Go结合Gin导出Mysql数据到Excel表格

1、实现目标

Golang 使用excelize 导出表格到浏览器下载或者保存到本地。
后续导入的话也会写到这里

2、使用的库

go get github.com/xuri/excelize/v2

Git地址：
https://github.com/qax-os/excelize
文档地址：
https://xuri.me/excelize/zh-hans/base/installation.html#install

3、项目目录

go-excel
├─ app
│  ├─ excelize
│  │  └─ excelize.go
│  ├─ model
│  │  └─ sysUser.go
│  └─ service
│     └─ userService.go
├─ common
│  └─ mysql.go
├─ go.mod
├─ go.sum
├─ main.go
└─ setting.json

4、主要代码编写

gin还不会老师们可以看：https://blog.csdn.net/bei_FengBoby/article/details/124847078
读取配置文件是用的viper

4.1、excelize.go(主要工具类)

ExportExcelByStruct 函数 是从网络上直接copy的，研究他这个写法花了好一会儿，所以也写上去了，提供大家学习

import (
"fmt"
"math/rand"
"net/url"
"reflect"
"strconv"
"time"

"github.com/gin-gonic/gin"
"github.com/xuri/excelize/v2"
)

var (
defaultSheetName = "Sheet1" //默认Sheet名称
defaultHeight    = 25.0     //默认行高度
)

type lzExcelExport struct {
file      *excelize.File
sheetName string //可定义默认sheet名称
}

func NewMyExcel() *lzExcelExport {
return &lzExcelExport{file: createFile(), sheetName: defaultSheetName}
}

//导出基本的表格
func (l *lzExcelExport) ExportToPath(params []map[string]string, data []map[string]interface{}, path string) (string, error) {
l.export(params, data)
name := createFileName()
filePath := path + "/" + name
err := l.file.SaveAs(filePath)
return filePath, err
}

//导出到浏览器。此处使用的gin框架 其他框架可自行修改ctx
func (l *lzExcelExport) ExportToWeb(params []map[string]string, data []map[string]interface{}, c *gin.Context) {
l.export(params, data)
buffer, _ := l.file.WriteToBuffer()
//设置文件类型
c.Header("Content-Type", "application/vnd.ms-excel;charset=utf8")
//设置文件名称
c.Header("Content-Disposition", "attachment; filename="+url.QueryEscape(createFileName()))
_, _ = c.Writer.Write(buffer.Bytes())
}

//设置首行
func (l *lzExcelExport) writeTop(params []map[string]string) {
topStyle, _ := l.file.NewStyle(`{"font":{"bold":true},"alignment":{"horizontal":"center","vertical":"center"}}`)
var word = 'A'
//首行写入
for _, conf := range params {
title := conf["title"]
width, _ := strconv.ParseFloat(conf["width"], 64)
line := fmt.Sprintf("％c1", word)
//设置标题
_ = l.file.SetCellValue(l.sheetName, line, title)
//列宽
_ = l.file.SetColWidth(l.sheetName, fmt.Sprintf("％c", word), fmt.Sprintf("％c", word), width)
//设置样式
_ = l.file.SetCellStyle(l.sheetName, line, line, topStyle)
word++
}
}

//写入数据
func (l *lzExcelExport) writeData(params []map[string]string, data []map[string]interface{}) {
lineStyle, _ := l.file.NewStyle(`{"alignment":{"horizontal":"center","vertical":"center"}}`)
//数据写入
var j = 2 //数据开始行数
for i, val := range data {
//设置行高
_ = l.file.SetRowHeight(l.sheetName, i+1, defaultHeight)
//逐列写入
var word = 'A'
for _, conf := range params {
valKey := conf["key"]
line := fmt.Sprintf("％c％v", word, j)
isNum := conf["is_num"]

//设置值
if isNum != "0" {
valNum := fmt.Sprintf("'％v", val[valKey])
_ = l.file.SetCellValue(l.sheetName, line, valNum)
} else {
_ = l.file.SetCellValue(l.sheetName, line, val[valKey])
}

//设置样式
_ = l.file.SetCellStyle(l.sheetName, line, line, lineStyle)
word++
}
j++
}
//设置行高 尾行
_ = l.file.SetRowHeight(l.sheetName, len(data)+1, defaultHeight)
}

func (l *lzExcelExport) export(params []map[string]string, data []map[string]interface{}) {
l.writeTop(params)
l.writeData(params, data)
}

func createFile() *excelize.File {
f := excelize.NewFile()
// 创建一个默认工作表
sheetName := defaultSheetName
index := f.NewSheet(sheetName)
// 设置工作簿的默认工作表
f.SetActiveSheet(index)
return f
}

func createFileName() string {
name := time.Now().Format("2006-01-02-15-04-05")
rand.Seed(time.Now().UnixNano())
return fmt.Sprintf("excle-％v-％v.xlsx", name, rand.Int63n(time.Now().Unix()))
}

//excel导出(数据源为Struct) []interface{}
func (l *lzExcelExport) ExportExcelByStruct(titleList []string, data []interface{}, fileName string, sheetName string, c *gin.Context) error {
l.file.SetSheetName("Sheet1", sheetName)
header := make([]string, 0)
for _, v := range titleList {
header = append(header, v)
}
rowStyleID, _ := l.file.NewStyle(`{"font":{"color":"#666666","size":13,"family":"arial"},"alignment":{"vertical":"center","horizontal":"center"}}`)
_ = l.file.SetSheetRow(sheetName, "A1", &header)
_ = l.file.SetRowHeight("Sheet1", 1, 30)
length := len(titleList)
headStyle := Letter(length)
var lastRow string
var widthRow string
for k, v := range headStyle {

if k == length-1 {

lastRow = fmt.Sprintf("％s1", v)
widthRow = v
}
}
if err := l.file.SetColWidth(sheetName, "A", widthRow, 30); err != nil {
fmt.Print("错误--", err.Error())
}
rowNum := 1
for _, v := range data {

t := reflect.TypeOf(v)
fmt.Print("--ttt--", t.NumField())
value := reflect.ValueOf(v)
row := make([]interface {
}, 0)
for l := 0; l < t.NumField(); l++ {

val := value.Field(l).Interface()
row = append(row, val)
}
rowNum++
err := l.file.SetSheetRow(sheetName, "A"+strconv.Itoa(rowNum), &row)
_ = l.file.SetCellStyle(sheetName, fmt.Sprintf("A％d", rowNum), fmt.Sprintf("％s", lastRow), rowStyleID)
if err != nil {
return err
}
}
disposition := fmt.Sprintf("attachment; filename=％s.xlsx", url.QueryEscape(fileName))
c.Writer.Header().Set("Content-Type", "application/octet-stream")
c.Writer.Header().Set("Content-Disposition", disposition)
c.Writer.Header().Set("Content-Transfer-Encoding", "binary")
c.Writer.Header().Set("Access-Control-Expose-Headers", "Content-Disposition")
return l.file.Write(c.Writer)
}

// Letter 遍历a-z
func Letter(length int) []string {
var str []string
for i := 0; i < length; i++ {
str = append(str, string(rune('A'+i)))
}
return str
}

4.2、userService.go（接受请求）

其中导出的函数都已经测试是ok的，可以直接用，数据改成自己的就好，
注意的事项里面我也写了，避雷！！

import (
"go-excel/app/excelize"
"go-excel/app/model"
config "go-excel/common"
"github.com/gin-gonic/gin"
)

//获取所有用户数据-excel
func GetAllUserExportToWeb(ctx *gin.Context) {
var users []model.TUser
db := config.GetDB()
db.Find(&users)

//定义首行标题
dataKey := make([]map[string]string, 0)
dataKey = append(dataKey, map[string]string{
"key":    "id",
"title":  "索引",
"width":  "20",
"is_num": "0",
})
dataKey = append(dataKey, map[string]string{
"key":    "username",
"title":  "用户名",
"width":  "20",
"is_num": "0",
})
dataKey = append(dataKey, map[string]string{
"key":    "remark",
"title":  "备注",
"width":  "20",
"is_num": "0",
})

//填充数据
data := make([]map[string]interface{}, 0)
if len(users) > 0 {
for _, v := range users {
data = append(data, map[string]interface{}{
"id":       v.ID,
"username": v.Username,
"remark":   v.Remark,
})
}
}
ex := excelize.NewMyExcel()

// ex.ExportToWeb(dataKey, data, ctx)

//保存到D盘
ex.ExportToPath(dataKey, data, "D:/")
}

//excel 导出
func GetUserExcelByMap(ctx *gin.Context) {
var users []model.TUser
db := config.GetDB()
db.Find(&users)

titles := []string{"ID", "用户名", "备注"}

ex := excelize.NewMyExcel()

var datas []interface{}
for _, v := range users {
//这里最好新建一个struct 和titles一致，不然users里面的多余的字段也会写进去
datas = append(datas, model.TUser{
ID:       v.ID,
Username: v.Username,
Remark:   v.Remark,
})
}
ex.ExportExcelByStruct(titles, datas, "用户数据", "用户", ctx)
}

4.2、测试结果

GetAllUserExportToWeb

GetUserExcelByMap

5、文档代码地址

https://gitee.com/hjx_RuGuoYunZhiDao/strom-huang-go.git &mdash;go-excel目录

来源：https://blog.csdn.net/bei_FengBoby/article/details/126038229