聯網請求數據：微信篇

這篇文章主要回顧WeiXinMY微信查詢公衆號是如何聯網請求成績。

第一部分：建立菜單

一、拿到APPID和ACCESS_TOKEN_URL，經過doGetStr方法請求jsonObject獲取token，此處token是以後建立菜單必須參數。

public class WeiXinUtil {
    private static final String APPID = "wx1ba5329fcb5a3b62";
    private static final String APPSECRET = "e80f628a6be76d02aa847fce805b801b";
    private static final String ACCESS_TOKEN_URL = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=APPID&secret=APPSECRET";
    private static final String CREATE_MENU_URL = "https://api.weixin.qq.com/cgi-bin/menu/create?access_token=ACCESS_TOKEN";

    //get請求
    public static JSONObject doGetStr(String url){
        DefaultHttpClient httpClient = new DefaultHttpClient();
        HttpGet httpGet = new HttpGet(url);
        JSONObject jsonObject = null;
        try {
            HttpResponse response = httpClient.execute(httpGet);
            HttpEntity entity = response.getEntity();
            if(entity!=null){
                String result = EntityUtils.toString(entity,"UTF-8");
                jsonObject = JSONObject.fromObject(result);
            }
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return jsonObject;
    }

    //post請求
    public static JSONObject doPostStr(String url,String outStr){
        DefaultHttpClient httpClient = new DefaultHttpClient();
        HttpPost httpPost = new HttpPost(url);
        JSONObject jsonObject = null;
        try {
            httpPost.setEntity(new StringEntity(outStr,"UTF-8"));
            HttpResponse response = httpClient.execute(httpPost);
            String result = EntityUtils.toString(response.getEntity(),"UTF-8");
            jsonObject = JSONObject.fromObject(result);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return jsonObject;
    }

    //獲取access_token
    public static AccessToken getAccessToken(){
        AccessToken token = new AccessToken();
        String url = ACCESS_TOKEN_URL.replace("APPID", APPID).replace("APPSECRET", APPSECRET);
        JSONObject jsonObject = doGetStr(url);
        if(jsonObject!=null){
            token.setToken(jsonObject.getString("access_token"));
            token.setExpiresIn(jsonObject.getInt("expires_in"));
        }
        return token;
    }
}

二、組裝菜單和建立菜單

//組裝菜單
    public static Menu initMenu(){
        Menu menu = new Menu();
        ClickButton button11 = new ClickButton();
        button11.setName("所有成績");
        button11.setType("click");
        button11.setKey("11");

        ClickButton button12 = new ClickButton();
        button12.setName("必修課績點");
        button12.setType("click");
        button12.setKey("12");

        Button button1 = new Button();
        button1.setName("查詢成績");
        button1.setSub_button(new Button[]{button11,button12});

        ViewButton button21 = new ViewButton();
        button21.setName("綁定學號");
        button21.setType("view");
        button21.setUrl("http://ap18458589.iok.la/WeiXinMY/index.jsp");

        ClickButton button22 = new ClickButton();
        button22.setName("重置");
        button22.setType("click");
        button22.setKey("22");

        Button button2 = new Button();
        button2.setName("學號管理");
        button2.setSub_button(new Button[]{button21,button22});

        ClickButton button31 = new ClickButton();
        button31.setName("掃碼");
        button31.setType("scancode_push");
        button31.setKey("31");

        ClickButton button32 = new ClickButton();
        button32.setName("地理位置");
        button32.setType("location_select");
        button32.setKey("32");

        Button button3 = new Button();
        button3.setName("功能菜單");
        button3.setSub_button(new Button[]{button31,button32});

        menu.setButton(new Button[]{button1,button2,button3});
        return menu;
    }

    public static int createMenu(String token,String menu){
        int result = 0;
        String url = CREATE_MEN_URL.replace("ACCESS_TOKEN", token);
        JSONObject jsonObject = doPostStr(url,menu);
        if(jsonObject != null){
            result = jsonObject.getInt("errcode");
        }
        return result;
    }

三、WeiXinTest.java用於獲取token建立菜單

package com.myangtzeu.test;

import java.util.ArrayList;
import java.util.List;

import com.myangtzeu.menu.Menu;
import com.myangtzeu.pojo.AccessToken;
import com.myangtzeu.utils.SpiderUtil;
import com.myangtzeu.utils.WeiXinUtil;

import net.sf.json.JSONObject;

public class WeiXinTest {
    public static void main(String[] args) {
        try {
            AccessToken token = WeiXinUtil.getAccessToken();
            System.out.println("票據："+token.getToken());
            System.out.println("有效時間："+token.getExpiresIn());

            String menu = JSONObject.fromObject(WeiXinUtil.initMenu()).toString();
            System.out.println(menu);
            int result = WeiXinUtil.createMenu(token.getToken(), menu);
            if(result==0){
                System.out.println("建立菜單成功");
            }else{
                System.out.println("錯誤碼："+result);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

第二部分：請求數據

一、MessageUtil，初始化成績查詢事件，返回xml，爬蟲和具體代碼詳見github。

//所有成績事件
    public static String initCj(String toUserName,String fromUserName,String account,String password){
        String message = null;
        List<News> newsList = new ArrayList<News>();
        NewsMessage newsMessage = new NewsMessage();

        News news = new News();
        news.setTitle("您的所有成績以下：");

        SpiderUtil su = new SpiderUtil();
        List<String> list = new ArrayList<String>();
        su.spiderCj(account, password, list);
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < list.size(); i++) {
            sb.append(list.get(i));
            if(i%2 == 0){
                sb.append(":");
            }else{
                sb.append("\n");
            }
        }
        news.setDescription(sb.toString()+"\n\n"+"回覆【所有成績】查全部成績\n"+"回覆【績點】查看績點\n"+"回覆【重置】從新綁定學號");
//        news.setPicUrl("http://ap18458589.iok.la/WeiXinMY/WebRoot/image/IMG_6497.PNG");
        news.setUrl("www.yuol.online:8080");
        newsList.add(news);
        newsMessage.setToUserName(fromUserName);
        newsMessage.setFromUserName(toUserName);
        newsMessage.setCreateTime(new Date().getTime());
        newsMessage.setMsgType(MESSAGE_NEWS);
        newsMessage.setArticles(newsList);
        newsMessage.setArticleCount(newsList.size());

        message = newsMessageToXml(newsMessage);
        return message;
    }

二、經過監聽MESSAGE_CLICK，實現成績消息推送

package com.myangtzeu.servlet;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Map;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import com.myangtzeu.utils.CheckUtil;
import com.myangtzeu.utils.MessageUtil;

public class WeiXinServlet extends HttpServlet {

    public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        
        String signature = request.getParameter("signature");
        String timestamp = request.getParameter("timestamp"); 
        String nonce = request.getParameter("nonce"); 
        String echostr = request.getParameter("echostr");
        
        PrintWriter out = response.getWriter(); 
        if(CheckUtil.checkSignature(signature, timestamp, nonce)){
            out.print(echostr);
        }
    }
    
    public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        
        request.setCharacterEncoding("UTF-8");
        response.setCharacterEncoding("UTF-8");
        PrintWriter out = response.getWriter();
        try {
            Map<String,String> map = MessageUtil.xmlToMap(request);
            String fromUserName = map.get("FromUserName");
            String toUserName = map.get("ToUserName");
            String msgType = map.get("MsgType");
            String content = map.get("Content");
            String message = null;
            if(MessageUtil.MESSAGE_TEXT.equals(msgType)){
                if("1".equals(content)){
                    message = MessageUtil.initText(toUserName, fromUserName, MessageUtil.firstMenu());                    
                }else if("2".equals(content)){
                    message = MessageUtil.initText(toUserName, fromUserName, MessageUtil.secondMenu());                    
                }else if("M".equals(content) || "m".equals(content)){
                    message = MessageUtil.initText(toUserName, fromUserName, MessageUtil.menuText());
                }
//                TextMessage text = new TextMessage();
//                text.setFromUserName(toUserName);
//                text.setToUserName(fromUserName);
//                text.setMsgType("text");
//                text.setCreateTime(new Date().getTime());
//                text.setContent("�����͵���Ϣ�ǣ�"+content);
//                message = MessageUtil.textMessageToXml(text);
            }else if(MessageUtil.MESSAGE_EVENT.equals(msgType)){
                String eventType = map.get("Event");
                String eventKey = map.get("EventKey");
                if(MessageUtil.MESSAGE_SUBSCRIBE.equals(eventType)){
                    message = MessageUtil.initText(toUserName, fromUserName, MessageUtil.menuText());
                }else if(MessageUtil.MESSAGE_CLICK.equals(eventType)){
                    if(eventKey.equals("11")){
                        HttpSession session = request.getSession();
                        String account = (String) session.getAttribute("account");
                        String password = (String) session.getAttribute("password");
                        message = MessageUtil.initCj(toUserName, fromUserName, account, password);
                        System.out.println(account);
                    }else if(eventKey.equals("12")){
                        message = MessageUtil.initJd(toUserName, fromUserName);
                    }else if(eventKey.equals("22")){
                        response.sendRedirect("InvalidateServlet");
                        message = MessageUtil.initCz(toUserName, fromUserName);                         
                    }
                }else if(MessageUtil.MESSAGE_VIEW.equals(eventType)){
                    String url = map.get("EventKey");
                    message = MessageUtil.initText(toUserName, fromUserName, url);
                }else if(MessageUtil.MESSAGE_SCANCODE.equals(eventType)){
                    String key = map.get("EventKey");
                    message = MessageUtil.initText(toUserName, fromUserName, key);
                }
            }else if(MessageUtil.MESSAGE_LOCATION.equals(msgType)){
                String label = map.get("Label");
                message = MessageUtil.initText(toUserName, fromUserName, label);
            }
            out.print(message);
        } catch (Exception e) {
            e.printStackTrace();
        }finally{
            out.close();
        }
    }
}