sax解析xml案例一

转自：http://www.cnblogs.com/linjiqin/archive/2011/03/11/1981076.html
——————————————————————————————————————————————————————————————————————————————————————
<?xml version="1.0" encoding="UTF-8"?>
<StudentInfo>  
    <student>  
        <name>赵海波</name>  
        <sex>男</sex>  
        <lesson>  
            <lessonName>Spring整合开发</lessonName>  
            <lessonScore>85</lessonScore>  
        </lesson>  
        <lesson>  
            <lessonName>轻量级J2EE应用开发</lessonName>  
            <lessonScore>95</lessonScore>  
        </lesson>  
        <lesson>  
            <lessonName>Ajax应用开发</lessonName>  
            <lessonScore>80</lessonScore>  
        </lesson>  
    </student>  
    <student>  
        <name>程卫娜</name>  
        <sex>女</sex>  
        <lesson>  
            <lessonName>Spring整合开发</lessonName>  
            <lessonScore>80</lessonScore>  
        </lesson>  
        <lesson>  
            <lessonName>轻量级J2EE应用开发</lessonName>  
            <lessonScore>85</lessonScore>  
        </lesson>  
        <lesson>  
            <lessonName>Ajax应用开发</lessonName>  
            <lessonScore>90</lessonScore>  
        </lesson>  
    </student>  
</StudentInfo>  

fuzhou_weather.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<!-- 福州的天气情况 -->
<xml_api_reply version="1">
    <weather module_id="0" tab_id="0" mobile_row="0" mobile_zipped="1"
        row="0" section="0">
        <forecast_information>
            <city data="Fuzhou, Fujian" />
            <postal_code data="fuzhou" />
            <latitude_e6 data="" />
            <longitude_e6 data="" />
            <forecast_date data="2011-01-08" />
            <current_date_time data="2011-01-08 23:00:00 +0000" />
            <unit_system data="SI" />
        </forecast_information>
        <current_conditions>
            <condition data="多云" />
            <temp_f data="53" />
            <temp_c data="12" />
            <humidity data="湿度： 43%" />
            <icon data="/ig/images/weather/mostly_cloudy.gif" />
            <wind_condition data="风向： 东北、风速：1 米/秒" />
        </current_conditions>
        <forecast_conditions>
            <day_of_week data="周六" />
            <low data="7" />
            <high data="14" />
            <icon data="/ig/images/weather/chance_of_rain.gif" />
            <condition data="可能有雨" />
        </forecast_conditions>
        <forecast_conditions>
            <day_of_week data="周日" />
            <low data="6" />
            <high data="12" />
            <icon data="/ig/images/weather/chance_of_rain.gif" />
            <condition data="可能有雨" />
        </forecast_conditions>
        <forecast_conditions>
            <day_of_week data="周一" />
            <low data="5" />
            <high data="10" />
            <icon data="/ig/images/weather/mostly_sunny.gif" />
            <condition data="晴间多云" />
        </forecast_conditions>
        <forecast_conditions>
            <day_of_week data="周二" />
            <low data="4" />
            <high data="8" />
            <icon data="/ig/images/weather/chance_of_rain.gif" />
            <condition data="可能有雨" />
        </forecast_conditions>
    </weather>
</xml_api_reply>

学生Student类

package com.ljq.entity;

import java.util.Set;

/**
 * 学生信息表
 * 
 * @author jiqinlin
 * 
 */
public class Student {
    /** 姓名 * */
    private String name;
    /** 性别 * */
    private String sex;
    /** 所学课程 * */
    private Set<Lesson> lessons;

    public Student() {
    }

    public Student(String name, String sex, Set<Lesson> lessons) {
        this.name = name;
        this.sex = sex;
        this.lessons = lessons;
    }

    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 Set<Lesson> getLessons() {
        return lessons;
    }

    public void setLessons(Set<Lesson> lessons) {
        this.lessons = lessons;
    }

}

课程Lesson类

package com.ljq.entity;

/**
 * 课程
 * 
 * @author jiqinlin
 * 
 */
public class Lesson {
    /** 课程名称 * */
    private String lessonName;
    /** 课程成绩 * */
    private int lessonScore;

    public Lesson() {
    }

    public Lesson(String lessonName, int lessonScore) {
        this.lessonName = lessonName;
        this.lessonScore = lessonScore;
    }

    public String getLessonName() {
        return lessonName;
    }

    public void setLessonName(String lessonName) {
        this.lessonName = lessonName;
    }

    public int getLessonScore() {
        return lessonScore;
    }

    public void setLessonScore(int lessonScore) {
        this.lessonScore = lessonScore;
    }

}

当前天气信息的类Weather

package com.ljq.entity;

import java.util.List;

/**
 * 当前天气信息的类
 * 
 * @author jiqinlin
 * 
 */
public class Weather {
    /** 城市 * */
    private String city;
    /** 当天日期，格式为yyyy-mm-dd * */
    private String forecase_date;
    /** 当前时间 * */
    private String current_date_time;
    /** 现象描述 * */
    private String current_condition;
    /** 当前干燥程度 * */
    private String current_humidity;
    /** 当前图片地址 * */
    private String current_image_url;
    /** 风向 * */
    private String current_wind;
    /** 此处只能用有序的List集合，因为第一位索引表示当天的天气情况 **/
    private List<Forecast> forecasts;

    public String getCity() {
        return city;
    }

    public void setCity(String city) {
        this.city = city;
    }

    public String getForecase_date() {
        return forecase_date;
    }

    public void setForecase_date(String forecase_date) {
        this.forecase_date = forecase_date;
    }

    public String getCurrent_date_time() {
        return current_date_time;
    }

    public void setCurrent_date_time(String current_date_time) {
        this.current_date_time = current_date_time;
    }

    public String getCurrent_condition() {
        return current_condition;
    }

    public void setCurrent_condition(String current_condition) {
        this.current_condition = current_condition;
    }

    public String getCurrent_humidity() {
        return current_humidity;
    }

    public void setCurrent_humidity(String current_humidity) {
        this.current_humidity = current_humidity;
    }

    public String getCurrent_image_url() {
        return current_image_url;
    }

    public void setCurrent_image_url(String current_image_url) {
        this.current_image_url = current_image_url;
    }

    public String getCurrent_wind() {
        return current_wind;
    }

    public void setCurrent_wind(String current_wind) {
        this.current_wind = current_wind;
    }

    public List<Forecast> getForecasts() {
        return forecasts;
    }

    public void setForecasts(List<Forecast> forecasts) {
        this.forecasts = forecasts;
    }

}

未来天气信息的类Forecast

package com.ljq.entity;

/**
 * 未来天气信息的类
 * 
 * @author jiqinlin
 * 
 */
public class Forecast {
    /** 星期几 * */
    private String day_of_week;
    /** 最低温度 * */
    private String low;
    /** 最高温度 * */
    private String high;
    /** 图片地址 * */
    private String image_url;
    /** 现象描述 * */
    private String condition;

    public String getDay_of_week() {
        return day_of_week;
    }

    public void setDay_of_week(String day_of_week) {
        this.day_of_week = day_of_week;
    }

    public String getLow() {
        return low;
    }

    public void setLow(String low) {
        this.low = low;
    }

    public String getHigh() {
        return high;
    }

    public void setHigh(String high) {
        this.high = high;
    }

    public String getImage_url() {
        return image_url;
    }

    public void setImage_url(String image_url) {
        this.image_url = image_url;
    }

    public String getCondition() {
        return condition;
    }

    public void setCondition(String condition) {
        this.condition = condition;
    }

}

StudentSax解析

package com.ljq.sax;

import java.util.HashSet;
import java.util.Set;

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

import com.ljq.entity.Lesson;
import com.ljq.entity.Student;

public class StudentSax extends DefaultHandler {
    private Lesson lesson;
    private Set<Lesson> lessons;
    private Student student;
    private Set<Student> students;
    private String preTag;

    @Override
    public void startDocument() throws SAXException {
        lessons = new HashSet<Lesson>();
        students = new HashSet<Student>();
    }

    @Override
    public void characters(char[] ch, int start, int length)
            throws SAXException {
        if (student != null) {
            String data = new String(ch, start, length);
            if ("name".equals(preTag)) {
                student.setName(data);
            }
            if ("sex".equals(preTag)) {
                student.setSex(data);
            }
            if ("lessonName".equals(preTag)) {
                lesson.setLessonName(data);
            }
            if ("lessonScore".equals(preTag)) {
                lesson.setLessonScore(Integer.parseInt(data));
            }
        }
    }

    @Override
    public void startElement(String uri, String localName, String name,
            Attributes attr) throws SAXException {
        if ("student".equals(name)) {
            student = new Student();
        }
        if ("lesson".equals(name)) {
            lesson = new Lesson();
        }
        preTag = name;

    }

    @Override
    public void endElement(String uri, String localName, String name)
            throws SAXException {
        if (student != null && "student".equals(name)) {
            student.setLessons(lessons);
            students.add(student);
            student = null;
            lessons = new HashSet<Lesson>();
        }
        if (lesson != null && "lesson".equals(name)) {
            lessons.add(lesson);
            lesson = null;
        }
        preTag = null;
    }

    public Set<Student> getStudents() {
        return students;
    }

    public Set<Lesson> getLessons() {
        return lessons;
    }
}

WeatherSax解析

package com.ljq.sax;

import java.util.ArrayList;
import java.util.List;

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

import com.ljq.entity.Forecast;
import com.ljq.entity.Weather;

public class WeatherSax extends DefaultHandler {
    private Weather weather;
    private Forecast forecast;
    private List<Forecast> forecasts;
    private String preTag;

    @Override
    public void startDocument() throws SAXException {
        weather = new Weather();
        forecasts = new ArrayList<Forecast>();
    }

    @Override
    public void characters(char[] ch, int start, int length)
            throws SAXException {

    }

    @Override
    public void startElement(String uri, String localName, String name,
            Attributes attr) throws SAXException {

        if ("city".equals(name)) {
            weather.setCity(attr.getValue("data")); // 等价于weather.setCity(attr.getValue("data"));
        }
        if ("forecast_date".equals(name)) {
            weather.setForecase_date(attr.getValue("data"));
        }
        if ("current_date_time".equals(name)) {
            weather.setCurrent_date_time(attr.getValue("data"));
        }
        if("current_conditions".equals(name)){
            preTag = name;
        }
        if ("condition".equals(name) && "current_conditions".equals(preTag)) {
            weather.setCurrent_condition(attr.getValue("data"));
        }
        if ("humidity".equals(name)) {
            weather.setCurrent_humidity(attr.getValue("data"));
        }
        if ("icon".equals(name) && "current_conditions".equals(preTag)) {
            weather.setCurrent_image_url(attr.getValue("data"));
        }
        if ("wind_condition".equals(name)) {
            weather.setCurrent_wind(attr.getValue("data"));
        }

        if ("forecast_conditions".equals(name)) {
            preTag = name; // 记录标识，用来区分相同节点的不同父节点
            forecast = new Forecast();
        }
        if ("day_of_week".equals(name)) {
            forecast.setDay_of_week(attr.getValue("data"));
        }
        if ("low".equals(name)) {
            forecast.setLow(attr.getValue("data"));
        }
        if ("high".equals(name)) {
            forecast.setHigh(attr.getValue("data"));
        }

        if ("icon".equals(name) && "forecast_conditions".equals(preTag)) {
            forecast.setImage_url(attr.getValue("data"));
        }
        if ("condition".equals(name) && "forecast_conditions".equals(preTag)) {
            forecast.setCondition(attr.getValue("data"));
        }

    }

    @Override
    public void endElement(String uri, String localName, String name)
            throws SAXException {
        if ("forecast_conditions".equals(name)) {
            forecasts.add(forecast);
            forecast = null;
        }
        if ("weather".equals(name)) {
            weather.setForecasts(forecasts);
        }

    }

    public Weather getWeather() {
        return weather;
    }
}

StudentSaxTest测试类

package com.ljq.test;

import java.io.InputStream;
import java.util.Set;

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

import com.ljq.entity.Lesson;
import com.ljq.entity.Student;
import com.ljq.sax.StudentSax;

public class StudentSaxTest {
    public static void main(String[] args) throws Exception {
        Set<Student> students = new StudentSaxTest().parseXMLFile();
        for(Student stu : students){
            System.out.println("name=" + stu.getName());
            System.out.println("sex=" + stu.getSex());
            Set<Lesson> lessons = stu.getLessons();
            for(Lesson lesson : lessons){
                System.out.println("LessonName = " + lesson.getLessonName());
                System.out.println("LessonScore = " + lesson.getLessonScore());
                System.out.println("---------------");
            }
            System.out.println("==========");
        }
    }

    // 解析文档
    private Set<Student> parseXMLFile() throws Exception {
        SAXParserFactory factory = SAXParserFactory.newInstance();
        SAXParser saxParser = factory.newSAXParser();
        InputStream is = StudentSaxTest.class.getClassLoader()
                .getResourceAsStream("student.xml");
        StudentSax handle = new StudentSax();
        saxParser.parse(is, handle);
        is.close();
        return handle.getStudents();
    }

}

WeatherSaxTest测试类

package com.ljq.test;

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

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

import com.ljq.entity.Forecast;
import com.ljq.entity.Weather;
import com.ljq.sax.WeatherSax;

public class WeatherSaxTest {

    public static void main(String[] args) throws Exception{
        Weather weather = new WeatherSaxTest().readXml();
        System.out.println("city=" + weather.getCity());
        System.out.println("forecase_date=" + weather.getForecase_date());
        System.out.println("current_date_time=" + weather.getCurrent_date_time());
        System.out.println("condition=" + weather.getCurrent_condition());
        System.out.println("humidity=" + weather.getCurrent_humidity());
        System.out.println("icon=" + weather.getCurrent_image_url());
        System.out.println("wind_condition=" + weather.getCurrent_wind());
        System.out.println("===========");
        List<Forecast> forecasts = weather.getForecasts();
        for(Forecast forecast : forecasts){
            System.out.println("day_of_week=" + forecast.getDay_of_week());
            System.out.println("low=" + forecast.getLow());
            System.out.println("high=" + forecast.getHigh());
            System.out.println("icon=" + forecast.getImage_url());
            System.out.println("condition=" + forecast.getCondition());
            System.out.println("---------------");
        }
        
    }
    
    private Weather readXml() throws Exception{
        SAXParserFactory factory = SAXParserFactory.newInstance();
        SAXParser parser = factory.newSAXParser();
        InputStream is = WeatherSaxTest.class.getClassLoader().getResourceAsStream("fuzhou_weather.xml");
        WeatherSax handle = new WeatherSax();
        parser.parse(is, handle);
        is.close();
        return handle.getWeather();
    }
}