Apache Camel没有可用的类型转换器

Question

我用camel定义了一个处理器，它允许我使用计时器生成一个jaxb-javabean，并将pojo写入xml文件。但当我启动应用程序时，我遇到了以下错误：

08:09:00 WARN[or.ap.ca.co.ti.时间消费者]（骆驼（骆驼-1）线程#2-定时器：//生成发票）错误处理交换。交换[20E715FDB7EFE19-0000000000000000]。由：[java.io.IOEx

我的代码如下：

from("timer:generateInvoice?period={{xml.timer.period}}&delay={{xml.timer.delay}}")
        .log("Generating randomized invoice XML data")
        .process("invoiceGenerator")
        .marshal(jaxbDataFormat)
        .to("file:{{xml.location}}");
            

发电机波纹管：

@Override
    public void process(Exchange exchange) throws Exception {

        Random random = new Random();
        List<Invoice> invoices = new LinkedList<>();

        for (int i = 0; i < 100; i++) {

            String invoiceNumber = String.format("invoice-%d", random.nextInt());

            Invoice invoice = new Invoice();
            invoice.setInvoiceNumber(invoiceNumber);
            invoice.setAmount(random.nextDouble());

            Instant now = Instant.now();

            GregorianCalendar cal1 = new GregorianCalendar();
            cal1.setTimeInMillis(now.toEpochMilli());
            invoice.setInsertionDate(DatatypeFactory.newInstance().newXMLGregorianCalendar());
            invoice.setInvoiceType(INVOICE_TYPE[random.nextInt(INVOICE_TYPE.length)]);
            invoices.add(invoice);
        }
        exchange.getMessage().setBody(invoices);
    }

我已经尝试将java.util.LinkedList的转换器实现为所需的类型：java.io.InputStream

跟：

@Converter
    public InputStream ListToInputStream(List<Invoice> invoices) throws IOException {

            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            ByteArrayInputStream bios = null;
            try {

                ObjectFactory objFactory = new ObjectFactory();

                JAXBContext jaxbContext = JAXBContext.newInstance("com.webinage.model");
                Marshaller marshaller = jaxbContext.createMarshaller();
                marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE);

                for(Invoice invoice : invoices) {
                    marshaller.marshal(invoice, baos);
                }
                bios = new ByteArrayInputStream(new byte[baos.size()]);
                bios.read(baos.toByteArray());
            } catch (Exception e) {
                e.printStackTrace();
            } finally {
                baos.close();
            }
            return bios;
    }

但是同样的例外出现了…你有什么想法吗？

Answer 1

很可能列表不是您想要放入交易所的内容。我假设您希望输出 XML 如下所示：

<Invoices>
 <Invoice>...</Invoice>
 <Invoice>...</Invoice>
 ...
</Invoices>

在这种情况下，声明一个容器类可能是最简单的：

@XmlRootElement
public class Invoices {
  private List<Invoice> invoices;
}

(省略getter和setter)。

然后生成您的模式，并将这个< code>Invoices对象放入交换中。