How to use Golang to implement WeChat public account development for web applications

With the popularity of mobile devices and the rise of social media, WeChat public accounts have become an effective tool for publicity and promotion for many companies and individuals. Integrating WeChat official accounts in web applications can effectively help us achieve various needs such as business promotion and user services. Using Golang to implement WeChat public account development for web applications can provide us with a more efficient and stable solution.

This article will introduce how to use Golang to write web applications and integrate WeChat public account services.

1. Set up a development environment

First we need to set up a Golang development environment. We can download the Golang installation package suitable for our own operating system on the official website (https://golang.org/) to install.

2. Install the necessary dependencies

In the process of writing web applications using Golang, we need to use some dependent libraries for development. Among them, Gin is currently a popular Web framework, and Go-Wechat is Golang's WeChat development framework. We can install dependencies through the following command:

go get -u github.com/gin-gonic/gin
go get -u github.com/silenceper/wechat/v2

3. Create a Web application

With the following code example, we can create a simple Web application:

package main

import "github.com/gin-gonic/gin"

func main() {
    r := gin.Default()

    r.GET("/", func(c *gin.Context) {
        c.String(200, "Hello World")
    })

    r.Run(":8080")
}

Execute the code to start the web application. Access http://localhost:8080 through the browser and you can see the output "Hello World".

4. Integrate WeChat public account service

4.1. Register WeChat public account

Before starting to integrate WeChat public account service, you need to register a WeChat public account and obtain The AppID and AppSecret of the WeChat official account. You can go to [WeChat public platform official website](https://mp.weixin.qq.com/cgi-bin/registermidpage?action=index) to register.

4.2. Configure WeChat public account information

When we integrate the WeChat public account service, we need to perform relevant configurations in the Go-Wechat library.

package main

import (
    "github.com/gin-gonic/gin"
    "github.com/silenceper/wechat/v2/cache"
    "github.com/silenceper/wechat/v2/config"
    "github.com/silenceper/wechat/v2/officialaccount"
)

func main() {
    r := gin.Default()

    // 配置微信公众号信息
    cfg := &config.Config{
        AppID:     "your app id",
        AppSecret: "your app secret",
        Token:     "your token",
        AESKey:    "your aes key",
        Cache:     cache.NewMemory(),
    }

    // 初始化Wechat实例
    oa := officialaccount.NewOfficialAccount(cfg)

    r.GET("/", func(c *gin.Context) {
        c.String(200, "Welcome to my Wechat Public Platform")
    })

    // 微信公众号接入验证
    r.GET("/wechat", func(c *gin.Context) {
        if err := oa.Server.VerifySignature(c.Writer, c.Request); err != nil {
            c.String(200, "Not a valid request")
            return
        }

        c.String(200, c.Query("echostr"))
    })

    r.Run(":8080")
}

Among them, cfg is the configuration information of the WeChat public account, and you need to fill in your own AppID, AppSecret, Token, AESKey and other information. Cache is a cache instance. We use memory cache here, but you can also use other cache methods such as Redis. oa is a Wechat instance, which can send requests to the WeChat server and obtain responses through the functions it provides.

4.3. Processing WeChat public account events and messages

After obtaining messages or events from users, we need to process them accordingly. This can be achieved through the following code example:

package main

import (
    "github.com/gin-gonic/gin"
    "github.com/silenceper/wechat/v2/cache"
    "github.com/silenceper/wechat/v2/config"
    "github.com/silenceper/wechat/v2/officialaccount"
)

func main() {
    r := gin.Default()

    // 配置微信公众号信息
    cfg := &config.Config{
        AppID:     "your app id",
        AppSecret: "your app secret",
        Token:     "your token",
        AESKey:    "your aes key",
        Cache:     cache.NewMemory(),
    }

    // 初始化Wechat实例
    oa := officialaccount.NewOfficialAccount(cfg)

    r.GET("/", func(c *gin.Context) {
        c.String(200, "Welcome to my Wechat Public Platform")
    })

    // 微信公众号接入验证
    r.GET("/wechat", func(c *gin.Context) {
        if err := oa.Server.VerifySignature(c.Writer, c.Request); err != nil {
            c.String(200, "Not a valid request")
            return
        }

        c.String(200, c.Query("echostr"))
    })

    // 处理微信公众号事件和消息
    r.POST("/wechat", func(c *gin.Context) {
        server := oa.Server
        msg, err := server.ParseRequest(c.Request)
        if err != nil {
            c.String(200, "Parsing request error")
            return
        }

        switch msg.Event {
        case "subscribe":
            resp := server.GetInviteFollowersResp("欢迎关注我的公众号！")
            c.String(200, resp)

        case "text":
            reqMsg := msg.(*request.Text)
            resp := server.GetMaterialTextResp(reqMsg.Content)
            c.String(200, resp)
        }
    })

    r.Run(":8080")
}

In the above code example, we sent a request to the WeChat official account server and responded through the WeChat official account service callback function. When processing requests, we perform different processing operations based on different types of events and messages.

5. Conclusion

Through the introduction of this article, we can learn how to use Golang to implement WeChat public account development for web applications. Among them, we used Gin as the Web framework and Go-Wechat as the WeChat development framework, and introduced how to register WeChat public accounts, configure WeChat public account information, and process WeChat public account events and messages. Through the above steps, we can quickly develop an efficient and stable WeChat public account service.

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