在不使用 File 的情况下从带有 JAXB 注释的类生成

Generate a XSD from a JAXB-annotated class without using File(在不使用 File 的情况下从带有 JAXB 注释的类生成 XSD)

问题描述

我正在尝试按照本文中提到的代码从 Java Annotated 类生成 XSD 是否可以从带有 JAXB 注释的类生成 XSD

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;
    }

}

此技术使用文件系统，我的要求是在不使用文件系统的情况下将 XML 作为字符串.

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

SchemaOutputResolver 的实现是否有可能不会将文件写入磁盘并返回或设置一些具有字符串值的实例变量.

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.

推荐答案

您可以在 StringWriter 上编写 StreamResult 并从中获取字符串.

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();
    }

}

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