Apache POI Word - Quick Guide

Apache POI Word - Overview

Many a time, a software application is required to generate reference documents in Microsoft Word file format. Sometimes, an application is even expected to receive Word files as input data.

Any Java programmer who wants to produce MS-Office files as output must use a predefined and read-only API to do so.

What is Apache POI?

Apache POI is a popular API that allows programmers to create, modify, and display MS-Office files using Java programs. It is an open source library developed and distributed by Apache Software Foundation to design or modify MS-Office files using Java program. It contains classes and methods to decode the user input data or a file into MS-Office documents.

Components of Apache POI

Apache POI contains classes and methods to work on all OLE2 Compound documents of MS-Office. The list of components of this API is given below −

• POIFS (Poor Obfuscation Implementation File System) − This component is the basic factor of all other POI elements. It is used to read different files explicitly.

• HSSF (Horrible SpreadSheet Format) − It is used to read and write .xls format of MS-Excel files.

• XSSF (XML SpreadSheet Format) − It is used for .xlsx file format of MS-Excel.

• HPSF (Horrible Property Set Format) − It is used to extract property sets of the MS-Office files.

• HWPF (Horrible Word Processor Format) − It is used to read and write .doc extension files of MS-Word.

• XWPF (XML Word Processor Format) − It is used to read and write .docx extension files of MS-Word.

• HSLF (Horrible Slide Layout Format) − It is used to read, create, and edit PowerPoint presentations.

• HDGF (Horrible DiaGram Format) − It contains classes and methods for MS-Visio binary files.

• HPBF (Horrible PuBlisher Format) − It is used to read and write MS-Publisher files.

This tutorial guides you through the process of working on MS-Word files using Java. Therefore the discussion is confined to HWPF and XWPF components.

Note − OLDER VERSIONS OF POI SUPPORT BINARY FILE FORMATS SUCH AS DOC, XLS, PPT, ETC. VERSION 3.5 ONWARDS, POI SUPPORTS OOXML FILE FORMATS OF MS-OFFICE SUCH AS DOCX, XLSX, PPTX, ETC.

Apache POI Word - Installation

This chapter takes you through the process of setting up Apache POI on Windows and Linux based systems. Apache POI can be easily installed and integrated with your current Java environment, following a few simple steps without any complex setup procedures. User administration is required while installation.

System Requirements

Let us now proceed with the steps to install Apache POI.

Step 1: Verify your Java Installation

First of all, you need to have Java Software Development Kit (SDK) installed on your system. To verify this, execute any of the two commands mentioned below, depending on the platform you are working on.

If the Java installation has been done properly, then it will display the current version and specification of your Java installation. A sample output is given in the following table −

• We assume that the readers of this tutorial have Java SDK version 1.7.0_60 installed on their system.

• In case you do not have Java SDK, download its current version from https://www.oracle.com/technetwork/java/javase/downloads/index.html and have it installed.

Step 2: Set your Java Environment

Set the environment variable JAVA_HOME to point to the base directory location where Java is installed on your machine. For example,

Append the full path of Java compiler location to the System Path.

Execute the command java - version from the command prompt as explained above.

Step 3: Install Apache POI Library

Download the latest version of Apache POI from https://poi.apache.org/download.html and unzip its contents to a folder from where the required libraries can be linked to your Java program. Let us assume the files are collected in a folder on C drive.

The following images shows the directories and the file structure inside the downloaded folder −

Add the complete path of the five jars as highlighted in the above image to the CLASSPATH.

Apache POI Word - Core Classes

This chapter takes you through the classes and methods of Apache POI for managing a Word document.

Document

This is a marker interface (interface do not contain any methods), that notifies that the implemented class can be able to create a word document.

XWPFDocument

This is a class under org.apache.poi.xwpf.usermodel package. It is used to create MS-Word Document with .docx file format.

Class Methods

For the remaining methods of this class, refer the complete API document at −

Package org.apache.poi.openxml4j.opc.internal.

XWPFParagraph

This is a class under org.apache.poi.xwpf.usermodel package and is used to create paragraph in a word document. This instance is also used to add all types of elements into word document.

Class Methods

For the remaining methods of this class, refer the complete API document at −

POI API Documentation

XWPFRun

This is a class under org.apache.poi.xwpf.usermodel package and is used to add a region of text to the paragraph.

Class Methods

For the remaining methods of this class, refer the complete API document at −

POI API Documentation

XWPFStyle

This is a class under org.apache.poi.xwpf.usermodel package and is used to add different styles to the object elements in a word document.

Class Methods

For the remaining methods of this class, refer the complete API document at −

POI API Documentation

XWPFTable

This is a class under org.apache.poi.xwpf.usermodel package and is used to add table data into a word document.

Class Methods

For the remaining methods of this class, refer the complete API document at: POI API Documentation

XWPFWordExtractor

This is a class under org.apache.poi.xwpf.extractor package. It is a basic parser class used to extract the simple text from a Word document.

Class Methods

For the remaining methods of this class, refer the complete API document at: POI API Documentation

Apache POI Word - Document

Here the term 'document' refers to a MS-Word file. After completion of this chapter, you will be able to create new documents and open existing documents using your Java program.

Create Blank Document

The following simple program is used to create a blank MS-Word document −

import java.io.File;
import java.io.FileOutputStream;
import org.apache.poi.xwpf.usermodel.XWPFDocument;

public class CreateDocument {

   public static void main(String[] args)throws Exception  {
   
      //Blank Document
      XWPFDocument document = new XWPFDocument(); 
		
      //Write the Document in file system
      FileOutputStream out = new FileOutputStream( new File("createdocument.docx"));
      document.write(out);
      out.close();
      System.out.println("createdocument.docx written successully");
   }
}

Save the above Java code as CreateDocument.java, and then compile and execute it from the command prompt as follows −

$javac  CreateDocument.java
$java CreateDocument

If your system environment is configured with the POI library, it will compile and execute to generate a blank Excel file named createdocument.docx in your current directory and display the following output in the command prompt −

createdocument.docx written successfully

Apache POI Word - Paragraph

In this chapter you will learn how to create a Paragraph and how to add it to a document using Java. Paragraph is a part of a page in a Word file.

After completing this chapter, you will be able to create a Paragraph and perform read operations on it.

Create a Paragraph

First of all, let us create a Paragraph using the referenced classes discussed in the earlier chapters. By following the previous chapter, create a Document first, and then we can create a Paragraph.

The following code snippet is used to create a spreadsheet −

//Create Blank document
   XWPFDocument document = new XWPFDocument();

//Create a blank spreadsheet
   XWPFParagraph paragraph = document.createParagraph();

Run on Paragraph

You can enter the text or any object element, using Run. Using Paragraph instance you can create run.

The following code snippet is used to create a Run.

XWPFRun run = paragraph.createRun();

Write into a Paragraph

Let us try entering some text into a document. Consider the below text data −

At howcodex.com, we strive hard to provide quality tutorials for self-learning
purpose in the domains of Academics, Information Technology, Management and Computer
Programming Languages.

The following code is used to write the above data into a paragraph.

import java.io.File;
import java.io.FileOutputStream;
import org.apache.poi.xwpf.usermodel.XWPFDocument;
import org.apache.poi.xwpf.usermodel.XWPFParagraph;
import org.apache.poi.xwpf.usermodel.XWPFRun;

public class CreateParagraph {

   public static void main(String[] args)throws Exception {

      //Blank Document
      XWPFDocument document = new XWPFDocument(); 
      
      //Write the Document in file system
      FileOutputStream out = new FileOutputStream(new File("createparagraph.docx"));
        
      //create Paragraph
      XWPFParagraph paragraph = document.createParagraph();
      XWPFRun run = paragraph.createRun();
      run.setText("At howcodex.com, we strive hard to " +
         "provide quality tutorials for self-learning " +
         "purpose in the domains of Academics, Information " +
         "Technology, Management and Computer Programming
         Languages.");
			
      document.write(out);
      out.close();
      System.out.println("createparagraph.docx written successfully");
   }
}

Save the above Java code as CreateParagraph.java, and then compile and run it from the command prompt as follows −

$javac CreateParagraph.java
$java CreateParagraph

It will compile and execute to generate a Word file named createparagraph.docx in your current directory and you will get the following output in the command prompt −

createparagraph.docx written successfully

The createparagraph.docx file looks as follows.

Apache POI Word - Borders

In this chapter, you will learn how to apply border to a paragraph using Java programming.

Applying Border

The following code is used to apply Borders in a Document −

import java.io.File;
import java.io.FileOutputStream;
import org.apache.poi.xwpf.usermodel.Borders;
import org.apache.poi.xwpf.usermodel.XWPFDocument;
import org.apache.poi.xwpf.usermodel.XWPFParagraph;
import org.apache.poi.xwpf.usermodel.XWPFRun;

public class ApplyingBorder {

   public static void main(String[] args)throws Exception {

      //Blank Document
      XWPFDocument document = new XWPFDocument(); 
        
      //Write the Document in file system
      FileOutputStream out = new FileOutputStream(new File("applyingborder.docx"));
        
      //create paragraph
      XWPFParagraph paragraph = document.createParagraph();
        
      //Set bottom border to paragraph
      paragraph.setBorderBottom(Borders.BASIC_BLACK_DASHES);
        
      //Set left border to paragraph
      paragraph.setBorderLeft(Borders.BASIC_BLACK_DASHES);
        
      //Set right border to paragraph
      paragraph.setBorderRight(Borders.BASIC_BLACK_DASHES);
        
      //Set top border to paragraph
      paragraph.setBorderTop(Borders.BASIC_BLACK_DASHES);
        
      XWPFRun run = paragraph.createRun();
         run.setText("At howcodex.com, we strive hard to " +
         "provide quality tutorials for self-learning " +
         "purpose in the domains of Academics, Information " +
         "Technology, Management and Computer Programming " +
         "Languages.");
        
      document.write(out);
      out.close();
      System.out.println("applyingborder.docx written successully");
   }
}

Save the above code in a file named ApplyingBorder.java, compile and execute it from the command prompt as follows −

$javac ApplyingBorder.java
$java ApplyingBorder

If your system is configured with the POI library, then it will compile and execute to generate a Word document named applyingborder.docx in your current directory and display the following output −

applyingborder.docx written successfully

The applyingborder.docx file looks as follows −

Apache POI Word - Tables

In this chapter, you will learn how to create a table of data in a document. You can create a table data by using XWPFTable class. By adding each Row to table and adding each cell to Row, you will get table data.

Create Table

The following code is used to creating table in a document −

import java.io.File;
import java.io.FileOutputStream;
import org.apache.poi.xwpf.usermodel.XWPFDocument;
import org.apache.poi.xwpf.usermodel.XWPFTable;
import org.apache.poi.xwpf.usermodel.XWPFTableRow;

public class CreateTable {

   public static void main(String[] args)throws Exception {

      //Blank Document
      XWPFDocument document = new XWPFDocument();
        
      //Write the Document in file system
      FileOutputStream out = new FileOutputStream(new File("create_table.docx"));
        
      //create table
      XWPFTable table = document.createTable();
		
      //create first row
      XWPFTableRow tableRowOne = table.getRow(0);
      tableRowOne.getCell(0).setText("col one, row one");
      tableRowOne.addNewTableCell().setText("col two, row one");
      tableRowOne.addNewTableCell().setText("col three, row one");
		
      //create second row
      XWPFTableRow tableRowTwo = table.createRow();
      tableRowTwo.getCell(0).setText("col one, row two");
      tableRowTwo.getCell(1).setText("col two, row two");
      tableRowTwo.getCell(2).setText("col three, row two");
		
      //create third row
      XWPFTableRow tableRowThree = table.createRow();
      tableRowThree.getCell(0).setText("col one, row three");
      tableRowThree.getCell(1).setText("col two, row three");
      tableRowThree.getCell(2).setText("col three, row three");
	
      document.write(out);
      out.close();
      System.out.println("create_table.docx written successully");
   }
}

Save the above code in a file named CreateTable.java. Compile and execute it from the command prompt as follows −

$javac CreateTable.java
$java CreateTable

It generates a Word file named createtable.docx in your current directory and display the following output on the command prompt −

createtable.docx written successfully

The createtable.docx file looks as follows −

Apache POI Word - Font & Alignment

This chapter shows how to apply different font styles and alignments in a Word document using Java. Generally, Font Style contains: Font size, Type, Bold, Italic, and Underline. And Alignment is categorized into left, center, right, and justify.

Font Style

The following code is used to set different styles of font −

import java.io.File;
import java.io.FileOutputStream;

import org.apache.poi.xwpf.usermodel.VerticalAlign;
import org.apache.poi.xwpf.usermodel.XWPFDocument;
import org.apache.poi.xwpf.usermodel.XWPFParagraph;
import org.apache.poi.xwpf.usermodel.XWPFRun;

public class FontStyle {

   public static void main(String[] args)throws Exception {

      //Blank Document
      XWPFDocument document = new XWPFDocument(); 
        
      //Write the Document in file system
      FileOutputStream out = new FileOutputStream(new File("fontstyle.docx"));
        
      //create paragraph
      XWPFParagraph paragraph = document.createParagraph();
        
      //Set Bold an Italic
      XWPFRun paragraphOneRunOne = paragraph.createRun();
      paragraphOneRunOne.setBold(true);
      paragraphOneRunOne.setItalic(true);
      paragraphOneRunOne.setText("Font Style");
      paragraphOneRunOne.addBreak();
        
      //Set text Position
      XWPFRun paragraphOneRunTwo = paragraph.createRun();
      paragraphOneRunTwo.setText("Font Style two");
      paragraphOneRunTwo.setTextPosition(100);
 
      //Set Strike through and Font Size and Subscript
      XWPFRun paragraphOneRunThree = paragraph.createRun();
      paragraphOneRunThree.setStrike(true);
      paragraphOneRunThree.setFontSize(20);
      paragraphOneRunThree.setSubscript(VerticalAlign.SUBSCRIPT);
      paragraphOneRunThree.setText(" Different Font Styles");
        
      document.write(out);
      out.close();
      System.out.println("fontstyle.docx written successully");
   }
}

Save the above code as FontStyle.java and then compile and execute it from the command prompt as follows −

$javac FontStyle.java
$java FontStyle

It will generate a Word file named fontstyle.docx in your current directory and display the following output on the command prompt −

fontstyle.docx written successfully

The fontstyle.docx file looks as follows.

Alignment

The following code is used to set alignment to the paragraph text −

import java.io.File;
import java.io.FileOutputStream;
import org.apache.poi.xwpf.usermodel.ParagraphAlignment;
import org.apache.poi.xwpf.usermodel.XWPFDocument;
import org.apache.poi.xwpf.usermodel.XWPFParagraph;
import org.apache.poi.xwpf.usermodel.XWPFRun;

public class AlignParagraph {

   public static void main(String[] args)throws Exception {

      //Blank Document
      XWPFDocument document = new XWPFDocument(); 
        
      //Write the Document in file system
      FileOutputStream out = new FileOutputStream(
      new File("alignparagraph.docx"));
        
      //create paragraph
      XWPFParagraph paragraph = document.createParagraph();
        
      //Set alignment paragraph to RIGHT
      paragraph.setAlignment(ParagraphAlignment.RIGHT);
      XWPFRun run = paragraph.createRun();
      run.setText("At howcodex.com, we strive hard to " +
         "provide quality tutorials for self-learning " +
         "purpose in the domains of Academics, Information " +
         "Technology, Management and Computer Programming " +
         "Languages.");
        
      //Create Another paragraph
      paragraph = document.createParagraph();
        
      //Set alignment paragraph to CENTER
      paragraph.setAlignment(ParagraphAlignment.CENTER);
      run = paragraph.createRun();
      run.setText("The endeavour started by Mohtashim, an AMU " +
         "alumni, who is the founder and the managing director " +
         "of Howcodex (I) Pvt. Ltd. He came up with the " +
         "website howcodex.com in year 2006 with the help" +
         "of handpicked freelancers, with an array of tutorials" +
         " for computer programming languages. ");
			
      document.write(out);
      out.close();
      System.out.println("alignparagraph.docx written successfully");
   }
}

Save the above code as AlignParagraph.java and then compile and execute it from the command prompt as follows −

$javac AlignParagraph.java
$java AlignParagraph

It will generate a Word file named alignparagraph.docx in your current directory and display the following output in the command prompt −

alignparagraph.docx written successfully

The alignparagraph.docx file looks as follows −

Apache POI Word - Text Extraction

This chapter explains how to extract simple text data from a Word document using Java. In case you want to extract metadata from a Word document, make use of Apache Tika.

For .docx files, we use the class org.apache.poi.xwpf.extractor.XPFFWordExtractor that extracts and returns simple data from a Word file. In the same way, we have different methodologies to extract headings, footnotes, table data, etc. from a Word file.

The following code shows how to extract simple text from a Word file −

import java.io.FileInputStream;
import org.apache.poi.xwpf.extractor.XWPFWordExtractor;
import org.apache.poi.xwpf.usermodel.XWPFDocument;

public class WordExtractor {

   public static void main(String[] args)throws Exception {

      XWPFDocument docx = new XWPFDocument(new FileInputStream("create_paragraph.docx"));
      
      //using XWPFWordExtractor Class
      XWPFWordExtractor we = new XWPFWordExtractor(docx);
      System.out.println(we.getText());
   }
}

Save the above code as WordExtractor.java. Compile and execute it from the command prompt as follows −

$javac WordExtractor.java
$java WordExtractor

It will generate the following output:

At howcodex.com, we strive hard to provide quality tutorials for self-learning
purpose in the domains of Academics, Information Technology, Management and Computer
Programming Languages.