SAX解析XML-说明及示例代码

SAX解析XML

SAX是一个用于处理XML事件驱动的“推”模型，虽然它不是W3C标准，但它却是一个得到了广泛认可的API。SAX解析器不像DOM那样建立一个完整的文档树，而是在读取文档时激活一系列事件，这些事件被推给事件处理器，然后由事件处理器提供对文档内容的访问。

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SAL解析xml文件步骤
1. 创建SAX解析器工厂对象
2. 通过解析器工厂对象获取解析器对象
3. 通过解析器对象获取reader读取器
4. 设置reader事件处理器
5. 利用reader读取xml文件

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下面是用SAX解析studeng.xml文件事例代码：

package SAX;import java.io.StreamCorruptedException;import java.util.ArrayList;import javax.xml.parsers.SAXParser;import javax.xml.parsers.SAXParserFactory;import org.xml.sax.Attributes;import org.xml.sax.SAXException;import org.xml.sax.XMLReader;import org.xml.sax.helpers.DefaultHandler;public class SAXDemo02 {    /**     * 使用Sax方法解析students.xml文件，保存到集合中     * @param args     */    public static void main(String[] args) throws Exception{        //1.创建工厂   SAX分析工厂        SAXParserFactory factory = SAXParserFactory.newInstance();        //2.创建解释器        SAXParser parser = factory.newSAXParser();        //3.从解释器获取读取器        XMLReader reader = parser.getXMLReader();        StudentContentHandler2 studentContentHandler2 = new StudentContentHandler2();        //4.设置内容处理器        reader.setContentHandler(studentContentHandler2);        //5.解析        reader.parse("xml\\student.xml");        for(Student s:studentContentHandler2.getList()){            System.out.println(s.getId()+"--"+s.getName()+"--"+s.getAge()+"--"+s.getSex());        }    }}class StudentContentHandler2 extends DefaultHandler{    ArrayList<Student> list =new ArrayList<Student>();    String currentTagName;    Student student  = null;    public ArrayList<Student> getList() {        return list;    }    public void setList(ArrayList<Student> list) {        this.list = list;    }    public String getCurrentTagName() {        return currentTagName;    }    public void setCurrentTagName(String currentTagName) {        this.currentTagName = currentTagName;    }    public Student getStudent() {        return student;    }    public void setStudent(Student student) {        this.student = student;    }    //内容处理器开始标签    @Override    public void startElement(String uri, String localName, String qName,            Attributes attributes) throws SAXException {        currentTagName = qName;        if(qName.equals("student")){            student = new Student();        }    }    //内容处理器 结束标签    @Override    public void endElement(String uri, String localName, String qName)            throws SAXException {        currentTagName = "";        if(qName.equals("student")){            list.add(student);        }    }    //内容处理 处理内容标签    @Override    public void characters(char[] ch, int start, int length)            throws SAXException {        if(currentTagName.equals("name")){            student.setName(new String(ch,start,length));        }else if(currentTagName.equals("age")){            student.setAge(Integer.parseInt(new String(ch,start,length)));        }else if(currentTagName.equals("sex")){            student.setSex(new String(ch,start,length));        }else if(currentTagName.equals("id")){            student.setId(Integer.parseInt(new String(ch,start,length)));        }    }}class Student{    private int id;    private String name;    private int age;    private String sex;    public Student() {        super();        // TODO Auto-generated constructor stub    }    public Student(int id, String name, int age, String sex) {        super();        this.id = id;        this.name = name;        this.age = age;        this.sex = sex;    }    public int getId() {        return id;    }    public void setId(int id) {        this.id = id;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public int getAge() {        return age;    }    public void setAge(int age) {        this.age = age;    }    public String getSex() {        return sex;    }    public void setSex(String sex) {        this.sex = sex;    }}

studeng.xml文件内容：

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<?xml version="1.0" encoding="UTF-8"?><students>    <student>        <id>1</id>        <name>zhangsan</name>        <age>20</age>        <sex>male</sex>    </student>    <student>        <id>2</id>        <name>lisi</name>        <age>21</age>        <sex>female</sex>    </student></students>