在java中获取IllegalAnnotationsException

Question

我想解析xml文件的字符串到java对象，同时执行上面的代码我得到IllegalAnnotationsException，我是新来的这可以任何人帮助我在这个？

import java.io.StringReader; 
import java.io.StringWriter; 

import javax.xml.bind.JAXBContext; 
import javax.xml.bind.JAXBException; 
import javax.xml.bind.Unmarshaller; 
import javax.xml.parsers.DocumentBuilder; 
import javax.xml.parsers.DocumentBuilderFactory; 
import javax.xml.transform.Transformer; 
import javax.xml.transform.TransformerException; 
import javax.xml.transform.TransformerFactory; 
import javax.xml.transform.dom.DOMSource; 
import javax.xml.transform.stream.StreamResult; 

import org.w3c.dom.Document; 
import org.xml.sax.InputSource; 

public class RestClientExample { 

    public static void main(String[] args) { 

     final String xmlStr = "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?>\n" 
       + "<Person><name>Pankaj</name><age>25</age></Person>"; 
     Document doc = convertStringToDocument(xmlStr); 

     String str = convertDocumentToString(doc); 
     System.out.println(str); 


     JAXBContext jaxbContext; 
     try { 
      jaxbContext = JAXBContext.newInstance(Person.class); 
      Unmarshaller unmarshaller = jaxbContext.createUnmarshaller(); 
      StringReader reader = new StringReader(str); 
      Person person = (Person) unmarshaller.unmarshal(reader); 
     } catch (JAXBException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } 



    } 

    private static String convertDocumentToString(Document doc) { 
     TransformerFactory tf = TransformerFactory.newInstance(); 
     Transformer transformer; 
     try { 
      transformer = tf.newTransformer(); 
      // below code to remove XML declaration 
      // transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, 
      // "yes"); 
      StringWriter writer = new StringWriter(); 
      transformer.transform(new DOMSource(doc), new StreamResult(writer)); 
      String output = writer.getBuffer().toString(); 
      return output; 
     } catch (TransformerException e) { 
      e.printStackTrace(); 
     } 

     return null; 
    } 

    private static Document convertStringToDocument(String xmlStr) { 
     DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); 
     DocumentBuilder builder; 
     try { 
      builder = factory.newDocumentBuilder(); 
      Document doc = builder.parse(new InputSource(new StringReader(xmlStr))); 
      return doc; 
     } catch (Exception e) { 
      e.printStackTrace(); 
     } 
     return null; 
    } 

} 

以下是人员类。

import javax.xml.bind.annotation.XmlElement; import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement(name = "Person") 
public class Person { 
    @XmlElement(name = "name") 
    String name; 
    @XmlElement(name = "age") 
    int age; 

    public String getName() { 
     return name; 
    } 

    public void setName(String name) { 
     this.name = name; 
    } 

    public int getAge() { 
     return age; 
    } 

    public void setAge(int age) { 
     this.age = age; 
    } 



} 

这是我得到

com.sun.xml.internal.bind.v2.runtime.IllegalAnnotationsException: 2 counts of IllegalAnnotationExceptions 
Class has two properties of the same name "age" 
    this problem is related to the following location: 
     at public int Person.getAge() 
     at Person 
    this problem is related to the following location: 
     at int Person.age 
     at Person 
Class has two properties of the same name "name" 
    this problem is related to the following location: 
     at public java.lang.String Person.getName() 
     at Person 
    this problem is related to the following location: 
     at java.lang.String Person.name 
     at Person 

    at com.sun.xml.internal.bind.v2.runtime.IllegalAnnotationsException$Builder.check(Unknown Source) 
    at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.getTypeInfoSet(Unknown Source) 
    at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.<init>(Unknown Source) 
    at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.<init>(Unknown Source) 
    at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl$JAXBContextBuilder.build(Unknown Source) 
    at com.sun.xml.internal.bind.v2.ContextFactory.createContext(Unknown Source) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) 
    at java.lang.reflect.Method.invoke(Unknown Source) 
    at javax.xml.bind.ContextFinder.newInstance(Unknown Source) 
    at javax.xml.bind.ContextFinder.newInstance(Unknown Source) 
    at javax.xml.bind.ContextFinder.find(Unknown Source) 
    at javax.xml.bind.JAXBContext.newInstance(Unknown Source) 
    at javax.xml.bind.JAXBContext.newInstance(Unknown Source) 
    at RestClientExample.main(RestClientExample.java:38) 

Answer 1

的@XmlRootElement注释会使类为元素的领域外，就没有必要为@XmlElement注释。 See documentation.