JAXB - unmarshalled字段为null

Posted 2021-04-06

我们正在解密http://xmlgw.companieshouse.gov.uk/的回复。这是发送给马歇尔的文字：

<NameSearch xmlns="http://xmlgw.companieshouse.gov.uk/v1-0/schema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlgw.companieshouse.gov.uk/v1-0/schema http://xmlgw.companieshouse.gov.uk/v1-0/schema/NameSearch.xsd">
  <ContinuationKey>...</ContinuationKey>
  <RegressionKey>...</RegressionKey>
  <SearchRows>20</SearchRows>
  <CoSearchItem>
    <CompanyName>COMPANY NAME</CompanyName>
    <CompanyNumber>23546457</CompanyNumber>
    <DataSet>LIVE</DataSet>
    <CompanyIndexStatus>DISSOLVED</CompanyIndexStatus>
    <CompanyDate></CompanyDate>
  </CoSearchItem>
  // more CoSearchItem elements
</NameSearch>

CoSearchItem的模型是这样的：

@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "CoSearchItem", propOrder = {
    "companyName",
    "companyNumber",
    "dataSet",
    "companyIndexStatus",
    "companyDate",
    "searchMatch"
})
public class CoSearchItem {

    @XmlElement(name = "CompanyName", required = true)
    protected String companyName;
    @XmlElement(name = "CompanyNumber", required = true)
    protected String companyNumber;
    @XmlElement(name = "DataSet", required = true)
    protected String dataSet;
    @XmlElement(name = "CompanyIndexStatus")
    protected String companyIndexStatus;
    @XmlElement(name = "CompanyDate")
    @XmlSchemaType(name = "date")
    protected XMLGregorianCalendar companyDate;
    @XmlElement(name = "SearchMatch")
    protected String searchMatch;

    // getters and setters

}

NameSearch模型具有以下结构：

@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "NameSearch", namespace = "http://xmlgw.companieshouse.gov.uk/v1-0/schema", propOrder = {
    "continuationKey",
    "regressionKey",
    "searchRows",
    "coSearchItem"
})
@XmlRootElement(name = "NameSearch", namespace = "http://xmlgw.companieshouse.gov.uk/v1-0/schema")
public class NameSearch {

    @XmlElement(name = "ContinuationKey", required = true)
    protected String continuationKey;
    @XmlElement(name = "RegressionKey", required = true)
    protected String regressionKey;
    @XmlElement(name = "SearchRows", required = true)
    protected BigInteger searchRows;
    @XmlElement(name = "CoSearchItem")
    protected List<CoSearchItem> coSearchItem;

    // setters and getters

}

包有这个注释：

@XmlSchema(namespace = "http://xmlgw.companieshouse.gov.uk/v1-0", elementFormDefault = XmlNsForm.QUALIFIED, //
    xmlns = {
        @XmlNs(prefix = "xsi", namespaceURI = "http://www.w3.org/2001/XMLSchema-instance") 
     }
)

package uk.gov.companieshouse;

解组是从第一个从更大的Node中提取的Document完成的，在any项目列表中。当我们解析xml但是CoSearchItem中的所有字段都设置为null并且无法找出原因。

答案

您需要使用包级别@XmlSchema批注来指定模型的命名空间限定。

@XmlSchema(
    namespace = "http://xmlgw.companieshouse.gov.uk/v1-0/schema",
    elementFormDefault = XmlNsForm.QUALIFIED)
package example;

import javax.xml.bind.annotation.XmlNsForm;
import javax.xml.bind.annotation.XmlSchema;

这指定您不需要在@XmlRootElement类的@XmlType和NameSearch上指定名称空间URI。

欲获得更多信息

• http://blog.bdoughan.com/2010/08/jaxb-namespaces.html

---

解组是从任何项目列表中的较大文档中提取的第一个节点完成的。

确保用于创建节点的DOM parer是名称空间感知的。

documentBuilderFactory.setNamespaceAware(true);

另一答案

由于@Blaise Doughan，我找到了正确的答案。在查看包命名空间限定后，我发现它指向：

"http://xmlgw.companieshouse.gov.uk/v1-0"

它应该指向：

"http://xmlgw.companieshouse.gov.uk/v1-0/schema"

不确定这是怎么放错位置的。

另一答案

我通过在生成存根之前在xsd中创建elementFormDefault="unqualified"来解决这个问题，否则在package-info.java中手动进行更改