java 添加附件到 pdf-ag凯发旗舰厅

附件是附加在pdf文档中用于展示关联信息的文件。pdf中的附件有两种存在方式，一种是普通的文件附件，一种是注释。本文将展示如何使用spire.pdf for java添加这两种附件到pdf文档。

import com.spire.pdf.annotations.*;
import com.spire.pdf.attachments.pdfattachment;
import com.spire.pdf.graphics.*;
import java.awt.*;
import java.awt.geom.dimension2d;
import java.awt.geom.rectangle2d;
import java.io.file;
import java.io.fileinputstream;
import java.io.ioexception;
public class attachfiles {
    public static void main(string[] args) throws ioexception {
        //创建pdfdocument对象
        pdfdocument doc = new pdfdocument();
        //加载pdf文档
        doc.loadfromfile("c:\\users\\administrator\\desktop\\sample.pdf");
        //添加附件到pdf
        pdfattachment attachment = new pdfattachment("c:\\users\\administrator\\desktop\\使用说明书.docx");
        doc.getattachments().add(attachment);
        //绘制标签
        string label = "财务报表.xlsx";
        pdftruetypefont font = new pdftruetypefont(new font("arial unicode ms",font.plain,12),true);
        double x = 35;
        double y = doc.getpages().get(0).getactualsize().getheight() - 200;
        doc.getpages().get(0).getcanvas().drawstring(label, font, pdfbrushes.getorange(), x, y);
        //添加注释附件到pdf
        string filepath = "c:\\users\\administrator\\desktop\\财务报表.xlsx";
        byte[] data = tobytearray(filepath);
        dimension2d size = font.measurestring(label);
        rectangle2d bound = new rectangle2d.float((float) (x   size.getwidth()   2), (float) y, 10, 15);
        pdfattachmentannotation annotation = new pdfattachmentannotation(bound, filepath, data);
        annotation.setcolor(new pdfrgbcolor(new color(0, 128, 128)));
        annotation.setflags(pdfannotationflags.default);
        annotation.seticon(pdfattachmenticon.graph);
        annotation.settext("点击打开财务报表.xlsx");
        doc.getpages().get(0).getannotationswidget().add(annotation);
        //保存文档
        doc.savetofile("attachments.pdf");
    }
    //读取文件到byte数组
    public static byte[] tobytearray(string filepath) throws ioexception {
        file file = new file(filepath);
        long filesize = file.length();
        if (filesize > integer.max_value) {
            system.out.println("file too big...");
            return null;
        }
        fileinputstream fi = new fileinputstream(file);
        byte[] buffer = new byte[(int) filesize];
        int offset = 0;
        int numread = 0;
        while (offset < buffer.length
                && (numread = fi.read(buffer, offset, buffer.length - offset)) >= 0) {
            offset  = numread;
        }
        if (offset != buffer.length) {
            throw new ioexception("could not completely read file "
                      file.getname());
        }
        fi.close();
        return buffer;
    }
}