Groovy-将XmlSlurper与动态路径一起使用

是否可以使用任意路径访问Xml节点

例如：给定xml：

    <records>
      <bike name='Chopper' />
      <car name='HSV Maloo' make='Holden' year='2006'>
        <country>Australia</country>
        <record type='speed'>Production Pickup Truck with speed of 271kph</record>
      </car>
      <car name='P50' make='Peel' year='1962'>
        <country>Isle of Man</country>
        <record type='size'>Smallest Street-Legal Car at 99cm wide and 59 kg in weight</record>
      </car>
    </records>

一种方法是用来计算字符串

def xml = '''|    <records>
             |      <bike name='Chopper' />
             |      <car name='HSV Maloo' make='Holden' year='2006'>
             |        <country>Australia</country>
             |        <record type='speed'>Production Pickup Truck with speed of 271kph</record>
             |      </car>
             |      <car name='P50' make='Peel' year='1962'>
             |        <country>Isle of Man</country>
             |        <record type='size'>Smallest Street-Legal Car at 99cm wide and 59 kg in weight</record>
             |      </car>
             |    </records>'''.stripMargin()

// Make our GPathResult    
def slurper = new XmlSlurper().parseText( xml )

// Define our tests
def tests = [
  [ query:'bike.@name',     expected:'Chopper' ],
  [ query:'car[0].country', expected:'Australia' ]
]

// For each test
tests.each { test ->
  // assert that we get the expected result
  assert Eval.x( slurper, "x.$test.query" ) == test.expected
}

defxml=''''|
|      
|      
|澳大利亚
|速度为271公里/小时的生产皮卡车
|      
|      
|马恩岛
|最小的街道合法车辆，99厘米宽，59公斤重
|      
|''.stripMargin（）
//让我们的GPathResult
def slurper=new XmlSlurper（）.parseText（xml）
//定义我们的测试
def测试=[
[查询：'bike.@name'，应为'Chopper']，
[查询：'car[0]。国家/地区'，应为'Australia']
]
//每次测试
tests.each{test->
//断言我们得到了预期的结果
assert Eval.x（slurper，“x.$test.query”）==test.expected
}

事实上，尽管这很酷，但我真的不明白为什么会这样——特别是Eval中的令牌

$test

和

query

。为什么

$test

而不是

${test}

）？另外，

query

是否是针对

GPathResult

定义的方法？如果不是，它来自哪里？@MartyPitt

test

来自我们的

每个
函数，因此第一次循环它等于map
[查询：'bike.@name'，预期：'Chopper']
。因此，
“x.$test.query”
（与
“x.${test.query}”
）将被计算为字符串
“x.bike.@name”
Eval.x
将
x
设置为
slurper
实例，然后对表达式求值。然后，它对我们列表中的第二个地图再次执行相同的操作
[查询：'car[0].country'，预期：'Australia']
。。。希望这能解释吗？是的，非常清楚。昨晚一定很晚了！再次感谢。
def xml = '''|    <records>
             |      <bike name='Chopper' />
             |      <car name='HSV Maloo' make='Holden' year='2006'>
             |        <country>Australia</country>
             |        <record type='speed'>Production Pickup Truck with speed of 271kph</record>
             |      </car>
             |      <car name='P50' make='Peel' year='1962'>
             |        <country>Isle of Man</country>
             |        <record type='size'>Smallest Street-Legal Car at 99cm wide and 59 kg in weight</record>
             |      </car>
             |    </records>'''.stripMargin()

// Make our GPathResult    
def slurper = new XmlSlurper().parseText( xml )

// Define our tests
def tests = [
  [ query:'bike.@name',     expected:'Chopper' ],
  [ query:'car[0].country', expected:'Australia' ]
]

// For each test
tests.each { test ->
  // assert that we get the expected result
  assert Eval.x( slurper, "x.$test.query" ) == test.expected
}