Go语言使用Gin处理路由参数和查询参数

GET /users/123

GET /search?keyword=gin&page=2

package main

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

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

    // 路由参数示例
    r.GET("/users/:id", func(c *gin.Context) {
        id := c.Param("id")
        c.JSON(http.StatusOK, gin.H{
            "user_id": id,
        })
    })

    // 查询参数示例
    r.GET("/search", func(c *gin.Context) {
        keyword := c.Query("keyword")           // 没有默认值
        page := c.DefaultQuery("page", "1")     // 默认值为 1
        c.JSON(http.StatusOK, gin.H{
            "keyword": keyword,
            "page":    page,
        })
    })

    // 组合使用
    r.GET("/articles/:category", func(c *gin.Context) {
        category := c.Param("category")
        page := c.DefaultQuery("page", "1")
        c.JSON(http.StatusOK, gin.H{
            "category": category,
            "page":     page,
        })
    })

    r.Run(":8080")
}

go run main.go

curl http://localhost:8080/users/42

{"user_id":"42"}

curl "http://localhost:8080/search?keyword=gin&page=2"

{"keyword":"gin","page":"2"}

curl "http://localhost:8080/articles/golang?page=3"

{"category":"golang","page":"3"}

pageNum, err := strconv.Atoi(c.DefaultQuery("page", "1"))