Quick Start: Use Go language functions to implement simple login verification functions

Quick Start: Use Go language functions to implement simple login verification function

In web application development, user login is a very common function. This article will introduce how to use Go language functions to implement a simple login verification function to help you quickly get started with web development in Go language.

We will use the net/http package of the Go language to create an HTTP server and listen to user requests. Use Go language functions and simple logical judgments to implement user login verification functions.

First, create a new Go file named main.go. Import the required packages in the file:

package main

import (
    "fmt"
    "net/http"
)

Next, implement an HTTP router in the main function:

func main() {
    http.HandleFunc("/", loginHandler)
    http.ListenAndServe(":8080", nil)
}

In the above code, we use the http.HandleFunc function To specify a URL path and corresponding processing function, loginHandler is our custom processing function. http.ListenAndServe The function is used to start the HTTP server and listen to port 8080.

Next, let’s implement the login processing function loginHandler:

func loginHandler(w http.ResponseWriter, r *http.Request) {
    // 解析用户请求中的表单数据
    r.ParseForm()

    // 获取用户名和密码
    username := r.Form.Get("username")
    password := r.Form.Get("password")

    // 验证用户名和密码是否正确
    if username == "admin" && password == "admin123" {
        fmt.Fprintln(w, "登录成功")
    } else {
        fmt.Fprintln(w, "用户名或密码错误")
    }
}

In the above code, we first use the r.ParseForm() function to parse Form data from user request. Then, obtain the username and password through the r.Form.Get method and store them in the username and password variables.

Next, we use logical judgment to verify whether the username and password are correct. If the user name is "admin" and the password is "admin123", "Login successful" is output; otherwise, "User name or password is incorrect" is output.

Finally, we use the fmt.Fprintln function to output the result to the ResponseWriter and return it to the user.

Now, our login verification function has been implemented. Next, we can use any tool that supports sending HTTP requests, such as a browser or Postman, etc., to verify that our code is working properly.

Compile and run the code:

go run main.go

Enter the address http://localhost:8080 in the browser, and you will see a simple login page. Enter the correct username and password, click Login, and the page will display "Login successful". If you enter an incorrect username or password, the page will display "Incorrect username or password."

So far, we have successfully implemented a simple login verification function using Go language functions. Through the sample code in this article, I believe you have a preliminary understanding of the functions of the Go language and the use of HTTP servers. I hope this article will help you get started with Go language web development!

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