Golang实现图片上传功能的示例代码

 <div class="col-5 f-l text text-r">背景图(必须):</div>
  <div class="img-box">
    <label>
      <span class="copy-btn Hui-iconfont"></span>
      <input type="file" class="up-file">
    </label>
  </div>
  <div class="img-file col-offset-5">
  </div>

//读取图片
function loadImg(){
    //获取文件
    var file = $(".up-file")[0].files[0];
    //创建读取文件的对象
    var reader = new FileReader();
    //创建文件读取相关的变量
    var imgFile;
    //为文件读取成功设置事件
    reader.onload=function(e) {
        var e=window.event||e;
        imgFile = e.target.result;
        console.log(imgFile);
        $(".img-file").css({'background':"url("+imgFile+")"});
        isimg();
    };
 
    //正式读取文件
    reader.readAsDataURL(file);
 
}

//是否有图片验证
function isimg(){
    var img= $(".img-file").css('background-image');
 
    if(img.indexOf("data:image")==-1&&img.indexOf(".jpg")==-1){
        $(".mess").html("请添加背景图片").css("opacity",1);
        return false;
    }
    else{
        $(".mess").css("opacity",0).html("");
        return true;
    }
}

function addData(){
    var url=$(".img-file").css("background-image");
    var data1=[{"name":"url","value":url}];
    $.ajax({
        url:"/commmethod/method/uploadimg",
        data:data1,
        type:"post",
        ContentType:"application/json",
        success:function(resp){
         ......
        }
    });
}

func (this *CommMethodController) UploadImg() {
    fileurl := this.GetString("url")
    DataArr := strings.Split(fileurl, ",")
  //去除包装，获取到base64编码
    imgBase64 := DataArr[1][:len(DataArr[1])-2]
  //base64转码
    imgs, err := base64.StdEncoding.DecodeString(imgBase64)
    if err != nil {
        beego.Error("base64 decode error:", err)
    }
    timenow := time.Now().Unix()
    file, err := os.OpenFile("./static/img/"+strconv.FormatInt(timenow, 10)+".jpg", os.O_CREATE|os.O_WRONLY, 0644)
    if err != nil {
        beego.Debug("create file error:", err)
    }
    w := bufio.NewWriter(file) //创建新的 Writer 对象
    _, err3 := w.WriteString(string(imgs))
    if err3 != nil {
        beego.Error("write error:", err3)
    }
    w.Flush()
    defer file.Close()
    imgname := strconv.FormatInt(timenow, 10) + ".jpg"
    t := struct {
        ImageName string `json:"imagename"`
    }{imgname}
    this.Data["json"] = t
    this.ServeJSON()
}
 

func checkFileIsExist(filename string) bool {
    var exist = true
    if _, err := os.Stat(filename); os.IsNotExist(err) {
        exist = false
    }
    return exist
}