BAEL-5671 code for the validate an XML file against an XSD file article

2022-07-10 22:54:49 +02:00
parent 4c1e18b15e
commit 145b782d4b
7 changed files with 189 additions and 0 deletions
@@ -0,0 +1,35 @@
+package com.baeldung.xml.validation;
+
+import org.xml.sax.ErrorHandler;
+import org.xml.sax.SAXParseException;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class XmlErrorHandler implements ErrorHandler {
+
+    private List<SAXParseException> exceptions;
+
+    public XmlErrorHandler() {
+        this.exceptions = new ArrayList<>();
+    }
+
+    public List<SAXParseException> getExceptions() {
+        return exceptions;
+    }
+
+    @Override
+    public void warning(SAXParseException exception) {
+        exceptions.add(exception);
+    }
+
+    @Override
+    public void error(SAXParseException exception) {
+        exceptions.add(exception);
+    }
+
+    @Override
+    public void fatalError(SAXParseException exception) {
+        exceptions.add(exception);
+    }
+}
@@ -0,0 +1,62 @@
+package com.baeldung.xml.validation;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.xml.sax.SAXException;
+import org.xml.sax.SAXParseException;
+
+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 java.io.File;
+import java.io.IOException;
+import java.util.List;
+
+public class XmlValidator {
+
+    private static final Logger LOGGER = LoggerFactory.getLogger(XmlValidator.class);
+
+    private String xsdPath;
+    private String xmlPath;
+
+    public XmlValidator(String xsdPath, String xmlPath) {
+        this.xsdPath = xsdPath;
+        this.xmlPath = xmlPath;
+    }
+
+    public boolean isValid() throws IOException, SAXException {
+        Validator validator = initValidator(xsdPath);
+        try {
+            validator.validate(new StreamSource(getFile(xmlPath)));
+            return true;
+        } catch (SAXException e) {
+            return false;
+        }
+    }
+
+    public List<SAXParseException> listParsingExceptions() throws IOException, SAXException {
+        XmlErrorHandler xsdErrorHandler = new XmlErrorHandler();
+        Validator validator = initValidator(xsdPath);
+        validator.setErrorHandler(xsdErrorHandler);
+        try {
+            validator.validate(new StreamSource(getFile(xmlPath)));
+        } catch (SAXParseException e) {}
+        xsdErrorHandler.getExceptions().forEach(e -> LOGGER.info(e.getMessage()));
+        return xsdErrorHandler.getExceptions();
+    }
+
+    private Validator initValidator(String xsdPath) throws SAXException {
+        SchemaFactory factory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
+        Source schemaFile = new StreamSource(getFile(xsdPath));
+        Schema schema = factory.newSchema(schemaFile);
+        return schema.newValidator();
+    }
+
+    private File getFile(String location) {
+        return new File(getClass().getClassLoader().getResource(location).getFile());
+    }
+
+}