Android中的XML架构validation

我已经创建了一个XML,我想用模式validation,即XSD文件,但是如果我没有错误,没有android提供的直接类………并且有一个名为jaxp1.3的外部jar jaxp1.3这不允许我编译代码是因为桌面和android的字节码是不同的? 哪个类架构工厂和validation器执行validation的东西……还有其他选项可用。 任何帮助将不胜感激…..拼命寻找ans ……….

这是谷歌在这里发布的一个已知问题

解决方案是使用移植到Android的Apache Xerces。 这里有一个项目

你必须做一个svn chekout并将proyect导出到一个jar文件,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"); 

@iOSDev,我不得不使用Xerces-for-Android进行validation。 以下是我使用我的程序所做的工作的摘要:

  1. 创建validation实用程序。
  2. 将android和OS上的xml和xsd都放到文件中,并使用validation实用程序。
  3. 使用Xerces-For-Android进行validation。

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xmlvalidation实用程序: http : //docs.oracle.com/javase/1.5.0/docs/api/javax/xml/validation/package-summary.html

我最初的沙箱测试非常流畅,然后我尝试将其移植到Dalvik并发现我的代码不起作用。 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盒测试( 以下不适用于android,这之后的例子 ):

 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(最终我将它变成一个jar,只需将它直接复制到我的源代码中进行快速测试。如果你想做同样的事情,你可以使用Ant快速制作jar( http://ant.apache .org / manual / using.html )),我能够获得以下工作来进行我的xmlvalidation:

 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; } } 

一些附注:

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,它的工作原理。 我确信有更简洁的方法可以做到这一点,但我想我会分享我的成功,因为我没有找到任何好的例子。