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("<?xml version='1.0' encoding='UTF-8'?>".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