为什么JAXB java xml解组器返回null_Java_Xml_Jaxb

为什么JAXB java xml解组器返回null

java xml jaxb

为什么JAXB java xml解组器返回null,java,xml,jaxb,Java,Xml,Jaxb,我试图将XML解组为java类，如下所示：- <Features_res> <StartWeek>202017</StartWeek> <EndWeek>202035</EndWeek> <Pno12>ABCDEEB</Pno12> <FeatureList> <Feature> <Code>T002</Code&g

我试图将XML解组为java类，如下所示：-

<Features_res>
   <StartWeek>202017</StartWeek>
  <EndWeek>202035</EndWeek>
  <Pno12>ABCDEEB</Pno12>

  <FeatureList>
      <Feature>
            <Code>T002</Code>
       </Feature>
         <Feature>
          <Code>T002</Code>
       </Feature>
    </FeatureList>
</Features_res>

我的xml文件如下所示：-

<Features_res>
   <StartWeek>202017</StartWeek>
  <EndWeek>202035</EndWeek>
  <Pno12>ABCDEEB</Pno12>

  <FeatureList>
      <Feature>
            <Code>T002</Code>
       </Feature>
         <Feature>
          <Code>T002</Code>
       </Feature>
    </FeatureList>
</Features_res>

Java内部响应：-

@XmlRootElement(name = "Features_res")
public class InteriorResponse {

@XmlElement(name = "StartWeek")
private int sWeek;
@XmlElement(name = "EndWeek")
private int eWeek;
@XmlElement(name = "Pno12")
private String p12;
List<Feature> featureList;

public InteriorResponse() {
}

public InteriorResponse(int startWeek, int endWeek, String pno12) {
    super();
    this.sWeek = startWeek;
    this.eWeek = endWeek;
    this.p12 = pno12;
}

public int getStartWeek() {
    return sWeek;
}
public void setStartWeek(int startWeek) {
    this.sWeek = startWeek;
}
public int getEndWeek() {
    return eWeek;
}
public void setEndWeek(int endWeek) {
    this.eWeek = endWeek;
}
public String getPno12() {
    return p12;
}
public void setPno12(String pno12) {
    this.p12 = pno12;
}
public List<Feature> getFeatureList() {
    return featureList;
}

@XmlElement(name = "FeatureList")
public void setFeatureList(List<Feature> featureList) {
    this.featureList = featureList;
}           
 }

我将上述课程用作：-

    public static void xmlToInterior() {
    File file = new File("minxml.xml");
    JAXBContext jaxbContext;

    try {
        jaxbContext = JAXBContext.newInstance(InteriorResponse.class);
        Unmarshaller unmarshaller = jaxbContext.createUnmarshaller();
        InteriorResponse interiorFeatures = (InteriorResponse) unmarshaller.unmarshal(file);
        List<Feature> list_feat =  interiorFeatures.getFeatureList();
        for(Feature ft : list_feat) {
            System.out.println(ft.getCode());
        }
    } catch (JAXBException e) {
        e.printStackTrace();
    }       
 }

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

public class Option {

    @XmlElement(name = "Option")
    private String option_;

    public String getOption() {
        return option_;
    }


    public void setOption(String option) {
        this.option_ = option;
    }   
}

所以我做了一个新的课程：-

    public class OptionList {

    private List<Option> options;

    @XmlElement(name = "Option")
    public List<Option> getOptions() {
        return options;
    }

    public void setOptions(List<Option> options) {
        this.options = options;
    }
}

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

@XmlRootElement(name = "Features_res")
public class InteriorResponse {

  @XmlElement(name = "StartWeek")
  private int sWeek;

  @XmlElement(name = "EndWeek")
  private int eWeek;

  @XmlElement(name = "Pno12")
  private String p12;

  private FeatureList featureList;

  private OptionList optionList;

  public InteriorResponse() {}

  public InteriorResponse(int startWeek, int endWeek, String pno12) {
    super();
    this.sWeek = startWeek;
    this.eWeek = endWeek;
    this.p12 = pno12;
  }

  public int getStartWeek() {
    return sWeek;
  }

  public void setStartWeek(int startWeek) {
    this.sWeek = startWeek;
  }

  public int getEndWeek() {
    return eWeek;
  }

  public void setEndWeek(int endWeek) {
    this.eWeek = endWeek;
  }

  public String getPno12() {
    return p12;
  }

  public void setPno12(String pno12) {
    this.p12 = pno12;
  }

  @XmlElement(name = "FeatureList")
  public FeatureList getFeatureList() {
    return featureList;
  }

  public void setFeatureList(FeatureList featureList) {
    this.featureList = featureList;
  }

  @XmlElement(name = "OptionList")
  public OptionList getOptionList() {
    return optionList;
}

public void setOptionList(OptionList optionList) {
    this.optionList = optionList;
}

@Override
  public String toString() {
    return "InteriorResponse{"
        + "sWeek="
        + sWeek
        + ", eWeek="
        + eWeek
        + ", p12='"
        + p12
        + '\''
        + ", featureList="
        + featureList
        + '}';
  }
}

并将内部响应类更新为：-

    public class OptionList {

    private List<Option> options;

    @XmlElement(name = "Option")
    public List<Option> getOptions() {
        return options;
    }

    public void setOptions(List<Option> options) {
        this.options = options;
    }
}

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

@XmlRootElement(name = "Features_res")
public class InteriorResponse {

  @XmlElement(name = "StartWeek")
  private int sWeek;

  @XmlElement(name = "EndWeek")
  private int eWeek;

  @XmlElement(name = "Pno12")
  private String p12;

  private FeatureList featureList;

  private OptionList optionList;

  public InteriorResponse() {}

  public InteriorResponse(int startWeek, int endWeek, String pno12) {
    super();
    this.sWeek = startWeek;
    this.eWeek = endWeek;
    this.p12 = pno12;
  }

  public int getStartWeek() {
    return sWeek;
  }

  public void setStartWeek(int startWeek) {
    this.sWeek = startWeek;
  }

  public int getEndWeek() {
    return eWeek;
  }

  public void setEndWeek(int endWeek) {
    this.eWeek = endWeek;
  }

  public String getPno12() {
    return p12;
  }

  public void setPno12(String pno12) {
    this.p12 = pno12;
  }

  @XmlElement(name = "FeatureList")
  public FeatureList getFeatureList() {
    return featureList;
  }

  public void setFeatureList(FeatureList featureList) {
    this.featureList = featureList;
  }

  @XmlElement(name = "OptionList")
  public OptionList getOptionList() {
    return optionList;
}

public void setOptionList(OptionList optionList) {
    this.optionList = optionList;
}

@Override
  public String toString() {
    return "InteriorResponse{"
        + "sWeek="
        + sWeek
        + ", eWeek="
        + eWeek
        + ", p12='"
        + p12
        + '\''
        + ", featureList="
        + featureList
        + '}';
  }
}

我没有选择权。选项空

xml总量真的很大。我仍然想一部分一部分地尝试自己制作的部分

您需要根据XML结构设计类。找到下面的类

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

@XmlRootElement(name = "Features_res")
public class InteriorResponse {

  @XmlElement(name = "StartWeek")
  private int sWeek;

  @XmlElement(name = "EndWeek")
  private int eWeek;

  @XmlElement(name = "Pno12")
  private String p12;

  private FeatureList featureList;

  private OptionList optionList;

  public InteriorResponse() {}

  public InteriorResponse(int startWeek, int endWeek, String pno12) {
    super();
    this.sWeek = startWeek;
    this.eWeek = endWeek;
    this.p12 = pno12;
  }

  public int getStartWeek() {
    return sWeek;
  }

  public void setStartWeek(int startWeek) {
    this.sWeek = startWeek;
  }

  public int getEndWeek() {
    return eWeek;
  }

  public void setEndWeek(int endWeek) {
    this.eWeek = endWeek;
  }

  public String getPno12() {
    return p12;
  }

  public void setPno12(String pno12) {
    this.p12 = pno12;
  }

  @XmlElement(name = "FeatureList")
  public FeatureList getFeatureList() {
    return featureList;
  }

  public void setFeatureList(FeatureList featureList) {
    this.featureList = featureList;
  }

  @XmlElement(name = "OptionList")
  public OptionList getOptionList() {
    return optionList;
  }

  public void setOptionList(OptionList optionList) {
    this.optionList = optionList;
  }

  @Override
  public String toString() {
    return "InteriorResponse{"
        + "sWeek="
        + sWeek
        + ", eWeek="
        + eWeek
        + ", p12='"
        + p12
        + '\''
        + ", featureList="
        + featureList
        + ", optionList="
        + optionList
        + '}';
  }
}

特征对象的类

import javax.xml.bind.annotation.XmlElement;

public class Feature {

  @XmlElement(name = "Code")
  private String code_;

  public String getCode() {
    return code_;
  }

  public void setCode(String code) {
    this.code_ = code;
  }

  @Override
  public String toString() {
    return "Feature{" + "code_='" + code_ + '\'' + '}';
  }
}

特性列表的类

import javax.xml.bind.annotation.XmlElement;
import java.util.List;

public class FeatureList {

  private List<Feature> features;

  @XmlElement(name = "Feature")
  public List<Feature> getFeatures() {
    return features;
  }

  public void setFeatures(List<Feature> features) {
    this.features = features;
  }
}

我对JAXB的东西知之甚少。我从Sambit身上学到了很多东西，他给了我很多帮助，并给了我开始使用JAXB的方法。后来，我用更少的Java类和更智能地使用JAXB注释实现了我的版本

我的InteriorResponse类版本：-

    import java.util.List;

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

@XmlRootElement(name = "Features_res")
public class InteriorResponse {

    @XmlElement(name = "StartWeek")
    private int startWeek;

    @XmlElement(name = "EndWeek")
    private int endWeek;

    @XmlElement(name = "Pno12")
    private String pno12;

    @XmlElementWrapper(name = "FeatureList")
    @XmlElement(name = "Feature")
    private List<Feature> featureList;

    @XmlElementWrapper(name = "OptionList")
    @XmlElement(name = "Option")
    private List<String> optionList;

    public InteriorResponse() {
    }

    public InteriorResponse(int startWeek, int endWeek, String pno12) {
        super();
        this.startWeek = startWeek;
        this.endWeek = endWeek;
        this.pno12 = pno12;
    }

    @XmlTransient
    public int getStartWeek() {
        return startWeek;
    }

    public void setStartWeek(int startWeek) {
        this.startWeek = startWeek;
    }

    @XmlTransient
    public int getEndWeek() {
        return endWeek;
    }

    public void setEndWeek(int endWeek) {
        this.endWeek = endWeek;
    }

    @XmlTransient
    public String getPno12() {
        return pno12;
    }

    public void setPno12(String pno12) {
        this.pno12 = pno12;
    }

    @XmlTransient
    public List<Feature> getFeatureList() {
        return featureList;
    }

    public void setFeatureList(List<Feature> featureList) {
        this.featureList = featureList;
    }

    @XmlTransient
    public List<String> getOptionList() {
        return optionList;
    }

    public void setOptionList(List<String> optionList) {
        this.optionList = optionList;
    }

    @Override
    public String toString() {
        return "InteriorResponse{" + "sWeek=" + startWeek + ", eWeek=" + endWeek + ", pno12='" + pno12 + '\'' + ", featureList=" + featureList + ", optionList="
            + optionList + '}';
    }
}

请注意，FeatureList和OptionList不需要任何额外的包装器类。这可以通过JAXB注释@xmlementwrapper（name=“FeatureList”）完成。同时，这也是一个非常重要的教训。我们必须将所有属性的getter方法标记为@xmltransive。否则，JAXB将抛出一个异常2属性，该属性具有相同的名称。因为我们的类的所有属性对JAXB都是可见的。所以我们必须将一个标记为@xmltransive

在我看来，这是一个比公认的答案更好的解决办法。我把一切归功于桑比特。我相信这会帮助别人

你能在这里发布完整的xml内容吗？你提供的xml内容格式不正确，你可以检查一下。对不起，现在已经满了。我错过了上一个结束标记。保存后，它不会添加。但在预览中，它对我来说很好。让我再试一次，现在好了。请看一看，它工作得很好。你能告诉我为什么我不能拥有与XML标记名相同的变量名吗？请检查更新的问题好吗？如果我理解你的问题，变量名可以是任何东西，但你必须在XMlElement注释中提供XML标记的名称。请检查更新的问题中是否有额外部分，如下所示：“001048 000050 000790”为此，我按照您的方法制作了2个新的类OptionList和Option。但我的代码中的Option为null。一定是出了问题。额外部分与“

T001

T002

“这是2级，但是1级。由于缺少JAXBY，我不能这样做。您也可以尝试将FeatureList类型的对象作为OptionList的对象，其中包含另一个对象作为选项。

    <Features_res>
    <StartWeek>202017</StartWeek>
    <EndWeek>202035</EndWeek>
    <Pno12>ABCDEEB</Pno12>

    <FeatureList>
        <Feature>
            <Code>T002</Code>
        </Feature>
        <Feature>
            <Code>T002</Code>
        </Feature>
    </FeatureList>

    <OptionList>
        <Option>001048</Option>
        <Option>000050</Option>
        <Option>000790</Option>
    </OptionList>
</Features_res>

    import java.util.List;

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

@XmlRootElement(name = "Features_res")
public class InteriorResponse {

    @XmlElement(name = "StartWeek")
    private int startWeek;

    @XmlElement(name = "EndWeek")
    private int endWeek;

    @XmlElement(name = "Pno12")
    private String pno12;

    @XmlElementWrapper(name = "FeatureList")
    @XmlElement(name = "Feature")
    private List<Feature> featureList;

    @XmlElementWrapper(name = "OptionList")
    @XmlElement(name = "Option")
    private List<String> optionList;

    public InteriorResponse() {
    }

    public InteriorResponse(int startWeek, int endWeek, String pno12) {
        super();
        this.startWeek = startWeek;
        this.endWeek = endWeek;
        this.pno12 = pno12;
    }

    @XmlTransient
    public int getStartWeek() {
        return startWeek;
    }

    public void setStartWeek(int startWeek) {
        this.startWeek = startWeek;
    }

    @XmlTransient
    public int getEndWeek() {
        return endWeek;
    }

    public void setEndWeek(int endWeek) {
        this.endWeek = endWeek;
    }

    @XmlTransient
    public String getPno12() {
        return pno12;
    }

    public void setPno12(String pno12) {
        this.pno12 = pno12;
    }

    @XmlTransient
    public List<Feature> getFeatureList() {
        return featureList;
    }

    public void setFeatureList(List<Feature> featureList) {
        this.featureList = featureList;
    }

    @XmlTransient
    public List<String> getOptionList() {
        return optionList;
    }

    public void setOptionList(List<String> optionList) {
        this.optionList = optionList;
    }

    @Override
    public String toString() {
        return "InteriorResponse{" + "sWeek=" + startWeek + ", eWeek=" + endWeek + ", pno12='" + pno12 + '\'' + ", featureList=" + featureList + ", optionList="
            + optionList + '}';
    }
}

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

public class Feature {

    @XmlElement(name = "Code")
    private String code;

    @XmlTransient
    public String getCode() {
        return code;
    }

    public void setCode(String code) {
        this.code = code;
    }

    @Override
    public String toString() {
        return "Feature{" + "code_='" + code + '\'' + '}';
    }
}