Java - Change Font Styles in a Word Document

When you receive a Word document, you may want to modify the font styles of the specific paragraphs in order to achieve a standardized or aesthetic requirement. In this article, I am going to introduce how to programmatically change font name, font size, font color and font style (bold, italic) by using Spire.Doc for Java.

Installing Spire.Doc.jar

If you create a Maven project, you can easily import the jar in your application using the following configurations. For non-Maven projects, download the jar file from this link and add it as a dependency in your application.

<repositories>
    <repository>
        <id>com.e-iceblue</id>
        <name>e-iceblue</name>
        <url>http://repo.e-iceblue.com/nexus/content/groups/public/</url>
    </repository>
</repositories>
<dependencies>
    <dependency>
        <groupId> e-iceblue</groupId>
        <artifactId>spire.doc</artifactId>
        <version>4.6.2</version>
    </dependency>
</dependencies>

Using the code

import com.spire.doc.Document;
import com.spire.doc.FileFormat;
import com.spire.doc.Section;
import com.spire.doc.documents.Paragraph;
import com.spire.doc.fields.TextRange;

import java.awt.*;

public class ChangeFontStyles {

    public static void main(String[] args) {

        //Create a Document instance
        Document doc = new Document();

        //Load the Word document
        doc.loadFromFile("C:\\Users\\Administrator\\Desktop\\sample.docx");

        //Get the first section and second paragraph
        Section section = doc.getSections().get(0);

        //Get the first paragraph
        Paragraph paragraphOne = section.getParagraphs().get(0);

        //Iterate through the childObjects of the first paragraph
        for (int i = 0; i < paragraphOne.getChildObjects().getCount(); i ++)
        {
            //Change font color of the text
            if ( paragraphOne.getChildObjects().get(i) instanceof TextRange)
            {
                TextRange tr = (TextRange) paragraphOne.getChildObjects().get(i);
                tr.getCharacterFormat().setTextColor(Color.green);
            }
        }

        //Get the second paragraph
        Paragraph paragraphTwo = section.getParagraphs().get(1);

        //Iterate through the childObjects of the second paragraph
        for (int i = 0; i < paragraphTwo.getChildObjects().getCount(); i ++)
        {
            //Change font size of the text
            if ( paragraphOne.getChildObjects().get(i) instanceof TextRange)
            {
                TextRange tr = (TextRange) paragraphTwo.getChildObjects().get(i);
                tr.getCharacterFormat().setFontSize(16f);
            }
        }

        //Get the third paragraph
        Paragraph paragraphThree= section.getParagraphs().get(2);

        //Iterate through the childObjects of the third paragraph
        for (int i = 0; i < paragraphThree.getChildObjects().getCount(); i ++)
        {
            //Change the font name and make the text bold & italic
            if ( paragraphOne.getChildObjects().get(i) instanceof TextRange)
            {
                TextRange tr = (TextRange) paragraphThree.getChildObjects().get(i);
                tr.getCharacterFormat().setFontName("Times New Roman");
                tr.getCharacterFormat().setBold(true);
                tr.getCharacterFormat().setItalic(true);
            }
        }

        //Save the document
        doc.saveToFile("output/ChangeFontStyles.docx", FileFormat.Docx_2013);
    }
}

Output