AJAX 上传图片 Kevin

引用jquery Form 插件，地址：http://jquery.malsup.com/form/

<script type="text/javascript">
    $(function () {
        $("#btn_show").bind("click", function () {
            $("#form_upload").show();
            var options = {
                success: function (responseText, statusText, xhr, $form) {
                    var picPath = responseText.message;
                    if (picPath == "") {
                        alert(responseText.message);
                    }
                    else {
                        $("#form_upload").hide();
                        alert(unescape(responseText.message.replace(/\\/g, "%")));
                        //                        $("#result").attr("src", picPath).show();
                    }
                },
                error: function (XMLHttpRequest, textStatus, errorThrown) {
                    console.log(textStatus);
                    console.log(errorThrown);
                }
            };

            $("#form_upload").ajaxForm(options);
        });
    });
</script>

　　

<input type="button" id="btn_show" value="上传图片" /><br />
<form id="form_upload" style="padding:20px;display:none" action="AddPic" method="post" enctype="multipart/form-data">
<input name="upImg" style="350px; height:25px;" size="38" type="file" />
<input type="submit" value="上传"/>
</form>

后台C#代码：

  [HttpPost]
        public JsonResult AddPic(HttpPostedFileBase upImg)
        {
            string fileName = Path.GetFileName(upImg.FileName);
            string filePhysicalPath = Server.MapPath("~/Upload/"+fileName);

            string test = "\u56fe\u7247\u4ea0\u4f20\u6210\u529f";

            string name = "", message = "";
            byte[] bytes  = new byte[]{};
            try
            {
                upImg.SaveAs(filePhysicalPath);
                name = Path.GetFileName(fileName);
                bytes = Encoding.Unicode.GetBytes("图片添加成功");
                for (int i = 0; i < bytes.Length; i+=2)
                {
                    message += "\\u" + bytes[i+1].ToString("x").PadLeft(2,'0')+bytes[i].ToString("x").PadRight(2,'0');
                }

            }
            catch (Exception ex)
            {
                message = ex.Message;
            }

            return  Json(new {
                name=name,
                message = message
            });
        }

　　

后台把中文转换成Unicode代码，传输后JS脚本将Unicode再转换成中文，最终通过弹框显示到浏览器中。