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

<xml>
	<ToUserName>
		<![CDATA[gh_2c0117a22e61]]>
	</ToUserName>
	<FromUserName>
		<![CDATA[oyugi1EtuG4F6pzRKyEDcVWT1ggc]]>
	</FromUserName>
	<CreateTime>1514954008</CreateTime>
	<MsgType>
		<![CDATA[event]]>
	</MsgType>
	<Event>
		<![CDATA[subscribe]]>  //unsubscribe是取消关注
	</Event>
	<EventKey>
		<![CDATA[]]>
	</EventKey>
</xml>

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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