1.微信地理位置消息

认识一下，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>

包含的主要信息有经度纬度和Label的位置。可以根据label中描述的位置信息，提供给用户对应的服务。也可根据用户的经度纬度信息，提供你最近的产品或是有地域性的产品。

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首先根据微信的地理位置信息，定义WeChatLocationMessage类，并能把Xml转换为WeChatLocationMessage对象

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 
}

本文利用百度的地图API，查找最近的银行做为示例。

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; 
}

输出的结果

<PlaceSearchResponse> 
    <status>OK</status> 
    <results> 
        <result> 
            <name>中国工商银行东长安街支行</name> 
            <location> 
                <lat>39.915891</lat> 
                <lng>116.41867</lng> 
            </location> 
            <address>东城区东长安街1号东方广场西三办公楼1楼</address> 
            <uid>a025683c73033c35a21de987</uid> 
            <detail_url>http://api.map.baidu.com/place/detail?uid=a025683c73033c35a21de987&amp;amp;output=html&amp;amp;source=placeapi 
            </detail_url> 
            <tag>银行,王府井/东单</tag> 
        </result> 
      </results> 
</PlaceSearchResponse>

接下来，把百度地图反映出来的最近位置信息，以图文消息的格式展示给微信用户

    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); 
    }

别走开，下页更劲爆~

#p#

2.路名、标志性建筑或是商场名称

对路名、标志性建筑等信息，方法还是通过第三方地图信息，确定输入的位置信息的经度纬度。

本文使用百度地图API，确定所查找的位置的经度和纬度。

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; 
    }