gin使用

介绍

参考网上的gin用法，做备份用来查询

示例

package main

import (
    "fmt"
    "github.com/gin-gonic/gin"
    "github.com/gin-gonic/gin/binding"
    "gopkg.in/go-playground/validator.v8"
    "net/http"
    "reflect"
    "time"
)

func init() {
    fmt.Println("start")
    //gin日志输出 在实例化之前设置
    //gin.DisableConsoleColor()
    //f, _ := os.Create("gin.log")
    //gin.DefaultWriter = io.MultiWriter(f)
}

type User struct {
    Name string `json:"name" form:"name" binding:"required"`
    Age  uint8  `json:"age" form:"age" binding:"required,ageValidator"`
}

//校验
func AgeValidator(v *validator.Validate, topStruct reflect.Value,
    currentStruct reflect.Value, field reflect.Value,
    fieldtype reflect.Type, fieldKind reflect.Kind, param string) bool {
    if age, ok := field.Interface().(uint8); ok {
        if age > 150 {
            return false
        }
    }
    return true
}

func Logger() gin.HandlerFunc {
    return func(context *gin.Context) {
        t := time.Now()
        context.Next()
        total := time.Since(t)
        fmt.Println("time:", total)
    }
}

func main() {
    router := gin.Default()
    router.LoadHTMLGlob("static/*")
    if v, ok := binding.Validator.Engine().(*validator.Validate); ok {
        v.RegisterValidation("ageValidator", AgeValidator)
    }
    router.Use(func(context *gin.Context) {
        fmt.Println("url=", context.Request.URL.Path)
        context.Next()
    })
    router.Use(Logger())
    router.GET("/test", func(context *gin.Context) {
        context.String(http.StatusOK, "hello test")
    })
    router.GET("/", func(context *gin.Context) {
        //静态页面
        context.HTML(http.StatusOK, "index.html", nil)
    })
    router.GET("/param/:name", func(context *gin.Context) {
        //地址获取值
        name := context.Param("name")
        context.String(http.StatusOK, "name=%s", name)
    })
    router.GET("/params/:name/*action", func(context *gin.Context) {
        name := context.Param("name")
        //任意可以替代action
        action := context.Param("action")
        context.String(http.StatusOK, "name=%s,action=%s", name, action)
    })
    router.GET("/getValue", func(context *gin.Context) {
        //常见的url?name=123&age=1
        name := context.DefaultQuery("name", "")
        age := context.Query("age")
        context.String(http.StatusOK, "name=%s,age=%s", name, age)
    })
    router.POST("/form_post", func(context *gin.Context) {
        //一般的post
        name := context.DefaultPostForm("name", "")
        age := context.PostForm("age")
        context.String(http.StatusOK, "name=%s,age=%s", name, age)
    })
    router.POST("/upload_file", func(context *gin.Context) {
        //上传文件
        file, err := context.FormFile("file")
        if err != nil {
            context.String(http.StatusBadRequest, "bad request")
        }
        fileName := file.Filename
        fmt.Println("filename=", fileName)
        if err := context.SaveUploadedFile(file, fileName); err != nil {
            context.String(http.StatusBadRequest, "upload file fail")
        }
        context.String(http.StatusOK, "upload file success")
    })
    v1 := router.Group("/v1")
    v1.GET("/test1", func(context *gin.Context) {
        context.String(http.StatusOK, "test1")
    })
    v1.GET("/test2", func(context *gin.Context) {
        context.String(http.StatusOK, "test2")
    })
    router.POST("/user_json", func(context *gin.Context) {
        var user User
        if context.BindJSON(&user) == nil {
            context.String(http.StatusOK, "name=%s,age=%d", user.Name, user.Age)
        }
    })

    router.POST("/user_form", func(context *gin.Context) {
        var user User
        if error := context.Bind(&user); error == nil {
            context.String(http.StatusOK, "name=%s,age=%d", user.Name, user.Age)
        } else {
            context.String(http.StatusOK, error.Error())
        }
    })
    router.GET("/user_get", func(context *gin.Context) {
        var user User
        if error := context.ShouldBindQuery(&user); error == nil {
            context.String(http.StatusOK, "name=%s,age=%d", user.Name, user.Age)
        } else {
            context.String(http.StatusOK, error.Error())
        }
    })
    router.GET("/redirect/baidu", func(context *gin.Context) {
        //301跳转
        context.Redirect(http.StatusMovedPermanently, "http://www.baidu.com")
    })
    router.GET("/go", func(context *gin.Context) {
        //go 值拷贝
        c := context.Copy()
        go func() {
            time.Sleep(5 * time.Second)
            fmt.Println(c.Request.URL.Path)
        }()
    })

    router.Run(":8100")
}