xml文件如何实现正确性验证类
xml文件如何实现正确性验证类？相信很多没有经验的人对此束手无策，为此本文总结了问题出现的原因和解决方法，通过这篇文章希望你能解决这个问题。
很多时候我们的应用程序或者web程序需要用到xml文件进行配置,而最终的程序是需要给客户使用的,所以xml或者也需要客户来写,而客户来写的话的,就不能保证xml文件绝对的正确,于是我写了这个类,主要功能就是验证xml书写文件是否符合定义的xsd规范.
package common.xml.validator;import java.io.File;import java.io.FileInputStream;import java.io.IOException;import java.io.InputStream;import java.io.Reader;import java.io.StringReader;import java.net.URL;import javax.xml.XMLConstants;import javax.xml.transform.Source;import javax.xml.transform.stream.StreamSource;import javax.xml.validation.Schema;import javax.xml.validation.SchemaFactory;import javax.xml.validation.Validator;import org.xml.sax.SAXException;/** *//*** @author suyuan**/public class XmlSchemaValidator { private boolean isValid = true; private String xmlErr = ""; public boolean isValid() { return isValid; } public String getXmlErr() { return xmlErr; } public XmlSchemaValidator() { } public boolean ValidXmlDoc(String xml,URL schema) { StringReader reader = new StringReader(xml); return ValidXmlDoc(reader,schema); } public boolean ValidXmlDoc(Reader xml,URL schema) { try { InputStream schemaStream = schema.openStream(); Source xmlSource = new StreamSource(xml); Source schemaSource = new StreamSource(schemaStream); return ValidXmlDoc(xmlSource,schemaSource); } catch (IOException e) { isValid = false; xmlErr = e.getMessage(); return false; } } public boolean ValidXmlDoc(String xml,File schema) { StringReader reader = new StringReader(xml); return ValidXmlDoc(reader,schema); } public boolean ValidXmlDoc(Reader xml,File schema) { try { FileInputStream schemaStream = new FileInputStream(schema); Source xmlSource = new StreamSource(xml); Source schemaSource = new StreamSource(schemaStream); return ValidXmlDoc(xmlSource,schemaSource); } catch (IOException e) { isValid = false; xmlErr = e.getMessage(); return false; } } public boolean ValidXmlDoc(Source xml,Source schemaSource) { try { SchemaFactory schemafactory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI); if(xml==null||xml.equals("")) { return false; } Schema schema = schemafactory.newSchema(schemaSource); Validator valid = schema.newValidator(); valid.validate(xml); return true; } catch (SAXException e) { isValid = false; xmlErr = e.getMessage(); return false; } catch (IOException e) { isValid = false; xmlErr = e.getMessage(); return false; } catch (Exception e) { isValid = false; xmlErr = e.getMessage(); return false; } }}
类的使用方法如下:
package common.xml.validator;import java.io.*;import java.net.URL;public class testXmlValidator { /** *//** * @param args */ public static void main(String[] args) { InputStream XmlStream = testXmlValidator.class.getResourceAsStream("test.xml"); Reader XmlReader = new InputStreamReader(XmlStream); URL schema =testXmlValidator.class.getResource("valid.xsd"); XmlSchemaValidator xmlvalid = new XmlSchemaValidator(); System.out.println(xmlvalid.ValidXmlDoc(XmlReader, schema)); System.out.print(xmlvalid.getXmlErr()); }}
xsd文件定义如下:
<xs:schema id="XSDSchemaTest" xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified" attributeFormDefault="unqualified"><xs:simpleType name="FamilyMemberType"> <xs:restriction base="xs:string"> <xs:enumeration value="384" /> <xs:enumeration value="385" /> <xs:enumeration value="386" /> <xs:enumeration value="" /> </xs:restriction></xs:simpleType> <xs:element name="Answer"> <xs:complexType> <xs:sequence> <xs:element name="ShortDesc" type="FamilyMemberType" /> <xs:element name="AnswerValue" type="xs:int" /> </xs:sequence> </xs:complexType> </xs:element></xs:schema>
被验证的xml 实例如下:
<?xml version="1.0" encoding="utf-8" ?><Answer> <ShortDesc>385</ShortDesc> <AnswerValue>1</AnswerValue></Answer>
这个是java版本的类,C# 的类文件如下(是一个老美写的,我的类是根据他的类翻译过来的):
using System;using System.Xml;using System.Xml.Schema;using System.IO;namespace ProtocolManager.WebApp{ /**//// <summary> /// This class validates an xml string or xml document against an xml schema. /// It has public methods that return a boolean value depending on the validation /// of the xml. /// </summary> public class XmlSchemaValidator { private bool isValidXml = true; private string validationError = ""; /**//// <summary> /// Empty Constructor. /// </summary> public XmlSchemaValidator() { } /**//// <summary> /// Public get/set access to the validation error. /// </summary> public String ValidationError { get { return "<ValidationError>" + this.validationError + "</ValidationError>"; } set { this.validationError = value; } } /**//// <summary> /// Public get access to the isValidXml attribute. /// </summary> public bool IsValidXml { get { return this.isValidXml; } } /**//// <summary> /// This method is invoked when the XML does not match /// the XML Schema. /// </summary> /// <param name="sender"></param> /// <param name="args"></param> private void ValidationCallBack(object sender, ValidationEventArgs args) { // The xml does not match the schema. isValidXml = false; this.ValidationError = args.Message; } /**//// <summary> /// This method validates an xml string against an xml schema. /// </summary> /// <param name="xml">XML string</param> /// <param name="schemaNamespace">XML Schema Namespace</param> /// <param name="schemaUri">XML Schema Uri</param> /// <returns>bool</returns> public bool ValidXmlDoc(string xml, string schemaNamespace, string schemaUri) { try { // Is the xml string valid? if(xml == null || xml.Length < 1) { return false; } StringReader srXml = new StringReader(xml); return ValidXmlDoc(srXml, schemaNamespace, schemaUri); } catch(Exception ex) { this.ValidationError = ex.Message; return false; } } /**//// <summary> /// This method validates an xml document against an xml schema. /// </summary> /// <param name="xml">XmlDocument</param> /// <param name="schemaNamespace">XML Schema Namespace</param> /// <param name="schemaUri">XML Schema Uri</param> /// <returns>bool</returns> public bool ValidXmlDoc(XmlDocument xml, string schemaNamespace, string schemaUri) { try { // Is the xml object valid? if(xml == null) { return false; } // Create a new string writer. StringWriter sw = new StringWriter(); // Set the string writer as the text writer to write to. XmlTextWriter xw = new XmlTextWriter(sw); // Write to the text writer. xml.WriteTo(xw); // Get string strXml = sw.ToString(); StringReader srXml = new StringReader(strXml); return ValidXmlDoc(srXml, schemaNamespace, schemaUri); } catch(Exception ex) { this.ValidationError = ex.Message; return false; } } /**//// <summary> /// This method validates an xml string against an xml schema. /// </summary> /// <param name="xml">StringReader containing xml</param> /// <param name="schemaNamespace">XML Schema Namespace</param> /// <param name="schemaUri">XML Schema Uri</param> /// <returns>bool</returns> public bool ValidXmlDoc(StringReader xml, string schemaNamespace, string schemaUri) { // Continue? if(xml == null || schemaNamespace == null || schemaUri == null) { return false; } isValidXml = true; XmlValidatingReader vr; XmlTextReader tr; XmlSchemaCollection schemaCol = new XmlSchemaCollection(); schemaCol.Add(schemaNamespace, schemaUri); try { // Read the xml. tr = new XmlTextReader(xml); // Create the validator. vr = new XmlValidatingReader(tr); // Set the validation tyep. vr.ValidationType = ValidationType.Auto; // Add the schema. if(schemaCol != null) { vr.Schemas.Add(schemaCol); } // Set the validation event handler. vr.ValidationEventHandler += new ValidationEventHandler(ValidationCallBack); // Read the xml schema. while(vr.Read()) { } vr.Close(); return isValidXml; } catch(Exception ex) { this.ValidationError = ex.Message; return false; } finally { // Clean up vr = null; tr = null; } } }
看完上述内容，你们掌握xml文件如何实现正确性验证类的方法了吗？如果还想学到更多技能或想了解更多相关内容，欢迎关注亿速云行业资讯频道，感谢各位的阅读！
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