JAX RS - JSON和XML循环/循环引用错误

1 回答

• 4

  Note: 我是EclipseLink JAXB (MOXy)领导，是JAXB (JSR-222)专家组的成员 .

  MOXy 提供了 @XmlInverseReference 扩展，可用于支持XML和JSON绑定中的双向关系 .

  ---

  JAVA MODEL

  Customer

  Customer 有 PhoneNumber 个对象的集合 .

  package forum12312395;
  
  import java.util.List;
  import javax.xml.bind.annotation.*;
  
  @XmlRootElement
  public class Customer {
  
      private List<PhoneNumber> phoneNumbers;
  
      @XmlElement(name="phone-number")
      public List<PhoneNumber> getPhoneNumbers() {
          return phoneNumbers;
      }
  
      public void setPhoneNumbers(List<PhoneNumber> phoneNumbers) {
          this.phoneNumbers = phoneNumbers;
      }
  
  }
  

  PhoneNumber

  每个 PhoneNumber 对象都维护一个指向 Customer 对象的后向指针 . 此属性注释为 @XmlInverseReference .

  package forum12312395;
  
  import javax.xml.bind.annotation.XmlValue;
  import org.eclipse.persistence.oxm.annotations.XmlInverseReference;
  
  public class PhoneNumber {
  
      private String value;
      private Customer customer;
  
      @XmlValue
      public String getValue() {
          return value;
      }
  
      public void setValue(String value) {
          this.value = value;
      }
  
      @XmlInverseReference(mappedBy="phoneNumbers")
      public Customer getCustomer() {
          return customer;
      }
  
      public void setCustomer(Customer customer) {
          this.customer = customer;
      }
  
  }
  

  jaxb.properties

  要将MOXy用作JAXB提供程序，您需要在与域模型相同的包中包含一个名为 jaxb.properties 的文件，并带有以下条目（请参阅：http://blog.bdoughan.com/2011/05/specifying-eclipselink-moxy-as-your.html）：

  javax.xml.bind.context.factory=org.eclipse.persistence.jaxb.JAXBContextFactory
  

  ---

  INPUT

  以下是我们将在此示例中解组的文档

  input.xml

  <?xml version="1.0" encoding="UTF-8"?>
  <customer>
      <phone-number>555-WORK</phone-number>
      <phone-number>555-HOME</phone-number>
  </customer>
  

  input.json

  {
      "customer" : {
          "phone-number" : ["555-HOME", "555-WORK"]
      }
  }
  

  ---

  DEMO

  package forum12312395;
  
  import javax.xml.bind.*;
  import javax.xml.transform.stream.StreamSource;
  import org.eclipse.persistence.jaxb.UnmarshallerProperties;
  import org.eclipse.persistence.oxm.MediaType;
  
  public class Demo {
  
      public static void main(String[] args) throws Exception {
          JAXBContext jc = JAXBContext.newInstance(Customer.class);
  
          // JSON
          Unmarshaller jsonUnmarshaller = jc.createUnmarshaller();
          jsonUnmarshaller.setProperty(UnmarshallerProperties.MEDIA_TYPE, MediaType.APPLICATION_JSON);
          StreamSource json = new StreamSource("src/forum12312395/input.json");
          Customer customerFromJSON = (Customer) jsonUnmarshaller.unmarshal(json);
          for(PhoneNumber phoneNumber : customerFromJSON.getPhoneNumbers()) {
              System.out.println(phoneNumber.getCustomer());
          }
  
          // XML
          Unmarshaller xmlUnmarshaller = jc.createUnmarshaller();
          StreamSource xml = new StreamSource("src/forum12312395/input.xml");
          Customer customerFromXML = (Customer) xmlUnmarshaller.unmarshal(xml);
          for(PhoneNumber phoneNumber : customerFromXML.getPhoneNumbers()) {
              System.out.println(phoneNumber.getCustomer());
          }
      }
  
  }
  

  ---

  OUTPUT

  以下是运行演示代码的输出 . 如您所见， customer 属性填充在所有 PhoneNumber 对象上 .

  forum12312395.Customer@3ef38fd1
  forum12312395.Customer@3ef38fd1
  forum12312395.Customer@320eef20
  forum12312395.Customer@320eef20
  

  ---

  FOR MORE INFORMATION

  • http://blog.bdoughan.com/2010/07/jpa-entities-to-xml-bidirectional.html

  • http://blog.bdoughan.com/2011/08/json-binding-with-eclipselink-moxy.html

  • http://blog.bdoughan.com/2012/05/moxy-as-your-jax-rs-json-provider.html

  • http://blog.bdoughan.com/2011/08/binding-to-json-xml-geocode-example.html

  回复于 2024-04-26T03:02:51+08:00