约束不起作用了

xml_2Writer 类

package xml_2;

import java.io.FileOutputStream;

import java.io.OutputStreamWriter;

import java.io.Writer;

import org.dom4j.Document;

import org.dom4j.DocumentException;

import org.dom4j.Element;

import org.dom4j.io.SAXReader;

public class xml_2Writer {

public void WriterXml(){

String file="D:/JAVA/z-z-xml/src/xml_2/xml_2.xml";

SAXReader reader=new SAXReader();

try {

Document document=reader.read(file);

Element root=document.getRootElement();

Element course=root.addElement("course");

course.addElement("course-name").setText("大学物理");

course.addElement("class-hour").setText("111");

course.addElement("exam-form").setText("考试");

course.addAttribute("no", "4");

/**

* 把内存中信息写回文件

*/

//核心方法  导入输入输出流包

Writer writer=new OutputStreamWriter(new FileOutputStream(file),"UTF-8");

document.write(writer);

writer.close();

} catch (Exception e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

/**

* @param args

*/

public static void main(String[] args) {

// TODO Auto-generated method stub

               xml_2Writer reader=new xml_2Writer();

               reader.WriterXml();

}

}

xml_2.xml    类

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

<!-- 教学计划课程信息 --><!-- <!DOCTYPE xml_2 SYSTEM "xml_2.dtd"> -->

<teaching-plan xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:noNamespaceSchemaLocation="xml_2.xsd">

<course no="1">

<course-name>大学英语</course-name>

<class-hour>110</class-hour>

<exam-form>考试</exam-form>

</course>

<course no="2">

<course-name>高等数学</course-name>

<class-hour>70</class-hour>

<exam-form>考试</exam-form>

</course>

<course no="3">

<course-name>计算机应用基础</course-name>

<class-hour>108</class-hour>

<exam-form>上机考试</exam-form>

</course>

<course>

<course-name>大学物理</course-name>

<class-hour>111</class-hour>

<exam-form>考试</exam-form>

</course>

<course no="4">

<course-name>大学物理</course-name>

<class-hour>111</class-hour>

<exam-form>考试</exam-form>

</course>

</teaching-plan>

xml_xsd.xsd     类

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

<schema xmlns="http://www.w3.org/2001/XMLSchema">

  <element name="teaching-plan">

     <complexType>

        <sequence>

             <element name="course" minOccurs="1" maxOccurs="100">

                   <complexType>

                       <sequence>

                           <element name="course-name" type="string"></element>

                           <element name="class-hour">

                              <simpleType>

                                   <restriction base="integer">

                                        <minInclusive value="20"></minInclusive>

                                        <maxInclusive value="110"></maxInclusive>

                                   </restriction>

                              </simpleType>

                           </element>

                           <element name="exam-form" type="string"></element>

                       </sequence>

                       <attribute name="no" type="string" use="required"></attribute>

                   </complexType>

             </element>   

        </sequence>

     </complexType>

  </element>

</schema>