Ajax+Python flask实现上传文件功能

时间:2023-12-28 13:16:08

HTML:

<div  >
<input type="file" name="FileUpload" id="FileUpload">
<a class="layui-btn layui-btn-mini" id="btn_uploadimg">上传图片</a>
</div>

Ajax实现:

<script type="text/jscript">

       $(function () {
$("#btn_uploadimg").click(function () {
var fileObj = document.getElementById("FileUpload").files[0]; // js 获取文件对象
if (typeof (fileObj) == "undefined" || fileObj.size <= 0) {
alert("请选择图片");
return;
}
var formFile = new FormData();
formFile.append("action", "UploadVMKImagePath");
formFile.append("file", fileObj); //加入文件对象 //第一种 XMLHttpRequest 对象
//var xhr = new XMLHttpRequest();
//xhr.open("post", "/Admin/Ajax/VMKHandler.ashx", true);
//xhr.onload = function () {
// alert("上传完成!");
//};
//xhr.send(formFile); //第二种 ajax 提交 var data = formFile;
$.ajax({
url: "/upload/",
data: data,
type: "Post",
dataType: "json",
cache: false,//上传文件无需缓存
processData: false,//用于对data参数进行序列化处理 这里必须false
contentType: false, //必须
success: function (result) {
alert("上传完成!");
},
})
})
}) </script>

后台flask:

from flask import Flask,render_template,request,redirect,url_for
from werkzeug.utils import secure_filename
import os
from flask import send_from_directory
from werkzeug import SharedDataMiddleware UPLOAD_FOLDER = '/uploads' #文件存放路径
ALLOWED_EXTENSIONS = set(['jpg']) #限制上传文件格式 app = Flask(__name__)
app.config['UPLOAD_FOLDER'] = UPLOAD_FOLDER
app.config['MAX_CONTENT_LENGTH'] = 5 * 1024 * 1024
def allowed_file(filename):
return '.' in filename and \
filename.rsplit('.', 1)[1].lower() in ALLOWED_EXTENSIONS
@app.route('/upload/', methods=['GET', 'POST'])
def upload_file():
if request.method == 'POST':
# check if the post request has the file part
if 'file' not in request.files:
flash('No file part')
return redirect(request.url)
file = request.files['file']
# if user does not select file, browser also
# submit an empty part without filename
if file.filename == '':
flash('No selected file')
return redirect(request.url)
if file and allowed_file(file.filename):
filename = secure_filename(file.filename)
file.save(os.path.join(app.config['UPLOAD_FOLDER'], filename))
return '{"filename":"%s"}' % filename
return ''

以上基本上就可以实现上传功能了。

以下是对界面样式,就是选择文件的那个上传按钮样式做了一些修改

如下图:

Ajax+Python flask实现上传文件功能

HTML:此处还添加了文件格式限制,只能选择 .torrent 文件

<div class="divcenter" style="width:1025px">
<div style="width:100%;height:600px">
<div id="div_torrent" style="overflow:hidden">
<a id="btn_file" href="javascript:;" class="file" style="margin-top:5px;margin-bottom:5px;float:left;">选择文件
<input type="file" name="FileUpload" id="FileUpload" accept=".torrent">
</a>
<div id="showFileName" style="float:left;margin-top:7px;margin-bottom:5px;"></div>
<input id="btn_upload" type="button" value="上传" onclick="onsubmit" class="file" style="float:right;width:65px; height: 33px;left: 4px;background-color:rgba(255, 206, 68, 0.6);cursor:hand;margin-top:5px;margin-bottom:5px;margin-right:5px;border-color:red" />
</div>
</div>
</div>

CSS样式:

.file {
position: relative;
display: inline-block;
background: #D0EEFF;
border: 1px solid #99D3F5;
border-radius: 4px;
padding: 4px 12px;
overflow: hidden;
color: #1E88C7;
text-decoration: none;
text-indent:;
line-height: 20px;
}
.file input {
position: absolute;
font-size: 100px;
right:;
top:;
opacity:;
}
.file:hover {
background: #AADFFD;
border-color: #78C3F3;
color: #004974;
text-decoration: none;
}

以上代码选择文件后,不会显示文件名,所以需要添加一个事件:

<script type="text/jscript">
$(function () {
$("#btn_file").on("change","input[type='file']",function(){
var filePath=$(this).val();
if(filePath.indexOf("torrent")!=-1){
var arr=filePath.split('\\');
var fileName=arr[arr.length-1];
$("#showFileName").html(fileName); }else{
$("#showFileName").html("");
}
})
})
</script>

上传的代码没做修改:此处增加了一个最大文件大小限制 5Mb

<script type="text/jscript">

       $(function () {
$("#btn_upload").click(function () {
var fileObj = document.getElementById("FileUpload").files[0]; // js 获取文件对象
if (typeof (fileObj) == "undefined" || fileObj.size <= 0|| $("#showFileName").html()=="") {
alert("请选择BT种子");
return;
}if(fileObj.size>5242880)
{
alert("BT种子限制最大 5Mb");
return;
}
var formFile = new FormData();
formFile.append("action", "UploadTorrentPath");
formFile.append("file", fileObj); //加入文件对象 //第一种 XMLHttpRequest 对象
//var xhr = new XMLHttpRequest();
//xhr.open("post", "/Admin/Ajax/VMKHandler.ashx", true);
//xhr.onload = function () {
// alert("上传完成!");
//};
//xhr.send(formFile); //第二种 ajax 提交 var data = formFile;
$.ajax({
url: "/upload/",
data: data,
type: "Post",
dataType: "json",
cache: false,//上传文件无需缓存
processData: false,//用于对data参数进行序列化处理 这里必须false
contentType: false, //必须
success: function (result) {
alert("上传完成!");
},
error: function (xmlrequest, textStatus, errorThrown) {
alert("上传失败!");
//alert("error:" + textStatus + errorThrown + ":" + JSON.stringify(xmlrequest));
console.log("error:" + textStatus + errorThrown + ":" + JSON.stringify(xmlrequest));
}
})
})
}) </script>

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参考文章1:https://www.cnblogs.com/LoveTX/p/7081515.html

参考文章2:https://www.haorooms.com/post/css_input_uploadmh