前端代码
<!DOCTYPE html>
<html lang="zh-cn">
<head>
<meta charset="UTF-8">
<title>上传头像</title>
<link href="https://cdn.bootcss.com/cropper/3.1.3/cropper.min.css" rel="stylesheet">
<link href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
<style type="text/css">
body{
text-align: center;
}
#user-photo {
300px;
height:300px;
margin-top: 10px;
}
#photo {
max-100%;
max-height:350px;
}
.img-preview-box {
text-align: center;
}
.img-preview-box > div {
display: inline-block;;
margin-right: 10px;
}
.img-preview {
overflow: hidden;
}
.img-preview-box .img-preview-lg {
150px;
height: 150px;
}
.img-preview-box .img-preview-md {
100px;
height: 100px;
}
.img-preview-box .img-preview-sm {
50px;
height: 50px;
border-radius: 50%;
}
</style>
</head>
<body>
<button class="btn btn-primary" data-target="#changeModal" data-toggle="modal">打开</button><br/>
<div class="user-photo-box">
<img id="user-photo" src="">
</div>
</div>
<div class="modal fade" id="changeModal" tabindex="-1" role="dialog" aria-hidden="true">
<div class="modal-dialog">
<div class="modal-content">
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal" aria-hidden="true">×</button>
<h4 class="modal-title text-primary">
<i class="fa fa-pencil"></i>
更换头像
</h4>
</div>
<div class="modal-body">
<p class="tip-info text-center">
未选择图片
</p>
<div class="img-container hidden">
<img src="" alt="" id="photo">
</div>
<div class="img-preview-box hidden">
<hr>
<span>150*150:</span>
<div class="img-preview img-preview-lg">
</div>
<span>100*100:</span>
<div class="img-preview img-preview-md">
</div>
<span>30*30:</span>
<div class="img-preview img-preview-sm">
</div>
</div>
</div>
<div class="modal-footer">
<label class="btn btn-danger pull-left" for="photoInput">
<input type="file" class="sr-only" id="photoInput" accept="image/*">
<span>打开图片</span>
</label>
<button class="btn btn-primary disabled" disabled="true" onclick="sendPhoto();">提交</button>
<button class="btn btn-close" aria-hidden="true" data-dismiss="modal">取消</button>
</div>
</div>
</div>
</div>
<script src="https://cdn.bootcss.com/jquery/3.2.1/jquery.min.js"></script>
<script src="https://cdn.bootcss.com/cropper/3.1.3/cropper.min.js"></script>
<script src="https://cdn.bootcss.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<script type="text/javascript">
var initCropperInModal = function(img, input, modal){
var $image = img;
var $inputImage = input;
var $modal = modal;
var options = {
aspectRatio: 1, // 纵横比
viewMode: 2,
preview: '.img-preview' // 预览图的class名
};
// 模态框隐藏后需要保存的数据对象
var saveData = {};
var URL = window.URL || window.webkitURL;
var blobURL;
$modal.on('show.bs.modal',function () {
// 如果打开模态框时没有选择文件就点击“打开图片”按钮
if(!$inputImage.val()){
$inputImage.click();
}
}).on('shown.bs.modal', function () {
// 重新创建
$image.cropper( $.extend(options, {
ready: function () {
// 当剪切界面就绪后，恢复数据
if(saveData.canvasData){
$image.cropper('setCanvasData', saveData.canvasData);
$image.cropper('setCropBoxData', saveData.cropBoxData);
}
}
}));
}).on('hidden.bs.modal', function () {
// 保存相关数据
saveData.cropBoxData = $image.cropper('getCropBoxData');
saveData.canvasData = $image.cropper('getCanvasData');
// 销毁并将图片保存在img标签
$image.cropper('destroy').attr('src',blobURL);
});
if (URL) {
$inputImage.change(function() {
var files = this.files;
var file;
if (!$image.data('cropper')) {
return;
}
if (files && files.length) {
file = files[0];
if (/^image/w+$/.test(file.type)) {
if(blobURL) {
URL.revokeObjectURL(blobURL);
}
blobURL = URL.createObjectURL(file);
// 重置cropper，将图像替换
$image.cropper('reset').cropper('replace', blobURL);
// 选择文件后，显示和隐藏相关内容
$('.img-container').removeClass('hidden');
$('.img-preview-box').removeClass('hidden');
$('#changeModal .disabled').removeAttr('disabled').removeClass('disabled');
$('#changeModal .tip-info').addClass('hidden');
} else {
window.alert('请选择一个图像文件！');
}
}
});
} else {
$inputImage.prop('disabled', true).addClass('disabled');
}
}
var sendPhoto = function(){
$('#photo').cropper('getCroppedCanvas',{
300,
height:300
}).toBlob(function(blob){
// 转化为blob后更改src属性，隐藏模态框
$('#user-photo').attr('src',URL.createObjectURL(blob));
$('#changeModal').modal('hide');
//向服务器发送请
var useridx = $('#useridx').val();
// 转化为blob后更改src属性，隐藏模态框
$('#user-photo').attr('src',URL.createObjectURL(blob));
$('#changeModal').modal('hide');
var cas = $('#photo').cropper('getCroppedCanvas');
var base64url = cas.toDataURL('image/jpeg'); ////将图片转换成base64url 传递，后台解析保存
if (useridx != "") {
$.post("请求路径", { file: base64url }, function (res) {
if (res == "OK") {
lalert('上传成功');
} else {
alert('上传失败');
}
})
} else {
alert('主播IDX不能为空');
}
});
}
$(function(){
initCropperInModal($('#photo'),$('#photoInput'),$('#changeModal'));
});
</script>
</body>
</html>
后台代码 MVC的写法
///控制器
[HttpPost]
public ActionResult UploadImg(string file)
{
saveFilePath = "E:\新建文件夹\"+DateTime.Now.GetHashCode()+ ".png"; ///保存本地
////这里就是将前端base64url，截取出来
string[] img_array = file.Split(',');
byte[] arr = Convert.FromBase64String(img_array[1]);
using (MemoryStream ms = new MemoryStream(arr))
{
Bitmap bmp = new Bitmap(ms);
if (img_array[0].ToLower() == "data:image/jpeg;base64")
{
bmp.Save(saveFilePath); ///最终保存路径
}
}
}