我正在使用Java 8和XmlPath 1.0解析大型XML.我要提取测试名称,他的测量值和结果(通过或失败).
每个测试可以具有许多TestResult,其中包含两种类型的限制之一:
> SingleLimit,只有一个<限制比较器=“ XYZ”>
> LimitPair将始终具有两个限制
<tr:Test ID = "282" name = "DIP1-8 High">
<tr:Extension>
<ts:TsstepProperties>
...
</ts:TsstepProperties>
</tr:Extension>
<tr:Outcome value = "Passed" /> <!-- value -->
<tr:TestResult ID = "xyz" name = "TC 8.7.4 - Current breaker output J10:1-2"> <!-- name -->
<tr:TestLimits>
<tr:Limits>
<c:LimitPair operator = "AND">
<c:Limit comparator = "GE">
<!-- value -->
<c:Datum nonStandardUnit = "V" value = "2.8" xsi:type="ts:TS_double" flags = "0x0000"/>
</c:Limit>
<c:Limit comparator = "LE">
<!-- value -->
<c:Datum nonStandardUnit = "V" value = "3.5" xsi:type="ts:TS_double" flags = "0x0000"/>
</c:Limit>
</c:LimitPair>
</tr:Limits>
</tr:TestLimits>
</tr:TestResult>
</tr:Test>
目前,我正在使用这些路径来提取PairLimit测量值并创建包含值的String.
我的问题是我应该如何编写代码/ xPath来照顾一个测试中可能存在的许多TestResults.
我在一开始就认为Test只能具有PairLimit或SingleLimit,这是错误的.
我当前的代码正确地提取了所有值,但是当Test中有许多TestResults时,分配的测量值是不正确的.
例如,如果Test ID = 1包含3(三个)TestResult,那么在包含度量的最终String中,我将在第二个内部包含第一个Test的值,因为它将“覆盖”这些值.
private ArrayList<String> preparePairLimitPaths() {
final ArrayList<String> list = new ArrayList<>();
list.add("//Test[TestResult//LimitPair]/@name");
list.add("//Test/TestResult[TestLimits//LimitPair]/TestData/Datum/@value");
list.add("//Test/TestResult/TestLimits/Limits/LimitPair/Limit[*]/Datum/@value");
list.add("//Test/TestResult/TestLimits/Limits/LimitPair/Limit[*]/Datum/@value");
list.add("//Test[TestResult//TestLimits//LimitPair]/Outcome/@value");
return list;
}
for (String expr : preparePairLimitPaths) {
try {
final NodeList evaluate = (NodeList) xPath.evaluate(expr, parse, XPathConstants.NODESET);
for (int i = 0; i < evaluate.getLength(); i++) {
final String textContent = evaluate.item(i).getTextContent();
if (textContent != null && !textContent.isEmpty()) {
stringBuilder.append(textContent).append(";");
}
}
stringBuilder.append("@@@");
} catch (XPathExpressionException e) {
e.printstacktrace();
}
}
解决方法:
您可以只遍历每个测试,然后遍历每个TestResult,然后将逻辑与TestLimits等一起放置.
NodeList allTests = (NodeList) xPath.evaluate("/xml/Test", xmlDocument, XPathConstants.NODESET);
for (int i = 0; i < tests.getLength(); i++) {
Element singleTest = (Element) tests.item(i);
// Here, you can extract some values from your test like:
// testOutcome = xPath.evaluate("Outcome/@value", singleTest);
NodeList testResults = (NodeList) xPath.evaluate("TestResult",test, XPathConstants.NODESET);
for (int j=0; j<testResults.getLength(); j++) {
// Now you can iterate over all your testResults from test
// testResultName = xPath.evaluate("@name",testResults.item(j)));
}
}