Java 解析xml时使用内部标记的困难

我有以下xml：

<fitness>
<group id="1" name = "firstGroup">

    <exercises id="1" name = "exercise1">
        <implementation> Hw
            </implementation>
      <videoUrl> APGw5Xi8xfQ </videoUrl>
    </exercises>

    </group>


    <group id = "2" name = "group2">

        <exercises id = "5" name = "exercise5">
            <implementation>just do it</implementation>
            <videoUrl>let's see it</videoUrl>
        </exercises>

    </group>

    <group id  = "3" name = "group3">
        <exercises id = "6" name = "exercise6">
            <implementation>just do it</implementation>
            <videoUrl>let's see it</videoUrl>
        </exercises>

    </group>
</fitness>

但我需要：

 1
Exercise :exercise1, id:1
----------------------------
2
Exercise :exercise5, id:2
----------------------------
3
Exercise :exercise6, id:3

---

而不是

NodeList exercises=doc.getElementsByTagName（“exercises”）

，您应该使用

NodeList exercises=groupElement.getElementsByTagName（“exercises”）

这样，您将只在
中检索

 1
 Exercise :exercise1, id:1
 Exercise :exercise5, id:1
 Exercise :exercise6, id:1
 ----------------------------
 2
 Exercise :exercise1, id:2
 Exercise :exercise5, id:2
 Exercise :exercise6, id:2
 ----------------------------
 3
 Exercise :exercise1, id:3
 Exercise :exercise5, id:3
 Exercise :exercise6, id:3

 1
Exercise :exercise1, id:1
----------------------------
2
Exercise :exercise5, id:2
----------------------------
3
Exercise :exercise6, id:3