问题

我对Jackson XML还不熟悉，我有一个要求，需要构造一个具有不同元素名称和属性但位于同一根元素下的Jackson XML。

**我期望的xml输出**

<item name="Whatever">
<problem_id id="12312"/>
<problem_type type="1765"/>
<problem_desc desc="faulty"/>
</item>

**我的POJO类**（不确定如何添加剩余的元素和属性）

```java
@JacksonXmlRootElement(localName = "item")
public class ItemsDTO {

	 @JacksonXmlProperty(localName = "name",isAttribute = true)
	 private String name="Whatever";

}

非常感谢任何建议。

<details>
<summary>英文:</summary>

I&#39;m new to Jackson XML and I have a requirement of constructing a Jackson XML with different element name and attributes but under same root element. 

**My Expected xml output**

<item name="Whatever">
<problem_id id="12312"/>
<problem_type type="1765"/>
<problem_desc desc="faulty"/>
</item>

**My pojo class** ( Not sure how to add the remaining elements and attributes)

@JacksonXmlRootElement(localName = "item")
public class ItemsDTO {

 @JacksonXmlProperty(localName = "name",isAttribute = true)
 private String name="Whatever";

}

Any advise would be much appreciated.



</details>


# 答案1
**得分**: 0

为了实现这一点，您可能需要像您已经做过的那样实现更多的类，然后将相关的属性添加到您的容器类`ItemsDTO`中：

```java
import com.fasterxml.jackson.dataformat.xml.annotation.JacksonXmlProperty;
import com.fasterxml.jackson.dataformat.xml.annotation.JacksonXmlRootElement;

@JacksonXmlRootElement(localName = "item")
public class ItemsDTO {

    @JacksonXmlProperty(isAttribute = true)
    private String name = "Whatever";

    @JacksonXmlProperty(localName = "problem_id")
    private ProblemId problemId = new ProblemId();

    @JacksonXmlProperty(localName = "problem_type")
    private ProblemType problemType = new ProblemType();

    @JacksonXmlProperty(localName = "problem_desc")
    private ProblemDesc problemDesc = new ProblemDesc();
}

class ProblemId {
    @JacksonXmlProperty(isAttribute = true)
    private int id = 12312;
}

class ProblemType {
    @JacksonXmlProperty(isAttribute = true)
    private int type = 1765;
}

class ProblemDesc {
    @JacksonXmlProperty(isAttribute = true)
    private String desc = "faulty";
}

import com.fasterxml.jackson.dataformat.xml.annotation.JacksonXmlProperty;
import com.fasterxml.jackson.dataformat.xml.annotation.JacksonXmlRootElement;

@JacksonXmlRootElement(localName = "item")
public class ItemsDTO {

    @JacksonXmlProperty(isAttribute = true)
    private String name = "Whatever";

    @JacksonXmlProperty(localName = "problem_id")
    private ProblemId problemId = new ProblemId();

    @JacksonXmlProperty(localName = "problem_type")
    private ProblemType problemType = new ProblemType();

    @JacksonXmlProperty(localName = "problem_desc")
    private ProblemDesc problemDesc = new ProblemDesc();
}

class ProblemId {
    @JacksonXmlProperty(isAttribute = true)
    private int id = 12312;
}

class ProblemType {
    @JacksonXmlProperty(isAttribute = true)
    private int type = 1765;
}

class ProblemDesc {
    @JacksonXmlProperty(isAttribute = true)
    private String desc = "faulty";
}

答案2

得分: 0

虽然将 problem 的属性“封装”在一个单独的元素中，以更短的 XML 输出为佳，就像这样：

<item name="Whatever">
  <problem id="12312" type="1765" desc="faulty"/>
</item>

可以通过以下代码实现：

@JacksonXmlRootElement(localName = "item")
public class ItemDTO {

    @JacksonXmlProperty(isAttribute = true)
    private String name = "Whatever";

    @JacksonXmlProperty
    private Problem problem = new Problem();
}

class Problem {
    @JacksonXmlProperty(isAttribute = true)
    private int id = 12312;

    @JacksonXmlProperty(isAttribute = true)
    private int type = 1765;

    @JacksonXmlProperty(isAttribute = true)
    private String desc = "faulty";
}

<item name="Whatever">
  <problem id="12312" type="1765" desc="faulty"/>
</item>

@JacksonXmlRootElement(localName = "item")
public class ItemDTO {

    @JacksonXmlProperty(isAttribute = true)
    private String name = "Whatever";

    @JacksonXmlProperty
    private Problem problem = new Problem();
}

class Problem {
    @JacksonXmlProperty(isAttribute = true)
    private int id = 12312;

    @JacksonXmlProperty(isAttribute = true)
    private int type = 1765;

    @JacksonXmlProperty(isAttribute = true)
    private String desc = "faulty";
}