微信公众平台之超简单实用的天气预报后台实现

        概述，前段时间我在开发一个自己的微信公众平台，需要实现天气预报功能，在网上度娘了下，实现天气预报的接口API还蛮多的，有：中国气象局、雅虎和新浪等，中国天气预报接口需要全国的编码，雅虎的有时候访问不了，研究了下还是新浪提供的接口比较简单实用。新浪天气预报API的URL是http://php.weather.sina.com.cn/xml.php?city=%B1%B1%BE%A9&password=DJOYnieT8234jlsK&day=0。其中，city后的城市转码。Password固定，Day为0表示当天天气，1表示第二天的天气，2表示第三天的天气，以此类推，最大为4。返回的XML，说明如下：

<Profiles>
<Weather>
<city>广州</city>
<status1>晴</status1>
<status2>晴</status2>
<figure1>qing</figure1>
<figure2>qing</figure2>
<direction1>无持续风向</direction1>
<direction2>无持续风向</direction2>
<power1>≤3</power1>
<power2>≤3</power2>
<temperature1>7</temperature1>
<temperature2>-5</temperature2>
<ssd>0</ssd>
<tgd1>7</tgd1>
<tgd2>7</tgd2>
<zwx>2</zwx>
<ktk>7</ktk>
<pollution>3</pollution>
<xcz></xcz>
<zho></zho>
<diy></diy>
<fas></fas>
<chy>6</chy>
<zho_shuoming>暂无</zho_shuoming>
<diy_shuoming>暂无</diy_shuoming>
<fas_shuoming>暂无</fas_shuoming>
<chy_shuoming>棉衣、冬大衣、皮夹克、内着衬衫或羊毛内衣、毛衣、外罩大衣</chy_shuoming>
<pollution_l>一般</pollution_l>
<zwx_l>弱</zwx_l>
<ssd_l>较凉</ssd_l>
<fas_l>暂无</fas_l>
<zho_l>暂无</zho_l>
<chy_l>薄冬衣</chy_l>
<ktk_l>建议开启(制热)</ktk_l>
<xcz_l>暂无</xcz_l>
<diy_l>暂无</diy_l>
<pollution_s>对空气污染物扩散无明显影响</pollution_s>
<zwx_s>紫外线弱</zwx_s>
<ssd_s>老年、幼儿、体弱者外出需要带上薄围巾、薄手套。</ssd_s>
<ktk_s>建议开启空调</ktk_s>
<xcz_s>暂无</xcz_s>
<gm>2</gm>
<gm_l>易发期</gm_l>
<gm_s>天气很凉，季节转换的气候，慎重增加衣服；较易引起感冒；</gm_s>
<yd>5</yd>
<yd_l>不适宜</yd_l>
<yd_s>虽然晴空万里，但是户外运动时会感到很凉；</yd_s>
<savedate_weather>2013-03-01</savedate_weather>
<savedate_life>2013-03-01</savedate_life>
<savedate_zhishu>2013-03-01</savedate_zhishu>
</Weather>
</Profiles>

1、weather服务类

package com.mghs.service;

import java.io.UnsupportedEncodingException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import com.mghs.util.GetAppConfUtil;
import com.mghs.util.HttpRequestUtil;

/**
 * 天气预报服务
 * @author lanp
 * @since 2014-7-29 20:56:16
 * @version v1.0.1
 */
public class WeatherService {
	
	
	/**
	 * GBK编码
	 * @param source
	 * @return
	 */
	public static String urlEncodeGBK(String source) {
		String result = source;
		try {
			result = java.net.URLEncoder.encode(source, "GBK");
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		}
		return result;
	}
	
	/**
	 * 获取天气预报XML信息并返回
	 * @param source
	 * @return
	 */
	public static String getWeatherXml(String source,int day) {
		String dst = null;
		// 组装查询地址
		String requestUrl = "http://php.weather.sina.com.cn/xml.php?city={keyWord}&password=DJOYnieT8234jlsK&day="+day;
		// 对参数q的值进行urlEncode utf-8编码
		requestUrl = requestUrl.replace("{keyWord}", HttpRequestUtil.urlEncode(source, "GBK"));
		dst = HttpRequestUtil.httpRequest(requestUrl);
		return dst;
	}
	
	/**
	 * 获取今天、明天和后天的天气预报信息并返回
	 * @param source
	 * @return
	 */
	public static String getWeatherInfo(String source) {
		StringBuffer buffer = new StringBuffer();
		buffer.append(source).append(" 今明后三天天气情况如下：\n\n");
		for(int i=0;i<3;i++) {
			String weatherXml = getWeatherXml(source,i);
			if(null==weatherXml || "".equals(weatherXml))
				return "";
			String status1 = "";
			String direction1 = "";
			String temperature1 = "";
			String temperature2 = ""; 
			String savedate_weather = "";
			String ssd_l = "";
			String yd_s = "";
			Pattern p = Pattern.compile("(.*)(<status1>)(.*?)(</status1>)(.*)");
			Matcher m = p.matcher(weatherXml);
			if(m.matches())
				status1 = m.group(3);
			if(null==status1 || "".endsWith(status1))
				return "";
			p = Pattern.compile("(.*)(<direction1>)(.*?)(</direction1>)(.*)");
			m = p.matcher(weatherXml);
			if(m.matches())
				direction1 = m.group(3);
			p = Pattern.compile("(.*)(<temperature1>)(.*?)(</temperature1>)(.*)");
			m = p.matcher(weatherXml);
			if(m.matches())
				temperature1 = m.group(3);
			p = Pattern.compile("(.*)(<temperature2>)(.*?)(</temperature2>)(.*)");
			m = p.matcher(weatherXml);
			if(m.matches())
				temperature2 = m.group(3);
			p = Pattern.compile("(.*)(<savedate_weather>)(.*?)(</savedate_weather>)(.*)");
			m = p.matcher(weatherXml);
			if(m.matches())
				savedate_weather = m.group(3);
			p = Pattern.compile("(.*)(<ssd_l>)(.*?)(</ssd_l>)(.*)");
			m = p.matcher(weatherXml);
			if(m.matches())
				ssd_l = m.group(3);
			p = Pattern.compile("(.*)(<yd_s>)(.*?)(</yd_s>)(.*)");
			m = p.matcher(weatherXml);
			if(m.matches())
				yd_s = m.group(3);
			buffer.append(savedate_weather).append("\n").append(status1).append(" ").append(direction1).append(" ").append(temperature2)
				.append("°-").append(temperature1).append("° ").append(ssd_l).append("\n").append("温馨提示：").append(yd_s).append("\n\n");
		}
		return (null==buffer?"":buffer.toString());
	}
	
	/**
	 * @param args
	 */
	public static void main(String[] args) {
		System.out.println(getWeatherInfo("广州"));
	}

}

2、http工具类

package com.mghs.util;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.URL;

/**
 * Http请求工具类
 * @author lanp
 * @since 2014-8-24 13:30:56
 * @version v1.0.1
 */
public class HttpRequestUtil {
	
	/**
	 * 编码
	 * @param source
	 * @return
	 */
	public static String urlEncode(String source,String encode) {
		String result = source;
		try {
			result = java.net.URLEncoder.encode(source,encode);
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
			return "0";
		}
		return result;
	}
	
	/**
	 * 发起http请求获取返回结果
	 * @param requestUrl 请求地址
	 * @return
	 */
	public static String httpRequest(String requestUrl) {
		StringBuffer buffer = new StringBuffer();
		try {
			URL url = new URL(requestUrl);
			HttpURLConnection httpUrlConn = (HttpURLConnection) url.openConnection();

			httpUrlConn.setDoOutput(false);
			httpUrlConn.setDoInput(true);
			httpUrlConn.setUseCaches(false);

			httpUrlConn.setRequestMethod("GET");
			httpUrlConn.connect();

			// 将返回的输入流转换成字符串
			InputStream inputStream = httpUrlConn.getInputStream();
			InputStreamReader inputStreamReader = new InputStreamReader(inputStream, "utf-8");
			BufferedReader bufferedReader = new BufferedReader(inputStreamReader);

			String str = null;
			while ((str = bufferedReader.readLine()) != null) {
				buffer.append(str);
			}
			bufferedReader.close();
			inputStreamReader.close();
			// 释放资源
			inputStream.close();
			inputStream = null;
			httpUrlConn.disconnect();

		} catch (Exception e) {
			System.out.println(e.getStackTrace());
		}
		return buffer.toString();
	}
	
	/**
	 * 发送http请求取得返回的输入流
	 * @param requestUrl 请求地址
	 * @return InputStream
	 */
	public static InputStream httpRequestIO(String requestUrl) {
		InputStream inputStream = null;
		try {
			URL url = new URL(requestUrl);
			HttpURLConnection httpUrlConn = (HttpURLConnection) url.openConnection();
			httpUrlConn.setDoInput(true);
			httpUrlConn.setRequestMethod("GET");
			httpUrlConn.connect();
			// 获得返回的输入流
			inputStream = httpUrlConn.getInputStream();
		} catch (Exception e) {
			e.printStackTrace();
		}
		return inputStream;
	}
}

微信公众平台之超简单实用的天气预报后台实现