使用XStream跳过与List相关的标记

Question

我正在尝试使用XStream将类实例转换为XML.一切都很好,除了一件事,我希望有人能帮助我解决.

作为一个前提,我有许多"嵌套"类(按顺序,OrderStatusImport- > OrderCollection- > Order- > OrderLine),但焦点由类表示Order; 如上所述,它的每个实例都包含一个OrderLine对象列表.就像这样:

public class Order {
   //attribute's declarations...
   ArrayList<OrderLine> orderLines;
}

这是我的格式化程序类,我在其中调用主XStream逻辑:

private String createImportXml(OrderStatusImport orderStatusImport) {
    Object xstream = null;
    if (xstream == null) {
        xstream = new XStream() {
            @Override
            protected MapperWrapper wrapMapper(MapperWrapper next) {
                return new UpperCaseMapper(next);
            }
        };
    }

    ((XStream) xstream).alias("OrderStatusImport", OrderStatusImport.class);
    ((XStream) xstream).alias("OrderCollection", OrderCollection.class);
    ((XStream) xstream).alias("Order", Order.class);
    ((XStream) xstream).alias("OrderLine", OrderLine.class);
    ((XStream) xstream).omitField(Order.class, "OrderLines");

    String decl = "\n";
    String header = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>";
    String xml = "";

    xml += ((XStream) xstream).toXML(orderStatusImport);

    return (header + decl + xml + decl);
}

问题是生成的XML具有不需要的标记OrderLines.它表示为:

  <Order>
    <OrderItemsTotal>266.00</OrderItemsTotal>
    <OrderShipping>0.00</OrderShipping>
    <OrderCodFee>0.00</OrderCodFee>
    <OrderTotal>266.00</OrderTotal>
    <OrderStatus>H4</OrderStatus>
    <OrderLines>
      <OrderLine>
        <ItemNumber>000001</ItemNumber>
        <DCNumber>DC10</DCNumber>
        <StorageLocation>1001</StorageLocation>
        <OrderLineStatus>C0</OrderLineStatus>
        <CancelReasonCode></CancelReasonCode>
        <Quantity>1</Quantity>
        <ItemTotal>167.00</ItemTotal>
      </OrderLine>
      <OrderLine>
        <ItemNumber>000002</ItemNumber>
        <DCNumber>DC10</DCNumber>
        <StorageLocation>1001</StorageLocation>
        <OrderLineStatus>C0</OrderLineStatus>
        <CancelReasonCode></CancelReasonCode>
        <Quantity>1</Quantity>
        <ItemTotal>99.00</ItemTotal>
      </OrderLine>
    </OrderLines>
  </Order>

,虽然我想要这个(没有OrderLines标签):

  <Order>
    <OrderItemsTotal>266.00</OrderItemsTotal>
    <OrderShipping>0.00</OrderShipping>
    <OrderCodFee>0.00</OrderCodFee>
    <OrderTotal>266.00</OrderTotal>
    <OrderStatus>H4</OrderStatus>
    <OrderLine>
       <ItemNumber>000001</ItemNumber>
       <DCNumber>DC10</DCNumber>
       <StorageLocation>1001</StorageLocation>
       <OrderLineStatus>C0</OrderLineStatus>
       <CancelReasonCode></CancelReasonCode>
       <Quantity>1</Quantity>
       <ItemTotal>167.00</ItemTotal>
     </OrderLine>
     <OrderLine>
       <ItemNumber>000002</ItemNumber>
       <DCNumber>DC10</DCNumber>
       <StorageLocation>1001</StorageLocation>
       <OrderLineStatus>C0</OrderLineStatus>
       <CancelReasonCode></CancelReasonCode>
       <Quantity>1</Quantity>
       <ItemTotal>99.00</ItemTotal>
     </OrderLine>
  </Order>

我已经尝试了两个而omitField()不是@XStreamOmitField注释,但也许我误解了这些(我是XStream中的新手).在你提到之前,我也可以replace()在生成的String上使用一个简单的,但我不知道如何以这种方式保留缩进.

Answer 1

你想要什么称为隐式集合.您可以通过两种方式定义它

通过使用注释

public class Order {
   @XStreamImplicit(itemFieldName="OrderLine")
   ArrayList<OrderLine> orderLines;
}

或使用代码

xstream.addImplicitCollection(Order.class, "orderLines", "OrderLine", OrderLine.class);