Java XML Validation API can be used to validate XML against XSD in java program. javax.xml.validation.Validator class is used in this program to validate xml against xsd in java.

Java XML验证API可用于针对Java程序中的XSD验证XML。 此程序中使用javax.xml.validation.Validator类针对Java中的xsd验证xml。

针对XSD验证XML (Validate XML against XSD)

Here are the sample XSD and XML files used.

这是使用的示例XSD和XML文件。

Employee.xsd

Employee.xsd

Notice that above XSD contains two root element and namespace also, I have created two sample .

注意，上面的XSD还包含两个根元素和名称空间，我已经创建了两个示例 。

EmployeeRequest.xml

EmployeeRequest.xml

    
      
     
      5
     
    

EmployeeResponse.xml

EmployeeResponse.xml

    
      
     
      1
       
     
      Developer
       
     
      Pankaj Kumar
     
    

Here is another XML file that doesn’t confirms to the Employee.xsd.

这是另一个未向Employee.xsd确认的XML文件。

employee.xml

employee.xml

    
    	
     
      Pankaj
     	
     
      29
     	
     
      Java Developer
     	
     
      Male
     
    

Here is the program that is used to validate all three XML files against the XSD. The validateXMLSchema method takes XSD and XML file as argument and return true if validation is successful or else returns false.

这是用于针对XSD验证所有三个XML文件的程序。 validateXMLSchema方法将XSD和XML文件作为参数，如果验证成功，则返回true ，否则返回false 。

XMLValidation.java

XMLValidation.java

package com.journaldev.xml;import java.io.File;import java.io.IOException;import javax.xml.XMLConstants;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;public class XMLValidation {    public static void main(String[] args) {              System.out.println("EmployeeRequest.xml validates against Employee.xsd? "+validateXMLSchema("Employee.xsd", "EmployeeRequest.xml"));      System.out.println("EmployeeResponse.xml validates against Employee.xsd? "+validateXMLSchema("Employee.xsd", "EmployeeResponse.xml"));      System.out.println("employee.xml validates against Employee.xsd? "+validateXMLSchema("Employee.xsd", "employee.xml"));            }        public static boolean validateXMLSchema(String xsdPath, String xmlPath){                try {            SchemaFactory factory =                     SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);            Schema schema = factory.newSchema(new File(xsdPath));            Validator validator = schema.newValidator();            validator.validate(new StreamSource(new File(xmlPath)));        } catch (IOException | SAXException e) {            System.out.println("Exception: "+e.getMessage());            return false;        }        return true;    }}

Output of the above program is:

上面程序的输出是：

EmployeeRequest.xml validates against Employee.xsd? trueEmployeeResponse.xml validates against Employee.xsd? trueException: cvc-elt.1: Cannot find the declaration of element 'Employee'.employee.xml validates against Employee.xsd? false

The benefit of using Java XML validation API is that we don’t need to parse the file and there is no third party APIs used.

使用Java XML验证API的好处是我们不需要解析文件，并且不使用任何第三方API。

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