我创建了一个XML
并且我有一个XSD
文件,我必须用这个模式验证xml,我可以得到任何这样的例子。我必须将xsd文件放在我的项目中,以便我可以使用该模式进行验证。
答案 0 :(得分:5)
根据API级别8支持documentation javax.xml.validation 。
(我会测试并尽快报告)
好的,问题不是那么简单:
SchemaFactory factory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
在第8级和第9级API上失败,并且出现了here所述的IllegalArgumentException
除了找到完全相同的失败报告之外,谷歌没有帮助解决这个问题。 API在这里,但不是实现(默认)。答案 1 :(得分:3)
这是由Google here
发布的已知问题解决方案是使用移植到Android的Apache Xerces。 有一个项目here
你必须做一个svn chekout并将proyect导出到jar文件中,以用作你的android proyect中的库。
实例SchemaFactory的代码稍有改动。 我给你举个例子:
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;
SchemaFactory factory = new XMLSchemaFactory();
Schema esquema = factory.newSchema(".../file.xsd");
答案 2 :(得分:1)
因此,您可能需要包含比在非阉割的Java平台上更多的罐子。 此外,由于黑/白名单问题,可能会增加标准API的限制(这是Google AppEngine的一个大问题,而且由于Android早于它,它也有类似的挑战)。
除此之外,我会尝试将javax.xml.validation与捆绑的XML解析器Xerces一起使用。有很多关于如何做到这一点的方法文件。
答案 3 :(得分:0)
在阅读了很多帖子并尝试了很多不同的东西之后,我终于通过Xerces-for-Android让我的工作正常,并试图为其他人很好地记录这个过程...希望它有所帮助:)
以下对我有用:
Android确实支持我们可以使用的一些软件包,我根据以下内容创建了我的xml验证工具:http://docs.oracle.com/javase/1.5.0/docs/api/javax/xml/validation/package-summary.html
我最初的沙盒测试使用java非常顺利,然后我尝试将其移植到Dalvik并发现我的代码无效。有些事情与Dalvik不相同,所以我做了一些修改。
我找到了一个对xerces for android的引用,所以我修改了我的沙箱测试(以下不适用于android,这个例子之后的例子):
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;
}
}
上面的代码必须修改一些才能与xerces for android(http://gc.codehum.com/p/xerces-for-android/)一起使用。您需要SVN才能获得该项目,以下是一些小册子:
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
使用上面的jar(最后我会把它变成一个jar,只需将它直接复制到我的源代码中进行快速测试。如果你想这样做,你可以用Ant快速制作jar({{3} }),我能够得到以下代码来进行我的xml验证:
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;
}
}
一些备注:
为了创建文件,我创建了一个简单的文件实用程序来将字符串写入文件:
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();
}
}
我还需要写一个我可以访问的区域,所以我使用了:
String path = this.getActivity().getPackageManager().getPackageInfo(getPackageName(), 0).applicationInfo.dataDir;
有点hackish,它的确有效。我确信有一种更简洁的方式可以做到这一点,但我想我会分享我的成功,因为我找不到任何好的例子。