unexpected element (uri:"", local:"sean:person"). Expected elements are <{http://sean.com}person>

详细报错如下：

Exception in thread "main" javax.xml.bind.UnmarshalException: unexpected element (uri:"", local:"sean:person"). Expected elements are <{http://sean.com}person>at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallingContext.handleEvent(UnmarshallingContext.java:647)at com.sun.xml.internal.bind.v2.runtime.unmarshaller.Loader.reportError(Loader.java:243)at com.sun.xml.internal.bind.v2.runtime.unmarshaller.Loader.reportError(Loader.java:238)at com.sun.xml.internal.bind.v2.runtime.unmarshaller.Loader.reportUnexpectedChildElement(Loader.java:105)at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallingContext$DefaultRootLoader.childElement(UnmarshallingContext.java:1048)at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallingContext._startElement(UnmarshallingContext.java:483)at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallingContext.startElement(UnmarshallingContext.java:465)at com.sun.xml.internal.bind.v2.runtime.unmarshaller.InterningXmlVisitor.startElement(InterningXmlVisitor.java:60)at com.sun.xml.internal.bind.v2.runtime.unmarshaller.SAXConnector.startElement(SAXConnector.java:135)at com.sun.xml.internal.bind.unmarshaller.DOMScanner.visit(DOMScanner.java:229)at com.sun.xml.internal.bind.unmarshaller.DOMScanner.scan(DOMScanner.java:112)at com.sun.xml.internal.bind.unmarshaller.DOMScanner.scan(DOMScanner.java:95)at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal0(UnmarshallerImpl.java:312)at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal(UnmarshallerImpl.java:292)at com.sean.JAXBHelper.getObjFromDoc(JAXBHelper.java:22)at com.sean.Test.main(Test.java:19)

期待的元素为person，其相应的命名空间为http://sean.com

获取到的元素为person，其相应的命名空间为空

XML Schema文件：

<?xml version="1.0" encoding="UTF-8"?><xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"targetNamespace="http://sean.com"elementFormDefault="qualified" attributeFormDefault="unqualified"><xs:element name="person"><xs:complexType><xs:sequence><xs:element name="name" type="xs:string"/><xs:element name="age" type="xs:unsignedShort"/></xs:sequence><xs:attribute name="id" type="xs:string"/></xs:complexType></xs:element></xs:schema>

通过Eclipse的JAXB插件，使用XML Schema生成的代码：

代码中一定要包含XmlRootElement标签才能使用JAXB进行正转、反转

package com.sean;import javax.xml.bind.annotation.XmlAccessType;import javax.xml.bind.annotation.XmlAccessorType;import javax.xml.bind.annotation.XmlAttribute;import javax.xml.bind.annotation.XmlElement;import javax.xml.bind.annotation.XmlRootElement;import javax.xml.bind.annotation.XmlSchemaType;import javax.xml.bind.annotation.XmlType;@XmlAccessorType(XmlAccessType.FIELD)@XmlType(name = "", propOrder = {    "name",    "age"})@XmlRootElement(name = "person")public class Person {    @XmlElement(required = true)    protected String name;    @XmlSchemaType(name = "unsignedShort")    protected int age;    @XmlAttribute(name = "id")    protected String id;    public String getName() {        return name;    }    public void setName(String value) {        this.name = value;    }    public int getAge() {        return age;    }    public void setAge(int value) {        this.age = value;    }    public String getId() {        return id;    }    public void setId(String value) {        this.id = value;    }}

进行测试的XML文件：

<?xml version="1.0" encoding="UTF-8"?><sean:person xmlns:sean="http://sean.com" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"><sean:name>abc</sean:name><sean:age>11</sean:age></sean:person>

测试方法类：

问题的原因是下面代码中被注释掉的那一行

解析XML文件并构建其对应的Document对象时，默认忽略元素对应的命令空间，JAXB在进行反转时，无法从Document对象中找到元素对应的命令空间，就会包标题的错

package com.sean;import java.io.File;import javax.xml.parsers.DocumentBuilder;import javax.xml.parsers.DocumentBuilderFactory;import org.w3c.dom.Document;public class Test {public static void main(String[] args) throws Exception {String path = Test.class.getResource("/person.xml").getFile();File file = new File(path);DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();  //    factory.setNamespaceAware(true);    DocumentBuilder builder = factory.newDocumentBuilder();    Document doc = builder.parse(file);    Object obj = JAXBHelper.getObjFromDoc(doc, Person.class);    System.out.println(obj.toString());}}