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背景：我使用StAX将XML文档拆分为多个部分，例如分别保存每个段落。为此，我使用XMLEventReader阅读文档并遍历事件。当我遇到要存储的元素时，我将其复制到StringWriter并保留字符串的内容。复制元素上删除处理指令目标和数据之间的空间
但是，当我遇到处理指令时，我遇到了一个问题。
package com.util.xml;
import static org.assertj.core.api.Assertions.assertThat;
import java.io.StringWriter;
import javax.xml.stream.XMLEventReader;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamConstants;
import javax.xml.stream.events.XMLEvent;
import org.apache.commons.io.IOUtils;
import org.junit.Test;
import javanet.staxutils.XMLStreamUtils;
import javanet.staxutils.io.StreamEventWriter;
public class XmlUtilTest {
@Test
public void xml_with_processing_instruction_is_retained() throws Exception {
final XMLInputFactory inputFactory = XMLInputFactory.newInstance();
final String xml = "<p><?processing-instruction user=\"stuart\"?>Title</p>";
final XMLEventReader eventReader = inputFactory.createXMLEventReader(IOUtils.toInputStream(xml));
final StringWriter stringWriter = new StringWriter();
while (eventReader.hasNext()) {
final XMLEvent event = eventReader.peek();
if (event.getEventType() == XMLStreamConstants.START_ELEMENT) {
XMLStreamUtils.copy(eventReader, new StreamEventWriter(stringWriter));
break;
} else {
eventReader.nextEvent();
}
}
final String output = stringWriter.toString();
assertThat(output).isEqualTo(xml);
}
}
我期望的输出是相同的作为输入（这是一个简单的复制），但是在处理指令目标（processing-instruction）和数据之间的空间（：我已用下面的代码复制的问题user=\"stuart\"）正在被删除：
org.junit.ComparisonFailure: expected:<...ocessing-instruction[ ]user="stuart"?>Title...> but was:<...ocessing-instruction[]user="stuart"?>Title...>
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at com.util.xml.xmlcontent.ingestion.XmlUtilTest.xml_with_processing_instruction_is_retained(XmlUtilTest.java:38)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:678)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)
我错过了什么吗？
你能告诉我们一个你的XML的例子和它们被分割的标准吗？ –
这与这个问题无关，我对分裂过程感到满意，问题在于处理指令，所以我不想被误解。 – Stu