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:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
|
<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> |
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:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
|
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文件中的内容:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
|
<?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。
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
|
.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;} } |
以上就是本文的全部内容,希望对大家的学习有所帮助。