JAXB到達嵌套XmlElement示例

Question

這是我的XmlRoot類：

  @XmlRootElement(name = "IGE") @XmlAccessorType(XmlAccessType.FIELD) @XmlType(name = "IGEType", propOrder = { "altin" }) public class IGEType { @XmlElement(name = "ALTIN", required = true) protected List<ALTINType> altin; public List<ALTINType> getALTIN() { if (altin == null) { altin = new ArrayList<ALTINType>(); } return this.altin; } } 

然后是root的后繼（子）類：

 @XmlAccessorType(XmlAccessType.FIELD) @XmlType(name = "ALTINType", propOrder = { "seanSytl" }) public class ALTINType { @XmlElement(name = "SEANSytl", required = true) protected SEANSytlType seanSytl; } 

最后，root的繼承者的繼承者類：

 @XmlAccessorType(XmlAccessType.FIELD) @XmlType(name = "SEANSytlType", propOrder = { "birim", "oncekiKapanis", "enDusuk", "enYuksek", "kapanis", "agirlikliOrtalama", "islemHacmi", "islemMiktari", "bicim", "gram", "islemSayisi" }) public class SEANSytlType { @XmlElement(required = true) protected String birim; @XmlElement(name = "onceki_kapanis", required = true) protected BigDecimal oncekiKapanis; @XmlElement(name = "en_dusuk", required = true) protected BigDecimal enDusuk; @XmlElement(name = "en_yuksek", required = true) protected BigDecimal enYuksek; @XmlElement(required = true) protected BigDecimal kapanis; @XmlElement(name = "agirlikli_ortalama", required = true) protected BigDecimal agirlikliOrtalama; @XmlElement(name = "islem_hacmi", required = true) protected BigDecimal islemHacmi; @XmlElement(name = "islem_miktari", required = true) protected BigDecimal islemMiktari; @XmlElement(name = "BICIM", required = true) protected BigDecimal bicim; @XmlElement(name = "GRAM", required = true) protected BigDecimal gram; @XmlElement(name = "islem_sayisi") protected int islemSayisi; } 

Myhandler類：

 @Override public void handleXMLtoIABData(RequestTcmbXMLData req) throws HmnServiceException { try { JAXBContext jaxbContext = JAXBContext.newInstance(IGEType.class); Unmarshaller jaxbUnmarshaller = jaxbContext.createUnmarshaller(); File XMLfile = new File("C:\\\\Users\\\\U067944\\\\Desktop\\\\IAB_bülten.xml"); IGEType igeRoot = (IGEType) jaxbUnmarshaller.unmarshal(XMLfile); **List<SEANSytlType> listofAltinYtl = (List<SEANSytlType>) ((List<ALTINType>) igeRoot.getALTIN()).getSEANSytl();** for (SEANSytlType altinYtl : listofAltinYtl) { } } catch (JAXBException e) { e.printStackTrace(); } } 

在我的處理程序類中，我嘗試到達最后一個后繼類（列表SEANSytlType），但是它不起作用。 我收到此錯誤：

jvmId：[300]，transactionId：[3005624292568000]。根本原因：[java.lang.ClassCastException：java.util.ArrayList無法轉換為com.ykb.hmn.mdt.marketdata.xmlparser.iab.ALTINType]

我也嘗試在處理程序，但相同的：

IGEType igeRoot = (IGEType) jaxbUnmarshaller.unmarshal(XMLfile);

            String inputDate = igeRoot.getIGEBULTENGUNTR().getGun2();
             List<ALTINType> listAltinRoot = (List<ALTINType>) igeRoot.getALTIN();
             List<SEANSytlType> listofAltinYtl = (List<SEANSytlType>) listAltinRoot.get(0);

我哪里錯了？ 提前致謝！

Answer 1

基於您的樣本類IGEType

@XmlRootElement(name = "IGE")
@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "IGE", propOrder = { "altin" })
public class IGEType {


    @XmlElement(name = "Altin", required = true)
    public List<ALTINType> altin;

    public List<ALTINType> getALTIN() {
        if (altin == null) {
            altin = new ArrayList<ALTINType>();
        }
        return this.altin;
    }
}

然后ALTINType

@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "altin", propOrder = { "seanSytl" })
public class ALTINType {

    @XmlElement(name = "SEANSytl", required = true)
    protected SEANSytlType seanSytl;

}

然后是SEANSytlType

<!-- language: java -->      
@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "SEANSytl", propOrder = { "birim"})
public class SEANSytlType {

    @XmlElement(required = true)
    protected String birim;
}

然后進行樣品測試

 <!-- language: java --> 
 public static void main(String[] args) {
    // TODO Auto-generated method stub
    try {
        JAXBContext jaxbContext = JAXBContext.newInstance(IGEType.class);

        Unmarshaller jaxbUnmarshaller = jaxbContext.createUnmarshaller();
        File XMLfile = new File("sample1.xml");
        IGEType igeRoot = (IGEType) jaxbUnmarshaller.unmarshal(XMLfile);

        List<ALTINType> listAltinRoot = igeRoot.getALTIN();

        // here you ll be have error ///
//            List<SEANSytlType> listofAltinYtl =  (List<SEANSytlType>)      listAltinRoot.get(0);
//
//            for (SEANSytlType altinYtl : listofAltinYtl) {
//              System.out.println(altinYtl.birim);
//            }

    } catch (JAXBException e) {

        e.printStackTrace();
    }
}

因此，並結束示例xml

<?xml version="1.0" encoding="UTF-8"?>
<IGE>
    <Altin>
        <SEANSytl>
            <birim>cccc</birim>
        </SEANSytl>
    </Altin>
    <Altin>
            <SEANSytl>
            <birim>dddd</birim>
        </SEANSytl>
    </Altin>

</IGE>

所以基本上的問題是，您在根（IGE）子列表中有altin，但在altin對象中，只有1個子對象seansylt不在列表中，就像您在altin中一樣，因此修復altin對象在此添加列表並看一下我的示例