使用DOM4J验证DTD最简单的方法

XMLUtil源文件:

package com.lovo.util;

import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.io.SAXReader;

public class XMLUtil {

	public static Document readXml(String xmlFile) throws DocumentException
	{
		SAXReader reader = new SAXReader();

		reader.setValidation(true);// 是否验证xml文件内的dtd

		Document doc = null;
		doc = reader.read(XMLUtil.class.getResourceAsStream(xmlFile));
		return doc;
		
	}	
}

 

TestXMLUtil.java源文件

package com.lovo.test;
import org.dom4j.Document;

import com.lovo.util.XMLUtil;

public class TestXMLUtil {
	
	public static void test1(){
		Document doc = null;
		try {
			doc = XMLUtil.readXml("/com/lovo/xml/stu1.xml");
			System.out.println(doc.asXML());
		}catch(Exception e){
		   System.out.println(e.getMessage());
		}
	}
	
	public static void main(String[] args) {
		test1();
	}

}

 

 

 

stu1.xml文件:

<?xml version="1.0" encoding="gb2312"?>
<!DOCTYPE lovo SYSTEM "bin/com/lovo/xml/rule.dtd">
<lovo>
   <class1 />
</lovo>

 注意在DOCTYPE中限制xml文件中根节点为:lovo 。

 

rule.dtd文件:

<!ELEMENT lovo (class*) >
<!ELEMENT class EMPTY >

 

现在执行,会因为stu1.xml使用了未定义的class1节点,所以会报错:

Error on line 4 of document  : Element type "class1" must be declared. Nested ex
ception: Element type "class1" must be declared.

验证成功。

 

 

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