百度天气预报API的使用（java版本）

转自新浪sae论坛，都是我自己写的，所以在这里也属于原创。http://cloudbbs.org/forum.php?mod=viewthread&tid=23175

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=郑州&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℃