将复杂XML转换为Java对象

我有一个xml，我想将由特定标记的子项形成的子xml保存到一个字符串中。 这是一个xml示例：

    <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<SampleDTO>
    <id>1</id>
    <someList>
        <someObject>
            <amount>32</amount>
            <id>1</id>
            <someDescription>I am a description</someDescription>
        </someObject>
        <someObject>
            <amount>66</amount>
            <id>2</id>
            <someDescription>I am another description</someDescription>
        </someObject>
        <someObject>
            <amount>78</amount>
            <id>13</id>
            <someDescription>Guess what? I am a description</someDescription>
        </someObject>
    </someList>
    <otherList>
        <otherObject>
            <flag>true</flag>
            <id>1</id>
            <otherDescription>Oh nice, a description</otherDescription>
        </otherObject>
    </otherList>
</SampleDTO>

1.
32
1.
我是一个描述
66
2.
我是另一个描述
78
13
你猜怎么着？我是一个描述
真的
1.
哦，很好，描述

---

例如，我希望通过传递“someList”将子xml元素和值保存到字符串中，因为接下来我将其反序列化为java对象

您的java类/对象应至少具有以下3个实例变量：

private int amount
private int id
private String description

---

然后使用一些xml解析库（eg），对于您迭代的每个

标记，初始化类的新对象，并将从xml解析的值（amount/id/description）分配给它，然后将每个新创建的对象添加到列表或数组等中。

有许多开源xml处理包可用。 我喜欢杰克逊。 这里是一个链接到

总结如下：

将Jackson依赖项添加到POM

创建表示xml结构的对象结构

创建一个XmlMapper

使用XmlMapper

---

使用JAXB解组器将xml文档转换为java对象。 首先，将JAXB依赖项添加到项目的类路径中

SampleDTO.java

@XmlRootElement
public class SampleDTO {
    private String id;
    private List<SomeList> someList;
    private List<OtherList> otherList;

    @XmlElement
    public String getId() {
        return id;
    }
    public void setId(String id) {
        this.id = id;
    }
    @XmlElement
    public List<SomeList> getSomeList() {
        return someList;
    }
    public void setSomeList(List<SomeList> someList) {
        this.someList = someList;
    }
    @XmlElement
    public List<OtherList> getOtherList() {
        return otherList;
    }
    public void setOtherList(List<OtherList> otherList) {
        this.otherList = otherList;
    }
}

OtherObject.java

@XmlRootElement
public class SomeObject {
    private String amount;
    private String id;
    private String someDescription;

    @XmlElement
    public String getAmount() {
        return amount;
    }
    public void setAmount(String amount) {
        this.amount = amount;
    }
    @XmlElement
    public String getId() {
        return id;
    }
    public void setId(String id) {
        this.id = id;
    }
    @XmlElement
    public String getSomeDescription() {
        return someDescription;
    }
    public void setSomeDescription(String someDescription) {
        this.someDescription = someDescription;
    }
}

@XmlRootElement
public class OtherObject {
    private String flag;
    private String id;
    private String otherDescription;

    @XmlElement
    public String getFlag() {
        return flag;
    }
    public void setFlag(String flag) {
        this.flag = flag;
    }
    @XmlElement
    public String getId() {
        return id;
    }
    public void setId(String id) {
        this.id = id;
    }
    @XmlElement
    public String getOtherDescription() {
        return otherDescription;
    }
    public void setOtherDescription(String otherDescription) {
        this.otherDescription = otherDescription;
    }
}

用JAXB解组

public class Main {
    public static void main(String[] args) {  
     try {
        File file = new File("file.xml");  
        JAXBContext jaxbContext = JAXBContext.newInstance(SampleDTO.class);  
        Unmarshaller jaxbUnmarshaller = jaxbContext.createUnmarshaller();  
        SampleDTO sampleDTO= (SampleDTO) jaxbUnmarshaller.unmarshal(file);  
      } catch (JAXBException e) {  
        e.printStackTrace();  
      }  
    }  
}

---

对不起，我重新编辑了，我看一下。我认为您需要一个XPath表达式来获取正确的子树，然后对其进行反序列化。如果你真的需要把它变成java对象。也许将其作为XML树读取和解析更容易。

@XmlRootElement
public class OtherObject {
    private String flag;
    private String id;
    private String otherDescription;

    @XmlElement
    public String getFlag() {
        return flag;
    }
    public void setFlag(String flag) {
        this.flag = flag;
    }
    @XmlElement
    public String getId() {
        return id;
    }
    public void setId(String id) {
        this.id = id;
    }
    @XmlElement
    public String getOtherDescription() {
        return otherDescription;
    }
    public void setOtherDescription(String otherDescription) {
        this.otherDescription = otherDescription;
    }
}

public class Main {
    public static void main(String[] args) {  
     try {
        File file = new File("file.xml");  
        JAXBContext jaxbContext = JAXBContext.newInstance(SampleDTO.class);  
        Unmarshaller jaxbUnmarshaller = jaxbContext.createUnmarshaller();  
        SampleDTO sampleDTO= (SampleDTO) jaxbUnmarshaller.unmarshal(file);  
      } catch (JAXBException e) {  
        e.printStackTrace();  
      }  
    }  
}