web上传文件的三种解决方案分享给大家:
这里我要使用的是form法。通过为表单元素设置enctype=”multipart/form-data”属性,让表单提交的数据以二进制编码的方式提交,在接收此请求的servlet中用二进制流来获取内容,就可以取得上传文件的内容,从而实现文件的上传。
表单元素的enctype属性指定的是表单数据的编码方式,该属性有3个值:
在网上找到了两种方式,php配合apc实现和利用uploadprogress实现,这次我要使用的是uploadprogress,点击地址可以下载到php相应版本的dll。安装php_uploadprogress.dll扩展,重启apache。
进度条实现原理:
这里用到了一个iframe无刷新上传文件的方法。
上传完成后的样子如图:
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<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= "上传" 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>
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上面的html代码中要注意下upload_identifier,这个是用来定位查看哪个文件的上传进度的。我这里就写死为一个1,大家可以写成一个php生成的随机数。下面是js脚本:
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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);
}
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下面是getprogress.php文件中的内容:
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<?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;
}
}
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在上传完成后,我展示了两种进度条的css,第二种是用最新的css3写的。用到了一些css3的动画属性。
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.prbar {
margin:5px;
width:500px;
background-color:#dddddd;
overflow:hidden;
/* 边框效果 */
border: 1px solid #bbbbbb;
-moz-border-radius: 15px;
border-radius: 15px;
/* 为进度条增加阴影效果 */
-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 进度条渐变 */
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;}
}
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以上就是本文的全部内容,希望对大家的学习有所帮助。