sax解析xml

sax方式解析xml的优点：
          只要有jdk的存在，严格意义上来说是jre，它就可以运行，不依赖任何第三方的jar包。在移动设备上尤为广泛使用。比如Android就使用它来解析xml。当然Android更为推荐的是采用xmlpull来解析xml。这种方式也同样适合javase。我在后期会为大家准备使用xmlpull解析xml的demo。敬请关注。
          xml文件：

<? xml version="1.0" encoding="UTF-8" ?>
< root >
     < student  id ="1"  group ="1" >
         < name > 张三 </ name >
         < sex > 男 </ sex >
         < age > 18 </ age >
         < email > [email protected] </ email >
         < birthday > 1987-06-08 </ birthday >
         < memo > 好学生 </ memo >
     </ student >
     < student  id ="2"  group ="2" >
         < name > 李四 </ name >
         < sex > 女 </ sex >
         < age > 18 </ age >
         < email > [email protected] </ email >
         < birthday > 1987-06-08 </ birthday >
         < memo > 好学生 </ memo >
     </ student >
     < student  id ="3"  group ="3" >
         < name > 小王 </ name >
         < sex > 男 </ sex >
         < age > 18 </ age >
         < email > [email protected] </ email >
         < birthday > 1987-06-08 </ birthday >
         < memo > 好学生 </ memo >
     </ student >
     < student  id ="4"  group ="4" >
         < name > 小张 </ name >
         < sex > 男 </ sex >
         < age > 18 </ age >
         < email > [email protected] </ email >
         < birthday > 1987-06-08 </ birthday >
         < memo > 好学生 </ memo >
     </ student >
     < student  id ="5"  group ="5" >
         < name > 小明 </ name >
         < sex > 男 </ sex >
         < age > 18 </ age >
         < email > [email protected] </ email >
         < birthday > 1987-06-08 </ birthday >
         < memo > 好学生 </ memo >
     </ student >
</ root >

    xml对应的Javabean：

package  com.parsexml.entity;

public   class  Student {
    
     private   int  id;
     private   int  group;
     private  String name;
     private  String sex;
     private   int  age;
     private  String email;
     private  String memo;
     private  String birthday;
     public   int  getId() {
         return  id;
    }
     public   void  setId( int  id) {
         this .id  =  id;
    }
     public   int  getGroup() {
         return  group;
    }
     public   void  setGroup( int  group) {
         this .group  =  group;
    }
     public  String getName() {
         return  name;
    }
     public   void  setName(String name) {
         this .name  =  name;
    }
     public  String getSex() {
         return  sex;
    }
     public   void  setSex(String sex) {
         this .sex  =  sex;
    }
     public   int  getAge() {
         return  age;
    }
     public   void  setAge( int  age) {
         this .age  =  age;
    }
     public  String getEmail() {
         return  email;
    }
     public   void  setEmail(String email) {
         this .email  =  email;
    }
     public  String getMemo() {
         return  memo;
    }
     public   void  setMemo(String memo) {
         this .memo  =  memo;
    }
     public  String getBirthday() {
         return  birthday;
    }
     public   void  setBirthday(String birthday) {
         this .birthday  =  birthday;
    }
    
}

   开始解析：

package  com.parsexml;

import  java.io.IOException;
import  java.io.InputStream;
import  java.util.ArrayList;
import  java.util.List;

import  javax.xml.parsers.ParserConfigurationException;
import  javax.xml.parsers.SAXParser;
import  javax.xml.parsers.SAXParserFactory;

import  org.xml.sax.Attributes;
import  org.xml.sax.SAXException;
import  org.xml.sax.helpers.DefaultHandler;

import  com.parsexml.entity.Student;

/**
 * 功能描述:采用sax方式解析XML<br>
 * 
 *  @author  sxyx2008
 *
  */
public   class  SaxParseXml  extends  DefaultHandler{

     // 存放遍历集合
     private  List < Student >  list;
     // 构建Student对象
     private  Student student;
     // 用来存放每次遍历后的元素名称(节点名称)
     private  String tagName;
    
    
     public  List < Student >  getList() {
         return  list;
    }


     public   void  setList(List < Student >  list) {
         this .list  =  list;
    }


     public  Student getStudent() {
         return  student;
    }


     public   void  setStudent(Student student) {
         this .student  =  student;
    }


     public  String getTagName() {
         return  tagName;
    }


     public   void  setTagName(String tagName) {
         this .tagName  =  tagName;
    }


     // 只调用一次  初始化list集合  
    @Override
     public   void  startDocument()  throws  SAXException {
        list = new  ArrayList < Student > ();
    }
    
    
     // 调用多次    开始解析
    @Override
     public   void  startElement(String uri, String localName, String qName,
            Attributes attributes)  throws  SAXException {
         if (qName.equals( " student " )){
            student = new  Student();
             // 获取student节点上的id属性值
            student.setId(Integer.parseInt(attributes.getValue( 0 )));
             // 获取student节点上的group属性值
            student.setGroup(Integer.parseInt(attributes.getValue( 1 )));
        }
         this .tagName = qName;
    }
    
    
     // 调用多次  
    @Override
     public   void  endElement(String uri, String localName, String qName)
             throws  SAXException {
         if (qName.equals( " student " )){
             this .list.add( this .student);
        }
         this .tagName = null ;
    }
    
    
     // 只调用一次
    @Override
     public   void  endDocument()  throws  SAXException {
    }
    
     // 调用多次
    @Override
     public   void  characters( char [] ch,  int  start,  int  length)
             throws  SAXException {
         if ( this .tagName != null ){
            String date = new  String(ch,start,length);
             if ( this .tagName.equals( " name " )){
                 this .student.setName(date);
            }
             else   if ( this .tagName.equals( " sex " )){
                 this .student.setSex(date);
            }
             else   if ( this .tagName.equals( " age " )){
                 this .student.setAge(Integer.parseInt(date));
            }
             else   if ( this .tagName.equals( " email " )){
                 this .student.setEmail(date);
            }
             else   if ( this .tagName.equals( " birthday " )){
                 this .student.setBirthday(date);
            }
             else   if ( this .tagName.equals( " memo " )){
                 this .student.setMemo(date);
            }
        }
    }
    
    
    
     public   static   void  main(String[] args) {
        SAXParser parser  =   null ;
         try  {
             // 构建SAXParser
            parser  =  SAXParserFactory.newInstance().newSAXParser();
             // 实例化  DefaultHandler对象
            SaxParseXml parseXml = new  SaxParseXml();
             // 加载资源文件 转化为一个输入流
            InputStream stream = SaxParseXml. class .getClassLoader().getResourceAsStream( " Student.xml " );
             // 调用parse()方法
            parser.parse(stream, parseXml);
             // 遍历结果
            List < Student >  list = parseXml.getList();
             for (Student student:list){
                System.out.println( " id: " + student.getId() + " \tgroup: " + student.getGroup() + " \tname: " + student.getName() + " \tsex: " + student.getSex() + " \tage: " + student.getAge() + " \temail: " + student.getEmail() + " \tbirthday: " + student.getBirthday() + " \tmemo: " + student.getMemo());
            }
        }  catch  (ParserConfigurationException e) {
            e.printStackTrace();
        }  catch  (SAXException e) {
            e.printStackTrace();
        }  catch  (IOException e) {
            e.printStackTrace();
        }
    }
    
}

   效果图：