[xmlpull]XmlPull常见错误

编写者	日期	关键词
郑昀@ultrapower	2005-9-28	Xmlpull kxml java

Xmlpull官方站点：http://www.xmlpull.org/

优点：不必等整个文档解析完成，部分求值结果早就可以开始反馈给用户。

What Is It?

XmlPull project is dedicated to be a site for

for general Pull parsing promotion/education (including StAX) and in particular to contain easy-to-reuse samples and code fragments
a resource for discussing new ideas and concepts related to pull parsing
a java namespace (org.xmlpull.*) and project location of a free implementation of the event object API and Factories, based on the StAX XMLStreamReade and old Common API for XML Pull Parsing
as java namespace and project location of StAX and XmlPull based utilities and samples such as:
- providing an XML stream from a DOM tree
- a DOM builder
- SAX adapter
- JUnit tests
as a maintenance resource for the existing XmlPull interface

常见错误一：XmlPullParserException:resource not found

网络中有很多人问到同样一个问题：

为什么我们在调用

XmlPullParserFactory factory = XmlPullParserFactory.newInstance();

时，总是得到这样的错误：

错误提示：

Exception in thread "main" org.xmlpull.v1.XmlPullParserException: caused by: org.xmlpull.v1.XmlPullParserException: resource not found: /META-INF/services/org.xmlpull.v1.XmlPullParserFactory make sure that parser implementing XmlPull API is available

at org.xmlpull.v1.XmlPullParserFactory.newInstance(XmlPullParserFactory.java:294)

虽然从http://www.xmlpull.org/v1/doc/api/org/xmlpull/v1/XmlPullParserFactory.html

看到了他们自己的注解：

XmlPullParserFactory的注释：

If no name of parser factory was passed (or is null) it will try to find name by searching in CLASSPATH for META-INF/services/org.xmlpull.v1.XmlPullParserFactory resource that should contain a comma separated list of class names of factories or parsers to try (in order from left to the right). If none found, it will throw an exception.
NOTE:In J2SE or J2EE environments, you may want to usenewInstance(property, classLoaderCtx) where first argument isSystem.getProperty(XmlPullParserFactory.PROPERTY_NAME) and second isThread.getContextClassLoader().getClass() .

看来它确实需要寻找这么一个资源：

META-INF/services/org.xmlpull.v1.XmlPullParserFactory

。但又没说如何才能找到它。

解决办法

将http://kxml.sourceforge.net/

下载的kxml2.jar加到你的项目中即可。这时候再调用

XmlPullParserFactory factory = XmlPullParserFactory.newInstance(

System.getProperty(XmlPullParserFactory.PROPERTY_NAME),

Thread.currentThread().getContextClassLoader().getClass() );

就通过了。

kxml2.jar就包含了META-INF/services/org.xmlpull.v1.XmlPullParserFactory文件，它的内容其实就是一句话：

org.kxml2.io.KXmlParser,org.kxml2.io.KXmlSerializer

编写者	日期	关键词
郑昀@ultrapower	2005-9-28	Xmlpull kxml java

时间： 2024-04-27 12:41:22

[xmlpull]XmlPull常见错误