导出二维数据excel，其实很简单，使用cvs就可以了。但是如果导出格式复杂带样式还带图片的怎么办？客户的要求有时就是这么变态。呵呵。如果使用.net，微软提供的有库，使用php好像也有现成的有库。我大致对这些库进行了解，都可以实现我们的需求。可惜我现在使用的golang没有那么库支持，所以只好裸搞了。
Excel格式分为两种，第一种是封闭式，不知道使用啥格式，比如office 2003使用的格式，扩展名为*.xsl。另一种是开放式的，使用的是Open XML技术，比如office 2007 以后的版本，好在现在已经2014了，7年过去，大部分人都已经用到office 2012，即使国产的wps也早已经完美支持Open XML 了。 所以不用考虑兼容问题了。
这次我的解决方案就是从Open XML 入手。通过对Open XML学习，解决思路大致可分为3步骤：
第一步：使用支持Open XML 的软件，比如 office 2010制作一个我们想要的Excel，保存扩展名名为xlsx。
第二步：把xlsx修改扩展名为 zip,解压后使用占位符，修改里面相应的XML文件，然后压缩，再把扩展名修改为xlsx。这个压缩文件我们可称为导出模板。
第三步：使用程序动态解压，替换占位符，再压缩。其中对图片的处理，是把图片保存到相应文件夹以及相应XML，千言万语，不如代码更加直接，实现代码如下：
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='未删' %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, "订单名称")
sharedStrings = append(sharedStrings, "客户名称")
sharedStrings = append(sharedStrings, "产品目录")
sharedStrings = append(sharedStrings, "产品材料")
sharedStrings = append(sharedStrings, "产品名称")
sharedStrings = append(sharedStrings, "订单日期")
sharedStrings = append(sharedStrings, "金额")
sharedStrings = append(sharedStrings, "收费状态")
sharedStrings = append(sharedStrings, "产品图片")
sharedStrings = append(sharedStrings, "宽度(米)")
sharedStrings = append(sharedStrings, "高度(米)")
sharedStrings = append(sharedStrings, "面积")
sharedStrings = append(sharedStrings, "单位")
sharedStrings = append(sharedStrings, "数量")
sharedStrings = append(sharedStrings, "单价")
sharedStrings = append(sharedStrings, "经手人")
sharedStrings = append(sharedStrings, "备注")
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"])) //订单名称
sharedStrings = append(sharedStrings, string(row["B"])) //客户名称
sharedStrings = append(sharedStrings, string(row["C"])) //产品目录
sharedStrings = append(sharedStrings, string(row["D"])) //产品材料
sharedStrings = append(sharedStrings, string(row["E"])) //产品名称
sharedStrings = append(sharedStrings, string(row["F"])) //订单日期
f1, _ := strconv.ParseFloat(string(row["G"]), 32)
sharedStrings = append(sharedStrings, fmt.Sprintf("%.2f", f1)) //金额
sharedStrings = append(sharedStrings, string(row["H"])) //收费状态
sharedStrings = append(sharedStrings, "") //产品图片
f2, _ := strconv.ParseFloat(string(row["J"]), 32)
sharedStrings = append(sharedStrings, fmt.Sprintf("%.2f", f2)) //宽度(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)) //面积
sharedStrings = append(sharedStrings, string(row["M"])) //单位
sharedStrings = append(sharedStrings, string(row["N"])) //数量
f5, _ := strconv.ParseFloat(string(row["O"]), 32)
sharedStrings = append(sharedStrings, fmt.Sprintf("%.2f", f5)) //单价
sharedStrings = append(sharedStrings, string(row["P"])) //经手人
sharedStrings = append(sharedStrings, string(row["Q"])) //备注
}
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)
}
最后吐槽一下，博客园插入code，既然没有golang。