微信订阅号关注回复

微信订阅号

关注和取消关注的xml

app.all('/wxserver', (req, res) => {
req.on('data',(requestBody)=>{
let xml = requestBody.toString()
console.log(xml)
})
})

会输出三次

1514954008




//unsubscribe是取消关注

解析xml的包 xml2js

作用：
会自动将xml变成对象
{ xml:
{ ToUserName: [ 'gh_2c0117a22e61' ],
FromUserName: [ 'oyugi1EtuG4F6pzRKyEDcVWT1ggc' ],
CreateTime: [ '1514955132' ],
MsgType: [ 'event' ],
Event: [ 'unsubscribe' ],
EventKey: [ '' ] } }
安装：
cnpm i xml2js -S
文档：
npm里面搜xml2js
demo:
app.all('/wxserver', (req, res) => {
req.on('data', (requestBody) => {
//接微信服务器发送过来的xml
let xml = requestBody.toString()
//解析xml
parseString(xml, function (err, result) {
console.dir(result);
});
})
})

判断：
app.all('/wxserver', (req, res) => {
req.on('data', (requestBody) => {
//接微信服务器发送过来的xml
let xml = requestBody.toString()
//解析xml
parseString(xml, function (err, result) {
console.dir(result)
let xml = result.xml
if(xml.MsgType[0] == 'event' && xml.Event[0] == 'subscribe'){
console.log('我被关注了')
}else if(xml.MsgType[0] == 'event' && xml.Event[0] == 'unsubscribe'){
console.log('我被取消关注了')
}
});
})
})

被动回复消息

参考网址：
https://mp.weixin.qq.com/wiki?t=resource/res_main&id=mp1421140543

关注时自动回复：

if (xml.MsgType[0] == 'event' && xml.Event[0] == 'subscribe') {
let gfxml = <xml> <ToUserName> <![CDATA[${xml.FromUserName}]]> </ToUserName> <FromUserName> <![CDATA[${xml.ToUserName}]]> </FromUserName> <CreateTime>12345678</CreateTime> <MsgType> <![CDATA[text]]> </MsgType> <Content> <![CDATA[谢谢您的关注！]]> </Content> </xml>
res.send(gfxml)
}

注意：
xml是严格标记语言，不允许有空格，得把空格全部去掉

配合mongoDB来返回消息

1. 抽取xml
   新建一个文件夹proccess-subscribe.js

   'use strict'
   exports.proccess = (result,res)=>{
   let gfxml = <xml> <ToUserName> <![CDATA[${result.FromUserName}]]> </ToUserName> <FromUserName> <![CDATA[${result.ToUserName}]]> </FromUserName> <CreateTime>12345678</CreateTime> <MsgType> <![CDATA[text]]> </MsgType> <Content> <![CDATA[谢谢您的关注！]]> </Content> </xml>
   res.send(gfxml)
   }

2. 在app,js中用到的地方导入

   if (xml.MsgType[0] == 'event' && xml.Event[0] == 'subscribe') {
   var gzObj = require('./proccess/subscribe.js')
   gzObj.proccess(xml,res)
   }

   3.导入mongodb

   cnpm i mongodb@2.2.33 -S //最新的版本有bug，指的是我现在这个时候的最新版本

   步骤：

   网址：
   https://www.npmjs.com/package/mongodb

   快速使用:
   ​
   'use strict'
   const MongoClient = require('mongodb').MongoClient;
   const assert = require('assert');

   exports.proccess = (result, res) => {

   // Connection URL
   const url = 'mongodb://localhost:27017';

   // Database Name
   const dbName = 'myproject';

   // Use connect method to connect to the server
   MongoClient.connect(url, function (err, client) {
   assert.equal(null, err);
   console.log("Connected successfully to server");

   const db = client.db(dbName);

   let gfxml = <xml> <ToUserName> <![CDATA[${result.FromUserName}]]> </ToUserName> <FromUserName> <![CDATA[${result.ToUserName}]]> </FromUserName> <CreateTime>12345678</CreateTime> <MsgType> <![CDATA[text]]> </MsgType> <Content> <![CDATA[谢谢您的关注！]]> </Content> </xml>
   res.send(gfxml)
   //关闭数据库链接
   client.close();
   });
   }

   打开数据库Robo

   在wxMessage表中插入insert document
   {
   'id':1
   'content':'谢谢您的关注'
   }

   后面通过查找，获取到该content
   ​
   示例代码：

   'use strict'
   const MongoClient = require('mongodb').MongoClient;
   const assert = require('assert');

   exports.proccess = (result, res) => {

   // Connection URL
   const url = 'mongodb://localhost:27017';

   // Database Name
   const dbName = 'wxdata';

   // Use connect method to connect to the server
   MongoClient.connect(url, function (err, client) {
   assert.equal(null, err);
   console.log("Connected successfully to server");

   const db = client.db(dbName);

   let collection = db.collection('wxMessage')
   collection.findOne({
   id: 1
   }, (err, doc) => {
   let gfxml = <xml> <ToUserName> <![CDATA[${result.FromUserName}]]> </ToUserName> <FromUserName> <![CDATA[${result.ToUserName}]]> </FromUserName> <CreateTime>12345678</CreateTime> <MsgType> <![CDATA[text]]> </MsgType> <Content> <![CDATA[${doc.content}]]> </Content> </xml>
   res.send(gfxml)
   //关闭数据库链接
   client.close();
   })

   });
   }

github地址：

https://github.com/echoorx/wx-

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