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）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();
	    }  

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());
//	}
}

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