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正常的 dom4j 读取 xml 的方式如下：

SAXReader reader = new SAXReader();reader.setEntityResolver(resolver);Document doc = reader.read(resource.getInputStream());Element root = doc.getRootElement();

 1. 如何忽略 DTD 的验证

SAXReader reader = new SAXReader();reader.setEntityResolver(new EntityResolver () { public InputSource resolveEntity(String publicId, String systemId) throws SAXException, IOException { return new InputSource(new ByteArrayInputStream("<?xml version='1.0' encoding='utf-8'?>".getBytes())); }});xmldoc = reader.read(new File(fileName));xmlroot = xmldoc.getRootElement();

2. 使用本地的DTD文件

EntityResolver resolver = new EntityResolver() { public InputSource resolveEntity(String publicId, String systemId) throws SAXException, IOException { if (publicId.equals("-//Humpic Organization//DTD Walrus Statement Configuration 1.5//EN") || systemId.equals("http://www.humpic.com/walrus/dtds/walrus-statement-config-1.5.dtd") || systemId.endsWith("walrus-statement-config-1.5.dtd")) { InputStream in = this.getClass().getResourceAsStream("/META-INF/walrus-statement-config-1.5.dtd"); return new InputSource(in); } else if (publicId.equals("-//Humpic Organization//DTD Walrus Configuration 1.5//EN") || systemId.equals("http://www.humpic.com/walrus/dtds/walrus-config-1.5.dtd") || systemId.endsWith("walrus-config-1.5.dtd")) { InputStream in = this.getClass().getResourceAsStream("/META-INF/walrus-config-1.5.dtd"); return new InputSource(in); } return null; }};SAXReader reader = new SAXReader();reader.setEntityResolver(resolver);Document doc = reader.read(resource.getInputStream());Element root = doc.getRootElement();

3. 保存文件

 OutputFormat format = OutputFormat.createPrettyPrint();format.setEncoding(xmldoc.getXMLEncoding());XMLWriter writer = new XMLWriter(new FileOutputStream(fileName), format);writer.write(xmldoc);writer.close();

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