针对 XSD Schema 的 Java XML 验证

问题描述

private void validateXML(DOMSource source) throws Exception {
    URL schemaFile = new URL("http://www.csc.liv.ac.uk/~valli/modules.xsd");
    SchemaFactory schemaFactory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_INSTANCE_NS_URI);
    Schema schema = schemaFactory.newSchema(schemaFile);

    Validator validator = schema.newValidator();
    DOMResult result = new DOMResult();
    try {
        validator.validate(source, result); 
        System.out.println("is valid");
    } catch (SAXException e) {
        System.out.println("not valid because " + e.getLocalizedMessage());
    }
}

但这会返回一个错误:线程main"java.lang.IllegalArgumentException 中的异常:没有实现由 http:///www.w3.org/2001/XMLSchema - 可以加载实例

But this returns an error saying: Exception in thread "main" java.lang.IllegalArgumentException: No SchemaFactory that implements the schema language specified by: http://www.w3.org/2001/XMLSchema -instance could be loaded

这是我的代码问题还是实际 xsd 文件的问题?

Is this a problem with my code or with the actual xsd file?

推荐答案

这个错误意味着你安装的Java没有任何可以解析XMLSchema文件的类，所以不是schema或者你的代码有问题.

That error means that your installed Java doesn't have any classes that can parse XMLSchema files, so it's not a problem with the schema or your code.

p>

我很确定最近的 JRE 默认有合适的类，所以你能给我们提供 java -version 的输出吗?

更新:

您使用了错误的 XMLContants 字符串.你想要:XMLConstants.W3C_XML_SCHEMA_NS_URI

You're using the wrong XMLContants string. You want: XMLConstants.W3C_XML_SCHEMA_NS_URI

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