in case the parent application that uses

JasperReports inside the reporting module needs to create report templates at runtime. In

most cases this is not needed because the report templates do not need to change with

every report execution, and hence static report templates could be used. Only the data

used to fill these static report templates is dynamic.

However, there are cases when the actual report template is the result of some user input.

The parent application might supply its users with a set of options when launching the

reports that might take the form of some simplified report designer or wizard. In such

cases, the actual report layout is not known or is not complete at design time, and can

only be put together after the user’s input is received.

The most common use case scenario that requires dynamically built or ad hoc report

templates (as we call them) is one in which the columns that are going to be present in a

table-like report layout are not known at design time. Instead, the user will give the

number of columns and their order inside the desired report at runtime.

Developers have to make sure that the applications they create really need ad hoc reports

and cannot rely solely on static report templates. Since dynamically built report

templates have to be compiled on the fly at runtime, they can result in a certain loss of

performance.

The second option for creating report templates is to edit JRXML files and use those

with the net.sf.jasperreports.engine.JasperCompileManager to prepare them

for filling with data. Because they are well structured and are validated against a public

XSD when parsed, these files can be easily edited using simple editors or specialized

XML editors.

EPORT

ESIGN

REVIEW

The JasperReports library does not ship with an advanced GUI tool to help design

reports. It is the iReport project from Jaspersoft which provides a high quality and up-to-

date visual designer for creating report templates.

However, the library contains a very helpful visual component that lets you preview the

report designs as you build them.

The net.sf.jasperreports.view.JasperDesignerViewer class is a simple

Swing-based Java application that can load and display a report template either in its

JRXML form or its compiled form. Even though it is not a complex GUI application and

lacks advanced functionality like dragging and dropping visual report elements, it is a

very helpful tool. All the supplied samples were initially created using this design

viewer.

All the supplied samples already have Ant tasks in their build.xml files that will launch

this design viewer to display the report templates.

PAGE 7

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