1

我正在使用 XOM 解析 xml 文件,但在获取Element字符串名称时遇到问题。我可以通过遍历getChild(x)where来访问每个元素x=0:ChildCount,但是不得不在有内置函数来完成此任务的软件周围破解我的方式似乎很愚蠢。为什么我要获得 NPE?请参阅下面的示例...我 100% 确定父母包含一个与我正在搜索的确切名称的孩子。我能做些什么来解决这个问题?

FileInputStream xmlFile = new FileInputStream("temp.xml");
Builder builder = new Builder();
Document doc = builder.build(xmlFile);
Element root = doc.getRootElement();

System.out.println(((Element)root.getChild(1)).getLocalName()); //--> prints "player"
Element player = root.getFirstChildElement(((Element)root.getChild(1)).getLocalName()); //--> null
System.out.println(player); //--> prints "null"
Element player_stats = player.getFirstChildElement("player_stats"); //--> NPE

临时文件

<?xml version="1.0" encoding="UTF-8"?>
<fantasy_content xml:lang="en-US"
yahoo:uri="http://fantasysports.yahooapis.com/fantasy/v2/player/nfl.p.7206/stats;type=week;week=2"
time="34.230947494507ms" copyright="Data provided by Yahoo! and STATS, LLC"
refresh_rate="31" xmlns:yahoo="http://www.yahooapis.com/v1/base.rng"
xmlns="http://fantasysports.yahooapis.com/fantasy/v2/base.rng">
<player>
    <player_key>331.p.7206</player_key>
    <player_id>7206</player_id>
    <name>
        <full>Heath Miller</full>
        <first>Heath</first>
        <last>Miller</last>
        <ascii_first>Heath</ascii_first>
        <ascii_last>Miller</ascii_last>
    </name>
    <injury_note>not injury related</injury_note>
    <editorial_player_key>nfl.p.7206</editorial_player_key>
    <editorial_team_key>nfl.t.23</editorial_team_key>
    <editorial_team_full_name>Pittsburgh Steelers</editorial_team_full_name>
    <editorial_team_abbr>Pit</editorial_team_abbr>
    <bye_weeks>
        <week>12</week>
    </bye_weeks>
    <uniform_number>83</uniform_number>
    <display_position>TE</display_position>
    <is_undroppable>0</is_undroppable>
    <position_type>O</position_type>
    <eligible_positions>
        <position>TE</position>
    </eligible_positions>
    <has_player_notes>1</has_player_notes>
    <player_stats>
        <coverage_type>week</coverage_type>
        <week>2</week>
        <stats>
            <stat>
                <stat_id>0</stat_id>
                <value>1</value>
            </stat>
            <stat>
                <stat_id>1</stat_id>
                <value>0</value>
            </stat>
            <stat>
                <stat_id>2</stat_id>
                <value>0</value>
            </stat>
            <stat>
                <stat_id>3</stat_id>
                <value>0</value>
            </stat>

            ...

            <stat>
                <stat_id>81</stat_id>
                <value>0</value>
            </stat>
        </stats>
    </player_stats>
</player>
</fantasy_content>

谢谢!

4

1 回答 1

1

终于想通了,发布问题后不久。为什么这似乎总是发生?

我需要的是 NameSpace 参数。我没有对其进行硬编码,而是检索了根节点的命名空间,并假设它的子节点的命名空间是相同的:

String nameSpace = root.getNamespaceURI();
// getChildElements
Element player = root.getFirstChildElement("player",nameSpace);
Element player_stats = player.getFirstChildElement("player_stats",nameSpace);

似乎 XOM 应该足够强大来处理这个问题,但我想它不是。

于 2015-01-08T03:29:41.080 回答