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百度天气预报API的使用(java版本)

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 开发微信公众平台时,想要实现查询天气功能,找啊找,就找到了百度地图api; 使用方法进行简单总结:

此文章内容,转自我之前写的一篇文章: http://blog.csdn.net/ashenyy/article/details/25072857

要使用百度天气预报api,首先要有密钥ak,申请地址http://developer.baidu.com/map/lbs-cloud.htm

然后向http://api.map.baidu.com/telematics/v3/weather?location=%E9%83%91%E5%B7%9E&output=xml&ak=A72e372de05e63c8740b2622d0ed8ab1 请求,然后会返还给你一个xml文档格式的天气预报如下:

<?xml version="1.0" encoding="utf-8" ?>
<CityWeatherResponse>
<status>success</status>
 <date>2014-04-29</date>
<results>
<currentCity>郑州</currentCity>
<weather_data>
      <date>周二(今天, 实时:20℃)</date>
  <dayPictureUrl>http://api.map.baidu.com/images/weather/day/qing.png<;/dayPictureUrl>
  <nightPictureUrl>http://api.map.baidu.com/images/weather/night/qing.png<;/nightPictureUrl>
  <weather>晴</weather>
  <wind>微风</wind>
  <temperature>13℃</temperature>
      <date>周三</date>
  <dayPictureUrl>http://api.map.baidu.com/images/weather/day/qing.png<;/dayPictureUrl>
  <nightPictureUrl>http://api.map.baidu.com/images/weather/night/qing.png<;/nightPictureUrl>
  <weather>晴</weather>
  <wind>微风</wind>
  <temperature>28 ~ 15℃</temperature>
      <date>周四</date>
  <dayPictureUrl>http://api.map.baidu.com/images/weather/day/duoyun.png<;/dayPictureUrl>
  <nightPictureUrl>http://api.map.baidu.com/images/weather/night/yin.png<;/nightPictureUrl>
  <weather>多云转阴</weather>
  <wind>微风</wind>
  <temperature>30 ~ 15℃</temperature>
      <date>周五</date>
  <dayPictureUrl>http://api.map.baidu.com/images/weather/day/yin.png<;/dayPictureUrl>
  <nightPictureUrl>http://api.map.baidu.com/images/weather/night/duoyun.png<;/nightPictureUrl>
  <weather>阴转多云</weather>
  <wind>微风</wind>
  <temperature>25 ~ 15℃</temperature>
    </weather_data>
</results>
</CityWeatherResponse>

接下 来只需要对此xml文档解析取出数据即可 具体代码如下:


    package com.ashen.testapi;
    import java.io.BufferedReader;
    import java.io.InputStream;
    import java.io.InputStreamReader;
    import java.io.UnsupportedEncodingException;
    import java.net.HttpURLConnection;
    import java.net.URL;
    import java.net.URLEncoder;
    import java.util.Iterator;
    import java.util.List;
    import org.dom4j.Document;
    import org.dom4j.DocumentException;
    import org.dom4j.DocumentHelper;
    import org.dom4j.Element;
    public class BaiduWeather {
    //获取天气信息
  public static String GetWeater(String city) {
    BaiduWeather wu=new BaiduWeather();
    String buffstr=null;
    try {
        String xml= wu.GetXmlCode(URLEncoder.encode(city, "utf-8"));  //设置输入城市的编码,以满足百度天气api需要
        buffstr=wu.readStringXml(xml,city);//调用xml解析函数
    } catch (Exception e) {
    e.printStackTrace();
    }
    return  buffstr;
    }
    public String GetXmlCode(String city) throws UnsupportedEncodingException{
    String requestUrl = "http://api.map.baidu.com/telematics/v3/weather?location="+city+"&output=xml&ak=A72e372de05e63c8740b2622d0ed8ab1";  
    StringBuffer buffer = null;  
    try {  
    // 建立连接  
    URL url = new URL(requestUrl);
    HttpURLConnection httpUrlConn = (HttpURLConnection) url.openConnection();  
    httpUrlConn.setDoInput(true);  
    httpUrlConn.setRequestMethod("GET");  
    // 获取输入流  
    InputStream inputStream = httpUrlConn.getInputStream();  
    InputStreamReader inputStreamReader = new InputStreamReader(inputStream, "utf-8");  
    BufferedReader bufferedReader = new BufferedReader(inputStreamReader);  
    // 读取返回结果  
    buffer = new StringBuffer();  
    String str = null;  
    while ((str = bufferedReader.readLine()) != null) {  
      buffer.append(str);  
    }  
  
   // 释放资源  
   bufferedReader.close();  
    inputStreamReader.close();  
    inputStream.close();  
    httpUrlConn.disconnect();  
    } catch (Exception e) {  
    e.printStackTrace();  
    }  
    return buffer.toString();  //返回获取的xml字符串
}
public String readStringXml(String xml,String ifcity) {
  StringBuffer buff=new StringBuffer();  //用来拼接天气信息的
  Document doc = null;
  List listdate=null;  //用来存放日期
  List listday=null;  //用来存放白天图片路径信息
  List listweather=null;
  List listwind=null;
  List listtem=null;
  try {
    // 读取并解析XML文档
    //下面的是通过解析xml字符串的
    doc = DocumentHelper.parseText(xml); // 将字符串转为XML  
    Element rootElt = doc.getRootElement(); // 获取根节点    
    Iterator iter = rootElt.elementIterator("results"); // 获取根节点下的子节点results
    String status=rootElt.elementText("status"); //获取状态,如果等于success,表示有数据
    if(!status.equals("success"))
      return "暂无数据";  //如果不存在数据,直接返回
    String date= rootElt.elementText("date");  //获取根节点下的,当天日期
    buff.append(date+"\n");
    //遍历results节点
      while (iter.hasNext()) {
      Element recordEle = (Element) iter.next();
      Iterator iters = recordEle.elementIterator("weather_data"); //
    //遍历results节点下的weather_data节点
      while (iters.hasNext()) {
        Element itemEle = (Element) iters.next();  
        listdate=itemEle.elements("date");
      //将date集合放到listdate中
        listday=itemEle.elements("dayPictureUrl");
        listweather=itemEle.elements("weather");
        listwind=itemEle.elements("wind");
        listtem=itemEle.elements("temperature");
    }    
    for(int i=0; i < listdate.size();i++){     //由于每一个list.size都相等,这里统一处理
      Element eledate=(Element)listdate.get(i); //依次取出date
      Element eleday=(Element)listday.get(i);//..
      Element eleweather=(Element)listweather.get(i);
      Element elewind=(Element)listwind.get(i);
      Element eletem=(Element)listtem.get(i);            
      buff.append(eledate.getText()+"==="+eleweather.getText()+"==="+elewind.getText()+"==="+eletem.getText()+"\n");  //拼接信息
        //*****************如果想用到微信公众号上,还请自己继续写代码,我只能帮到这了,数据已经分离开了。
      //微信天气处理  省略
    }  
    }
    } catch (DocumentException e) {
    e.printStackTrace();
    } catch (Exception e) {
    e.printStackTrace();
    }
    return buff.toString();  
}
    public static void main(String[] args){
    //测试
    System.out.println(GetWeater("郑州").toString());
    }
}

测试结果: 2014-04-29

周二(今天, 实时:20℃)===晴===微风===13℃

周三===晴===微风===28 ~ 15℃

周四===多云转阴===微风===30 ~ 15℃

周五===阴转多云===微风===25 ~ 15℃

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