无法使用Apache Camel Bindy向文件添加页眉和页脚

from("file:/path/to/input?noop=true")
    .process(new Processor() {
        public void process(Exchange exchange) throws Exception {
            // 读取页眉和页脚的内容
            HeaderFooter headerFooter = new HeaderFooter();
            String header = headerFooter.getHeader();
            String footer = headerFooter.getFooter();

            // 读取文件内容
            String fileContent = exchange.getIn().getBody(String.class);

            // 添加页眉和页脚
            String contentWithHeaderFooter = header + fileContent + footer;

            // 更新文件内容
            exchange.getIn().setBody(contentWithHeaderFooter);
        }
    })
    .unmarshal().bindy(BindyType.Csv, MyModel.class)
    .to("file:/path/to/output");