06、生成带参数的二维码

https://mp.weixin.qq.com/wiki?t=resource/res_main&id=mp1443433542
生成带参数的二维码

为了满足用户渠道推广分析和用户帐号绑定等场景的需要，公众平台提供了生成带参数二维码的接口。使用该接口可以获得多个带不同场景值的二维码，用户扫描后，公众号可以接收到事件推送。

目前有2种类型的二维码：

1、临时二维码，是有过期时间的，最长可以设置为在二维码生成后的30天（即2592000秒）后过期，但能够生成较多数量。临时二维码主要用于帐号绑定等不要求二维码永久保存的业务场景
2、永久二维码，是无过期时间的，但数量较少（目前为最多10万个）。永久二维码主要用于适用于帐号绑定、用户来源统计等场景。
用户扫描带场景值二维码时，可能推送以下两种事件：
如果用户还未关注公众号，则用户可以关注公众号，关注后微信会将带场景值关注事件推送给开发者。
如果用户已经关注公众号，在用户扫描后会自动进入会话，微信也会将带场景值扫描事件推送给开发者。

package com.lm.action.accessToken;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.lm.conf.WechatConf;
import com.lm.conf.WechatUrl;
import com.lm.util.HttpConnectionUtil;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

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

/**
 * 自定义二维码
 */
@RestController
@RequestMapping("/qrcode")
public class QrcodeAction {

    /**
     * 创建
     */
    @GetMapping("/create")
    public String create() {
        //临时二维码(永久的获取方法一致)
        String url = "https://api.weixin.qq.com/cgi-bin/qrcode/create?access_token=" + WechatConf.ACCESSTOKEN;
        String jsonStr = "{\"expire_seconds\": 604800, \"action_name\": \"QR_SCENE\", \"action_info\": {\"scene\": {\"scene_id\": 123}}}";
        String resultJson = HttpConnectionUtil.post(url, jsonStr);
        System.out.println(resultJson);
//        JSONObject jsonObject = JSONObject.parseObject(resultJson);
//        String ticketUrl = "https://mp.weixin.qq.com/cgi-bin/showqrcode?ticket=" + jsonObject.get("ticket");
//        String resiltStr = HttpConnectionUtil.get(ticketUrl);
//        System.out.println(resiltStr);
        return "success";
    }

}

package com.lm.util;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Map;

public class HttpConnectionUtil {
    //get请求
    public static String get(String url){
        HttpURLConnection conn = null;
        BufferedReader rd = null ;
        StringBuilder sb = new StringBuilder ();
        String line = null ;
        String response = null;
        try {
            conn = (HttpURLConnection) new URL(url).openConnection();
            conn.setRequestMethod("GET");
            conn.setDoInput(true);
            conn.setReadTimeout(20000);
            conn.setConnectTimeout(20000);
            conn.setUseCaches(false);
            conn.connect();
            rd  = new BufferedReader( new InputStreamReader(conn.getInputStream(), "UTF-8"));
            while ((line = rd.readLine()) != null ) {
                sb.append(line);
            }
            response = sb.toString();
        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }finally{
            try {
                if(rd != null){
                    rd.close();
                }
                if(conn != null){
                    conn.disconnect();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return response;
    }
    //post表单请求
    public static String post(String url, Map form){
        HttpURLConnection conn = null;
        PrintWriter pw = null ;
        BufferedReader rd = null ;
        StringBuilder out = new StringBuilder();
        StringBuilder sb = new StringBuilder();
        String line = null ;
        String response = null;
        for (String key : form.keySet()) {
            if(out.length()!=0){
                out.append("&");
            }
            out.append(key).append("=").append(form.get(key));
        }
        try {
            conn = (HttpURLConnection) new URL(url).openConnection();
            conn.setRequestMethod("POST");
            conn.setDoOutput(true);
            conn.setDoInput(true);
            conn.setReadTimeout(20000);
            conn.setConnectTimeout(20000);
            conn.setUseCaches(false);
            conn.connect();
            pw = new PrintWriter(conn.getOutputStream());
            pw.print(out.toString());
            pw.flush();
            rd  = new BufferedReader( new InputStreamReader(conn.getInputStream(), "UTF-8"));
            while ((line = rd.readLine()) != null ) {
                sb.append(line);
            }
            response = sb.toString();
        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }finally{
            try {
                if(pw != null){
                    pw.close();
                }
                if(rd != null){
                    rd.close();
                }
                if(conn != null){
                    conn.disconnect();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return response;
    }
    //post字符串请求
    public static String post(String url, String rawBody){
        HttpURLConnection conn = null;
        PrintWriter pw = null ;
        BufferedReader rd = null ;
        StringBuilder sb = new StringBuilder ();
        String line = null ;
        String response = null;
        try {
            conn = (HttpURLConnection) new URL(url).openConnection();
            conn.setRequestMethod("POST");
            conn.setDoOutput(true);
            conn.setDoInput(true);
            conn.setReadTimeout(20000);
            conn.setConnectTimeout(20000);
            conn.setUseCaches(false);
            conn.connect();
            pw = new PrintWriter(conn.getOutputStream());
            pw.print(rawBody);
            pw.flush();
            rd  = new BufferedReader( new InputStreamReader(conn.getInputStream(), "UTF-8"));
            while ((line = rd.readLine()) != null ) {
                sb.append(line);
            }
            response = sb.toString();
        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }finally{
            try {
                if(pw != null){
                    pw.close();
                }
                if(rd != null){
                    rd.close();
                }
                if(conn != null){
                    conn.disconnect();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return response;
    }

}

//未关注扫描推送（事件为关注事件Event）
<xml>
    <ToUserName>ToUserName>
    <FromUserName>FromUserName>
    <CreateTime>1514986796CreateTime>
    <MsgType>MsgType>
    <Event>Event>
    <EventKey>EventKey>
    <Ticket>Ticket>
xml>

//已经关注了扫描推送（事件为扫描Event）
<xml>
    <ToUserName>ToUserName>
    <FromUserName>FromUserName>
    <CreateTime>1514986391CreateTime>
    <MsgType>MsgType>
    <Event>Event>
    <EventKey>EventKey>
    <Ticket>Ticket>
xml>