如何在onEndPage() itext方法中传递自定义对象？

// 自定义对象
public class CustomObject {
    private String data;

    public CustomObject(String data) {
        this.data = data;
    }

    public String getData() {
        return data;
    }
}

// iText文档生成过程
public class PdfGenerator {
    private CustomObject customObject;

    public PdfGenerator() {
        customObject = new CustomObject("自定义数据");
    }

    public void generatePdf() {
        // 创建文档并添加内容
        Document document = new Document();
        // ...

        // 设置页结束事件
        PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream("output.pdf"));
        writer.setPageEvent(new PdfPageEventHelper() {
            @Override
            public void onEndPage(PdfWriter writer, Document document) {
                // 在onEndPage()方法中传递自定义对象
                CustomObject obj = PdfGenerator.this.customObject;
                // 调用自定义对象的方法获取数据
                String data = obj.getData();
                // 处理数据
                // ...
            }
        });

        // 关闭文档
        document.close();
    }
}