结合百度云平台和微信公众平台开发（二）

距离第一章的入门讲解已经有一段时间了，最近的确没有空，今天我们在上一次的基础上来进行一个扩展，实现天气查询功能，大概就是，我们在手机上想我们的公众账号发送一个消息，比如“weather”，服务器获取当前天气进行返回给手机客户端，（大家可以关注我的公众账号测试效果，左边个人资料有二维码。注*此功能已经在第三章《结合百度云平台和微信公众平台开发（三）》升级，取消了Weather关键字，改为“天气北京”，“天气南京”类的定点查询）如下图：

首先要声明的是，天气的获取有很多种方法，但我们最好是使用WebXml这个网站提供我们的数据，更新快，不涉及侵权，非常好用的地址是：点击打开链接

入口类没有什么变化，就是多了一个字符判断而已，这里就不贴完整代码了，大家可以参考上一篇：

//微信客户端发送time，服务器解析到后返回当前时间            else if(keyword.equals("time")){            contentStr = GetTime.getTime();            }else if(keyword.equals("weather")){            contentStr = GetTime.getTime()+"~~"+Weather.getWeather();    }  

下面说说获取天气的代码实现：

package com.weixin.zfeng.utils;import java.io.IOException;import java.io.InputStream;import java.io.UnsupportedEncodingException;import java.net.MalformedURLException;import java.net.URL;import java.net.URLConnection;import java.util.ArrayList;import java.util.Date;import java.util.List;import javax.xml.parsers.DocumentBuilder;import javax.xml.parsers.DocumentBuilderFactory;import javax.xml.parsers.ParserConfigurationException;import org.w3c.dom.DOMException;import org.w3c.dom.Document;import org.w3c.dom.Node;import org.w3c.dom.NodeList;import org.xml.sax.SAXException;public class Weather {private static String SERVICES_HOST = "www.webxml.com.cn";private static String WEATHER_SERVICES_URL = "http://webservice.webxml.com.cn/WebServices/WeatherWS.asmx/";private static String WEATHER_QUERY_URL = WEATHER_SERVICES_URL+ "getWeather?theUserID=&theCityCode=";/** * 城市代码 / 镇江: 1954 *///这里是通过城市对应的代码来实现查询的，全国各个城市代码号，大家可以在官方网站看到，实际开发是，需要将它们全部拿来private static int CITICODE = 1954;public static String getWeather(){String desc = "今天是" + DateUtils.getYear() + ","+ DateUtils.getWeekOfDate(new Date());desc += new Weather().getWeatherStr();return desc;}public InputStream getSoapInputStream(String url) {InputStream inputStream = null;try {URL urlObj = new URL(url);URLConnection urlConn = urlObj.openConnection();urlConn.setRequestProperty("Host", SERVICES_HOST); // 具体webService相关urlConn.connect();inputStream = urlConn.getInputStream();} catch (MalformedURLException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}return inputStream;}public String getWeatherStr() {String desc = "";try {List<String> weatherList = getWeather(CITICODE);if (weatherList != null && weatherList.size() > 7) {String tianqi = weatherList.get(7);if (tianqi.contains("日")) {tianqi = tianqi.substring(tianqi.indexOf("日") + 1);}String wendu = weatherList.get(8);desc += ",天气" + tianqi;desc += " ,";desc += wendu.replace("℃", "度").replace("/", "--");}} catch (Exception e) {e.printStackTrace();return desc;}return desc;}public List<String> getWeather(int cityCode) {List<String> weatherList = new ArrayList<String>();Document document;DocumentBuilderFactory documentBF = DocumentBuilderFactory.newInstance();documentBF.setNamespaceAware(true);try {DocumentBuilder documentB = documentBF.newDocumentBuilder();InputStream inputStream = getSoapInputStream(WEATHER_QUERY_URL+ cityCode);document = documentB.parse(inputStream);NodeList nl = document.getElementsByTagName("string");int len = nl.getLength();for (int i = 0; i < len; i++) {Node n = nl.item(i);String weather = n.getFirstChild().getNodeValue();weatherList.add(weather);}inputStream.close();} catch (UnsupportedEncodingException e) {e.printStackTrace();} catch (DOMException e) {e.printStackTrace();} catch (ParserConfigurationException e) {e.printStackTrace();} catch (SAXException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}return weatherList;}//大家务必在此测试一下后哦//public static void main(String[] args) {//System.out.println(Weather.getWeather());//}}

就这么多，很简单的，上一次我忘记在入口类中处理编码问题，这样汉字会出现乱码，大家记住改一下：

req.setCharacterEncoding("UTF-8");resp.setCharacterEncoding("UTF-8");

文章转载须注明出处：http://blog.csdn.net/fengfeng91