Working with Microsoft Excel spreadsheets and Microsoft Access databases in a Java application

Sean SullivanJuly 27, 2006

This presentation is available athttp://oscon2006.sourceforge.net/

•Introduction

•Jakarta POI project

•Jackcess project

•Demo: web application

•Demo: Swing application

Overview

•Java class library for reading and writing Microsoft Office documents

•Apache License 2.0

•http://jakarta.apache.org/poi

Jakarta POI

•Read/write OLE2 Compound Document Format

•Read/write Microsoft Office documents

• XLS

• PPT

• DOC

•Not supported

• MDB

• VSD

POI features

Who is using Jakarta POI?

•POIFS: low-level file I/O

•HSSF: Horrible Spreadsheet Format

•HWPF: Horrible Word-processing Format

•HSLF: Horrible Slide Format

•HPSF: Horrible Property Set Format

•DDF: Dreadful Drawing Format

POI terminology

Microsoft Excel file format

222 pages!

Packages

• org.apache.poi.hssf• org.apache.poi.hssf.eventusermodel• org.apache.poi.hssf.usermodel

Core classes

• HSSFWorkbook• HSSFSheet• HSSFRow• HSSFCell• HSSFCellStyle

Working with XLS files

Demo: Hello POI

@see HelloPoi.java

Yes!

HSSFCell• getCellFormula• setCellFormula("formulaString")

HSSFFormulaEvaluator • evaluate(HSSFCell)

Can I use formulas?

•Macros - must load from a template XLS file

•Charts - limited support

•Pivot tables - not supported

Other POI topics

•Java class library for reading and writing MDB files

•developed by Health Market Science Inc.

•LGPL

•requires JRE 1.5 or higher

•http://jackcess.sourceforge.net/

Jackcess project

•Read/write Microsoft Access MDB files*

•Copy ResultSet to MDB table

•Copy CSV file to MDB table

Jackcess features

* Microsoft Access 2000 only

Package:

com.healthmarketscience.jackcess

Core classes:

• Database• Table• Column• DataType

Jackcess API

Hello JackcessDatabase db = Database.open(new File("demo.mdb"));for (String tname: db.getTableNames()){ Table t = db.getTable(tname); Map<String, Object> row; while ((row = t.getNextRow()) != null) { for (String colName : row.keySet()) { System.out.println(row.get(colName)); } }}

•Eclipse 3.2

•WebTools 1.5

•Subversion 1.3.x

•Subclipse 1.1.x

•Tomcat 5.5.17

•Firefox 1.5.0.5

•Maven 2.0.4

Web application demo

•POI 3.0 alpha 2

•Jackcess 1.1.5

•OpenCSV 1.5

•Wicket 1.2

•Derby 10.1.2.1

•Log4j 1.2.13

•Sun JDK 1.5

•javax.swing.JTable

•javax.swing.table.TableModel

•Jakarta POI

Swing demo

Summary

• Use POI to read/write XLS files

http://jakarta.apache.org/poi/

• Use Jackcess to read/write MDB files

http://jackcess.sourceforge.net/

• This presentation

http://oscon2006.sourceforge.net/