微信公眾平臺開發(三)位置信息的識別
作者：qiyadeng
微信公眾平臺是騰訊公司在微信的基礎上新增的功能模塊，通過這一平臺，個人和企業都可以打造一個微信的公眾號，并實現和特定群體的文字、圖片、語音的全方位溝通、互動。
位置識別這是實際應用經常應用的消息，特別是很多商家，通過了解用戶位置，給用戶提供特別的產品或是商場的推薦。其中用戶可能發送兩種類型的消息：
1.微信地理位置信息
2.路名、標志性建筑或是商場名稱
1.微信地理位置消息
認識一下，微信地理位置消息，包含一些什么信息
- <xml>
- <ToUserName><![CDATA[toUser]]></ToUserName>
- <FromUserName><![CDATA[fromUser]]></FromUserName>
- <CreateTime>1351776360</CreateTime>
- <MsgType><![CDATA[location]]></MsgType>
- <Location_X>23.134521</Location_X>
- <Location_Y>113.358803</Location_Y>
- <Scale>20</Scale>
- <Label><![CDATA[位置信息]]></Label>
- <MsgId>1234567890123456</MsgId>
- </xml>
包含的主要信息有經度緯度和Label的位置?？梢愿鶕abel中描述的位置信息，提供給用戶對應的服務。也可根據用戶的經度緯度信息，提供你最近的產品或是有地域性的產品。
首先根據微信的地理位置信息，定義WeChatLocationMessage類，并能把Xml轉換為WeChatLocationMessage對象
- public class WeChatLocationMessage {
- private String toUserName;
- private String fromUserName;
- private String createTime;
- private String msgType;
- private String locationx;
- private String localtiony;
- private String scale;
- private String label;
- private String msgId;
- public static WeChatLocationMessage getWeChatLocationMessage(String xml){
- XStream xstream = new XStream(new DomDriver());
- WeChatLocationMessage message = null;
- xstream.alias("xml", WeChatLocationMessage.class);
- xstream.aliasField("ToUserName", WeChatLocationMessage.class, "toUserName");
- xstream.aliasField("FromUserName", WeChatLocationMessage.class, "fromUserName");
- xstream.aliasField("CreateTime", WeChatLocationMessage.class, "createTime");
- xstream.aliasField("MsgType", WeChatLocationMessage.class, "msgType");
- xstream.aliasField("Location_X", WeChatLocationMessage.class, "locationx");
- xstream.aliasField("Location_Y", WeChatLocationMessage.class, "localtiony");
- xstream.aliasField("Scale", WeChatLocationMessage.class, "scale");
- xstream.aliasField("Label", WeChatLocationMessage.class, "label");
- xstream.aliasField("MsgId", WeChatLocationMessage.class, "msgId");
- message = (WeChatLocationMessage)xstream.fromXML(xml);
- return message;
- }
- //getter and setter
- }
本文利用百度的地圖API，查找最近的銀行做為示例。
- public String getPalace(String query,String lat,String lng) throws ClientProtocolException, IOException{
- HttpClient httpClient = new DefaultHttpClient();
- String url = palceRequestUrl(query,lat,lng);
- logger.log(Level.INFO, url);
- HttpGet httpget = new HttpGet(url);
- ResponseHandler<String> responseHandler = new BasicResponseHandler();
- String responseBody = httpClient.execute(httpget, responseHandler);
- logger.log(Level.INFO,"baidu response:"+responseBody);
- return responseBody;
- }
- public String palceRequestUrl(String query,String lat,String lng) throws UnsupportedEncodingException {
- String url = WeChatConstant.BASEURL + "place/search?query=" + URLEncoder.encode(query,"UTF-8") + "&key="
- + WeChatConstant.MAPKEY +"&location="+lat+","+lng +"&radius=2000"+"&output=" + WeChatConstant.OUTPUTFORMAT;
- return url;
- }
輸出的結果
- <PlaceSearchResponse>
- <status>OK</status>
- <results>
- <result>
- <name>中國工商銀行東長安街支行</name>
- <location>
- <lat>39.915891</lat>
- <lng>116.41867</lng>
- </location>
- <address>東城區東長安街1號東方廣場西三辦公樓1樓</address>
- <uid>a025683c73033c35a21de987</uid>
- <detail_url>http://api.map.baidu.com/place/detail?uid=a025683c73033c35a21de987&amp;output=html&amp;source=placeapi
- </detail_url>
- <tag>銀行,王府井/東單</tag>
- </result>
- </results>
- </PlaceSearchResponse>
接下來，把百度地圖反映出來的最近位置信息，以圖文消息的格式展示給微信用戶
- public static String getWeChatReplyNewsMessageByBaiduPlace(List<BaiduPlaceResponse> placeList, double lat, double lng,String userName, int size){
- WeChatReplyNewsMessage newsMessage = new WeChatReplyNewsMessage();
- List<Item> items = new ArrayList<Item>();
- StringBuffer strBuf = new StringBuffer();
- logger.log(Level.INFO,"placeList count="+placeList.size());
- newsMessage.setItems(items);
- if(placeList.size()>size){
- newsMessage.setArticleCount(size);
- }
- else{
- newsMessage.setArticleCount(placeList.size());
- }
- logger.log(Level.INFO,"article count="+newsMessage.getArticleCount());
- newsMessage.setCreateTime(new Date().getTime()+"");
- newsMessage.setMsgType("news");
- newsMessage.setFuncFlag("0");
- newsMessage.setToUserName(userName);
- newsMessage.setFromUserName(WeChatConstant.FROMUSERNAME);
- for(int i = 0;i <newsMessage.getArticleCount();i++){
- BaiduPlaceResponse place = placeList.get(i);
- Double distance = GeoUtil.DistanceOfTwoPoints(Double.valueOf(place.getLng()), Double.valueOf(place.getLat()), lng, lat, GaussSphere.Beijing54);
- Item item = new Item();
- item.setTitle(place.getName()+"["+distance+"米]"+"\n"+place.getAddress()+"\n"+place.getTelephone());
- item.setPicUrl("");
- item.setUrl(place.getDetailUrl());
- item.setDescription("");
- items.add(item);
- }
- logger.log(Level.INFO,"newMessage="+newsMessage.toString());
- strBuf = strBuf.append(getWeChatNewsMessage(newsMessage));
- return strBuf.toString();
- }
- public static String getWeChatNewsMessage(WeChatReplyNewsMessage newsMessage){
- XStream xstream = new XStream(new DomDriver());
- xstream.alias("xml", WeChatReplyNewsMessage.class);
- xstream.aliasField("ToUserName", WeChatReplyNewsMessage.class, "toUserName");
- xstream.aliasField("FromUserName", WeChatReplyNewsMessage.class, "fromUserName");
- xstream.aliasField("CreateTime", WeChatReplyNewsMessage.class, "createTime");
- xstream.aliasField("MsgType", WeChatReplyNewsMessage.class, "msgType");
- xstream.aliasField("ArticleCount", WeChatReplyNewsMessage.class, "articleCount");
- xstream.aliasField("Content", WeChatReplyNewsMessage.class, "content");
- xstream.aliasField("FuncFlag", WeChatReplyNewsMessage.class, "funcFlag");
- xstream.aliasField("Articles", WeChatReplyNewsMessage.class, "items");
- xstream.alias("item", Item.class);
- xstream.aliasField("Title", Item.class, "title");
- xstream.aliasField("Description", Item.class, "description");
- xstream.aliasField("PicUrl", Item.class, "picUrl");
- xstream.aliasField("Url", Item.class, "url");
- return xstream.toXML(newsMessage);
- }
別走開，下頁更勁爆~
#p#
2.路名、標志性建筑或是商場名稱
對路名、標志性建筑等信息，方法還是通過第三方地圖信息，確定輸入的位置信息的經度緯度。
本文使用百度地圖API，確定所查找的位置的經度和緯度。
- public String getGeoCode(String query) throws ClientProtocolException, IOException{
- HttpClient httpClient = new DefaultHttpClient();
- String url = geoCodeRequestUrl(query);
- logger.log(Level.INFO, url);
- HttpGet httpget = new HttpGet(url);
- ResponseHandler<String> responseHandler = new BasicResponseHandler();
- String responseBody = httpClient.execute(httpget, responseHandler);
- logger.log(Level.INFO,"baidu response:"+responseBody);
- return responseBody;
- }
- public String geoCodeRequestUrl(String query) throws UnsupportedEncodingException{
- String url = WeChatConstant.BASEURL + "geocoder?address=" + URLEncoder.encode(query,"UTF-8") + "&key="
- + WeChatConstant.MAPKEY + "&output=" + WeChatConstant.OUTPUTFORMAT;
- return url;
- }
確定了經度和緯度，問題就變成和第1種消息類型一致了，根據經度緯度去做相應處理。
3.源代碼
本文的代碼較長，提供源代碼下載
WeChatDemo下載
閱讀第一篇：微信公眾平臺開發（一）平臺綜述
閱讀第二篇：微信公眾平臺開發（二）簡單的聊天機器人
本文鏈接地址: 微信公眾平臺開發（三）–位置信息的識別
責任編輯：閆佳明
來源：
cnblogs
