本文介绍如何使用Spire.PDF for Java添加普通链接、超文本链接、邮箱链接和文档链接到PDF文档。

import com.spire.pdf.annotations.*;
import com.spire.pdf.graphics.*;

import java.awt.*;
import java.awt.font.TextAttribute;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
import java.util.HashMap;

public class AddLinksToPdf {

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

        //创建PDF文档
        PdfDocument doc = new PdfDocument();
        PdfPageBase page = doc.getPages().add();

        //初始化X,Y坐标
        float y = 30;
        float x = 0;

        // 创建一个普通字体
        PdfTrueTypeFont plainFont = new PdfTrueTypeFont(new Font("宋体",Font.PLAIN,13),true);

        //创建一个带下划线的字体
        HashMap<TextAttribute, Object> hm = new HashMap<TextAttribute, Object>();
        hm.put(TextAttribute.UNDERLINE, TextAttribute.UNDERLINE_ON);
        hm.put(TextAttribute.SIZE, 13);
        hm.put(TextAttribute.FAMILY, "Arial");
        Font font = new Font(hm);
        PdfTrueTypeFont underlineFont = new PdfTrueTypeFont(font,true);

        //添加简单链接到PDF
        String label = "简单链接： ";
        PdfStringFormat format = new PdfStringFormat();
        format.setMeasureTrailingSpaces(true);
        page.getCanvas().drawString(label, plainFont, PdfBrushes.getOrange(), 0, y,format);
        x = (float)plainFont.measureString(label,format).getWidth();
        page.getCanvas().drawString("https://www.e-iceblue.com", underlineFont, PdfBrushes.getBlue(), x, y+2);
        y = y + 26;

        //添加超文本链接到PDF 
        label= "超文本链接： ";
        page.getCanvas().drawString(label, plainFont, PdfBrushes.getOrange(), 0, y, format);
        x = (float)plainFont.measureString(label,format).getWidth();
        PdfTextWebLink webLink = new PdfTextWebLink();
        webLink.setText("主页");
        webLink.setUrl("https://www.e-iceblue.com");
        webLink.setFont(plainFont);
        webLink.setBrush(PdfBrushes.getBlue());
        webLink.drawTextWebLink(page.getCanvas(), new Point2D.Float(x, y));
        y= y + 26;

        //添加邮箱链接到PDF 
        label = "邮箱链接：  ";
        page.getCanvas().drawString(label, plainFont, PdfBrushes.getOrange(), 0, y, format);
        x = (float)plainFont.measureString(label, format).getWidth();
        webLink = new PdfTextWebLink();
        webLink.setText("联系我们");
        webLink.setUrl("mailto:support@ e-iceblue.com");
        webLink.setFont(plainFont);
        webLink.setBrush(PdfBrushes.getBlue());
        webLink.drawTextWebLink(page.getCanvas(), new Point2D.Float(x, y));
        y = y + 26;

        //添加文档链接到PDF 
        label = "文档链接： ";
        page.getCanvas().drawString(label, plainFont, PdfBrushes.getOrange(), 0, y, format);
        x = (float)plainFont.measureString(label, format).getWidth();
        page.getCanvas().drawString("打开文件", plainFont, PdfBrushes.getBlue(), x, y, format);
        Rectangle2D rect = new Rectangle2D.Float(x,y+2,60,15);
        PdfFileLinkAnnotation fileLinkAnnotation = new PdfFileLinkAnnotation(rect,"C:\\Users\\Administrator\\Desktop\\Image.png");
        fileLinkAnnotation.setBorder(new PdfAnnotationBorder(0f));
        ((PdfNewPage) ((page instanceof PdfNewPage) ? page : null)).getAnnotations().add(fileLinkAnnotation);

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