微信小程序开发之多图片上传+服务端接收

<view class='form-s2'>
<view>门店照片(请选择三张)</view>
<view>
<view class="weui-uploader__files" id="uploaderFiles">
<block wx:for="{{files}}" wx:key="*this">
<view class="weui-uploader__file" bindtap="previewImage" id="{{item}}" style='margin-top:11px;'>
<image class="weui-uploader__img" src="{{item}}" mode="aspectFill" />
</view>
</block>
</view>
<view class="weui-uploader__input-box" style='top:11px;'>
<view class="weui-uploader__input" bindtap="chooseImage"></view>
</view>
</view>
</view>

Page({
  /**
   * 页面的初始数据
   */
data:
{
  files: [], //门店图片信息,数组图片保存作为数据源
}，
,
  /**
   * 多图片上传
   */
chooseImage: function(e) {
var that = this;
if (that.data.files.length > 2) {
 resource.notishi("抱歉最多只允许上传三张图片哟~");
 return false;
}

wx.chooseImage({
count: 3, //默认9张，这里设置三张
sizeType: ['original', 'compressed'], // 可以指定是原图还是压缩图，默认二者都有
sourceType: ['album', 'camera'], // 可以指定来源是相册还是相机，默认二者都有
success: function(res) {
wx.showLoading({
title: '上传中,请稍等...',
})
// 返回选定照片的本地文件路径列表，tempFilePath可以作为img标签的src属性显示图片
var tempFilePaths = res.tempFilePaths;
 //多图片上传，tempFilePaths本地图片地址为一个数组，遍历调用服务器图片上传接口即可实现多图保存
for (var i = 0; i < tempFilePaths.length; i++) {
console.log('图片地址名称' + tempFilePaths[i]);
wx.uploadFile({
 url: app.globalData.hostUrl + "/api/PictureUpload/Upload", //此处为实际接口地址
filePath: tempFilePaths[i], //获取图片路径
header: {
'content-type': 'multipart/form-data'
},
 name: 'upload',
success: function(res) {
wx.hideLoading();
let Result = JSON.parse(res.data);
console.log(Result);//接收返回来的服务器图片地址
if (Result.code == 1) {
let picurl = app.globalData.hostUrl + Result.picurl;
console.log(picurl);
 that.setData({
files: that.data.files.concat(picurl)
});
} else {
 resource.notishi("网络异常，请稍后再试");
}
},
fail: function(res) {
wx.hideLoading()
wx.showToast({
title: '上传失败，请重新上传',
icon: 'none',
duration: 2000
})
},
})
}
}
})
},
 //图片预览
previewImage: function(e) {
wx.previewImage({
current: e.currentTarget.id, // 当前显示图片的http链接
urls: this.data.files // 需要预览的图片http链接列表
})},
})

/// <summary>
/// 图片上传保存
/// </summary>
/// <returns></returns>
[HttpPost]
public IHttpActionResult Upload()
{
 try
{
var content = Request.Content;//获取http设置的消息和内容
var tempUploadFiles = "/Images/Wechatimages/";//保存路径
var newFileName = "";
string filePath = "";
string extname = "";
string returnurl = "";
var sp = new MultipartMemoryStreamProvider();
Task.Run(async () => await Request.Content.ReadAsMultipartAsync(sp)).Wait();

foreach (var item in sp.Contents)
{
if (item.Headers.ContentDisposition.FileName != null)
{
var filename = item.Headers.ContentDisposition.FileName.Replace("\"", "");
FileInfo file = new FileInfo(filename);
string fileTypes = "gif,jpg,jpeg,png,bmp";
if (Array.IndexOf(fileTypes.Split(','), file.Extension.Substring(1).ToLower()) == -1)
{
throw new ApplicationException("不支持上传文件类型");
}

//获取后缀
extname = System.IO.Path.GetExtension(filename);//获取文件的拓展名称
newFileName = Guid.NewGuid().ToString().Substring(0, 6) + extname;
string newFilePath = DateTime.Now.ToString("yyyy-MM-dd") + "/";
if (!Directory.Exists(HostingEnvironment.MapPath("/") + tempUploadFiles + newFilePath))
{
Directory.CreateDirectory(HostingEnvironment.MapPath("/") + tempUploadFiles + newFilePath);
}
filePath = Path.Combine(HostingEnvironment.MapPath("/") + tempUploadFiles + newFilePath, newFileName);
 returnurl = Path.Combine(tempUploadFiles + newFilePath, newFileName);//图片相对路径
var ms = item.ReadAsStreamAsync().Result;
using (var br = new BinaryReader(ms))
{
var data = br.ReadBytes((int)ms.Length);
File.WriteAllBytes(filePath, data);//保存图片
}
}
}
return Json(new {code=1,picurl= returnurl,msg="success" }) ;
}
catch (Exception ex)
{
return Json(new { code =0,msg=ex.Message});
}
}