[转]微信小程序实现图片上传功能

本文转自：http://blog.csdn.net/feter1992/article/details/77877659

前端： 微信开发者工具

后端：.Net

服务器：阿里云

这里介绍微信小程序如何实现上传图片到自己的服务器上

前端代码

[javascript] view plain copy print?

data: {

productInfo: {}

},

//添加Banner

bindChooiceProduct: function () {

var that = this;

wx.chooseImage({

count: 3, //最多可以选择的图片总数

sizeType: ['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) {

// 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;

//启动上传等待中...

wx.showToast({

title: '正在上传...',

icon: 'loading',

mask: true,

duration: 10000

})

var uploadImgCount = 0;

for (var i = 0, h = tempFilePaths.length; i < h; i++) {

wx.uploadFile({

url: util.getClientSetting().domainName + '/home/uploadfilenew',

filePath: tempFilePaths[i],

name: 'uploadfile_ant',

formData: {

'imgIndex': i

},

header: {

"Content-Type": "multipart/form-data"

},

success: function (res) {

uploadImgCount++;

var data = JSON.parse(res.data);

//服务器返回格式: { "Catalog": "testFolder", "FileName": "1.jpg", "Url": "https://test.com/1.jpg" }

var productInfo = that.data.productInfo;

if (productInfo.bannerInfo == null) {

productInfo.bannerInfo = [];

}

productInfo.bannerInfo.push({

"catalog": data.Catalog,

"fileName": data.FileName,

"url": data.Url

});

that.setData({

productInfo: productInfo

});

//如果是最后一张,则隐藏等待中

if (uploadImgCount == tempFilePaths.length) {

wx.hideToast();

}

},

fail: function (res) {

wx.hideToast();

wx.showModal({

title: '错误提示',

content: '上传图片失败',

showCancel: false,

success: function (res) { }

})

}

});

}

}

});

}

data: {
productInfo: {}
},
//添加Banner
bindChooiceProduct: function () {
var that = this;

wx.chooseImage({
count: 3,  //最多可以选择的图片总数
sizeType: ['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) {
// 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;
//启动上传等待中...
wx.showToast({
title: '正在上传...',
icon: 'loading',
mask: true,
duration: 10000
})
var uploadImgCount = 0;
for (var i = 0, h = tempFilePaths.length; i < h; i++) {
wx.uploadFile({
url: util.getClientSetting().domainName + '/home/uploadfilenew',
filePath: tempFilePaths[i],
name: 'uploadfile_ant',
formData: {
'imgIndex': i
},
header: {
"Content-Type": "multipart/form-data"
},
success: function (res) {
uploadImgCount++;
var data = JSON.parse(res.data);
//服务器返回格式: { "Catalog": "testFolder", "FileName": "1.jpg", "Url": "https://test.com/1.jpg" }
var productInfo = that.data.productInfo;
if (productInfo.bannerInfo == null) {
productInfo.bannerInfo = [];
}
productInfo.bannerInfo.push({
"catalog": data.Catalog,
"fileName": data.FileName,
"url": data.Url
});
that.setData({
productInfo: productInfo
});

//如果是最后一张,则隐藏等待中
if (uploadImgCount == tempFilePaths.length) {
wx.hideToast();
}
},
fail: function (res) {
wx.hideToast();
wx.showModal({
title: '错误提示',
content: '上传图片失败',
showCancel: false,
success: function (res) { }
})
}
});
}
}
});
}

后端上传代码(将文件上传到服务器临时文件夹内)

[csharp] view plain copy print?

[HttpPost]

public ContentResult UploadFileNew()

{

UploadFileDTO model = new UploadFileDTO();

HttpPostedFileBase file = Request.Files["uploadfile_ant"];

if (file != null)

{

//公司编号+上传日期文件主目录

model.Catalog = DateTime.Now.ToString("yyyyMMdd");

model.ImgIndex = Convert.ToInt32(Request.Form["imgIndex"]);

//获取文件后缀

string extensionName = System.IO.Path.GetExtension(file.FileName);

//文件名

model.FileName = System.Guid.NewGuid().ToString("N") + extensionName;

//保存文件路径

string filePathName = System.IO.Path.Combine(CommonHelper.GetConfigValue("ImageAbsoluteFolderTemp"), model.Catalog);

if (!System.IO.Directory.Exists(filePathName))

{

System.IO.Directory.CreateDirectory(filePathName);

}

//相对路径

string relativeUrl = CommonHelper.GetConfigValue("ImageRelativeFolderTemp");

file.SaveAs(System.IO.Path.Combine(filePathName, model.FileName));

//获取临时文件相对完整路径

model.Url = System.IO.Path.Combine(relativeUrl, model.Catalog, model.FileName).Replace("\\", "/");

}

return Content(Newtonsoft.Json.JsonConvert.SerializeObject(model));

}

[HttpPost]
public ContentResult UploadFileNew()
{
UploadFileDTO model = new UploadFileDTO();
HttpPostedFileBase file = Request.Files["uploadfile_ant"];
if (file != null)
{
//公司编号+上传日期文件主目录
model.Catalog = DateTime.Now.ToString("yyyyMMdd");
model.ImgIndex = Convert.ToInt32(Request.Form["imgIndex"]);

//获取文件后缀
string extensionName = System.IO.Path.GetExtension(file.FileName);

//文件名
model.FileName = System.Guid.NewGuid().ToString("N") + extensionName;

//保存文件路径
string filePathName = System.IO.Path.Combine(CommonHelper.GetConfigValue("ImageAbsoluteFolderTemp"), model.Catalog);
if (!System.IO.Directory.Exists(filePathName))
{
System.IO.Directory.CreateDirectory(filePathName);
}
//相对路径
string relativeUrl = CommonHelper.GetConfigValue("ImageRelativeFolderTemp");
file.SaveAs(System.IO.Path.Combine(filePathName, model.FileName));

//获取临时文件相对完整路径
model.Url = System.IO.Path.Combine(relativeUrl, model.Catalog, model.FileName).Replace("\\", "/");
}
return Content(Newtonsoft.Json.JsonConvert.SerializeObject(model));
}

[csharp] view plain copy print?

/// <summary>

/// 上传文件 返回数据模型

/// </summary>

public class UploadFileDTO

{

/// <summary>

/// 目录名称

/// </summary>

public string Catalog { set; get; }

/// <summary>

/// 文件名称，包括扩展名

/// </summary>

public string FileName { set; get; }

/// <summary>

/// 浏览路径

/// </summary>

public string Url { set; get; }

/// <summary>

/// 上传的图片编号(提供给前端判断图片是否全部上传完)

/// </summary>

public int ImgIndex { get; set; }

}

/// <summary>
/// 上传文件 返回数据模型
/// </summary>
public class UploadFileDTO
{
/// <summary>
/// 目录名称
/// </summary>
public string Catalog { set; get; }
/// <summary>
/// 文件名称，包括扩展名
/// </summary>
public string FileName { set; get; }
/// <summary>
/// 浏览路径
/// </summary>
public string Url { set; get; }
/// <summary>
/// 上传的图片编号(提供给前端判断图片是否全部上传完)
/// </summary>
public int ImgIndex { get; set; }
}

[csharp] view plain copy print?

#region 获取配置文件Key对应Value值

/// <summary>

/// 获取配置文件Key对应Value值

/// </summary>

/// <param name="key"></param>

/// <returns></returns>

public static string GetConfigValue(string key)

{

return ConfigurationManager.AppSettings[key].ToString();

}

#endregion

#region 获取配置文件Key对应Value值
/// <summary>
/// 获取配置文件Key对应Value值
/// </summary>
/// <param name="key"></param>
/// <returns></returns>
public static string GetConfigValue(string key)
{
return ConfigurationManager.AppSettings[key].ToString();
}
#endregion

设置配置文件上传文件对应的文件夹信息

[html] view plain copy print?

<appSettings>

<!--图片临时文件夹 绝对路径-->

<add key="ImageAbsoluteFolderTemp" value="D:\Images\temp" />

<!--图片正式文件夹 绝对路径-->

<add key="ImageAbsoluteFolderFinal" value="D:\Images\product" />

<!--图片临时文件夹 相对路径-->

<add key="ImageRelativeFolderTemp" value="http://192.168.1.79:9009/temp"/>

<!--图片正式文件夹 相对路径-->

<add key="ImageRelativeFolderFinal" value="http://192.168.1.79:9009/product"/>

</appSettings>

<appSettings>
<!--图片临时文件夹 绝对路径-->
<add key="ImageAbsoluteFolderTemp" value="D:\Images\temp" />
<!--图片正式文件夹 绝对路径-->
<add key="ImageAbsoluteFolderFinal" value="D:\Images\product" />

<!--图片临时文件夹 相对路径-->
<add key="ImageRelativeFolderTemp" value="http://192.168.1.79:9009/temp"/>
<!--图片正式文件夹 相对路径-->
<add key="ImageRelativeFolderFinal" value="http://192.168.1.79:9009/product"/>
</appSettings>

PS：上传到服务器的临时文件夹内，当用户点击保存才把这些文件移动到正式目录下

欢迎加入我的微信小程序技术交流群