如何用Java格式化XML模式验证错误消息？

Question

I want the default error messages printed when validating a xml file against it's schema to be set in a specific format.

1. I do not want the schema error codes to be included in the error message. ie, cvc-complex-type-2-4-b, cvc-mininclusive-valid etc.,

2. I do not want the namespace to be printed in the error messages. eg, One of '{" http://sample.org/xml_schema ":schema_version}' is expected. Note - The XML and XSD use Namespaces.

For example,

Default error message :

"cvc-complex-type.2.4.a: Invalid content was found starting with element 'report_version'. One of '{" http://sample.org/xml_schema ":schema_version}' is expected."

Expected error message :

"Invalid content was found starting with element 'report_version'. One of '{schema_version}' is expected."

Code :

DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
factory.setNamespaceAware(true);

try {
    SchemaFactory sf = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
    Schema schema    = sf.newSchema(ClassLoader.getSystemResource("sample_schema.xsd"));
    factory.setSchema(schema);

    DocumentBuilder builder  = factory.newDocumentBuilder();
    builder.setErrorHandler(new ErrorHandler() {

            @Override
            public void warning(SAXParseException exception) {
                System.out.println(exception.getMessage());
            }

            @Override
            public void fatalError(SAXParseException exception) throws SAXException {
                System.out.println(exception.getMessage());
            }

            @Override
            public void error(SAXParseException exception) {
                System.out.println(exception.getMessage());
            }
        });

    doc   = builder.parse(inputSource);
} catch(Exception e) {

}

Let me know if there is a way to achieve this.

Answer 1

I think it is not possible to override the Expception itself (besides maybe deriving from it and somehow override the throw function, but humm...). Because getMessage() returns a String (possibly null?) you can try to format it by yourself before printing.

There are two ':' so you can cut off everyting in front of the first ':', also you can throw everyting between " ": into the waste bin as far as the message you posted is concerned. Keeping this in mind I am not sure if ALL SaxParseException look like this, you should give it a try.

Idea-Set:

StringBuilder b = exception.getMessage();
b.delete(0, b.indexOf(":"));
b.replace(b.indexOf("{"), b.indexOf("":"), "{"); (you maybe must excape the " with \)
System.out.println(b.toString());

Hope this helps, feel free to ask.