JAXB后返回null vaue解组

我试图来解读一个XML和它返回空值 XML：JAXB后返回null vaue解组

<letterOutHeader> 
     <lettertype> 
      MN13 
     </lettertype> 
     <letterReqid> 
      9294678 
     </letterReqid> 
     <language> 
      en 
     </language> 
     <attentionTo></attentionTo> 
     <addressLine1></addressLine1> 
     <addressLine2></addressLine2> 
     <city>Case City</city> 
     <state>NY</state> 
     <zipCode>59559</zipCode> 
     <dateOfLetter>12/28/2016</dateOfLetter> 
     <respondByDate/> 
     <externalNum>Ac0287356894754</externalNum> 
     <letterOutFlexField> 
      <name>fieldOne </name> 
      <value>valueOne</value> 
     </letterOutFlexField> 
     <letterOutFlexField> 
      <name>fieldTwo</name> 
      <value>valueTwo</value> 
     </letterOutFlexField> 
     <letterOutFlexField> 
      <name>fieldThree</name> 
      <value>valueThree</value> 
     </letterOutFlexField> 
     <letterOutFlexField> 
      <name>fieldFour</name> 
      <value>valueFour</value> 
     </letterOutFlexField> 
    </letterOutHeader>

豆：

package jaxb.Bean; 

import java.util.List; 

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

@XmlRootElement 
public class LetterOutHeader { 
    String lettertype; 
    String letterReqid; 
    String language; 
    String attentionTo; 
    String addressLine1; 
    String addressLine2; 
    String city; 
    String state; 
    String zipCode; 
    String dateOfLetter; 
    String respondByDate; 
    String externalNum; 
    List<LetterOutFlexFieldBean> flexFields; 
    @XmlAttribute 
    public String getLettertype() { 
     return lettertype; 
    } 
    public void setLettertype(String lettertype) { 
     this.lettertype = lettertype; 
    } 
    @XmlAttribute 
    public String getLetterReqid() { 
     return letterReqid; 
    } 
    public void setLetterReqid(String letterReqid) { 
     this.letterReqid = letterReqid; 
    } 
    @XmlAttribute 
    public String getLanguage() { 
     return language; 
    } 
    public void setLanguage(String language) { 
     this.language = language; 
    } 
    @XmlAttribute 
    public String getAttentionTo() { 
     return attentionTo; 
    } 
    public void setAttentionTo(String attentionTo) { 
     this.attentionTo = attentionTo; 
    } 
    @XmlAttribute 
    public String getAddressLine1() { 
     return addressLine1; 
    } 
    public void setAddressLine1(String addressLine1) { 
     this.addressLine1 = addressLine1; 
    } 
    @XmlAttribute 
    public String getAddressLine2() { 
     return addressLine2; 
    } 
    public void setAddressLine2(String addressLine2) { 
     this.addressLine2 = addressLine2; 
    } 
    @XmlAttribute 
    public String getCity() { 
     return city; 
    } 
    public void setCity(String city) { 
     this.city = city; 
    } 
    @XmlAttribute 
    public String getState() { 
     return state; 
    } 
    public void setState(String state) { 
     this.state = state; 
    } 
    @XmlAttribute 
    public String getZipCode() { 
     return zipCode; 
    } 
    public void setZipCode(String zipCode) { 
     this.zipCode = zipCode; 
    } 
    @XmlAttribute 
    public String getDateOfLetter() { 
     return dateOfLetter; 
    } 
    public void setDateOfLetter(String dateOfLetter) { 
     this.dateOfLetter = dateOfLetter; 
    } 
    @XmlAttribute 
    public String getRespondByDate() { 
     return respondByDate; 
    } 
    public void setRespondByDate(String respondByDate) { 
     this.respondByDate = respondByDate; 
    } 
    @XmlAttribute 
    public String getExternalNum() { 
     return externalNum; 
    } 
    public void setExternalNum(String externalNum) { 
     this.externalNum = externalNum; 
    } 
    @XmlElement 
    public List<LetterOutFlexFieldBean> getFlexFields() { 
     return flexFields; 
    } 
    public void setFlexFields(List<LetterOutFlexFieldBean> flexFields) { 
     this.flexFields = flexFields; 
    } 


}

拆封：

package jaxb.client; 

import java.io.File; 

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

import jaxb.Bean.LetterOutBean; 
import jaxb.Bean.LetterOutHeader; 

public class XmlToObject { 

    /** 
    * @param args 
    */ 
    public static void main(String[] args) { 
     // TODO Auto-generated method stub 
     try { 

      File file = new File("C:/Users/sindhu/Desktop/Kranthi/jaxB/baseXML.xml"); 
      JAXBContext jaxbContext = JAXBContext.newInstance(LetterOutHeader.class); 

      Unmarshaller jaxbUnmarshaller = jaxbContext.createUnmarshaller(); 
      LetterOutHeader que= (LetterOutHeader) jaxbUnmarshaller.unmarshal(file); 

      System.out.println(que.getCity()); 
      /* System.out.println("Answers:"); 
      List<Answer> list=que.getAnswers(); 
      for(Answer ans:list) 
       System.out.println(ans.getId()+" "+ans.getAnswername()+" "+ans.getPostedby()); 
*/  
      } catch (JAXBException e) { 
      e.printStackTrace(); 
      } 
    } 

}

我已经看了下面的帖子，以避免重复的问题 JAXB unmarshal returning null values JAXB unmarshalling returning Null

来源

2016-12-29 user2727493

您提供的XML和JAXB类之间有许多不匹配。首先，您的示例XML中没有属性，但JAXB包含@XmlAttribute。其次，最好明确声明@XmlAccessorType，否则它只查找public字段和方法。

LetterOutHeader.java

package int1.d3; 

import java.util.ArrayList; 
import java.util.List; 

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

@XmlRootElement(name="letterOutHeader") 
@XmlAccessorType(XmlAccessType.FIELD) 
public class LetterOutHeader { 
    String lettertype; 
    String letterReqid; 
    String language; 
    String attentionTo; 
    String addressLine1; 
    String addressLine2; 
    String city; 
    String state; 
    String zipCode; 
    String dateOfLetter; 
    String respondByDate; 
    String externalNum; 
    @XmlElement(name="letterOutFlexField") 
    List<LetterOutFlexFieldBean> flexField; 


    public String getLettertype() { 
     return lettertype; 
    } 
    public void setLettertype(String lettertype) { 
     this.lettertype = lettertype; 
    } 

    public String getLetterReqid() { 
     return letterReqid; 
    } 
    public void setLetterReqid(String letterReqid) { 
     this.letterReqid = letterReqid; 
    } 

    public String getLanguage() { 
     return language; 
    } 
    public void setLanguage(String language) { 
     this.language = language; 
    } 

    public String getAttentionTo() { 
     return attentionTo; 
    } 
    public void setAttentionTo(String attentionTo) { 
     this.attentionTo = attentionTo; 
    } 

    public String getAddressLine1() { 
     return addressLine1; 
    } 
    public void setAddressLine1(String addressLine1) { 
     this.addressLine1 = addressLine1; 
    } 

    public String getAddressLine2() { 
     return addressLine2; 
    } 
    public void setAddressLine2(String addressLine2) { 
     this.addressLine2 = addressLine2; 
    } 

    public String getCity() { 
     return city; 
    } 
    public void setCity(String city) { 
     this.city = city; 
    } 

    public String getState() { 
     return state; 
    } 
    public void setState(String state) { 
     this.state = state; 
    } 

    public String getZipCode() { 
     return zipCode; 
    } 
    public void setZipCode(String zipCode) { 
     this.zipCode = zipCode; 
    } 

    public String getDateOfLetter() { 
     return dateOfLetter; 
    } 
    public void setDateOfLetter(String dateOfLetter) { 
     this.dateOfLetter = dateOfLetter; 
    } 

    public String getRespondByDate() { 
     return respondByDate; 
    } 
    public void setRespondByDate(String respondByDate) { 
     this.respondByDate = respondByDate; 
    } 

    public String getExternalNum() { 
     return externalNum; 
    } 
    public void setExternalNum(String externalNum) { 
     this.externalNum = externalNum; 
    } 
    public List<LetterOutFlexFieldBean> getFlexFields() { 
     if(flexField == null) { 
      flexField = new ArrayList<LetterOutFlexFieldBean>(); 
     } 
     return this.flexField; 
    } 
}

来源

2017-01-02 13:31:46 ulab

JAXB后返回null vaue解组

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