关于xml解析器
2005-02-04 15:43
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今天看了javaeye上的关于xml的文章,才明白了一些东西。
http://forum.javaeye.com/viewtopic.php?t=75&postdays=0&postorder=asc&start=0
JAXP是sun jdk中提供的xml操作的标准接口,jaxp遵循w3c的dom标准,通过jaxp编写的代码,可以使用不同的xml解析器实现,但jdk1.4默认包括一种解析器Crimson,在rt.jar中可以找到org.apache.crimson包。如果需要使用别的xml解析器,需要专门配置。
以下来自:http://dev.csdn.net/develop/article/61/article/54/54381.shtm
1. 系统属性javax.xml.parsers.DocumentBuilderFactory或javax.xml.parsers.SAXParserFactory
2. 在jdk-dir/lib/jaxp.properties中设定的javax.xml.parsers.DocumentBuilderFactory或javax.xml.parsers.SAXParserFactory属性
3. 运行时jar包中META-INF/services/javax.xml.parsers.DocumentBuilderFactory或javax.xml.parsers.SAXParserFactory文件中设定的值
4. 如果上面的解析器都没有找到,则使用Crimson。如果还没有。。。。。。那只能ClassNotFound了。
经过测试,在jdk1.4中果然是这样的,向robbin说的一样,打开jvm的-verbose参数,可以看到默认情况下载入的类是
[java] [Loaded org.jdom.ContentList]
[java] [Loaded java.lang.CloneNotSupportedException from D:/jdk1.4/jre/lib/rt.jar]
[java] [Loaded java.lang.IndexOutOfBoundsException from D:/jdk1.4/jre/lib/rt.jar]
[java] [Loaded org.jdom.input.JAXPParserFactory]
[java] [Loaded javax.xml.parsers.ParserConfigurationException from D:/jdk1.4/jre/lib/rt.jar]
[java] [Loaded javax.xml.parsers.SAXParserFactory from D:/jdk1.4/jre/lib/rt.jar]
[java] [Loaded javax.xml.parsers.FactoryFinder from D:/jdk1.4/jre/lib/rt.jar]
[java] [Loaded javax.xml.parsers.FactoryFinder$ClassLoaderFinder from D:/jdk1.4/jre/lib/rt.jar]
[java] [Loaded javax.xml.parsers.FactoryFinder$ClassLoaderFinderConcrete from D:/jdk1.4/jre/lib/rt.jar]
[java] [Loaded org.apache.crimson.jaxp.SAXParserFactoryImpl from D:/jdk1.4/jre/lib/rt.jar]
[java] [Loaded javax.xml.parsers.SAXParser from D:/jdk1.4/jre/lib/rt.jar]
[java] [Loaded org.apache.crimson.jaxp.SAXParserImpl from D:/jdk1.4/jre/lib/rt.jar]
[java] [Loaded org.apache.crimson.parser.XMLReaderImpl from D:/jdk1.4/jre/lib/rt.jar]
打开rt.jar是可以找到这些class的。
对jdk5。0也做了同样的测试,发现jdk5.0默认使用的是xerces了,org.apache.xerces放到了com.sun包里了,记得javasearch上有篇文章专门讲过jdk中的sun包是不公开的。
[java] [Loaded javax.xml.parsers.ParserConfigurationException from shared objects file]
[java] [Loaded javax.xml.parsers.SAXParserFactory from shared objects file]
[java] [Loaded javax.xml.parsers.FactoryFinder from shared objects file]
[java] [Loaded javax.xml.parsers.SecuritySupport from shared objects file]
[java] [Loaded javax.xml.parsers.SecuritySupport$2 from shared objects file]
[java] [Loaded javax.xml.parsers.SecuritySupport$1 from shared objects file]
[java] [Loaded javax.xml.parsers.SecuritySupport$5 from shared objects file]
[java] [Loaded javax.xml.parsers.SecuritySupport$4 from shared objects file]
[java] [Loaded com.sun.org.apache.xerces.internal.jaxp.SAXParserFactoryImpl from D:/jdk1.5/jre/lib/rt.jar]
[java] [Loaded com.sun.org.apache.xerces.internal.jaxp.JAXPConstants from D:/jdk1.5/jre/lib/rt.jar]
[java] [Loaded javax.xml.parsers.SAXParser from shared objects file]
[java] [Loaded com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl from D:/jdk1.5/jre/lib/rt.jar]
[java] [Loaded com.sun.org.apache.xerces.internal.util.SecurityManager from D:/jdk1.5/jre/lib/rt.jar]
[java] [Loaded com.sun.org.apache.xerces.internal.xni.parser.XMLComponentManager from D:/jdk1.5/jre/lib/rt.jar]
<script type="text/javascript">
<!--
google_ad_client = "pub-9232855773311077";
google_ad_width = 336;
google_ad_height = 280;
google_ad_format = "336x280_as";
google_ad_channel ="";
//-->
</script><script src="http://pagead2.googlesyndication.com/pagead/show_ads.js" type="text/javascript">
</script><iframe name="google_ads_frame" marginwidth="0" marginheight="0" src="http://pagead2.googlesyndication.com/pagead/ads?client=ca-pub-9232855773311077&dt=1110259223642&format=336x280_as&output=html&u_h=768&u_w=1024&u_ah=738&u_aw=1024&u_cd=32&u_tz=480&u_his=23&u_java=true" frameborder="0" width="336" scrolling="no" height="280" allowtransparency="65535"></iframe>
http://forum.javaeye.com/viewtopic.php?t=75&postdays=0&postorder=asc&start=0
JAXP是sun jdk中提供的xml操作的标准接口,jaxp遵循w3c的dom标准,通过jaxp编写的代码,可以使用不同的xml解析器实现,但jdk1.4默认包括一种解析器Crimson,在rt.jar中可以找到org.apache.crimson包。如果需要使用别的xml解析器,需要专门配置。
以下来自:http://dev.csdn.net/develop/article/61/article/54/54381.shtm
1. 系统属性javax.xml.parsers.DocumentBuilderFactory或javax.xml.parsers.SAXParserFactory
2. 在jdk-dir/lib/jaxp.properties中设定的javax.xml.parsers.DocumentBuilderFactory或javax.xml.parsers.SAXParserFactory属性
3. 运行时jar包中META-INF/services/javax.xml.parsers.DocumentBuilderFactory或javax.xml.parsers.SAXParserFactory文件中设定的值
4. 如果上面的解析器都没有找到,则使用Crimson。如果还没有。。。。。。那只能ClassNotFound了。
经过测试,在jdk1.4中果然是这样的,向robbin说的一样,打开jvm的-verbose参数,可以看到默认情况下载入的类是
[java] [Loaded org.jdom.ContentList]
[java] [Loaded java.lang.CloneNotSupportedException from D:/jdk1.4/jre/lib/rt.jar]
[java] [Loaded java.lang.IndexOutOfBoundsException from D:/jdk1.4/jre/lib/rt.jar]
[java] [Loaded org.jdom.input.JAXPParserFactory]
[java] [Loaded javax.xml.parsers.ParserConfigurationException from D:/jdk1.4/jre/lib/rt.jar]
[java] [Loaded javax.xml.parsers.SAXParserFactory from D:/jdk1.4/jre/lib/rt.jar]
[java] [Loaded javax.xml.parsers.FactoryFinder from D:/jdk1.4/jre/lib/rt.jar]
[java] [Loaded javax.xml.parsers.FactoryFinder$ClassLoaderFinder from D:/jdk1.4/jre/lib/rt.jar]
[java] [Loaded javax.xml.parsers.FactoryFinder$ClassLoaderFinderConcrete from D:/jdk1.4/jre/lib/rt.jar]
[java] [Loaded org.apache.crimson.jaxp.SAXParserFactoryImpl from D:/jdk1.4/jre/lib/rt.jar]
[java] [Loaded javax.xml.parsers.SAXParser from D:/jdk1.4/jre/lib/rt.jar]
[java] [Loaded org.apache.crimson.jaxp.SAXParserImpl from D:/jdk1.4/jre/lib/rt.jar]
[java] [Loaded org.apache.crimson.parser.XMLReaderImpl from D:/jdk1.4/jre/lib/rt.jar]
打开rt.jar是可以找到这些class的。
对jdk5。0也做了同样的测试,发现jdk5.0默认使用的是xerces了,org.apache.xerces放到了com.sun包里了,记得javasearch上有篇文章专门讲过jdk中的sun包是不公开的。
[java] [Loaded javax.xml.parsers.ParserConfigurationException from shared objects file]
[java] [Loaded javax.xml.parsers.SAXParserFactory from shared objects file]
[java] [Loaded javax.xml.parsers.FactoryFinder from shared objects file]
[java] [Loaded javax.xml.parsers.SecuritySupport from shared objects file]
[java] [Loaded javax.xml.parsers.SecuritySupport$2 from shared objects file]
[java] [Loaded javax.xml.parsers.SecuritySupport$1 from shared objects file]
[java] [Loaded javax.xml.parsers.SecuritySupport$5 from shared objects file]
[java] [Loaded javax.xml.parsers.SecuritySupport$4 from shared objects file]
[java] [Loaded com.sun.org.apache.xerces.internal.jaxp.SAXParserFactoryImpl from D:/jdk1.5/jre/lib/rt.jar]
[java] [Loaded com.sun.org.apache.xerces.internal.jaxp.JAXPConstants from D:/jdk1.5/jre/lib/rt.jar]
[java] [Loaded javax.xml.parsers.SAXParser from shared objects file]
[java] [Loaded com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl from D:/jdk1.5/jre/lib/rt.jar]
[java] [Loaded com.sun.org.apache.xerces.internal.util.SecurityManager from D:/jdk1.5/jre/lib/rt.jar]
[java] [Loaded com.sun.org.apache.xerces.internal.xni.parser.XMLComponentManager from D:/jdk1.5/jre/lib/rt.jar]
<script type="text/javascript">
<!--
google_ad_client = "pub-9232855773311077";
google_ad_width = 336;
google_ad_height = 280;
google_ad_format = "336x280_as";
google_ad_channel ="";
//-->
</script><script src="http://pagead2.googlesyndication.com/pagead/show_ads.js" type="text/javascript">
</script><iframe name="google_ads_frame" marginwidth="0" marginheight="0" src="http://pagead2.googlesyndication.com/pagead/ads?client=ca-pub-9232855773311077&dt=1110259223642&format=336x280_as&output=html&u_h=768&u_w=1024&u_ah=738&u_aw=1024&u_cd=32&u_tz=480&u_his=23&u_java=true" frameborder="0" width="336" scrolling="no" height="280" allowtransparency="65535"></iframe>
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