xml - 根据 XSD 模式验证 XML 并使用 groovy 捕获验证器期望

Question

def validateXml(xml){

    String xsd = "src/main/ressources/fulltext-documents-v1.2.3.xsd"

    def factory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI)
    def schema = factory.newSchema(new StreamSource(new File(xsd)))
    def validator = schema.newValidator()
    validator.validate(new StreamSource(new StringReader(xml)))
}

这是我用来验证 xml 文档的字符串表示形式的函数。在另一个捕获验证器可能引发的异常的函数下面

def xmlVerification(xml) {

    Node rootNode = new XmlParser().parseText(xml)
    def stringXml = XmlUtil.serialize(rootNode)

    try{
        validateXml(stringXml)
        println "no error in text"
    }catch(SAXParseException e){
        println "column number "+e.getColumnNumber()
        println "line number"+e.getLineNumber()
    }
}

现在它只显示引发异常的列号和行号(目前对我来说已经足够了)。

现在，假设我的文档至少有 2 个错误。我希望得到这 2 个错误(例如在表格中)然后处理它们。使用我的代码，它会在出现第一个异常时停止，所以我无法处理这两个错误。我必须更正第一个才能更正第二个(通过第二次重新运行我的代码)。

知道如何浏览整个文档、存储所有异常并在 .each{} 循环或类似的东西中处理它们吗？

希望已经够清楚了

提前致谢!

Answer 1

这应该做你想做的:

import org.xml.sax.ErrorHandler
import static javax.xml.XMLConstants.W3C_XML_SCHEMA_NS_URI
import javax.xml.transform.stream.StreamSource
import javax.xml.validation.Schema
import javax.xml.validation.SchemaFactory
import javax.xml.validation.Validator

List findProblems( File xml, File xsd ) {
  SchemaFactory factory = SchemaFactory.newInstance( W3C_XML_SCHEMA_NS_URI )
  Schema schema = factory.newSchema( new StreamSource( xsd ) )
  Validator validator = schema.newValidator()
  List exceptions = []
  Closure<Void> handler = { exception -> exceptions << exception }
  validator.errorHandler = [ warning:    handler,
                             fatalError: handler,
                             error:      handler ] as ErrorHandler
  validator.validate( new StreamSource( xml ) )
  exceptions
}

// Two files I got for testing
File xml = new File( 'books.xml' )
File xsd = new File( 'books.xsd' )

// Call the method, and print out each exception
findProblems( xml, xsd ).each {
  println "Problem @ line $it.lineNumber, col $it.columnNumber : $it.message"
}

或者稍微更理想化的 groovy 版本是:

import org.xml.sax.ErrorHandler
import static javax.xml.XMLConstants.W3C_XML_SCHEMA_NS_URI
import javax.xml.transform.stream.StreamSource
import javax.xml.validation.SchemaFactory

List findProblems( File xml, File xsd ) {
  SchemaFactory.newInstance( W3C_XML_SCHEMA_NS_URI )
               .newSchema( new StreamSource( xsd ) )
               .newValidator().with { validator ->
    List exceptions = []
    Closure<Void> handler = { exception -> exceptions << exception }
    errorHandler = [ warning: handler, fatalError: handler, error: handler ] as ErrorHandler
    validate( new StreamSource( xml ) )
    exceptions
  }
}