本文介绍了如何在VTD Xpath查找上输入名称空间前缀的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

我正在构建一个基于VTD的XML解析引擎,以便处理来自多个输入系统的文件。



我正在尝试从带有命名空间的标签中获取值前缀:

 <?xml version =1.0encoding =UTF-8?> 
< cli:clients xmlns declarations>
< cli:client>
< dat:name>客户名称< / dat:name>
< dat:age> 1< / dat:age>
< / cli:client>


并查询以下X路径:

  // client / age / text()
// client / name / text()

如何设置VTD AutoPilot忽略命名空间前缀?



注意:我无法更改xpath,因为我已经使用JDK的默认xpath引擎实现了这个引擎。



UPDATE :请参阅下面我用来测试的代码。文件类似于顶部的文件:

  @Test 
public void doFile()抛出异常{
byte [] xmlData = FileUtils.loadFile(namespace-test.xml);
VTDGen gen = new VTDGen();
gen.setDoc(xmlData);
gen.parse(false);
VTDNav vtd = gen.getNav();
AutoPilot pilot = new AutoPilot(vtd);
pilot.selectXPath(// clients);
int re = pilot.evalXPath();
System.out.println(re);
if(re> = 0){
System.out.println(vtd.toString(re));
}
}


解决方案

As根据@ vtd-xml-author评论,我得到了最新版本的VTDNav.java文件,并在我自己的项目中编译。



该解决方案首次尝试! / p>

I'm building a VTD based XML Parsing engine in order to process files from several input systems.

I'm currently trying to get values from tags with namespace prefix:

<?xml version="1.0" encoding="UTF-8"?>
 <cli:clients xmlns declarations >
<cli:client>
    <dat:name>CLIENT NAME</dat:name>
    <dat:age>1</dat:age>
</cli:client>

and querying the following Xpaths:

//client/age/text()
//client/name/text()

How can I set VTD AutoPilot to ignore the namespace prefix?

NOTE: I cannot change the xpaths as I already have this engine in production implemented with JDK's default xpath engine.

UPDATE: See below the code I am using to test. File is similar to the one on the top:

@Test
public void doFile() throws Exception {
    byte[] xmlData = FileUtils.loadFile("namespace-test.xml");
    VTDGen gen = new VTDGen();
    gen.setDoc(xmlData);
    gen.parse(false);
    VTDNav vtd = gen.getNav();
    AutoPilot pilot = new AutoPilot(vtd);
    pilot.selectXPath("//clients");
    int re = pilot.evalXPath();
    System.out.println(re);
    if (re >= 0) {
        System.out.println(vtd.toString(re));
    }
}
解决方案

As per @vtd-xml-author comments, I got the newest version of VTDNav.java file and compiled on my own project.

The solution worked on the first try!

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10-23 21:14