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java - 通过 XPath 表达式提取多个属性节点值的值

问题描述

如何通过 XPath 表达式提取多个属性节点的值？

一个示例 XML 文件是：

<tag1>
    <tag2>
        <tag3 id="1">
            <tage4>
                <tage4code code="1">
                    <tag5>
                        <tage4Value Day="14" Month="Oct" Year="2000" />
                    </tag5>
                    <tag5>
                        <tage4Value Month="Oct" Year="2001" />
                    </tag5>
                    <tag5>
                        <tage4Value Year="2002" />
                    </tag5>
                    <tag5>
                        <tage4Value Day="1" Month="Jan" Year="1999" />
                    </tag5>
                    <tag5>
                        <tage4Value Year="1940" />
                    </tag5>
                </tage4code>
            </tage4>
        </tag3>
    </tag2>
</tag1>

到目前为止，我有这个 XPath 字符串：

XPathExpression expr = xpath.compile("concat((/tag1/tag2/tag3[@id=1]/tage4/tage4code[@code=1]/tag5/tage4Value/@Day, '/' , /tag1/tag2/tag3[@id=1]/tage4/tage4code[@code=1]/tag5/tage4Value/@Month, '/', /tag1/tag2/tag3[@id=1]/tage4/tage4code[@code=1]/tag5/tage4Value/@Year)");
                     NodeList combination1 = (NodeList) expr.evaluate(doc, XPathConstants.NODESET);
                     for (int a = 0; a <= combination1.getLength(); a++) {
                            System.out.println("date : " + combination.item(a).getNodeValue());
                        }

我的预期结果

2000 年 10 月 14 日 2001 年 10 月 2002 年 1999 年 1 月 1940 年

有人可以帮助纠正我的 XPathExpression

标签： javaxpath

解决方案

XPath 2.0 解决方案：

tokenize(replace(replace(replace(substring-after(string-join(//tag5/*|//tag5//@*,","),","),",,","%"),","," ")," ","/"),"%")

输出 ：

String='14/Oct/2000'
String='Oct/2001'
String='2002'
String='1/Jan/1999'
String='1940'

XPath 1.0 解决方案：

concat(translate(normalize-space(concat((//tage4Value)[1]/@Day," ",(//tage4Value)[1]/@Month," ",(//tage4Value)[1]/@Year))," ","/"),"|",translate(normalize-space(concat((//tage4Value)[2]/@Day," ",(//tage4Value)[2]/@Month," ",(//tage4Value)[2]/@Year))," ","/"),"|",translate(normalize-space(concat((//tage4Value)[3]/@Day," ",(//tage4Value)[3]/@Month," ",(//tage4Value)[3]/@Year))," ","/"),"|",translate(normalize-space(concat((//tage4Value)[4]/@Day," ",(//tage4Value)[4]/@Month," ",(//tage4Value)[4]/@Year))," ","/"),"|",translate(normalize-space(concat((//tage4Value)[5]/@Day," ",(//tage4Value)[5]/@Month," ",(//tage4Value)[5]/@Year))," ","/"))

输出 ：

String='14/Oct/2000|Oct/2001|2002|1/Jan/1999|1940'

或使用新行分隔符：

concat(translate(normalize-space(concat((//tage4Value)[1]/@Day," ",(//tage4Value)[1]/@Month," ",(//tage4Value)[1]/@Year))," ","/"),codepoints-to-string(10),translate(normalize-space(concat((//tage4Value)[2]/@Day," ",(//tage4Value)[2]/@Month," ",(//tage4Value)[2]/@Year))," ","/"),codepoints-to-string(10),translate(normalize-space(concat((//tage4Value)[3]/@Day," ",(//tage4Value)[3]/@Month," ",(//tage4Value)[3]/@Year))," ","/"),codepoints-to-string(10),translate(normalize-space(concat((//tage4Value)[4]/@Day," ",(//tage4Value)[4]/@Month," ",(//tage4Value)[4]/@Year))," ","/"),codepoints-to-string(10),translate(normalize-space(concat((//tage4Value)[5]/@Day," ",(//tage4Value)[5]/@Month," ",(//tage4Value)[5]/@Year))," ","/"))

输出 ：

String='14/Oct/2000
Oct/2001
2002
1/Jan/1999
1940'

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