标签：none javabean 管理 nsf logs 转换 反向 als expec
JAXB（Java Architecture for XML Binding) 是一个业界的标准，是一项可以根据XML Schema产生Java类的技术。该过程中，JAXB也提供了将XML实例文档反向生成Java对象树的方法，并能将Java对象树的内容重新写到XML实例文档。是JDK的组成部分
当使用 @XmlRootElement 注释对顶层类或枚举类型进行注释时，类型值被表示为 XML 文档中的 XML 元素。
JAXB Annotation
XmlAccessorType
默认规则：
默认情况下，如果包中不存在 @XmlAccessorType，那么假定使用以下包级别注释。
@XmlAccessorType(XmlAccessType.PUBLIC_MEMBER)
默认情况下，如果类中不存在 @XmlAccessorType，并且没有任何超类是使用 @XmlAccessorType 注释的，则假定在类中使用以下默认注释：
@XmlAccessorType(XmlAccessType.PUBLIC_MEMBER)
可能值：
FIELD: JAXB 绑定类中的每个非静态、非瞬态字段将会自动绑定到 XML，除非由 XmlTransient 注释。
NONE: 所有字段或属性都不能绑定到 XML，除非使用一些 JAXB 注释专门对它们进行注释。
PROPERTY: JAXB 绑定类中的每个获取方法/设置方法（get/set方法）对将会自动绑定到 XML，除非由 XmlTransient 注释。
PUBLIC_MEMBER:每个公共获取方法/设置方法对和每个公共字段将会自动绑定到 XML，除非由 XmlTransient 注释。
Java Bean转换成XML实例：
实体类：
@XmlRootElement(name = "person") @XmlAccessorType(XmlAccessType.FIELD) public class Person { private String name; private Integer age; public String getName() { return name; } public void setName(String name) { this.name = name; } public Integer getAge() { return age; } public void setAge(Integer age) { this.age = age; } }
转换代码：
import javax.xml.bind.JAXBContext; import javax.xml.bind.JAXBException; import javax.xml.bind.Marshaller; import javax.xml.bind.Unmarshaller; public class JAXBTest { public static void main(String[] args) throws JAXBException { JAXBContext context = JAXBContext.newInstance(Person.class); Marshaller marshaller = context.createMarshaller(); Unmarshaller unmarshaller = context.createUnmarshaller(); Person person = new Person(); person.setAge(11); person.setName("测试"); marshaller.marshal(person, System.out); System.out.println(); } }
输出结果：
<?xml version="1.0" encoding="UTF-8" standalone="yes"?><person><name>测试</name><age>11</age></person>
XML转换成Bean实例：
import javax.xml.bind.JAXBContext; import javax.xml.bind.JAXBException; import javax.xml.bind.Unmarshaller; import java.io.StringReader; public class JAXBTest { public static void main(String[] args) throws JAXBException { JAXBContext context = JAXBContext.newInstance(Person.class); Unmarshaller unmarshaller = context.createUnmarshaller(); String xml = "<person><age>11</age><name>测试</name></person>"; Person person = (Person) unmarshaller.unmarshal(new StringReader(xml)); System.out.println(person.getAge()); } }
XML转换成Bean是有命名空间的情况：
public class JAXBTest { public static void main(String[] args) throws JAXBException { JAXBContext context = JAXBContext.newInstance(Person.class); Unmarshaller unmarshaller = context.createUnmarshaller(); String xml = "<person xmlns=\"http://test.org/\"><age>11</age><name>测试</name></person>"; Person person = (Person) unmarshaller.unmarshal(new StringReader(xml)); System.out.println(person.getAge()); } }
会报错：
Exception in thread "main" javax.xml.bind.UnmarshalException: 意外的元素 (uri:"http://test.org/", local:"person")。所需元素为<{}person>
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallingContext.handleEvent(UnmarshallingContext.java:726)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.Loader.reportError(Loader.java:247)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.Loader.reportError(Loader.java:242)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.Loader.reportUnexpectedChildElement(Loader.java:109)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallingContext$DefaultRootLoader.childElement(UnmarshallingContext.java:1131)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallingContext._startElement(UnmarshallingContext.java:556)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallingContext.startElement(UnmarshallingContext.java:538)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.SAXConnector.startElement(SAXConnector.java:153)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.startElement(AbstractSAXParser.java:509)
at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.scanStartElement(XMLNSDocumentScannerImpl.java:374)
at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl$NSContentDriver.scanRootElementHook(XMLNSDocumentScannerImpl.java:613)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:3132)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$PrologDriver.next(XMLDocumentScannerImpl.java:852)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:602)
at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(XMLNSDocumentScannerImpl.java:112)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:505)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:841)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:770)
at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:141)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1213)
at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:643)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal0(UnmarshallerImpl.java:243)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal(UnmarshallerImpl.java:214)
at javax.xml.bind.helpers.AbstractUnmarshallerImpl.unmarshal(AbstractUnmarshallerImpl.java:157)
at javax.xml.bind.helpers.AbstractUnmarshallerImpl.unmarshal(AbstractUnmarshallerImpl.java:214)
一种处理方法就是XML转换成Bean的时候忽略命名空间：
import org.xml.sax.InputSource; import org.xml.sax.SAXException; import org.xml.sax.XMLReader; import javax.xml.bind.JAXBContext; import javax.xml.bind.JAXBException; import javax.xml.bind.Unmarshaller; import javax.xml.parsers.ParserConfigurationException; import javax.xml.parsers.SAXParserFactory; import javax.xml.transform.Source; import javax.xml.transform.sax.SAXSource; import java.io.StringReader; public class JAXBTest { public static void main(String[] args) throws JAXBException, ParserConfigurationException, SAXException { JAXBContext jaxbContext = JAXBContext.newInstance(Person.class); Unmarshaller unmarshaller = jaxbContext.createUnmarshaller(); String xml = "<person xmlns=\"http://test.org/\"><age>11</age><name>测试</name></person>"; StringReader reader = new StringReader(xml); SAXParserFactory sax = SAXParserFactory.newInstance(); sax.setNamespaceAware(false);//设置忽略明明空间 XMLReader xmlReader = sax.newSAXParser().getXMLReader(); Source source = new SAXSource(xmlReader, new InputSource(reader)); Person person = (Person) unmarshaller.unmarshal(source); System.out.println(person.getAge()); } }
如果我们的根元素没有子元素并且里面有值 而且我们需要解析XML获取这个值的时候 一种解决办法：修改我们的Bean注解 这样就能正确转化成Bean
import javax.xml.bind.annotation.XmlRootElement; import javax.xml.bind.annotation.XmlValue; @XmlRootElement(name = "string") public class XMLToBeanlVo { private String stringValue; @XmlValue public String getStringValue() { return stringValue; } public void setStringValue(String stringValue) { this.stringValue = stringValue; } }
参考：https://www.cnblogs.com/Nouno/p/5728112.html
标签：none javabean 管理 nsf logs 转换 反向 als expec
原文地址：http://www.cnblogs.com/programmer1/p/7993908.html
