XPATH 抛出 java.lang.RuntimeException
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【中文标题】XPATH 抛出 java.lang.RuntimeException【英文标题】：XPATH throwing java.lang.RuntimeException 【发布时间】：2022-01-02 13:06:49 【问题描述】：我希望 CONFIDENTIAL 作为我想要的输出。
我的程序
import org.apache.xmlbeans.XmlException;
import org.apache.xmlbeans.XmlObject;
import java.io.File;
import java.io.IOException;
public class main
public static void main(String[] args)
File file = new File("test.xml");
try
XmlObject xoobj = XmlObject.Factory.parse(file);
var declareNameSpaces = "declare namespace v='urn:schemas-microsoft-com:vml' ";
final String xpathFilter = "data(//v:shape[contains(@id,'PowerPlusWaterMarkObject')]/v:textpath/@string)";
XmlObject[] arr = xoobj.selectPath(declareNameSpaces + xpathFilter);
System.out.println(arr[0].toString());
catch (XmlException | IOException ex)
System.out.println(ex);
test.xml
<xml-fragment
xmlns:wpc="http://schemas.microsoft.com/office/word/2010/wordprocessingCanvas" xmlns:cx="http://schemas.microsoft.com/office/drawing/2014/chartex" xmlns:cx1="http://schemas.microsoft.com/office/drawing/2015/9/8/chartex" xmlns:cx2="http://schemas.microsoft.com/office/drawing/2015/10/21/chartex" xmlns:cx3="http://schemas.microsoft.com/office/drawing/2016/5/9/chartex" xmlns:cx4="http://schemas.microsoft.com/office/drawing/2016/5/10/chartex" xmlns:cx5="http://schemas.microsoft.com/office/drawing/2016/5/11/chartex" xmlns:cx6="http://schemas.microsoft.com/office/drawing/2016/5/12/chartex" xmlns:cx7="http://schemas.microsoft.com/office/drawing/2016/5/13/chartex" xmlns:cx8="http://schemas.microsoft.com/office/drawing/2016/5/14/chartex"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:aink="http://schemas.microsoft.com/office/drawing/2016/ink" xmlns:am3d="http://schemas.microsoft.com/office/drawing/2017/model3d"
xmlns:o="urn:schemas-microsoft-com:office:office"
xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships" xmlns:m="http://schemas.openxmlformats.org/officeDocument/2006/math"
xmlns:v="urn:schemas-microsoft-com:vml"
xmlns:wp14="http://schemas.microsoft.com/office/word/2010/wordprocessingDrawing" xmlns:wp="http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawing"
xmlns:w10="urn:schemas-microsoft-com:office:word"
xmlns:w="http://schemas.openxmlformats.org/wordprocessingml/2006/main" xmlns:w14="http://schemas.microsoft.com/office/word/2010/wordml"
xmlns:w15="http://schemas.microsoft.com/office/word/2012/wordml" xmlns:w16cex="http://schemas.microsoft.com/office/word/2018/wordml/cex" xmlns:w16cid="http://schemas.microsoft.com/office/word/2016/wordml/cid" xmlns:w16="http://schemas.microsoft.com/office/word/2018/wordml" xmlns:w16sdtdh="http://schemas.microsoft.com/office/word/2020/wordml/sdtdatahash" xmlns:w16se="http://schemas.microsoft.com/office/word/2015/wordml/symex" xmlns:wpg="http://schemas.microsoft.com/office/word/2010/wordprocessingGroup" xmlns:wpi="http://schemas.microsoft.com/office/word/2010/wordprocessingInk" xmlns:wne="http://schemas.microsoft.com/office/word/2006/wordml" xmlns:wps="http://schemas.microsoft.com/office/word/2010/wordprocessingShape">
<w:sdtPr>
<w:id w:val="-1126775779"/>
<w:docPartObj>
<w:docPartGallery w:val="Watermarks"/>
<w:docPartUnique/>
</w:docPartObj>
</w:sdtPr>
<w:sdtContent>
<w:p w14:paraId="41319DAD" w14:textId="4534348F" w:rsidR="006868D8" w:rsidRDefault="006868D8">
<w:pPr>
<w:pStyle w:val="Header"/>
</w:pPr>
<w:r>
<w:rPr>
<w:noProof/>
</w:rPr>
<w:pict w14:anchorId="63C3AA3C">
<v:shapetype id="_x0000_t136" coordsize="21600,21600" o:spt="136" adj="10800" path="m@7,l@8,m@5,21600l@6,21600e">
<v:formulas>
<v:f eqn="sum #0 0 10800"/>
<v:f eqn="prod #0 2 1"/>
<v:f eqn="sum 21600 0 @1"/>
<v:f eqn="sum 0 0 @2"/>
<v:f eqn="sum 21600 0 @3"/>
<v:f eqn="if @0 @3 0"/>
<v:f eqn="if @0 21600 @1"/>
<v:f eqn="if @0 0 @2"/>
<v:f eqn="if @0 @4 21600"/>
<v:f eqn="mid @5 @6"/>
<v:f eqn="mid @8 @5"/>
<v:f eqn="mid @7 @8"/>
<v:f eqn="mid @6 @7"/>
<v:f eqn="sum @6 0 @5"/>
</v:formulas>
<v:path textpathok="t" o:connecttype="custom" o:connectlocs="@9,0;@10,10800;@11,21600;@12,10800" o:connectangles="270,180,90,0"/>
<v:textpath on="t" fitshape="t"/>
<v:handles>
<v:h position="#0,bottomRight" xrange="6629,14971"/>
</v:handles>
<o:lock v:ext="edit" text="t" shapetype="t"/>
</v:shapetype>
<v:shape id="PowerPlusWaterMarkObject357476642" o:spid="_x0000_s1025" type="#_x0000_t136" style="position:absolute;margin-left:0;margin-top:0;width:527.85pt;height:131.95pt;rotation:315;z-index:-251657216;mso-position-horizontal:center;mso-position-horizontal-relative:margin;mso-position-vertical:center;mso-position-vertical-relative:margin" o:allowincell="f" fillcolor="silver" stroked="f">
<v:fill opacity=".5"/>
<v:textpath style="font-family:"Calibri";font-size:1pt" string="CONFIDENTIAL"/>
<w10:wrap anchorx="margin" anchory="margin"/>
</v:shape>
</w:pict>
</w:r>
</w:p>
</w:sdtContent>
</xml-fragment>
输出
/Library/Java/JavaVirtualMachines/jdk-11.0.13.jdk/Contents/Home/bin/java -javaagent:/private/var/folders/5_/5blqbh750wsc9pc01bn0lgph0000gn/T/AppTranslocation/3F078016-ECB8-463C-BEBA-5701DF97E1A5/d/IntelliJ IDEA CE.app/Contents/lib/idea_rt.jar=54386:/private/var/folders/5_/5blqbh750wsc9pc01bn0lgph0000gn/T/AppTranslocation/3F078016-ECB8-463C-BEBA-5701DF97E1A5/d/IntelliJ IDEA CE.app/Contents/bin -Dfile.encoding=UTF-8 -classpath /Users/sahibyar/Dailytasks/test-project/target/classes:/Users/sahibyar/.m2/repository/org/apache/xmlbeans/xmlbeans/3.1.0/xmlbeans-3.1.0.jar:/Users/sahibyar/.m2/repository/org/apache/xmlbeans/xmlbeans-xpath/2.4.0/xmlbeans-xpath-2.4.0.jar:/Users/sahibyar/.m2/repository/net/sf/saxon/saxon/8.5.1/saxon-8.5.1.jar:/Users/sahibyar/.m2/repository/net/sf/saxon/saxon-xpath/8.7/saxon-xpath-8.7.jar:/Users/sahibyar/.m2/repository/net/sf/saxon/saxon-dom/8.7/saxon-dom-8.7.jar main
Exception in thread "main" java.lang.RuntimeException: Trying XBeans path engine... Trying XQRL... Trying XDK... Trying delegated path engine... FAILED on declare namespace v='urn:schemas-microsoft-com:vml' data(//v:shape[contains(@id,'PowerPlusWaterMarkObject')]/v:textpath/@string)
at org.apache.xmlbeans.impl.store.Path.getCompiledPath(Path.java:217)
at org.apache.xmlbeans.impl.store.Path.getCompiledPath(Path.java:143)
at org.apache.xmlbeans.impl.store.Cursor._selectPath(Cursor.java:902)
at org.apache.xmlbeans.impl.store.Cursor.selectPath(Cursor.java:2634)
at org.apache.xmlbeans.impl.values.XmlObjectBase.selectPath(XmlObjectBase.java:476)
at org.apache.xmlbeans.impl.values.XmlObjectBase.selectPath(XmlObjectBase.java:460)
at main.main(main.java:14)
Process finished with exit code 1
pom.xml
<?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">
<modelVersion>4.0.0</modelVersion>
<groupId>org.example</groupId>
<artifactId>test-project</artifactId>
<version>1.0-SNAPSHOT</version>
<dependencies>
<dependency>
<groupId>org.apache.xmlbeans</groupId>
<artifactId>xmlbeans</artifactId>
<version>3.1.0</version>
</dependency>
</dependencies>
<properties>
<maven.compiler.source>11</maven.compiler.source>
<maven.compiler.target>11</maven.compiler.target>
</properties>
</project>
【问题讨论】：
【参考方案1】：XPath 解决后，我的问题。
final var xpathFilter = "*//v:shape/v:textpath/@string"
【讨论】：
【参考方案2】：默认情况下，XMLBeans 不支持复杂的 XPath，包括 data() 方法和谓词过滤器等。为了支持这些功能，它依赖于类路径中的 Saxon。
对于 XMLBeans 3.x.x，我们需要手动下载 Saxon 9.0.0.4j 并将其添加到类路径中
对于 XMLBeans 5.x.x（最新），我们需要
Saxon-HE 10.x可以直接添加到我们的pom文件中如下<dependencies> <dependency> <groupId>org.apache.xmlbeans</groupId> <artifactId>xmlbeans</artifactId> <version>5.0.1</version> </dependency> <dependency> <groupId>org.apache.logging.log4j</groupId> <artifactId>log4j-core</artifactId> <version>2.14.1</version> </dependency> <dependency> <groupId>net.sf.saxon</groupId> <artifactId>Saxon-HE</artifactId> <version>10.6</version> </dependency> </dependencies>来源：https://xmlbeans.apache.org/documentation/conInstallGuide.html
其次，我们需要在解析之前手动或在代码中替换根 <xml-fragment> 开始和结束标记，例如 <root>，否则 XMLBeans 会将其解析为 document fragment根节点模式类型而不是 document 类型和带有谓词的 XPath 将不起作用。
最后，假设我们添加了 Saxon 并处理了<xml-fragment/> 标签。要获得CONFIDENTIAL 的值作为输出，我们只需要将结果转换为SimpleValue 并在其上调用getStringValue()。
这是修改后的
import org.apache.xmlbeans.SimpleValue;
import org.apache.xmlbeans.XmlException;
import org.apache.xmlbeans.XmlObject;
import java.io.File;
import java.io.IOException;
public class main
public static void main(String[] args)
File file = new File("test.xml");
try
XmlObject xoobj = XmlObject.Factory.parse(file);
var declareNameSpaces = "declare namespace v='urn:schemas-microsoft-com:vml' ";
final String xpathFilter = "data(//v:shape[contains(@id,'PowerPlusWaterMarkObject')]/v:textpath/@string)";
XmlObject[] arr = xoobj.selectPath(declareNameSpaces + xpathFilter);
//Cast to SimpleValue
SimpleValue result = (SimpleValue) arr[0];
System.out.println(result.getStringValue());
catch (XmlException | IOException ex)
System.out.println(ex);
【讨论】：
【参考方案3】：declare namespace 可以在 XQuery 中完成，但不能在 XPath 中完成，因此要么使用像 BaseX 或 Saxon 10 或 9 这样的 XQuery 处理器，要么研究您选择的 XPath 处理器的 API，对于 XPath，通常有一个 API 方法可以将前缀绑定到命名空间 URI，以便您可以在 XPath 表达式中使用前缀。
【讨论】：
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