實現打印級別且帶圖片的Excel 方案

導出二維數據excel，其實很簡單，使用cvs就能夠了。可是若是導出格式複雜帶樣式還帶圖片的怎麼辦？客戶的要求有時就是這麼變態。呵呵。若是使用.net，微軟提供的有庫，使用php好像也有現成的有庫。我大體對這些庫進行了解，均可以實現咱們的需求。惋惜我如今使用的golang沒有那麼庫支持，因此只好裸搞了。

Excel格式分爲兩種，第一種是封閉式，不知道使用啥格式，好比office 2003使用的格式，擴展名爲*.xsl。另外一種是開放式的，使用的是Open XML技術，好比office 2007 之後的版本，好在如今已經2014了，7年過去，大部分人都已經用到office 2012，即便國產的wps也早已經完美支持Open XML 了。 因此不用考慮兼容問題了。

此次個人解決方案就是從Open XML 入手。經過對Open XML學習，解決思路大體可分爲3步驟：

第一步：使用支持Open XML 的軟件，好比 office 2010製做一個咱們想要的Excel，保存擴展名名爲xlsx。

第二步：把xlsx修改擴展名爲 zip,解壓後使用佔位符，修改裏面相應的XML文件，而後壓縮，再把擴展名修改成xlsx。這個壓縮文件咱們可稱爲導出模板。

第三步：使用程序動態解壓，替換佔位符，再壓縮。其中對圖片的處理，是把圖片保存到相應文件夾以及相應XML，千言萬語，不如代碼更加直接，實現代碼以下：

 

func (c Order) Excel(pageIndex int, pageSize int, sortField string, sortOrder string, customId int64, state string, orderTime string) revel.Result {
    sql := "select a.name A,b.name B,e.name C,d.name D,c.name E,a.order_time F,a.money G,a.state H,a.image I,a.width J,a.height K,a.area L,a.unit M,a.amount N,a.price O,f.alias P,a.remarks Q from ad_order a,ad_custom b,ad_product c,ad_stuff d,ad_stuff_cat e,ad_user f where a.product_id=c.id and c.stuff_id=d.id and d.cat_id=e.id and a.custom_id=b.id and a.user_id=f.id and a.del_state='未刪' %s %s %s order by a.id desc"
    sql = fmt.Sprintf(sql, fmt.Sprintf("and a.custom_id=%d", customId), "%s", "%s")
    if state != "" {
        sql = fmt.Sprintf(sql, fmt.Sprintf("and a.state='%s'", state), "%s")
    } else {
        sql = fmt.Sprintf(sql, "", "%s")
    }
    if orderTime != "" {
        sql = fmt.Sprintf(sql, fmt.Sprintf("and a.order_time='%s'", orderTime))
    } else {
        sql = fmt.Sprintf(sql, "")
    }
    orders, err := Orm.Query(sql)
    if err != nil {
        return c.RenderJson(models.Message{State: "failure", Msg: err.Error()})
    }
    rows := make([]Rows, 0)
    col := 17
    for i := 1; i <= len(orders); i++ {
        row := Rows{}
        row.RowId = i + 1
        for k := 0; k < col; k++ {
            row.Columns = append(row.Columns, Columns{R: fmt.Sprintf("%s%d", string(ABC[k]), i+1), V: i*col + k})
        }
        rows = append(rows, row)
    }
    vmlDrawings := make([]VmlDrawing, 0)
    sharedStrings := make([]string, 0)
    sharedStrings = append(sharedStrings, "訂單名稱")
    sharedStrings = append(sharedStrings, "客戶名稱")
    sharedStrings = append(sharedStrings, "產品目錄")
    sharedStrings = append(sharedStrings, "產品材料")
    sharedStrings = append(sharedStrings, "產品名稱")
    sharedStrings = append(sharedStrings, "訂單日期")
    sharedStrings = append(sharedStrings, "金額")
    sharedStrings = append(sharedStrings, "收費狀態")
    sharedStrings = append(sharedStrings, "產品圖片")
    sharedStrings = append(sharedStrings, "寬度(米)")
    sharedStrings = append(sharedStrings, "高度(米)")
    sharedStrings = append(sharedStrings, "面積")
    sharedStrings = append(sharedStrings, "單位")
    sharedStrings = append(sharedStrings, "數量")
    sharedStrings = append(sharedStrings, "單價")
    sharedStrings = append(sharedStrings, "經手人")
    sharedStrings = append(sharedStrings, "備註")
    for i, row := range orders {
        if string(row["I"]) != "" {
            img := string(row["I"])
            vmlDrawing := VmlDrawing{}
            vmlDrawing.Index = i
            vmlDrawing.Id = img[:strings.Index(img, ".")]
            vmlDrawing.Name = fmt.Sprintf("S%s", img)
            vmlDrawing.RowBegin = i + 1
            vmlDrawing.RowEnd = i + 2
            vmlDrawings = append(vmlDrawings, vmlDrawing)
        }
        sharedStrings = append(sharedStrings, string(row["A"])) //訂單名稱
        sharedStrings = append(sharedStrings, string(row["B"])) //客戶名稱
        sharedStrings = append(sharedStrings, string(row["C"])) //產品目錄
        sharedStrings = append(sharedStrings, string(row["D"])) //產品材料
        sharedStrings = append(sharedStrings, string(row["E"])) //產品名稱
        sharedStrings = append(sharedStrings, string(row["F"])) //訂單日期

        f1, _ := strconv.ParseFloat(string(row["G"]), 32)
        sharedStrings = append(sharedStrings, fmt.Sprintf("%.2f", f1)) //金額
        sharedStrings = append(sharedStrings, string(row["H"]))        //收費狀態
        sharedStrings = append(sharedStrings, "")                      //產品圖片

        f2, _ := strconv.ParseFloat(string(row["J"]), 32)
        sharedStrings = append(sharedStrings, fmt.Sprintf("%.2f", f2)) //寬度(米)

        f3, _ := strconv.ParseFloat(string(row["K"]), 32)
        sharedStrings = append(sharedStrings, fmt.Sprintf("%.2f", f3)) //高度(米)

        f4, _ := strconv.ParseFloat(string(row["L"]), 32)
        sharedStrings = append(sharedStrings, fmt.Sprintf("%.4f", f4)) //面積
        sharedStrings = append(sharedStrings, string(row["M"]))        //單位
        sharedStrings = append(sharedStrings, string(row["N"]))        //數量

        f5, _ := strconv.ParseFloat(string(row["O"]), 32)
        sharedStrings = append(sharedStrings, fmt.Sprintf("%.2f", f5)) //單價
        sharedStrings = append(sharedStrings, string(row["P"]))        //經手人
        sharedStrings = append(sharedStrings, string(row["Q"]))        //備註
    }
    basePath := revel.BasePath
    basePathPrefix := fpath.Join(basePath, fpath.FromSlash("app/templates"))

    file, _ := os.Create(fpath.Join(basePathPrefix, fpath.FromSlash(fmt.Sprintf("%s.xlsx", "orders"))))
    w := zip.NewWriter(file)
    defer w.Close()
    r, _ := zip.OpenReader(fpath.Join(basePathPrefix, fpath.FromSlash(fmt.Sprintf("%s.xlsx", "order"))))
    defer r.Close()
    for _, f := range r.File {
        switch f.Name {
        case "xl/worksheets/sheet1.xml":
            buf := new(bytes.Buffer)
            rc, _ := f.Open()
            data, _ := ioutil.ReadAll(rc)
            rc.Close()
            tmpl, _ := template.New("sheet").Parse(string(data))
            tmpl.Execute(buf, rows)
            ff, _ := w.Create(f.Name)
            ff.Write(buf.Bytes())
            break
        case "xl/sharedStrings.xml":
            buf := new(bytes.Buffer)
            rc, _ := f.Open()
            data, _ := ioutil.ReadAll(rc)
            rc.Close()
            tmpl, _ := template.New("sharedStrings").Parse(string(data))
            tmpl.Execute(buf, sharedStrings)
            ff, _ := w.Create(f.Name)
            ff.Write(buf.Bytes())
            break
        case "xl/drawings/_rels/vmlDrawing1.vml.rels":
            buf := new(bytes.Buffer)
            rc, _ := f.Open()
            data, _ := ioutil.ReadAll(rc)
            rc.Close()
            tmpl, _ := template.New("vmlDrawing1.vml").Parse(string(data))
            tmpl.Execute(buf, vmlDrawings)
            ff, _ := w.Create(f.Name)
            ff.Write(buf.Bytes())
            break
        case "xl/drawings/vmlDrawing1.vml":
            buf := new(bytes.Buffer)
            rc, _ := f.Open()
            data, _ := ioutil.ReadAll(rc)
            rc.Close()
            tmpl, _ := template.New("vmlDrawing1").Parse(string(data))
            tmpl.Execute(buf, vmlDrawings)
            ff, _ := w.Create(f.Name)
            ff.Write(buf.Bytes())
            basePath := revel.BasePath
            basePathPrefix := fpath.Join(basePath, fpath.FromSlash("public/upload"))
            for _, v := range vmlDrawings {
                fsmall := fpath.Join(basePathPrefix, fpath.FromSlash(v.Name))
                file, _ := os.Open(fsmall)
                data, _ := ioutil.ReadAll(file)
                ff, _ := w.Create(fmt.Sprintf("xl/media/%s", v.Name))
                ff.Write(data)
            }
            break
        default:
            ff, _ := w.Create(f.Name)
            rc, _ := f.Open()
            data, _ := ioutil.ReadAll(rc)
            ff.Write(data)
            rc.Close()
        }
    }
    return c.RenderFile(file, revel.Attachment)
}

最後吐槽一下，博客園插入code，既然沒有golang。