在前文中,我介绍过如何给PDF文档增加文本和图片水印。本文将具体解说如何增加、删除PPT文本和图片水印。
此次代码示例所用到的工具是Free Spire.Presentation for Java。Free Spire.Presentation for Java 是一个业余的PowerPoint API,它容许开发人员在Java应用程序中创立、读取、写入、转换和保留PowerPoint文档。同时,作为一款独立的Java组件,其运行环境无需装置Microsoft PowerPoint。
操作步骤:
通过官网下载获取Jar包,解压后将lib文件夹下的Spire.Presentation.jar手动导入Java程序。
另外,也可通过maven仓库装置产品及导入相干依赖包。具体装置详情参见此教程。
代码示例
示例1 增加图片水印
import com.spire.presentation.*;import com.spire.presentation.drawing.*;import javax.imageio.ImageIO;import java.io.File;public class AddImageWatermark { public static void main(String[] args) throws Exception { //加载示例文档 Presentation presentation = new Presentation(); presentation.loadFromFile("C:\\Users\\Test1\\Desktop\\Sample.pptx"); //获取水印图片 File file =new File("C:\\Users\\Test1\\Desktop\\logo.png"); IImageData image = presentation.getImages().append(ImageIO.read(file)); //获取幻灯片背景属性,设置图片填充 presentation.getSlides().get(0).getSlideBackground().setType(BackgroundType.CUSTOM); presentation.getSlides().get(0).getSlideBackground().getFill().setFillType(FillFormatType.PICTURE); presentation.getSlides().get(0).getSlideBackground().getFill().getPictureFill().setFillType(PictureFillType.STRETCH); presentation.getSlides().get(0).getSlideBackground().getFill().getPictureFill().getPicture().setEmbedImage(image); //保存文档 presentation.saveToFile("output/addImageWatermark.pptx", FileFormat.PPTX_2013); }}
增加成果:
示例2 增加文本水印
import com.spire.presentation.*;import com.spire.presentation.drawing.FillFormatType;import java.awt.*;import java.awt.geom.Rectangle2D;public class AddTextWatermark { public static void main(String[] args) throws Exception { //创立presentation对象并加载示例文档 Presentation presentation = new Presentation(); presentation.loadFromFile("C:\\Users\\Test1\\Desktop\\Sample.pptx"); //设置文本水印的宽和高 int width= 400; int height= 300; //定义一个长方形区域 Rectangle2D.Double rect = new Rectangle2D.Double((presentation.getSlideSize().getSize().getWidth() - width) / 2, (presentation.getSlideSize().getSize().getHeight() - height) / 2, width, height); //增加一个shape到定义区域 IAutoShape shape = presentation.getSlides().get(0).getShapes().appendShape(ShapeType.RECTANGLE, rect); //设置shape款式 shape.getFill().setFillType(FillFormatType.NONE); shape.getShapeStyle().getLineColor().setColor(Color.white); shape.setRotation(-45); shape.getLocking().setSelectionProtection(true); shape.getLine().setFillType(FillFormatType.NONE); //增加文本到shape shape.getTextFrame().setText("外部应用"); PortionEx textRange = shape.getTextFrame().getTextRange(); //设置文本水印款式 textRange.getFill().setFillType(FillFormatType.SOLID); textRange.getFill().getSolidColor().setColor(Color.pink); textRange.setFontHeight(50); //保存文档 presentation.saveToFile("output/addTextWatermark.pptx", FileFormat.PPTX_2010); }}
增加成果:
示例3 删除图片和文本水印
package Watermark;import com.spire.presentation.*;import com.spire.presentation.drawing.*;public class DeleteWatermark { public static void main(String[] args) throws Exception { //加载示例文档 Presentation presentation = new Presentation(); presentation.loadFromFile("C:\\Users\\Test1\\Desktop\\Sample.pptx"); //移除文本水印 for (int i = 0; i < presentation.getSlides().getCount(); i++) { for (int j = 0; j < presentation.getSlides().get(i).getShapes().getCount(); j++) { if (presentation.getSlides().get(i).getShapes().get(j) instanceof IAutoShape) { IAutoShape shape = (IAutoShape)presentation.getSlides().get(i).getShapes().get(j); if (shape.getTextFrame().getText().contains("外部应用")) { presentation.getSlides().get(i).getShapes().remove(shape); } } } } //移除图片水印 for (int i = 0; i < presentation.getSlides().getCount(); i++) { presentation.getSlides().get(i).getSlideBackground().getFill().setFillType(FillFormatType.NONE); } //保存文档 presentation.saveToFile("output/removeTextOrImageWatermark.pptx", FileFormat.PPTX_2013); }}
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