针对XSD架构的Java XML验证

2 回答

• 2

  该错误意味着您安装的Java没有任何可以解析XMLSchema文件的类，因此它不是架构或代码的问题 .

  我很确定最近的JRE默认有相应的类，所以你能得到 java -version 的输出吗？

  ---

  更新：

  您正在使用错误的XMLContants字符串 . 你想： XMLConstants.W3C_XML_SCHEMA_NS_URI

  回复于 2024-04-26T08:14:50+08:00
• 16

  这些文件基于底层系统 . 我在编写Android项目时遇到了同样的问题 . 我发现我必须使用Xerces-for-Android来解决我的问题 .

  以下是我在Android上验证的问题，如果你的代码与Android有关，也许它会有所帮助，如果它没有，那么这个方法可能会帮助你使用你的底层系统：

  • 创建验证实用程序 .

  • 在Android操作系统上同时获取xml和xsd文件并对其使用验证实用程序 .

  • 使用Xerces-For-Android进行验证 .

  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 .

  我找到了对xerces for android的引用，所以我修改了我的沙箱测试（ the following doesn't work with android, the example after this does ）：

  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，以下是一些婴儿床注意事项：

  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（http://ant.apache.org/manual/using.html）快速制作jar），我能够让我的xml验证工作：

  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;
      }
  }
  

  Some Side Notes:

  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 .

  回复于 2024-04-26T08:14:50+08:00