java pdf 删除附件-凯发线上登陆下载网址

spire.pdf中有pdfattachment类和pdfattachmentannotation类分别对应pdf中的附件和注释附件。本文介绍如何使用spire.pdf for java获取pdf文档中的附件和注释附件并进行删除。

删除附件

import com.spire.pdf.attachments.pdfattachmentcollection;
public class deleteattachments {
    public static void main(string[] args) {
        //加载pdf文档
        pdfdocument doc = new pdfdocument();
        doc.loadfromfile("c:\\users\\administrator\\desktop\\attachments.pdf");
        //获取附件集合（不包含注释附件）
        pdfattachmentcollection attachments = doc.getattachments();
        //删除所有附件
        attachments.clear();
        //删除指定附件
        //attachments.removeat(0);
        //保存文档
        doc.savetofile("output/deleteattachments.pdf");
        doc.close();
    }
}

删除注释附件

import com.spire.pdf.annotations.pdfannotation;
import com.spire.pdf.annotations.pdfannotationcollection;
import com.spire.pdf.annotations.pdfattachmentannotationwidget;
public class deleteannotationattachments {
    public static void main(string[] args) {
        //加载pdf文档
        pdfdocument doc = new pdfdocument();
        doc.loadfromfile("c:\\users\\administrator\\desktop\\attachments.pdf");
        //遍历文档中的页
        for (int i = 0; i < doc.getpages().getcount(); i  ) {
            //获取注释集合
            pdfannotationcollection annotationcollection = doc.getpages().get(i).getannotationswidget();
            //遍历注释集合
            for (object annotation: annotationcollection) {
                //判断注释是否为pdfattachmentannotationwidget类型
                if (annotation instanceof pdfattachmentannotationwidget){
                    //删除注释附件
                    annotationcollection.remove((pdfannotation) annotation);
                }
            }
        }
        //保存文档
        doc.savetofile("output/deleteannotationattachments.pdf");
        doc.close();
    }
}