Generate a XSD from a JAXB-annotated class without using File

问题

I am trying to generate XSD from Java Annotated classes by following code mentioned in this post Is it possible to generate a XSD from a JAXB-annotated class

JAXBContext jaxbContext = JAXBContext.newInstance(Customer.class);
SchemaOutputResolver sor = new MySchemaOutputResolver();
jaxbContext.generateSchema(sor);

public class MySchemaOutputResolver extends SchemaOutputResolver {

    public Result createOutput(String namespaceURI, String suggestedFileName) throws IOException {
        File file = new File(suggestedFileName);
        StreamResult result = new StreamResult(file);
        result.setSystemId(file.toURI().toURL().toString());
        return result;
    }

}

This technique is using File system, My requirement is to get the XML as String without using file system.

Is there any possibility the Implementation of SchemaOutputResolver may not write file to disk and return or set some instance variable with the String value.

回答1:

You can write the StreamResult on a StringWriter and get the string from that.

JAXBContext jaxbContext = JAXBContext.newInstance(Customer.class);
MySchemaOutputResolver sor = new MySchemaOutputResolver();
jaxbContext.generateSchema(sor);
String schema = sor.getSchema();

public class MySchemaOutputResolver extends SchemaOutputResolver {
    private StringWriter stringWriter = new StringWriter();    

    public Result createOutput(String namespaceURI, String suggestedFileName) throws IOException  {
        StreamResult result = new StreamResult(stringWriter);
        result.setSystemId(suggestedFileName);
        return result;
    }

    public String getSchema() {
        return stringWriter.toString();
    }

}

来源：https://stackoverflow.com/questions/24038802/generate-a-xsd-from-a-jaxb-annotated-class-without-using-file