本文介绍如何使用Spire.Presentation for Java更改PowerPoint中文本的字体样式，包括字体名称，字体大小，字体颜色，粗体，斜体等。

import com.spire.presentation.*;
import com.spire.presentation.drawing.FillFormatType;

import java.awt.*;

public class ChangeFontStyles {

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

        //创建Presentation对象
        Presentation presentation = new Presentation();

        //加载示例文档
        presentation.loadFromFile("C:\\Users\\Administrator\\Desktop\\sample.pptx");

        //获取文本形状
        IAutoShape shape = (IAutoShape) presentation.getSlides().get(0).getShapes().get(0);

        //获取第一个段落并更改字体颜色
        ParagraphEx paragraph = shape.getTextFrame().getParagraphs().get(0);
        for (int i = 0; i < paragraph.getTextRanges().getCount(); i++) {
            PortionEx textRange =  paragraph.getTextRanges().get(i);
            textRange.getFormat().getFill().setFillType(FillFormatType.SOLID);
            textRange.getFormat().getFill().getSolidColor().setColor(Color.blue);
        }

        //获取第三个段落并将文字加粗，设置斜体和下划线
        paragraph = shape.getTextFrame().getParagraphs().get(2);
        for (int i = 0; i < paragraph.getTextRanges().getCount(); i++) {
            PortionEx textRange = paragraph.getTextRanges().get(i);
            textRange.getFormat().isBold(TriState.TRUE);
            textRange.getFormat().isItalic(TriState.TRUE);
            textRange.getFormat().setTextUnderlineType(TextUnderlineType.DASHED);
        }

        //获取第五个段落并更改字体名称及大小
        paragraph = shape.getTextFrame().getParagraphs().get(4);
        for (int i = 0; i < paragraph.getTextRanges().getCount(); i++) {
            PortionEx textRange = paragraph.getTextRanges().get(i);
            textRange.getFormat().setEastAsianFont(new TextFont("黑体"));
            textRange.getFormat().setFontHeight(22f);
        }

        //保存文档
        presentation.saveToFile("output/ChangeFontStyles.pptx", FileFormat.PPTX_2013);
    }
}