Ajax+Python flask实现上传文件功能
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:
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: 0; line-height: 20px; } .file input { position: absolute; font-size: 100px; right: 0; top: 0; opacity: 0; } .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