这是我的Groovy代码：
// ...
def xml = new XmlParser().parse(fileName)
xml.each { e ->
// some changes are being made to XML
xml.append("test","test me")
}
def writer = new FileWriter(newFileName)
new XmlNodePrinter(new PrintWriter(writer)).print(xml)
代码可以工作,但输出XML有很多不必要的空格.看起来我写文件时做错了.
PS.感谢蒂姆,这是它应该如何工作(上面例子的最后一行将替换为这三行)：
def printer = new XmlNodePrinter(new PrintWriter(writer)) printer.preserveWhitespace = true printer.print(xml)
如果您更换会发生什么：
def writer = new FileWriter(newFileName) new XmlNodePrinter(new PrintWriter(writer)).print(xml)
有：
new File( newFilename ).withWriter { out ->
printer = new XmlNodePrinter( out )
printer.preserveWhitespace = true
printer.print( xml )
}
– 编辑 –
正如所指出的,感觉它应该是preserveWhitespace = false,但是如果您尝试以下测试代码：
def x = """<langs type="current">
<language>Java</language>
<language>Groovy</language>
<language>JavaScript</language>
</langs>"""
def xml = new XmlParser().parseText( x )
xml.appendNode 'language','Ruby'
def printIt = { node,pw ->
println "With preserveWhitespace=$pw:"
def s = new StringWriter()
printer = new XmlNodePrinter( new PrintWriter( s ) )
printer.preserveWhitespace = pw
printer.print( xml )
println s
}
printIt xml,true
printIt xml,false
你得到输出：
With preserveWhitespace=true:
<langs type="current">
<language>Java</language>
<language>Groovy</language>
<language>JavaScript</language>
<language>Ruby</language>
</langs>
With preserveWhitespace=false:
<langs type="current">
<language>
Java
</language>
<language>
Groovy
</language>
<language>
JavaScript
</language>
<language>
Ruby
</language>
</langs>
