java解析XML详解

<?xml-stylesheet type= "text/xsl" href= "student.xsl" ?>

<?xml version= "1.0" encoding= "gb2312" ?>

<xs:schema xmlns:xs= "http://HdhCmsTestw3.org/2001/xmlschema" >

     <xs:element name= "丛书" >

         <xs:complextype>

             <xs:sequence>

                 <xs:element name= "书" >

                     <xs:element name= "名"   minoccurs= "1" ></xs:element>

                     <xs:element name= "人" ></xs:element>

                     <xs:element name= "价" >

                         <xs:attribute name= "unit" >

                             <xs:enumeration value= "rmb" />

                             <xs:enumeration value= "美元" />

                             <xs:enumeration value= "日元" />

                         </xs:attribute>

                     </xs:element>

                 </xs:element>

         </xs:sequence>

         </xs:complextype>

     </xs:element>

</xs:schema>

/**

  * 使用jdk自带的"dom解析"xml文件（读）

  */

public class text04 {

     public static void main(string[] args) throws exception {

         //创建文档解析器工厂对象

         documentbuilderfactory factory= documentbuilderfactory.newinstance();

         //创建文档解析器对象

         documentbuilder builder=factory.newdocumentbuilder();

         //开始解析xml文件

         string path=thread.currentthread().getcontextclassloader().getresource( "db-config.xml" ).touri().getpath();

         document document =builder.parse( new file(path)); //dom树，在内存中生成了一颗dom树

         //获取根元素

         node rootnode=document.getfirstchild();

         //获取根元素的名字

         system.out.println(rootnode.getnodename());

         //通过根元素获取其他元素

         node drivernode=document.getelementsbytagname( "driver" ).item( 0 );

         string driver =drivernode.gettextcontent();

         system.out.println(driver);

     }

}

/**

  * 使用dom4j开源项目解析xml文件（读）

  *

  * 读xml文件

  *

  * dom4j

  *

  * 基于dom方式

  */

public class text01 {

     public static void main(string[] args) throws exception {

         //创建解析器对象

         saxreader reader= new saxreader(); //虽然使用了saxreader，但是还是基于dom的解析方式

         //获取文档对象，还是dom树

         string path=thread.currentthread().getcontextclassloader().getresource( "db-config.xml" ).touri().getpath();

         document document= reader.read( new file(path));

         //获取根元素

         element rootelement=document.getrootelement();

         //system.out.println(element.getname());

         //获取driver元素

         element driverelement =rootelement.element( "driver" );

         //在获取文本

         string driver=driverelement.gettext();

         //system.out.println(driver);

         //直接获取元素的文本内容

         driver=rootelement.elementtext( "driver" );

         system.out.println(driver);

         system.out.println(rootelement.elementtext( "url" ));

         system.out.println(rootelement.elementtext( "user" ));

         system.out.println(rootelement.elementtext( "password" ));

     }

}

import org.dom4j.document;

import org.dom4j.documenthelper;

import org.dom4j.element;

import org.dom4j.io.outputformat;

import org.dom4j.io.xmlwriter;

import java.io.file;

import java.io.filewriter;

/**

  * 使用dom4j开源项目解析xml文件(写)

  */

public class text02 {

     public static void main(string[] args) throws exception {

         //创建文档对象

         document document= documenthelper.createdocument();

         //添加根元素

         element studentinfoelt=document.addelement( "学生信息" );

         //给学生信息节点添加子节点学生节点

         element studentelt=studentinfoelt.addelement( "学生" );

         //给学生节点添加id属性

         studentelt.addattribute( "id" , "110" );

         //给学生节点添加名字字节点

         element nameelt=studentelt.addelement( "名字" );

         //设置名字节点文本

         nameelt.settext( "张三" );

         //给学生节点添加性别字节点

         element sexelt=studentelt.addelement( "性别" );

         //设置名字节点文本

         sexelt.settext( "男" );

         //开始写

         outputformat format= outputformat.createprettyprint();

         format.setencoding( "utf-8" );

         string path= "students.xml" ;

         xmlwriter xmlwriter= new xmlwriter( new filewriter( new file(path)),format);

         xmlwriter.write(document);

         xmlwriter.close();

     }

}