在回答这个问题时How to read values from XML Request and write into XML Response using Groovy?与 namespace (SOAP) 有关 XmlSlurper和 XmlParser , 我意识到默认情况下我实际上无法判断它们是否非命名空间感知。

虽然文档这样说(默认情况下不识别命名空间):

XmlSlurper

XmlSlurper ()

Creates a non-validating and non-namespace-aware XmlSlurper which does not allow DOCTYPE declarations in documents.

XmlParser

XmlParser ()

Creates a non-validating and non-namespace-aware XmlParser which does not allow DOCTYPE declarations in documents.

代码恰恰相反(默认命名空间感知):

XmlSlurper :

public XmlSlurper() throws ParserConfigurationException, SAXException {
    this(false, true);
}

XmlParser :

public XmlParser() throws ParserConfigurationException, SAXException {
    this(false, true);
}

我也发现了这个answer声称 XMLSlurper 默认情况下是非 namespace 感知的。

最佳答案

我认为文档是错误的，XmlSlurper 和 XmlParser 默认是 namespace-aware:

def text = '''<person xmlns:city="http://localhost/">
    <name>jalopaba</name>
    <city:name>Valladolid</city:name>
</person>'''

// XmlSlurper is namespace aware, since new XmlSlurper() --> new XmlSlurper(false, true)
def slurped_person = new XmlSlurper().parseText(text)
assert 'jalopabaValladolid' == slurped_person.name.text() // :name and :name from city
assert 'jalopaba' == slurped_person.':name'.text() // aware of default namespace
assert '' == slurped_person.'city:name'.text() // city namespace not declared

// but you need to make the resulting GPathResult aware of the concrete namespace
slurped_person = new XmlSlurper().parseText(text).declareNamespace([city: 'http://localhost/'])
assert 'jalopabaValladolid' == slurped_person.name.text() // :name and :name from city
assert 'jalopaba' == slurped_person.':name'.text() // aware of default namespace
assert 'Valladolid' == slurped_person.'city:name'.text() // city namespace declared

// If you make XmlSlurper not namespace aware, it uses the whole element string
slurped_person = new XmlSlurper(false, false).parseText(text)
assert 'jalopaba' == slurped_person.name.text() // just element 'name'
assert '' == slurped_person.':name'.text() // not aware of default namespace
assert 'Valladolid' == slurped_person.'city:name'.text() // using the whole element string (it seems to be namespace aware, but it's not)

// And when it is not namespace aware, nothing changes declaring namespaces
slurped_person = new XmlSlurper(false, false).parseText(text).declareNamespace([city: 'http://localhost/'])
assert 'jalopaba' == slurped_person.name.text() // just element 'name'
assert '' == slurped_person.':name'.text() // not aware of default namespace
assert 'Valladolid' == slurped_person.'city:name'.text() // using the whole element string (it seems to be namespace aware, but it's not)

def c = new Namespace('http://localhost/', 'city')
assert c.name instanceof QName // => new QName('http://localhost/', 'name', 'city')

// XmlParser is namespace aware, since new XmlParser() --> new XmlParser(false, true)
def parsed_person = new XmlParser().parseText(text)
assert parsed_person.toString() == 'person[attributes={}; value=[name[attributes={}; value=[jalopaba]], {http://localhost/}name[attributes={}; value=[Valladolid]]]]'
assert 'jalopaba' == parsed_person.name.text() // default namespace
assert 'jalopaba' == parsed_person[new QName('name')].text() // default namespace
assert 'jalopabaValladolid' == parsed_person[new QName('http://localhost/', 'name')].text() // aware of namespace and empty string as prefix
assert 'Valladolid' == parsed_person[new QName('http://localhost/', 'name', 'it_does_not_matter')].text() // aware of namespace, prefix does not matter
assert '' == parsed_person[new QName('http://wrong_namespace/', 'name', 'city')].text() // aware of namespace, wrong URI with good prefix gets nothing
assert 'Valladolid' == parsed_person[c.name].text()
assert 'Valladolid' == parsed_person.'city:name'.text() // using the whole element string

// With XmlParser not namespace aware...
parsed_person = new XmlParser(false, false).parseText(text)
assert parsed_person.toString() == 'person[attributes={xmlns:city=http://localhost/}; value=[name[attributes={}; value=[jalopaba]], city:name[attributes={}; value=[Valladolid]]]]'
assert 'jalopaba' == parsed_person.name.text()
assert 'jalopaba' == parsed_person[new QName('name')].text()
assert 'jalopaba' == parsed_person[new QName('http://localhost/', 'name')].text() // ignores namespace, only uses 'name' string
assert '' == parsed_person[new QName('http://localhost/', 'name', 'wrong_prefix')].text() // not aware of namespace, the only important thing is prefix
assert 'Valladolid' == parsed_person[new QName('http://wrong_namespace/', 'name', 'city')].text() // wrong namespace but not aware, the only important thing is prefix
assert 'Valladolid' == parsed_person[c.name].text()
assert 'Valladolid' == parsed_person.'city:name'.text()

关于xml - 默认情况下 XmlParser 和 XmlSlurper 命名空间是否感知？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/33418826/