问题描述
我是Groovy的新手,并且陷入了一个简单的问题。我想要做的就是从一个XML文件中提取某些元素,并用它创建一个新文件。下面是一个XML示例,让我们使用Maven pom文件:
< project>
< modelVersion> 4.0.0< / modelVersion>
< groupId> com.group< / groupId>
< artifactId>工件< / artifactId>
< version> 1.4< / version>
< dependencyManagement>
<依赖关系>
< dependency>
< groupId> junit< / groupId>
< artifactId> junit< / artifactId>
< version> 4.8.2< / version>
< scope> test< / scope>
< /依赖关系>
< /依赖关系>
< / dependencyManagement>
我知道如何解析XML在Groovy中:
$ b $ pre $ def project = new XmlParser()。parse(pom.xml)
project.groupId .each {
println it.text()
}
我也知道如何在Groovy中创建XML:
def xml = new groovy.xml.MarkupBuilder()
xml.project ){
modelVersion(artifactId)
groupId(com.group)
artifactId(artifact)
}
然而,我认为将这两者结合起来存在问题。例如,我想要 groupId , artifactId 和整个依赖关系树,并从中创建一个新的XML。
这不是那么难,我想要使用Groovy的简单性。
有些东西(当然这不行): / p>
def newXml = new groovy.xml.MarkupBuilder()
newXml.groupId = project.groupId
newXml .dependencies = project.dependencyManagement.dependencies
谢谢。这段代码有很多帮助,但是我该如何处理名称空间,即如果输入中的项目标签如下所示:
<< ; project xmlns =http://maven.apache.org/POM/4.0.0xmlns:xsi =http://www.w3.org/2001/XMLSchema-instancexsi:schemaLocation =http:/ /maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd\">
然后在输出中添加一些奇怪的注释。我想要的就是输出中的项目标签也是这样。 你可以用 XmlSlurper
:
import groovy.xml。*
def pxml ='''< project>
| < modelVersion> 4.0.0< / modelVersion>
| <&的groupId GT; com.group< /&的groupId GT;
| < artifactId的>伪影< / artifactId的>
| <版本> 1.4< /版本>
| < dependencyManagement>
| <依赖性>
| <依赖性>
| <&的groupId GT; junit的< /&的groupId GT;
| < artifactId的> junit的< / artifactId的>
| <版本> 4.8.2< /版本>
| <范围>试验< /范围>
| < /依赖性>
| < /依赖性>
| < / dependencyManagement>
|< / project>'''stripMargin()
def p = new XmlSlurper()。parseText(pxml)
String nxml = new StreamingMarkupBuilder ().bind {
project {
dependecyManagement {
dependencies {
mkp.yield p.dependencyManagement.dependencies.children()
}
}
println XmlUtil.serialize(nxml)
<?xml version =1.0encoding =UTF-8?>
< project>
< dependecyManagement>
<依赖关系>
< dependency>
< groupId> junit< / groupId>
< artifactId> junit< / artifactId>
< version> 4.8.2< / version>
< scope> test< / scope>
< /依赖关系>
< /依赖关系>
< / dependecyManagement>
< / project>
要更好地处理名称空间,您可以尝试:
def pxml ='''< project xmlns =http://maven.apache.org/POM/4.0.0
| xmlns:xsi =http://www.w3.org/2001/XMLSchema-instance
| xsi:schemaLocation =http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd\">
| < modelVersion> 4.0.0< / modelVersion>
| <&的groupId GT; com.group< /&的groupId GT;
| < artifactId的>伪影< / artifactId的>
| <版本> 1.4< /版本>
| < dependencyManagement>
| <依赖性>
| <依赖性>
| <&的groupId GT; junit的< /&的groupId GT;
| < artifactId的> junit的< / artifactId的>
| <版本> 4.8.2< /版本>
| <范围>试验< /范围>
| < /依赖性>
| < /依赖性>
| < / dependencyManagement>
|< / project>'''stripMargin()
def p = new XmlSlurper()。parseText(pxml)
String nxml = new StreamingMarkupBuilder ().bind {
mkp.declareNamespace('':http://maven.apache.org/POM/4.0.0,
'xsi':http://www.w3 ('xsi:schemaLocation':p。@ schemaLocation){
dependecyManagement {
dependencies {
mkp.yield p.dependencyManagement .dependencies.children()
}
}
}
}
println XmlUtil.serialize(nxml)
$ c $ < / p> > ;?xml version =1.0encoding =UTF-8?>
< project xmlns =http://maven.apache.org/POM/4.0.0xmlns:xsi =http://www.w3.org/2001/XMLSchema-instancexsi:schemaLocation =http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd\">
< dependecyManagement>
<依赖关系>
< dependency>
< groupId> junit< / groupId>
< artifactId> junit< / artifactId>
< version> 4.8.2< / version>
< scope> test< / scope>
< /依赖关系>
< /依赖关系>
< / dependecyManagement>
< / project>
I am new to Groovy and am stuck with a simple problem. All I wanna do is extract certain elements from one XML file and created a new file with it. Here's an example XML, let's use a Maven pom file:
<project>
<modelVersion>4.0.0</modelVersion>
<groupId>com.group</groupId>
<artifactId>artifact</artifactId>
<version>1.4</version>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.8.2</version>
<scope>test</scope>
</dependency>
</dependencies>
</dependencyManagement>
I know how to parse XML in Groovy:
def project = new XmlParser().parse("pom.xml")
project.groupId.each{
println it.text()
}
I also know how to create XML in Groovy:
def xml = new groovy.xml.MarkupBuilder()
xml.project (){
modelVersion("artifactId")
groupId("com.group")
artifactId("artifact")
}
However, I seem to have a problem combining the two. I want, for example, take groupId, artifactId and the whole dependencies tree and create a new XML from it.It can't be that hard and I wanna make use of the Groovy simplicity.
Something along those lines (of course this does not work):
def newXml= new groovy.xml.MarkupBuilder()
newXml.groupId= project.groupId
newXml.dependencies = project.dependencyManagement.dependencies
Thanks. That code helped a lot but how can I handle the namespace, i.e. if the project tag in the input looks like that:
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
It is then adding some weird annotations to the output. All I want is that the project tag in the output looks like that as well.
解决方案 You can do this with XmlSlurper
:
import groovy.xml.*
def pxml = '''<project>
| <modelVersion>4.0.0</modelVersion>
| <groupId>com.group</groupId>
| <artifactId>artifact</artifactId>
| <version>1.4</version>
| <dependencyManagement>
| <dependencies>
| <dependency>
| <groupId>junit</groupId>
| <artifactId>junit</artifactId>
| <version>4.8.2</version>
| <scope>test</scope>
| </dependency>
| </dependencies>
| </dependencyManagement>
|</project>'''.stripMargin()
def p = new XmlSlurper().parseText( pxml )
String nxml = new StreamingMarkupBuilder().bind {
project {
dependecyManagement {
dependencies {
mkp.yield p.dependencyManagement.dependencies.children()
}
}
}
}
println XmlUtil.serialize( nxml )
Which prints:
<?xml version="1.0" encoding="UTF-8"?>
<project>
<dependecyManagement>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.8.2</version>
<scope>test</scope>
</dependency>
</dependencies>
</dependecyManagement>
</project>
To handle the namespaces better, you could try:
def pxml = '''<project xmlns="http://maven.apache.org/POM/4.0.0"
| xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
| xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
| <modelVersion>4.0.0</modelVersion>
| <groupId>com.group</groupId>
| <artifactId>artifact</artifactId>
| <version>1.4</version>
| <dependencyManagement>
| <dependencies>
| <dependency>
| <groupId>junit</groupId>
| <artifactId>junit</artifactId>
| <version>4.8.2</version>
| <scope>test</scope>
| </dependency>
| </dependencies>
| </dependencyManagement>
|</project>'''.stripMargin()
def p = new XmlSlurper().parseText( pxml )
String nxml = new StreamingMarkupBuilder().bind {
mkp.declareNamespace( '':"http://maven.apache.org/POM/4.0.0",
'xsi':"http://www.w3.org/2001/XMLSchema-instance" )
project( 'xsi:schemaLocation':p.@schemaLocation ) {
dependecyManagement {
dependencies {
mkp.yield p.dependencyManagement.dependencies.children()
}
}
}
}
println XmlUtil.serialize( nxml )
Which should give you:
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<dependecyManagement>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.8.2</version>
<scope>test</scope>
</dependency>
</dependencies>
</dependecyManagement>
</project>
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