dom4j解析XML时忽略DTD文件，加速文件解析过程

原来

SAXReader reader = new SAXReader();

修改后

public class IgnoreDTDEntityResolver implements EntityResolver {

        @Override
        public InputSource resolveEntity(String publicId, String systemId)
                throws SAXException, IOException {
            return new InputSource(new ByteArrayInputStream("".getBytes()));
        }

    }

    SAXReader reader;
    public SAXReader getReader(){
        if (reader == null){
            reader = new SAXReader();
            reader.setEntityResolver(new IgnoreDTDEntityResolver());
        }
        return reader;
    }

需要使用 reader 是，调用 getReader , 而不是自己 new 一个，这样既成功的忽略了读取 xml 是的文件头检查