Web上傳檔案的三種解決方案分享給大家：
這裡我要使用的是form法。通過為表單元素設定enctype=”multipart/form-data”屬性，讓表單提交的資料以二進位編碼的方式提交，在接收此請求的Servlet中用二進位流來擷取內容，就可以取得上傳檔案的內容，從而實現檔案的上傳。
表單元素的enctype屬性指定的是表單資料的編碼方式，該屬性有3個值：
在網上找到了兩種方式，PHP配合apc實現和利用uploadprogress實現，這次我要使用的是uploadprogress，點擊地址可以下載到php相應版本的dll。安裝php_uploadprogress.dll擴充,重啟apache。
進度條實現原理：
這裡用到了一個iframe無重新整理上傳檔案的方法。
上傳完成後的樣子如圖：
<body> <div style="padding:20px"> <form action="action.php" enctype="multipart/form-data" method="post" target="iframeUpload"> <iframe name="iframeUpload" width="400" height="400" frameborder='1'></iframe> <input type="hidden" name="UPLOAD_IDENTIFIER" value="1" /> <input id="file1" name="file1" type="file"/> <input value="上傳" type="submit" onclick="startProgress()"/> </form> </div> <div style="width: 500px; height: 20px;border:1px solid red"> <div style="position: relative; height: 20px; background-color: purple; width: 0%;" class="barinner"></div> </div> <div id='showNum'></div> <div class="prbar"> <div class="prpos barinner"></div> </div> </body>
上面的HTML代碼中要注意下UPLOAD_IDENTIFIER，這個是用來定位查看哪個檔案的上傳進度的。我這裡就寫死為一個1，大家可以寫成一個php產生的隨機數。下面是JS指令碼：
var proNum=0; var loop=0; var progressResult = ""; var interval; function sendURL() { $.ajax({ type : 'GET', url : "getprogress.php", async : true, cache : false, dataType : 'json', data: "progress_key=" + $('input[name=UPLOAD_IDENTIFIER]').val(), success : function(e) { proNum=parseInt(e); if(e){ $('.barinner').css('width', proNum+"%"); $('#showNum').html(proNum+"%"); setTimeout("getProgress()", 200); }else{ if(interval == 1){ $('.barinner').css('width', "100%"); $('#showNum').html("100%"); } } } }); } function getProgress(){ loop++; sendURL(); } function startProgress(){ interval = 1; $('.barinner').css('width', proNum+"%"); $('#showNum').html(proNum+"%"); setTimeout("getProgress()", 500); }
下面是getprogress.php檔案中的內容：
<?php if (function_exists("uploadprogress_get_info")) { $info = uploadprogress_get_info($_GET['progress_key']); if(!empty($info)){ if(($info['bytes_uploaded'] < $info['bytes_total']) && !empty($info['bytes_uploaded']) && !empty($info['bytes_total'])){ $proNum = floor(($info['bytes_uploaded']/$info['bytes_total'])*100); }else{ $proNum = 100; } echo $proNum; }else{ echo 0; } }
在上傳完成後，我展示了兩種進度條的CSS，第二種是用最新的CSS3寫的。用到了一些CSS3的動畫屬性。
.prbar { margin:5px; width:500px; background-color:#dddddd; overflow:hidden; /* 邊框效果 */ border: 1px solid #bbbbbb; -moz-border-radius: 15px; border-radius: 15px; /* 為進度條增加陰影製作效果 */ -webkit-box-shadow: 0px 2px 4px #555555; -moz-box-shadow: 0px 2px 4px #555555; box-shadow: 0px 2px 4px #555555; } /* No rounded corners for Opera, because the overflow:hidden dont work with rounded corners */ doesnotexist:-o-prefocus, .prbar { border-radius:0px; } .prpos { width:0%; height:30px; background-color:#3399ff; border-right:1px solid #bbbbbb; /* CSS3 進度條漸層 */ transition: width 2s ease; -webkit-transition: width 0s ease; -o-transition: width 0s ease; -moz-transition: width 0s ease; -ms-transition: width 0s ease; /* CSS3 Stripes */ background-image: linear-gradient(135deg,#3399ff 25%,#99ccff 25%,#99ccff 50%, #3399ff 50%, #3399ff 75%,#99ccff 75%,#99ccff 100%); background-image: -moz-linear-gradient(135deg,#3399ff 25%,#99ccff 25%,#99ccff 50%, #3399ff 50%, #3399ff 75%,#99ccff 75%,#99ccff 100%); background-image: -ms-linear-gradient(135deg,#3399ff 25%,#99ccff 25%,#99ccff 50%, #3399ff 50%, #3399ff 75%,#99ccff 75%,#99ccff 100%); background-image: -o-linear-gradient(135deg,#3399ff 25%,#99ccff 25%,#99ccff 50%, #3399ff 50%, #3399ff 75%,#99ccff 75%,#99ccff 100%); background-image: -webkit-gradient(linear, 100% 100%, 0 0,color-stop(.25, #99ccff), color-stop(.25, #3399ff),color-stop(.5, #3399ff),color-stop(.5, #99ccff),color-stop(.75, #99ccff),color-stop(.75, #3399ff),color-stop(1, #3399ff)); background-image: -webkit-linear-gradient(135deg,#3399ff 25%,#99ccff 25%,#99ccff 50%, #3399ff 50%, #3399ff 75%,#99ccff 75%,#99ccff 100%); background-size: 40px 40px; /* Background stripes animation */ animation: bganim 3s linear 2s infinite; -moz-animation: bganim 3s linear 2s infinite; -webkit-animation: bganim 3s linear 2s infinite; -o-animation: bganim 3s linear 2s infinite; -ms-animation: bganim 3s linear 2s infinite; } @keyframes bganim { from {background-position:0px;} to { background-position:40px;} } @-moz-keyframes bganim { from {background-position:0px;} to { background-position:40px;} } @-webkit-keyframes bganim { from {background-position:0px;} to { background-position:40px;} } @-o-keyframes bganim { from {background-position:0px;} to { background-position:40px;} } @-ms-keyframes bganim { from {background-position:0px;} to { background-position:40px;} }
以上就是本文的全部內容，希望對大家的學習有所協助。
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