dom4j 的 DTD 验证，以及输出乱码问题解决方案

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

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();

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();

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