spring删除pdf最后一页
时间: 2023-06-01 15:04:38 浏览: 68
可以使用Apache PDFBox库来删除PDF文档的最后一页。以下是示例代码:
```
import java.io.File;
import java.io.IOException;
import org.apache.pdfbox.cos.COSArray;
import org.apache.pdfbox.cos.COSBase;
import org.apache.pdfbox.cos.COSDictionary;
import org.apache.pdfbox.cos.COSName;
import org.apache.pdfbox.cos.COSObject;
import org.apache.pdfbox.cos.COSStream;
import org.apache.pdfbox.pdfparser.PDFParser;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.pdmodel.PDPageTree;
import org.apache.pdfbox.pdmodel.common.PDStream;
public class DeleteLastPage {
public static void main(String[] args) {
try {
// Load the PDF document
PDDocument document = PDDocument.load(new File("input.pdf"));
// Get the page tree
PDPageTree pages = document.getPages();
// Get the last page
PDPage lastPage = pages.get(pages.getCount() - 1);
// Remove the last page from the page tree
pages.remove(lastPage);
// Remove the last page object from the document catalog
COSObject pageObject = lastPage.getCOSObject();
COSDictionary catalog = document.getDocumentCatalog().getCOSObject();
COSArray kids = (COSArray) catalog.getDictionaryObject(COSName.PAGES).getDictionaryObject(COSName.KIDS);
kids.removeObject(pageObject);
// Remove the last page stream from the document
COSBase contents = lastPage.getCOSObject().getDictionaryObject(COSName.CONTENTS);
if (contents instanceof COSStream) {
document.getDocument().getObjects().remove(contents);
}
// Save the modified document
document.save(new File("output.pdf"));
// Close the document
document.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
```
在上面的代码中,我们首先加载了PDF文档,然后获取了页面树。接下来,我们获取了最后一页,并从页面树中删除了它。然后,我们从文档目录中删除了最后一页对象,并从文档中删除了最后一页流。最后,我们保存了修改后的文档,并关闭了它。