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java jaxb简单解析需要@XmlAccessorType（XmlAccessType.FIELD）注释

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我正在尝试将xml解析为java对象，我已阅读并实现了以下教程：

http://www.vogella.com/articles/JAXB/article.html (works perfectly)

但是当我创建自己的clases时（类似于教程中的那些）

我得到：线程中的异常"main" com.sun.xml.internal.bind.v2.runtime.IllegalAnnotationsException：IllegalAnnotationExceptions的1个计数 Class has two properties of the same name "clienteList"

除非我在类Clientes上使用@XmlAccessorType（XmlAccessType.FIELD），但在教程中没有使用 .

有任何想法吗 ？

（它与@XmlAccessorType（XmlAccessType.FIELD）注释一起工作正常，但我想知道为什么我的类需要它而不是教程中的类）

提前感谢您提供任何信息 .

class 客户

package mx.com.findep.crediseguros.dto.servicios.finsol;

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

@XmlRootElement(name = "cliente")
public class Cliente {

  private String numeroPersona;

  @XmlElement(name = "numeroPersona")
  public String getNumeroPersona() {
    return numeroPersona;
  }

  public void setNumeroPersona(String numeroPersona) {
    this.numeroPersona = numeroPersona;
  }

}

class 客户

package mx.com.findep.crediseguros.dto.servicios.finsol;

import java.util.ArrayList;

import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlElementWrapper;
import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement(name = "clientes")
//@XmlAccessorType(XmlAccessType.FIELD) //without this line it fails
public class Clientes {

      // XmLElementWrapper generates a wrapper element around XML representation
      @XmlElementWrapper(name = "clienteList")
      // XmlElement sets the name of the entities
      @XmlElement(name = "cliente")
      private ArrayList<Cliente> clienteList;


      public void setClienteList(ArrayList<Cliente> clienteList) {
        this.clienteList = clienteList;
      }

      public ArrayList<Cliente> getClienteList() {
        return clienteList;
      }


    }

测试我的编组

package mx.com.findep.crediseguros.dto.servicios.finsol;

import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;


public class TestClientesXml {

  private static final String SOME_XML = "C:/bea/user_projects/domains/DominioDesarrollo/esquemas/calculoCostoSeguroPeticion.xml";

  public static void main(String[] args) throws JAXBException, IOException {

    ArrayList<Cliente> clienteList = new ArrayList<Cliente>();

    Cliente cliente1 = new Cliente();
    cliente1.setNumeroPersona("1");

    clienteList.add(cliente1);

    Cliente cliente2 = new Cliente();
    cliente2.setNumeroPersona("2");
    clienteList.add(cliente2);

    Clientes clientes = new Clientes();

    clientes.setClienteList(clienteList);

    JAXBContext context = JAXBContext.newInstance(Clientes.class);
    Marshaller m = context.createMarshaller();
    m.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE);

    m.marshal(clientes, System.out);

    m.marshal(clientes, new File(SOME_XML));

    System.out.println();
    System.out.println("Output from our XML File: ");
    Unmarshaller um = context.createUnmarshaller();
    Clientes clientes2 = (Clientes) um.unmarshal(new FileReader(SOME_XML));
    ArrayList<Cliente> list = clientes2.getClienteList();
    for (Cliente cliente : list) {
      System.out.println("Cliente: " + cliente.getNumeroPersona());
    }
  }
}
java xml xml-parsing jaxb jaxb2

2 回答

  • 0

    默认情况下，JAXB将公共字段和属性视为映射 . 如果您注释一个字段，那么它会将字段和属性视为映射导致冲突 . 如果没有 @XmlAccessorType(XmlAccessType.FIELD) ，您应该注释get或set方法 .

    For More Information

    回复于
  • 5

    所以我们说：

    @XmlRootElement(name = "book")
public class Book {
    @XmlElement(name = "book_title")
    private String title;
    public getTitle(){..}
    public setTitle(){...}
    }

    如果我们运行代码，我们将在线程“main”中有Exception

    com.sun.xml.internal.bind.v2.runtime.IllegalAnnotationsException: 1 counts of IllegalAnnotationExceptions
Class has two properties of the same name "title"
    this problem is related to the following location:
        at public java.lang.String com.example.jaxb.Book.getTitle()
        at com.example.jaxb.Book
    this problem is related to the following location:
        at private java.lang.String com.example.jaxb.Book.title
        at com.example.jaxb.Book

    但是如果我们添加注释： XmlAccessorType

    @XmlRootElement(name = "book")
@XmlAccessorType(XmlAccessType.FIELD)
public class Book {

    错误将消失 .

    当有一个想要编组并且有10个字段的类时，我更喜欢只注释字段，而不是一次设置setter然后是getter . 因此，请使用@XmlAccessorType并仅注释字段 .

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