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"dom4j, dtd, EntityResolver, 未找到外部实体, 慢"

Using dom4j to read xml file, it always resolve external or internal DTDs, then it makes reading slow or raise exception. I've found a way to resolve this.

Reading codes:

        SAXReader saxReader = new SAXReader(false);

EntityResolver codes:

class NullEntityResolver implements EntityResolver {

    static ByteArrayInputStream byteIs = new ByteArrayInputStream(emptyDtd.getBytes());

    public InputSource resolveEntity(String publicId, String systemId) throws SAXException, IOException {

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