sax 解析 xml

HandlerXML.java--处理xml

package cn.com.songjy.xml;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

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

public class HandlerXML extends DefaultHandler {

	List<ForecastCondition> forecast_conditions = new ArrayList<ForecastCondition>();
	ForecastCondition forecast_condition = new ForecastCondition();
	Map<String, Object> forecast_information = new HashMap<String, Object>();
	Map<String, Object> current_condition = new HashMap<String, Object>();
	boolean current_condition_flag = false;
	boolean forecast_information_flag = false;
	boolean forecast_conditions_flag = false;

	public List<ForecastCondition> getForecastConditions() {
		return forecast_conditions;
	}


	public Map<String, Object> getForecastInformation(){
		return forecast_information;
	}

	public Map<String, Object> getCurrentConditions(){
		return current_condition;
	}

	@Override
	public void startElement(String uri, String localName, String qName,
			Attributes attributes) throws SAXException {

		if("forecast_information".equals(qName))
			forecast_information_flag = true;

		if(forecast_information_flag && "city".equals(qName))
			forecast_information.put("city", attributes.getValue("data"));
		if(forecast_information_flag && "forecast_date".equals(qName))
			forecast_information.put("forecast_date", attributes.getValue("data"));
		if(forecast_information_flag && "current_date_time".equals(qName))
			forecast_information.put("current_date_time", attributes.getValue("data"));

		if("current_conditions".equals(qName))
			current_condition_flag = true;

		if(current_condition_flag && "condition".equals(qName))
			current_condition.put("condition", attributes.getValue("data"));
		if(current_condition_flag && "temp_f".equals(qName))
			current_condition.put("temp_f", attributes.getValue("data"));
		if(current_condition_flag && "temp_c".equals(qName))
			current_condition.put("temp_c", attributes.getValue("data"));
		if(current_condition_flag && "humidity".equals(qName))
			current_condition.put("humidity", attributes.getValue("data"));
		if(current_condition_flag && "icon".equals(qName))
			current_condition.put("icon", attributes.getValue("data"));
		if(current_condition_flag && "wind_condition".equals(qName))
			current_condition.put("wind_condition", attributes.getValue("data"));

		if("forecast_conditions".equals(qName))
			forecast_conditions_flag = true;

		if (forecast_conditions_flag && "day_of_week".equals(qName)) {
			String week = attributes.getValue("data");
			forecast_condition = new ForecastCondition();//不可省略，否则将永远是最后一条记录
			forecast_condition.setWeek(week);
		}

		if (forecast_conditions_flag && "low".equals(qName)) {
			int low = Integer.parseInt(attributes.getValue("data"));
			forecast_condition.setLow(low);

		}
		if (forecast_conditions_flag && "high".equals(qName)) {
			int hight = Integer.parseInt(attributes.getValue("data"));
			forecast_condition.setHight(hight);

		}

		if (forecast_conditions_flag && "icon".equals(qName)) {
			String icon = attributes.getValue("data");
			forecast_condition.setIcon(icon);

		}

		if (forecast_conditions_flag && "condition".equals(qName)) {
			String condition = attributes.getValue("data");
			forecast_condition.setCondition(condition);

		}

	}

	@Override
	public void endElement(String uri, String localName, String qName)
			throws SAXException {

		if("current_conditions".equals(qName))
			current_condition_flag = false;
		if("forecast_information".equals(qName))
			forecast_information_flag = false;
		if("forecast_conditions".equals(qName))
			forecast_conditions_flag = false;

		if ("forecast_conditions".equals(qName)) {
			forecast_conditions.add(forecast_condition);
		}
	}

}

ParsersXML.java--显示处理结果

package cn.com.songjy.xml;

import java.io.IOException;
import java.io.StringReader;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

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

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;

public class ParsersXML {

	public static void main(String[] args) {
		Map<String, Object> map = readXml();
		List<ForecastCondition> forecastConditions = (List<ForecastCondition>) map.get("forecastConditions");
		Map<String, Object> forecast_information = (Map<String, Object>) map.get("forecast_information");
		Map<String, Object> current_condition = (Map<String, Object>) map.get("current_condition");

		System.out.println("**********预测数据**********");
		for (ForecastCondition weather : forecastConditions) {
			System.out.println(weather.toString());
		}

		System.out.println("**********预报信息**********");

		for (String key : forecast_information.keySet()) {
			System.out.println(forecast_information.get(key).toString());
		}

		System.out.println("**********当天数据**********");
		for (String key : current_condition.keySet()) {
			System.out.println(current_condition.get(key).toString());
		}

	}

	public static Map<String, Object> readXml() {
		Map<String, Object> map = new HashMap<String, Object>();
		SAXParserFactory factory = SAXParserFactory.newInstance();
		try {
			SAXParser parser = factory.newSAXParser();
			InputSource inputSource = new InputSource(new StringReader(getWeatherAsString()));
			HandlerXML handlerXML = new HandlerXML();
			try {
				parser.parse(inputSource, handlerXML);
				map.put("forecastConditions", handlerXML.getForecastConditions());
				map.put("forecast_information", handlerXML.getForecastInformation());
				map.put("current_condition", handlerXML.getCurrentConditions());
				return map;
			} catch (IOException e) {
				e.printStackTrace();
			}
		} catch (ParserConfigurationException e) {
			e.printStackTrace();
		} catch (SAXException e) {
			e.printStackTrace();
		}
		return null;
	}

	//调用公开API获取XML数据
	public static String getWeatherAsString() {
		String strUrl = "http://www.google.com/ig/api?hl=zh-cn&weather=Ganzhou,Jiangxi";
		HttpGet getRequest = new HttpGet(strUrl);
		DefaultHttpClient client = new DefaultHttpClient();
		try {
			HttpResponse response = client.execute(getRequest);
			if (response.getStatusLine().getStatusCode() == 200) {
				HttpEntity entity = response.getEntity();
				return EntityUtils.toString(entity);
			}
		} catch (ClientProtocolException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		return null;
	}
}

执行效果如下：

**********预测数据**********
预测数据 [week=周四, hight=33, low=24, icon=/ig/images/weather/thunderstorm.gif, condition=雷阵雨]
预测数据 [week=周五, hight=32, low=24, icon=/ig/images/weather/chance_of_storm.gif, condition=可能有暴风雨]
预测数据 [week=周六, hight=31, low=24, icon=/ig/images/weather/chance_of_storm.gif, condition=可能有暴风雨]
预测数据 [week=周日, hight=31, low=24, icon=/ig/images/weather/chance_of_storm.gif, condition=可能有暴风雨]
**********预报信息**********
2012-06-07 17:00:00 +0000
2012-06-07
Ganzhou, Jiangxi
**********当天数据**********
/ig/images/weather/mostly_cloudy.gif
湿度： 60%
88
风向： 西南、风速：3 米/秒
多云
31


ForecastCondition.java--对象

package cn.com.songjy.xml;

public class ForecastCondition {

	private String week;
	private int low;
	private int hight;
	private String icon;
	private String condition;

	@Override
	public String toString() {
		return "预测数据 [week=" + week + ", hight=" + hight
				+ ", low=" + low + ", icon=" + icon + ", condition=" + condition + "]";
	}

	public String getWeek() {
		return week;
	}

	public void setWeek(String week) {
		this.week = week;
	}

	public int getLow() {
		return low;
	}

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

	public int getHight() {
		return hight;
	}

	public void setHight(int hight) {
		this.hight = hight;
	}

	public String getIcon() {
		return icon;
	}

	public void setIcon(String icon) {
		this.icon = icon;
	}

	public String getCondition() {
		return condition;
	}

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

}

所需jar包可从附件下载

引自：[url]http://www.2cto.com/kf/201204/127466.html[/url]