针对XSD模式的Java XML验证
但这会返回一个错误,即: 线程“main”java.lang.IllegalArgumentException中出现异常:无法加载实现由:-实例指定的架构语言的SchemaFactory针对XSD模式的Java XML验证,java,xml,validation,xsd,Java,Xml,Validation,Xsd,但这会返回一个错误,即: 线程“main”java.lang.IllegalArgumentException中出现异常:无法加载实现由:-实例指定的架构语言的SchemaFactory 这是我的代码还是实际的xsd文件的问题?该错误意味着您安装的Java没有任何可以解析XMLSchema文件的类,因此架构或代码没有问题 我很确定最近的JRE默认有合适的类,所以你能给我们提供java-version的输出吗 更新: 您使用了错误的XMLContants字符串。您需要:xmlcants.W3C\
这是我的代码还是实际的xsd文件的问题?该错误意味着您安装的Java没有任何可以解析XMLSchema文件的类,因此架构或代码没有问题 我很确定最近的JRE默认有合适的类,所以你能给我们提供
java-version
的输出吗
更新:
您使用了错误的XMLContants字符串。您需要:
xmlcants.W3C\u XML\u SCHEMA\u NS\u URI
这些文件基于底层系统。我在为Android编程时也遇到了同样的问题。我发现我必须使用Xerces for Android来解决我的问题
以下内容对我在Android上的验证非常有用,如果您的代码与Android相关,可能会有所帮助,如果不相关,则该方法可能会对您的底层系统有所帮助:
import java.io.File;
import javax.xml.XMLConstants;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.Source;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamSource;
import javax.xml.validation.Schema;
import javax.xml.validation.SchemaFactory;
import javax.xml.validation.Validator;
import org.w3c.dom.Document;
/**
* A Utility to help with xml communication validation.
*/
public class XmlUtil {
/**
* Validation method.
* Base code/example from: http://docs.oracle.com/javase/1.5.0/docs/api/javax/xml/validation/package-summary.html
*
* @param xmlFilePath The xml file we are trying to validate.
* @param xmlSchemaFilePath The schema file we are using for the validation. This method assumes the schema file is valid.
* @return True if valid, false if not valid or bad parse.
*/
public static boolean validate(String xmlFilePath, String xmlSchemaFilePath) {
// parse an XML document into a DOM tree
DocumentBuilder parser = null;
Document document;
// Try the validation, we assume that if there are any issues with the validation
// process that the input is invalid.
try {
// validate the DOM tree
parser = DocumentBuilderFactory.newInstance().newDocumentBuilder();
document = parser.parse(new File(xmlFilePath));
// create a SchemaFactory capable of understanding WXS schemas
SchemaFactory factory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
// load a WXS schema, represented by a Schema instance
Source schemaFile = new StreamSource(new File(xmlSchemaFilePath));
Schema schema = factory.newSchema(schemaFile);
// create a Validator instance, which can be used to validate an instance document
Validator validator = schema.newValidator();
validator.validate(new DOMSource(document));
} catch (Exception e) {
// Catches: SAXException, ParserConfigurationException, and IOException.
return false;
}
return true;
}
}
使用上面的jar(最终我会将其制作成一个jar,直接复制到我的源代码中进行快速测试。如果您希望这样做,可以使用Ant()快速制作jar),我能够获得以下用于xml验证的内容:
download xerces-for-android
download silk svn (for windows users) from http://www.sliksvn.com/en/download
install silk svn (I did complete install)
Once the install is complete, you should have svn in your system path.
Test by typing "svn" from the command line.
I went to my desktop then downloaded the xerces project by:
svn checkout http://xerces-for-android.googlecode.com/svn/trunk/ xerces-for-android-read-only
You should then have a new folder on your desktop called xerces-for-android-read-only
一些旁注:
为了创建文件,我制作了一个简单的文件实用程序来向文件写入字符串:
import java.io.File;
import java.io.IOException;
import mf.javax.xml.transform.Source;
import mf.javax.xml.transform.stream.StreamSource;
import mf.javax.xml.validation.Schema;
import mf.javax.xml.validation.SchemaFactory;
import mf.javax.xml.validation.Validator;
import mf.org.apache.xerces.jaxp.validation.XMLSchemaFactory;
import org.xml.sax.SAXException;
/**
* A Utility to help with xml communication validation.
*/public class XmlUtil {
/**
* Validation method.
*
* @param xmlFilePath The xml file we are trying to validate.
* @param xmlSchemaFilePath The schema file we are using for the validation. This method assumes the schema file is valid.
* @return True if valid, false if not valid or bad parse or exception/error during parse.
*/
public static boolean validate(String xmlFilePath, String xmlSchemaFilePath) {
// Try the validation, we assume that if there are any issues with the validation
// process that the input is invalid.
try {
SchemaFactory factory = new XMLSchemaFactory();
Source schemaFile = new StreamSource(new File(xmlSchemaFilePath));
Source xmlSource = new StreamSource(new File(xmlFilePath));
Schema schema = factory.newSchema(schemaFile);
Validator validator = schema.newValidator();
validator.validate(xmlSource);
} catch (SAXException e) {
return false;
} catch (IOException e) {
return false;
} catch (Exception e) {
// Catches everything beyond: SAXException, and IOException.
e.printStackTrace();
return false;
} catch (Error e) {
// Needed this for debugging when I was having issues with my 1st set of code.
e.printStackTrace();
return false;
}
return true;
}
}
我还需要写一个我可以访问的区域,所以我利用了:
public static void createFileFromString(String fileText, String fileName) {
try {
File file = new File(fileName);
BufferedWriter output = new BufferedWriter(new FileWriter(file));
output.write(fileText);
output.close();
} catch ( IOException e ) {
e.printStackTrace();
}
}
有点老套,它很管用。我确信有一种更简洁的方法可以做到这一点,但是我想我会分享我的成功,因为我没有找到任何好的例子。java版本“1.6.0_17”java(TM)SE运行时环境(构建1.6.0_17-b04)java热点(TM)客户端VM(构建14.3-b01,混合模式,共享)我有同样的问题,但我的系统java版本“1.6.0_20”OpenJDK运行时环境(IcedTea6 1.9.13)(6b20-1.9.13-0ubuntu1~10.10.1)OpenJDK 64位服务器虚拟机(构建19.0-b09,混合模式),我使用XMLConstants.W3C_XML_SCHEMA_NS_URI常量,但我仍然得到上面的错误(java.lang.illegargumentException)。请建议
public static void createFileFromString(String fileText, String fileName) {
try {
File file = new File(fileName);
BufferedWriter output = new BufferedWriter(new FileWriter(file));
output.write(fileText);
output.close();
} catch ( IOException e ) {
e.printStackTrace();
}
}
String path = this.getActivity().getPackageManager().getPackageInfo(getPackageName(), 0).applicationInfo.dataDir;