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();
    }
}