问简单xml返回属性字段的空值
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Stack Overflow用户

提问于 2019-03-26 11:26:10

回答 2查看 248关注 0票数 0

我想使用简单的XML将以下XML反序列化为POJO：

<shippingInfo>
   <shippingServiceCost currencyId="USD">9.8</shippingServiceCost>
   <shippingType>Flat</shippingType>
   <shipToLocations>Worldwide</shipToLocations>
   <expeditedShipping>true</expeditedShipping>
   <oneDayShippingAvailable>false</oneDayShippingAvailable>
   <handlingTime>3</handlingTime>
</shippingInfo>

为此，我创建了以下类。但是，我遇到了问题，因为currencyId属性没有被正确地反序列化。

@Root(name = "shippingInfo")
public class ShippingInfo {

    @Element(name = "shippingServiceCost", required = false)
    private BigDecimal shippingServiceCost;

    @Attribute(name = "currencyId", required = false)
    private String currencyId;

    @Element(name = "shippingType", required = false)
    private String shippingType;

    @Element(name = "shipToLocations" ,required = false)
    private String shipToLocations;

    @Element(name = "expeditedShipping", required = false)
    private Boolean expeditedShipping;

    @Element(name = "oneDayShippingAvailable", required = false)
    private Boolean oneDayShippingAvailable;

    @Element(name = "handlingTime", required = false)
    private Integer handlingTime;

    // Getters & Setters

    public BigDecimal getShippingServiceCost() {
        return shippingServiceCost;
    }

    public void setShippingServiceCost(BigDecimal shippingServiceCost) {
        this.shippingServiceCost = shippingServiceCost;
    }

    public String getCurrencyId() {
        return currencyId;
    }

    public void setCurrencyId(String currencyId) {
        this.currencyId = currencyId;
    }

    public String getShippingType() {
        return shippingType;
    }

    public void setShippingType(String shippingType) {
        this.shippingType = shippingType;
    }

    public String getShipToLocations() {
        return shipToLocations;
    }

    public void setShipToLocations(String shipToLocations) {
        this.shipToLocations = shipToLocations;
    }

    public Boolean isExpeditedShipping() {
        return expeditedShipping;
    }

    public void setExpeditedShipping(Boolean bool) {
        this.expeditedShipping = bool;
    }

    public Boolean isOneDayShippingAvailable() {
        return oneDayShippingAvailable;
    }

    public void setOneDayShippingAvailable(Boolean bool) {
        this.oneDayShippingAvailable = bool;
    }

    public Integer getHandlingTime() {
        return handlingTime;
    }

    public void setHandlingTime(Integer days) {
        this.handlingTime = days;
    }
}

我期望在反序列化后currencyId的值是"USD“，但是我得到的结果是空的。所有元素值似乎都可以正确反序列化。有没有人有关于如何解决这个问题的建议？

此外，在下面这样的情况下：

<sellingStatus>
    <currentPrice currencyId="USD">125.0</currentPrice>
    <convertedCurrentPrice currencyId="USD">125.0</convertedCurrentPrice>
    <bidCount>2</bidCount>
    <sellingState>EndedWithSales</sellingState>
</sellingStatus>

在两个不同的元素上有两个名为currencyId的属性，我该如何将它们反序列化为单独的字段？我已经创建了一个类似的SellingStatus类，但是不确定如何区分currencyId属性。

谢谢!

编辑:根据建议，我尝试向ShippingInfo添加一个自定义ShippingServiceCost类，如下所示：

@Element(name = "shippingServiceCost", required = false)
    private ShippingServiceCost shippingServiceCost;

它依次看起来像这样：

public class ShippingServiceCost {

    @Element(name = "shippingServiceCost", required = false)
    private BigDecimal shippingServiceCost;

    @Attribute(name = "currencyId", required = false)
    private String currencyId;

    // getters and setters
}

但是，当我尝试访问shippingServiceCost字段和currencyId字段时，我在每个实例中都得到null (即使我知道有数据)。我们非常感谢您的任何建议。

java

xml

simple-framework

回答 2

Stack Overflow用户

发布于 2019-03-26 12:04:45

对于上面的代码，SimpleXML希望currencyId以<shippingInfo currencyId="USD">的形式出现。

因此，要解决这个问题，您需要创建另一个名为ShippingServiceCost的类，该类将包含currencyId属性和BigDecimal。这也将解决您的第二个查询。可以通过创建包含currencyId属性的两个类CurrentPrice和ConvertedCurrentPrice来实现。

票数 0

Stack Overflow用户

发布于 2020-10-17 22:35:49

唯一可行的解决方案是创建Converter类，请参阅下面的代码：

public class ShippingInfoConverter implements Converter<ShippingInfo> {

@Override
public ShippingInfo read(InputNode inputNode) throws Exception {
    ShippingInfo shippingInfo = new ShippingInfo();
    InputNode shippingServiceCostNode = inputNode.getNext("shippingServiceCost");
    shippingInfo.setShippingServiceCost(new BigDecimal(shippingServiceCostNode.getValue()));
    shippingInfo.setCurrencyId(shippingServiceCostNode.getAttribute("currencyId").getValue());
    shippingInfo.setShippingType(inputNode.getNext("shippingType").getValue());
    shippingInfo.setShipToLocations(inputNode.getNext("shipToLocations").getValue());
    shippingInfo.setExpeditedShipping(Boolean.parseBoolean(inputNode.getNext("expeditedShipping").getValue()));
    shippingInfo.setOneDayShippingAvailable(Boolean.parseBoolean(inputNode.getNext("oneDayShippingAvailable").getValue()));
    shippingInfo.setHandlingTime(Integer.valueOf(inputNode.getNext("handlingTime").getValue()));
    return shippingInfo;
}

@Override
public void write(OutputNode outputNode, ShippingInfo shippingInfo) throws Exception {
    OutputNode shippingServiceCostNode = outputNode.getChild("shippingServiceCost");
    shippingServiceCostNode.setValue(shippingInfo.getShippingServiceCost().toString());
    shippingServiceCostNode.setAttribute("currencyId", shippingInfo.getCurrencyId());
    outputNode.getChild("shippingType").setValue(shippingInfo.getShippingType());
    outputNode.getChild("shipToLocations").setValue(shippingInfo.getShipToLocations());
    outputNode.getChild("expeditedShipping").setValue(Boolean.toString(shippingInfo.isExpeditedShipping()));
    outputNode.getChild("oneDayShippingAvailable").setValue(Boolean.toString(shippingInfo.isOneDayShippingAvailable()));
    outputNode.getChild("handlingTime").setValue(Integer.toString(shippingInfo.getHandlingTime()));
}

}

注意'currencyId‘是如何使用节点的getAttribute方法设置的。

shippingInfo.setCurrencyId(shippingServiceCostNode.getAttribute("currencyId").getValue());

还要注意元素'shippingServiceCost‘是如何获取属性的

shippingServiceCostNode.setAttribute("currencyId", shippingInfo.getCurrencyId());

要让它正常工作，还需要做一些其他事情，首先是您的POJO

@Root(name = "shippingInfo")
@Convert(ShippingInfoConverter.class)
public class ShippingInfo {

    @Element(name = "shippingServiceCost", required = false)
    private BigDecimal shippingServiceCost;

    private String currencyId;

    @Element(name = "shippingType", required = false)
    private String shippingType;

    @Element(name = "shipToLocations" ,required = false)
    private String shipToLocations;

    @Element(name = "expeditedShipping", required = false)
    private Boolean expeditedShipping;

    @Element(name = "oneDayShippingAvailable", required = false)
    private Boolean oneDayShippingAvailable;

    @Element(name = "handlingTime", required = false)
    private Integer handlingTime;

    // Getters & Setters

    public BigDecimal getShippingServiceCost() {
        return shippingServiceCost;
    }

    public void setShippingServiceCost(BigDecimal shippingServiceCost) {
        this.shippingServiceCost = shippingServiceCost;
    }

    public String getCurrencyId() {
        return currencyId;
    }

    public void setCurrencyId(String currencyId) {
        this.currencyId = currencyId;
    }

    public String getShippingType() {
        return shippingType;
    }

    public void setShippingType(String shippingType) {
        this.shippingType = shippingType;
    }

    public String getShipToLocations() {
        return shipToLocations;
    }

    public void setShipToLocations(String shipToLocations) {
        this.shipToLocations = shipToLocations;
    }

    public Boolean isExpeditedShipping() {
        return expeditedShipping;
    }

    public void setExpeditedShipping(Boolean bool) {
        this.expeditedShipping = bool;
    }

    public Boolean isOneDayShippingAvailable() {
        return oneDayShippingAvailable;
    }

    public void setOneDayShippingAvailable(Boolean bool) {
        this.oneDayShippingAvailable = bool;
    }

    public Integer getHandlingTime() {
        return handlingTime;
    }

    public void setHandlingTime(Integer days) {
        this.handlingTime = days;
    }

}

添加下面的行将SimpleXML指向转换器类

@Convert(ShippingInfoConverter.class)

另一个更改是删除@Attribute注释。最后需要做的一件事是，在序列化和反序列化对象时，您的驱动程序类需要启用AnnotationStrategy。

Serializer serializer = new Persister(new AnnotationStrategy());

票数 0

页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持

原文链接：

https://stackoverflow.com/questions/55349422

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