本文将介绍如何使用Spire.PDF 在java应用程序中为PDF文档添加弹出式附注和文本框注释。

新建PDF文档添加弹出式附注：

import com.spire.pdf.*;
import com.spire.pdf.annotations.*;
import com.spire.pdf.graphics.*;
import java.awt.*;
import java.awt.geom.*;

public class PDFAnnotation {
    public static void main(String[] args)  {
        //初始化PdfDocument实例
        PdfDocument doc = new PdfDocument();
        //设置边距
        PdfUnitConvertor unitCvtr = new PdfUnitConvertor();
        PdfMargins margin = new PdfMargins();
        margin.setTop(unitCvtr.convertUnits(2.54f, PdfGraphicsUnit.Centimeter, PdfGraphicsUnit.Point));
        margin.setBottom(margin.getTop());
        margin.setLeft(unitCvtr.convertUnits(3f, PdfGraphicsUnit.Centimeter, PdfGraphicsUnit.Point));
        margin.setRight(margin.getLeft());
        //添加新页
        PdfPageBase page = doc.getPages().add(PdfPageSize.A4, margin);

        //插入文本
        PdfBrush brush1 = PdfBrushes.getBlack();
        PdfTrueTypeFont font1 = new PdfTrueTypeFont(new Font("Arial Unicode MS",  Font.BOLD + Font.ITALIC,13), true);
        PdfStringFormat format1 = new PdfStringFormat(PdfTextAlignment.Left);
        float y = 50;
        String s = "Spire.PDF for Java 用于创建编辑PDF文档";
        page.getCanvas().drawString(s, font1, brush1, 0, y - 5, format1);
        y = y + (float)font1.measureString(s, format1).getHeight();

        //指定附注的文本、图标及图标颜色
        PdfTrueTypeFont font = new PdfTrueTypeFont(new Font("Arial Unicode MS",0, 10));
        PdfStringFormat format = new PdfStringFormat();
        format.setMeasureTrailingSpaces(true);
        String prompt = "弹出式注释";
        Dimension2D size = font.measureString(prompt, format);
        page.getCanvas().drawString(prompt, font, PdfBrushes.getDodgerBlue(), 0, y);
        float x = (float)size.getWidth();
        String label = "Spire.PDF for Java添加弹出式批注";
        page.getCanvas().drawString(label, font, PdfBrushes.getOrangeRed(), x, y);
        x = x + (float)font.measureString(label, format).getWidth();
        String markupText = "什么是Spire.PDF for Java";
        Rectangle2D rectangle2D = new Rectangle.Float();
        rectangle2D.setFrame(new Point2D.Double(x,y),new Dimension());
        PdfPopupAnnotation annotation = new PdfPopupAnnotation(rectangle2D, markupText);
        annotation.setIcon(PdfPopupIcon.Paragraph);
        annotation.setOpen(true);
        annotation.setColor(new PdfRGBColor(Color.YELLOW));
        ((PdfNewPage) page).getAnnotations().add(annotation);

        //保存文档
        doc.saveToFile("output/annotation.pdf");
        doc.close();
    }
}

效果图:

为已有PDF文档添加文本框注释:

import com.spire.pdf.*;
import com.spire.pdf.annotations.*;
import com.spire.pdf.graphics.*;
import java.awt.*;
import java.awt.geom.*;
import com.spire.pdf.general.find.PdfTextFind;
public class PDFAnnotation {
    public static void main(String[] args) {

        //加载示例文档
        PdfDocument doc = new PdfDocument();
        doc.loadFromFile("Sample.pdf");

        //获取第一页
        PdfPageBase page = doc.getPages().get(0);

        //获取文本
        PdfTextFind[] find = page.findText("主要功能").getFinds();

        //指定文本框注释的位置
        float x = (float) (find[0].getPosition().getX() - doc.getPageSettings().getMargins().getLeft() + find[0].getSize().getWidth() + 20);
        float y = (float) (find[0].getPosition().getY() - doc.getPageSettings().getMargins().getTop() + 20);

        //创建文本框注释
        Rectangle2D.Float rect = new Rectangle2D.Float(x, y, 120, 20);
        PdfFreeTextAnnotation textAnnotation = new PdfFreeTextAnnotation(rect);

        // 设置注释文字及字体，注释框边界颜色及背景色
        textAnnotation.setMarkupText("Spire.PDF 文本框注释");
        PdfTrueTypeFont font = new PdfTrueTypeFont(new Font("Arial Unicode MS", 0, 10));
        ;
        textAnnotation.setFont(font);
        PdfAnnotationBorder border = new PdfAnnotationBorder(0.5f);
        textAnnotation.setBorder(border);
        textAnnotation.setBorderColor(new PdfRGBColor(Color.pink));
        textAnnotation.setColor(new PdfRGBColor(Color.YELLOW));
        textAnnotation.setOpacity(0.75f);
        textAnnotation.setTextMarkupColor(new PdfRGBColor(Color.black));

        //添加注释到PDF
        page.getAnnotationsWidget().add(textAnnotation);

        //保存文档
        doc.saveToFile("output/FreeTextAnnotation.pdf");
        doc.close();
    }
}

效果图: