stream 相关问题

我正在尝试使用 Stax2 来编写带有转义特殊字符的属性的 xml 文件。当我试图实现这样的精确输出时：我正在尝试使用 Stax2 来编写带有转义特殊字符的属性的 xml 文件。当我试图实现这样的精确输出时： <elem1 att1="This 
 That" /> 但是当我使用通常的XMLStreamWriter时，输出是这样的： <elem1 att1="This &#x0A; That" /> 所以我用 Stax2 尝试了以下操作： import org.codehaus.stax2.{XMLOutputFactory2} import org.scalatest.funsuite.AnyFunSuite import java.io.{File, FileOutputStream} import javax.xml.stream.{XMLOutputFactory, XMLStreamWriter} class testStreamXML extends AnyFunSuite{ val file = new File("stax2test.xml") val fileOutputStream = new FileOutputStream(file) val outputFactory: XMLOutputFactory2 = XMLOutputFactory.newInstance().asInstanceOf[XMLOutputFactory2] //outputFactory.setProperty(XMLOutputFactory2.P_ATTR_VALUE_ESCAPER, true) val writer= outputFactory.createXMLStreamWriter(fileOutputStream) writer.writeStartDocument() writer.writeStartElement("elem1") writer.writeAttribute("att1", "This 
 That") writer.writeEndElement() writer.writeEndDocument() } 每当我尝试将属性 P_ATTR_VALUE_ESCAPER 设置为 true 或 false 时，我都会收到此错误： An exception or error caused a run to abort: class java.lang.Boolean cannot be cast to class org.codehaus.stax2.io.EscapingWriterFactory (java.lang.Boolean is in module java.base of loader 'bootstrap'; org.codehaus.stax2.io.EscapingWriterFactory is in unnamed module of loader 'app') java.lang.ClassCastException: class java.lang.Boolean cannot be cast to class org.codehaus.stax2.io.EscapingWriterFactory (java.lang.Boolean is in module java.base of loader 'bootstrap'; org.codehaus.stax2.io.EscapingWriterFactory is in unnamed module of loader 'app') at com.ctc.wstx.api.WriterConfig.setProperty(WriterConfig.java:401) at com.ctc.wstx.api.CommonConfig.setProperty(CommonConfig.java:100) at com.ctc.wstx.stax.WstxOutputFactory.setProperty(WstxOutputFactory.java:153) at testStreamXML3.<init>(testStreamXML3.scala:10) at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:64) at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:500) at java.base/java.lang.reflect.ReflectAccess.newInstance(ReflectAccess.java:128) at java.base/jdk.internal.reflect.ReflectionFactory.newInstance(ReflectionFactory.java:350) at java.base/java.lang.Class.newInstance(Class.java:645) at org.scalatest.tools.Runner$.genSuiteConfig(Runner.scala:1402) at org.scalatest.tools.Runner$.$anonfun$doRunRunRunDaDoRunRun$8(Runner.scala:1199) at scala.collection.immutable.List.map(List.scala:246) at org.scalatest.tools.Runner$.doRunRunRunDaDoRunRun(Runner.scala:1198) at org.scalatest.tools.Runner$.$anonfun$runOptionallyWithPassFailReporter$24(Runner.scala:993) at org.scalatest.tools.Runner$.$anonfun$runOptionallyWithPassFailReporter$24$adapted(Runner.scala:971) at org.scalatest.tools.Runner$.withClassLoaderAndDispatchReporter(Runner.scala:1480) at org.scalatest.tools.Runner$.runOptionallyWithPassFailReporter(Runner.scala:971) at org.scalatest.tools.Runner$.run(Runner.scala:798) at org.scalatest.tools.Runner.run(Runner.scala) at org.jetbrains.plugins.scala.testingSupport.scalaTest.ScalaTestRunner.runScalaTest2or3(ScalaTestRunner.java:38) at org.jetbrains.plugins.scala.testingSupport.scalaTest.ScalaTestRunner.main(ScalaTestRunner.java:25) 有什么建议如何解决这个问题吗？或者达到我转义属性中特殊字符的目的？您所指的属性确实需要一个 EscapingWriterFactory 类。这是文档：如果需要对属性值内容进行自定义输出转义，可以设置的属性。值集必须是类型逃离WriterFactory。设置后，工厂将用于创建每个写入器实例用于转义所有写入的属性值，两者通过显式 XMLStreamWriter.writeAttribute(java.lang.String, java.lang.String) 方法，以及通过复制方法 (XMLStreamWriter2.copyEventFromReader(org.codehaus.stax2.XMLStreamReader2, 布尔值））。 [1] 关于如何实现“个人”逃避该工厂的实施的问题就可以完成这项工作。这是一个使用给定编写器的简单实现（受 [2] 启发），无需应用任何转义 - 这可能是您想要解决的任何特殊用例的起点： class CustomXmlEscapingWriterFactory extends EscapingWriterFactory{ override def createEscapingWriterFor(writer: Writer, s: String): Writer = new Writer(){ override def write(cbuf: Array[Char], off: Int, len: Int): Unit = writer.write(cbuf, off, len) override def flush(): Unit = writer.flush() override def close(): Unit = writer.close() } override def createEscapingWriterFor(outputStream: OutputStream, s: String): Writer = throw IllegalArgumentException("not supported") } class TestStreamXML extends AnyFunSuite{ val file = new File("stax2test.xml") val fileOutputStream = new FileOutputStream(file) val oprovider: OutputFactoryProviderImpl = new OutputFactoryProviderImpl() val outputFactory: XMLOutputFactory2 = oprovider.createOutputFactory() // your factory implementation goes here as property outputFactory.setProperty(XMLOutputFactory2.P_ATTR_VALUE_ESCAPER, CustomXmlEscapingWriterFactory()) val writer= outputFactory.createXMLStreamWriter(fileOutputStream) writer.writeStartDocument() writer.writeStartElement("elem1") writer.writeAttribute("att1", "This 
 That") writer.writeEndElement() writer.writeEndDocument() } 结果输出如下所示： <?xml version='1.0' encoding='UTF-8'?><elem1 att1="This 
 That"/> [1] https://fasterxml.github.io/stax2-api/javadoc/4.0.0/org/codehaus/stax2/XMLOutputFactory2.html#P_ATTR_VALUE_ESCAPER [2] 使用 jackson-dataformat-xml 转义引号

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