Golang gin传递默认值

package main

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

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

    r.GET("/user/:name", func(c *gin.Context) {
        name := c.Param("name")
        if name == "" {
            name = "Guest" // 设置默认值
        }
        c.JSON(http.StatusOK, gin.H{
            "name": name,
        })
    })

    r.Run(":8080")
}

package main

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

type User struct {
    Name  string `json:"name" binding:"omitempty"`
    Age   int    `json:"age" binding:"omitempty"`
    Email string `json:"email" binding:"omitempty"`
}

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

    r.POST("/user", func(c *gin.Context) {
        var user User
        if err := c.ShouldBindJSON(&user); err != nil {
            c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
            return
        }

        // 设置默认值
        if user.Name == "" {
            user.Name = "Guest"
        }
        if user.Age == 0 {
            user.Age = 18
        }
        if user.Email == "" {
            user.Email = "guest@example.com"
        }

        c.JSON(http.StatusOK, gin.H{
            "user": user,
        })
    })

    r.Run(":8080")
}

if user.Name == "" {
    user.Name = "Guest"
}
if user.Age == 0 {
    user.Age = 18
}
if user.Email == "" {
    user.Email = "guest@example.com"
}