42 Gin仿小米商城项目 轮播图的增删改查

controllers->admin->focus.go

package admin

import (
	"fmt"
	"ginshop11/models"
	"net/http"

	"github.com/gin-gonic/gin"
)

type FocusController struct {
	BaseController
}

func (con FocusController) Index(c *gin.Context) {
	focusList := []models.Focus{}
	models.DB.Find(&focusList)
	c.HTML(http.StatusOK, "admin/focus/index.html", gin.H{
		"focusList": focusList,
	})

}
func (con FocusController) Add(c *gin.Context) {
	c.HTML(http.StatusOK, "admin/focus/add.html", gin.H{})
}
func (con FocusController) DoAdd(c *gin.Context) {

	title := c.PostForm("title")
	focusType, err1 := models.Int(c.PostForm("focus_type"))
	link := c.PostForm("link")
	sort, err2 := models.Int(c.PostForm("sort"))
	status, err3 := models.Int(c.PostForm("status"))

	if err1 != nil || err3 != nil {
		con.Error(c, "非法请求", "/admin/focus/add")
	}
	if err2 != nil {
		con.Error(c, "请输入正确的排序值", "/admin/focus/add")
	}
	//上传文件
	focusImgSrc, err4 := models.UploadImg(c, "focus_img")
	if err4 != nil {
		fmt.Println(err4)
	}

	focus := models.Focus{
		Title:     title,
		FocusType: focusType,
		FocusImg:  focusImgSrc,
		Link:      link,
		Sort:      sort,
		Status:    status,
		AddTime:   int(models.GetUnix()),
	}
	err5 := models.DB.Create(&focus).Error
	if err5 != nil {
		con.Error(c, "增加轮播图失败", "/admin/focus/add")
	} else {
		con.Success(c, "增加轮播图成功", "/admin/focus")
	}

}

func (con FocusController) Edit(c *gin.Context) {
	id, err1 := models.Int(c.Query("id"))
	if err1 != nil {
		con.Error(c, "传入参数错误", "/admin/focus")
		return
	}
	focus := models.Focus{Id: id}
	models.DB.Find(&focus)
	c.HTML(http.StatusOK, "admin/focus/edit.html", gin.H{
		"focus": focus,
	})
}
func (con FocusController) DoEdit(c *gin.Context) {
	id, err1 := models.Int(c.PostForm("id"))
	title := c.PostForm("title")
	focusType, err2 := models.Int(c.PostForm("focus_type"))
	link := c.PostForm("link")
	sort, err3 := models.Int(c.PostForm("sort"))
	status, err4 := models.Int(c.PostForm("status"))

	if err1 != nil || err2 != nil || err4 != nil {
		con.Error(c, "非法请求", "/admin/focus")
	}
	if err3 != nil {
		con.Error(c, "请输入正确的排序值", "/admin/focus/edit?id="+models.String(id))
	}
	//上传文件
	focusImg, _ := models.UploadImg(c, "focus_img")

	focus := models.Focus{Id: id}
	models.DB.Find(&focus)
	focus.Title = title
	focus.FocusType = focusType
	focus.Link = link
	focus.Sort = sort
	focus.Status = status
	if focusImg != "" {
		focus.FocusImg = focusImg
	}
	err5 := models.DB.Save(&focus).Error
	if err5 != nil {
		con.Error(c, "修改数据失败请重新尝试", "/admin/focus/edit?id="+models.String(id))
	} else {
		con.Success(c, "增加轮播图成功", "/admin/focus")
	}
}

func (con FocusController) Delete(c *gin.Context) {
	id, err := models.Int(c.Query("id"))
	if err != nil {
		con.Error(c, "传入数据错误", "/admin/focus")
	} else {
		focus := models.Focus{Id: id}
		models.DB.Delete(&focus)
		//根据自己的需要 要不要删除图片
		// os.Remove("static/upload/20210915/1631694117.jpg")
		con.Success(c, "删除数据成功", "/admin/focus")
	}
}

　　models->tools.go

package models

import (
	"crypto/md5"
	"errors"
	"fmt"
	"io"
	"os"
	"path"
	"strconv"
	"time"

	"github.com/gin-gonic/gin"
)

//时间戳转换成日期
func UnixToTime(timestamp int) string {
	t := time.Unix(int64(timestamp), 0)
	return t.Format("2006-01-02 15:04:05")
}

//日期转换成时间戳 2020-05-02 15:04:05
func DateToUnix(str string) int64 {
	template := "2006-01-02 15:04:05"
	t, err := time.ParseInLocation(template, str, time.Local)
	if err != nil {
		return 0
	}
	return t.Unix()
}

//获取时间戳
func GetUnix() int64 {
	return time.Now().Unix()
}

//获取当前的日期
func GetDate() string {
	template := "2006-01-02 15:04:05"
	return time.Now().Format(template)
}

//获取年月日
func GetDay() string {
	template := "20060102"
	return time.Now().Format(template)
}

//md5加密
func Md5(str string) string {
	h := md5.New()
	io.WriteString(h, str)
	return fmt.Sprintf("%x", h.Sum(nil))
}

//表示把string转换成int
func Int(str string) (int, error) {
	n, err := strconv.Atoi(str)
	return n, err
}

//表示把int转换成string
func String(n int) string {
	str := strconv.Itoa(n)
	return str
}

//上传图片
func UploadImg(c *gin.Context, picName string) (string, error) {
	// 1、获取上传的文件
	file, err := c.FormFile(picName)
	if err != nil {
		return "", err
	}

	// 2、获取后缀名 判断类型是否正确  .jpg .png .gif .jpeg
	extName := path.Ext(file.Filename)
	allowExtMap := map[string]bool{
		".jpg":  true,
		".png":  true,
		".gif":  true,
		".jpeg": true,
	}

	if _, ok := allowExtMap[extName]; !ok {
		return "", errors.New("文件后缀名不合法")
	}

	// 3、创建图片保存目录  static/upload/20210624

	day := GetDay()
	dir := "./static/upload/" + day

	err1 := os.MkdirAll(dir, 0666)
	if err1 != nil {
		fmt.Println(err1)
		return "", err1
	}

	// 4、生成文件名称和文件保存的目录   111111111111.jpeg
	fileName := strconv.FormatInt(GetUnix(), 10) + extName

	// 5、执行上传
	dst := path.Join(dir, fileName)
	c.SaveUploadedFile(file, dst)
	return dst, nil

}