如何將帶有 XSD/命名空間的 XML 轉換為對象？我收到此錯誤：javax.xml.bind.UnmarshalException：意外元素（uri：“ http://www.opengis.net/wfs/2.0 ”，本地：“FeatureCollection”）。預期的元素是 <{}FeatureCollection>這是示例 XML：<wfs:FeatureCollection xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:fes="http://www.opengis.net/fes/2.0" xmlns:wfs="http://www.opengis.net/wfs/2.0" xmlns:gml="http://www.opengis.net/gml/3.2" xmlns:ows="http://www.opengis.net/ows/1.1" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" numberMatched="7961422" numberReturned="0" timeStamp="2019-07-16T09:44:51.540Z" xsi:schemaLocation="http://www.opengis.net/wfs/2.0 http://schemas.opengis.net/wfs/2.0/wfs.xsd"/>我的簡單 JAXB 轉換器是：public static Object convertXmlToObject(String xmlString, Class targetClass) { JAXBContext jaxbContext; try { jaxbContext = JAXBContext.newInstance( targetClass); Unmarshaller jaxbUnmarshaller = jaxbContext.createUnmarshaller(); return jaxbUnmarshaller.unmarshal(new StringReader(xmlString)); } catch (JAXBException e) { e.printStackTrace(); return null; }}這個方法的調用是：TargetObject to = (TargetObject) converter.convertXmlToObject( xmlString, TargetObject.class);目標對象是：@XmlRootElement( name="FeatureCollection")public class TargetObject { private long numberMatched = -1; private long numberReturned = -1; private LocalDateTime timeStamp; // ... all getters @XmlAttribute public void setNumberMatched(long numberMatched) { this.numberMatched = numberMatched; } @XmlAttribute public void setNumberReturned(long numberReturned) { this.numberReturned = numberReturned; } @XmlAttribute @XmlJavaTypeAdapter(value = LocalDateTimeAdapter.class) public void setTimeStamp(LocalDateTime timeStamp) { this.timeStamp = timeStamp; }}如何改進我的代碼以將 XML 字符串轉換為對象？
1 回答
揚帆大魚
TA貢獻1799條經驗 獲得超9個贊
享受這個通用的解決方案：
轉換器類
Junit 測試——顯示了 1 個沒有名稱空間的測試，但它確實適用于名稱空間
使用 XSLT 剝離名稱空間的轉換器類。JAXB 有時過于直白，您可以在許多帖子中看到這一點。
public class XmlToPojo {
public static Object convertXmlToObject(String xmlString, Class targetClass) {
JAXBContext jaxbContext;
try {
// Step 1 - remove namespaces
StreamSource xmlSource = new StreamSource(new StringReader(xmlString));
StreamResult result = new StreamResult(new StringWriter());
removeNamespace(xmlSource, result);
// Step 2 - convert XML to object
jaxbContext = JAXBContext.newInstance(targetClass);
Unmarshaller jaxbUnmarshaller = jaxbContext.createUnmarshaller();
return jaxbUnmarshaller.unmarshal(new StringReader(result.getWriter().toString()));
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
// Remove namespaces from XML
private static String xsltNameSpaceRemover = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n" +
"<xsl:stylesheet version=\"1.0\" xmlns:xsl=\"http://www.w3.org/1999/XSL/Transform\">\n" +
"\n" +
" <xsl:output indent=\"yes\" method=\"xml\" encoding=\"utf-8\" omit-xml-declaration=\"yes\"/>\n" +
"\n" +
" <!-- Stylesheet to remove all namespaces from a document -->\n" +
" <!-- NOTE: this will lead to attribute name clash, if an element contains\n" +
" two attributes with same local name but different namespace prefix -->\n" +
" <!-- Nodes that cannot have a namespace are copied as such -->\n" +
"\n" +
" <!-- template to copy elements -->\n" +
" <xsl:template match=\"*\">\n" +
" <xsl:element name=\"{local-name()}\">\n" +
" <xsl:apply-templates select=\"@* | node()\"/>\n" +
" </xsl:element>\n" +
" </xsl:template>\n" +
"\n" +
" <!-- template to copy attributes -->\n" +
" <xsl:template match=\"@*\">\n" +
" <xsl:attribute name=\"{local-name()}\">\n" +
" <xsl:value-of select=\".\"/>\n" +
" </xsl:attribute>\n" +
" </xsl:template>\n" +
"\n" +
" <!-- template to copy the rest of the nodes -->\n" +
" <xsl:template match=\"comment() | text() | processing-instruction()\">\n" +
" <xsl:copy/>\n" +
" </xsl:template>\n" +
"\n" +
"</xsl:stylesheet>";
private static void removeNamespace(Source xmlSource, Result xmlOutput) throws TransformerException {
TransformerFactory factory = TransformerFactory.newInstance();
StreamSource xsltSource = new StreamSource(new StringReader(xsltNameSpaceRemover));
Transformer transformer = factory.newTransformer(xsltSource);
transformer.transform(xmlSource, xmlOutput);
}
}
一個簡單的 Junit 測試：
public class XmlToPojoTest {
@Test
public void testBasic() {
String xmlString = "<employee>" +
" <department>" +
" <id>101</id>" +
" <name>IT-ABC</name>" +
" </department>" +
" <firstName>JJ</firstName>" +
" <id>1</id>" +
" <lastName>JoHo</lastName>" +
"</employee>";
XmlToPojo xmlToPojo = new XmlToPojo();
Employee emp = (Employee) xmlToPojo.convertXmlToObject(xmlString, Employee.class);
assertEquals("JJ", emp.getFirstName());
assertEquals("IT-ABC", emp.getDepartment().getName());
}
}
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