怎样用Golang实现一个简单的REST API 使用Gin框架快速开发

go mod init your_project_name

go get -u github.com/gin-gonic/gin

package main

import (
    "github.com/gin-gonic/gin"
    "net/http"
)

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

    r.GET("/ping", func(c *gin.Context) {
        c.JSON(http.StatusOK, gin.H{
            "message": "pong",
        })
    })

    r.Run(":8080")
}

type User struct {
    ID   string `json:"id"`
    Name string `json:"name"`
}

var users = []User{
    {ID: "1", Name: "Alice"},
    {ID: "2", Name: "Bob"},
}

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

    r.GET("/users", func(c *gin.Context) {
        c.JSON(http.StatusOK, users)
    })

    r.GET("/users/:id", func(c *gin.Context) {
        id := c.Param("id")

        for _, user := range users {
            if user.ID == id {
                c.JSON(http.StatusOK, user)
                return
            }
        }

        c.JSON(http.StatusNotFound, gin.H{"error": "user not found"})
    })

    r.Run(":8080")
}

api := r.Group("/api")
{
    api.GET("/users", func(c *gin.Context) { ... })
    api.GET("/users/:id", func(c *gin.Context) { ... })
}

r.Use(func(c *gin.Context) {
    c.Writer.Header().Set("Access-Control-Allow-Origin", "*")
    c.Next()
})