本文详细介绍如何使用 WebUploader 库实现图片上传功能，包括 HTML 结构、JS 代码及 CSS 样式设置，适用于 SSM（Maven 方式）项目。
工具：
1、ssm（maven方式）
2、webuploader(webuploader.js,weblocder.css,Uploader.swf,images)
webuploader官网地址：http://fex.baidu.com/webuploader/
客户端主要代码：（代码主要来自webuploader官网demo）
HTML部分：
<form>
<div id="uploader" class="wu-example">
<div class="queueList">
<div id="dndArea" class="placeholder">
<div id="filePicker"></div>
<p>或将照片拖到这里，单次最多可选300张</p>
</div>
</div>
<div class="statusBar" style="display: none;">
<div class="progress">
<span class="text">0%</span> <span class="percentage"></span>
</div>
<div class="info"></div>
<div class="btns">
<div id="filePicker2"></div>
<div class="uploadBtn">开始上传</div>
</div>
</div>
</div>
</form>
js部分：
jQuery(function() {
var $ = jQuery, // just in case. Make sure it's not an other libaray.
$wrap = $('#uploader'),
// 图片容器
$queue = $('<ul class="filelist"></ul>').appendTo($wrap.find('.queueList')),
// 状态栏，包括进度和控制按钮
$statusBar = $wrap.find('.statusBar'),
// 文件总体选择信息。
$info = $statusBar.find('.info'),
// 上传按钮
$upload = $wrap.find('.uploadBtn'),
// 没选择文件之前的内容。
$placeHolder = $wrap.find('.placeholder'),
// 总体进度条
$progress = $statusBar.find('.progress').hide(),
// 添加的文件数量
fileCount = 0,
// 添加的文件总大小
fileSize = 0,
// 优化retina, 在retina下这个值是2
ratio = window.devicePixelRatio || 1,
// 缩略图大小
thumbnailWidth = 110 * ratio, thumbnailHeight = 110 * ratio,
// 可能有pedding, ready, uploading, confirm, done.
state = 'pedding',
// 所有文件的进度信息，key为file id
percentages = {},
supportTransition = (function() {
var s = document.createElement('p').style, r = 'transition' in s
|| 'WebkitTransition' in s || 'MozTransition' in s
|| 'msTransition' in s || 'OTransition' in s;
s = null;
return r;
})(),
// WebUploader实例
uploader;
// 检测浏览器是否支持webuploader
if (!WebUploader.Uploader.support()) {
alert('Web Uploader 不支持您的浏览器！如果你使用的是IE浏览器，请尝试升级 flash 播放器');
throw new Error(
'WebUploader does not support the browser you are using.');
}
// 实例化
uploader = WebUploader.create({
// 选完文件后，是否自动上传
auto : false,
// swf文件路径，flash上传时使用
swf : "../../lib/webUploader/0.1.5/Uploader.swf",
// 文件接收服务端路径
server : "",
// 选择文件的按钮
pick : {
id : '#filePicker',
innerHTML : '点击选择图片'
},
// 指定接收哪些类型的文件
accept : {
title : "images", // 文字描述
extensions : "jpg,jpeg,bmp,png",
mimeTypes : "image/jpg,image/x-ms-bmp,image/png"
},
// 配置生成缩略图的选项
thumb : {
width : 110,
height : 110,
// 是否允许放大
allowmagnify : false,
// 是否允许裁剪
crop : true
},
// 配置压缩图片的选项，如果此项为false，则上传前不压缩
compress : false,
// 限制文件总数量，超出则不允许加入队列
fileNumLimit : "5",
// 限制单个文件大小
fileSingleSizeLimit : 50 * 1024, // 50KB
// 去重
duplicate : true,
// 禁掉全局的拖拽功能。这样不会出现图片拖进页面的时候，把图片打开。
disableGlobalDnd : true,
dnd : "#dndArea"
});
// 添加“添加文件”的按钮，
uploader.addButton({
id : '#filePicker2',
label : '继续添加'
});
// 当有文件添加进来时执行，负责view的创建
function addFile(file) {
var $li = $('<li id="' + file.id + '">' + '<p class="title">'
+ file.name + '</p>' + '<p class="imgWrap"></p>'
+ '<p class="progress"><span></span></p>' + '</li>'),
$btns = $(
'<div class="file-panel">' + '<span class="cancel">删除</span>'
+ '<span class="rotateRight">向右旋转</span>'
+ '<span class="rotateLeft">向左旋转</span></div>')
.appendTo($li), $prgress = $li.find('p.progress span'), $wrap = $li
.find('p.imgWrap'), $info = $('<p class="error"></p>'),
showError = function(code) {
switch (code) {
case 'exceed_size':
text = '文件大小超出';
break;
case 'interrupt':
text = '上传暂停';
break;
default:
text = '上传失败，请重试';
break;
}
$info.text(text).appendTo($li);
};
if (file.getStatus() === 'invalid') {
showError(file.statusText);
} else {
// @todo lazyload
$wrap.text('预览中');
uploader.makeThumb(file, function(error, src) {
if (error) {
$wrap.text('不能预览');
return;
}
var img = $('<img src="' + src + '">');
$wrap.empty().append(img);
}, thumbnailWidth, thumbnailHeight);
percentages[file.id] = [ file.size, 0 ];
file.rotation = 0;
}
file.on('statuschange', function(cur, prev) {
if (prev === 'progress') {
$prgress.hide().width(0);
} else if (prev === 'queued') {
$li.off('mouseenter mouseleave');
$btns.remove();
}
// 成功
if (cur === 'error' || cur === 'invalid') {
console.log(file.statusText);
showError(file.statusText);
percentages[file.id][1] = 1;
} else if (cur === 'interrupt') {
showError('interrupt');
} else if (cur === 'queued') {
percentages[file.id][1] = 0;
} else if (cur === 'progress') {
$info.remove();
$prgress.css('display', 'block');
} else if (cur === 'complete') {
$li.append('<span class="success"></span>');
}
$li.removeClass('state-' + prev).addClass('state-' + cur);
});
$li.on('mouseenter', function() {
$btns.stop().animate({
height : 30
});
});
$li.on('mouseleave', function() {
$btns.stop().animate({
height : 0
});
});
$btns
.on(
'click',
'span',
function() {
var index = $(this).index(), deg;
switch (index) {
case 0:
uploader.removeFile(file);
return;
case 1:
file.rotation += 90;
break;
case 2:
file.rotation -= 90;
break;
}
if (supportTransition) {
deg = 'rotate(' + file.rotation + 'deg)';
$wrap.css({
'-webkit-transform' : deg,
'-mos-transform' : deg,
'-o-transform' : deg,
'transform' : deg
});
} else {
$wrap
.css(
'filter',
'progid:DXImageTransform.Microsoft.BasicImage(rotation='
+ (~~((file.rotation / 90) % 4 + 4) % 4)
+ ')');
}
});
$li.appendTo($queue);
}
// 负责view的销毁
function removeFile(file) {
var $li = $('#' + file.id);
delete percentages[file.id];
updateTotalProgress();
$li.off().find('.file-panel').off().end().remove();
}
function updateTotalProgress() {
var loaded = 0, total = 0, spans = $progress.children(), percent;
$.each(percentages, function(k, v) {
total += v[0];
loaded += v[0] * v[1];
});
percent = total ? loaded / total : 0;
spans.eq(0).text(Math.round(percent * 100) + '%');
spans.eq(1).css('width', Math.round(percent * 100) + '%');
updateStatus();
}
function updateStatus() {
var text = '', stats;
if (state === 'ready') {
text = '选中' + fileCount + '张图片，共'
+ WebUploader.formatSize(fileSize) + '。';
} else if (state === 'confirm') {
stats = uploader.getStats();
if (stats.uploadFailNum) {
text = '已成功上传'
+ stats.successNum
+ '张照片至XX相册，'
+ stats.uploadFailNum
+ '张照片上传失败，<a class="retry" href="#">重新上传</a>失败图片或<a class="ignore" href="#">忽略</a>'
}
} else {
stats = uploader.getStats();
text = '共' + fileCount + '张（' + WebUploader.formatSize(fileSize)
+ '），已上传' + stats.successNum + '张';
if (stats.uploadFailNum) {
text += '，失败' + stats.uploadFailNum + '张';
}
}
$info.html(text);
}
function setState(val) {
var file, stats;
if (val === state) {
return;
}
$upload.removeClass('state-' + state);
$upload.addClass('state-' + val);
state = val;
switch (state) {
case 'pedding':
$placeHolder.removeClass('element-invisible');
$queue.parent().removeClass('filled');
$queue.hide();
$statusBar.addClass('element-invisible');
uploader.refresh();
break;
case 'ready':
$placeHolder.addClass('element-invisible');
$('#filePicker2').removeClass('element-invisible');
$queue.parent().addClass('filled');
$queue.show();
$statusBar.removeClass('element-invisible');
uploader.refresh();
break;
case 'uploading':
$('#filePicker2').addClass('element-invisible');
$progress.show();
$upload.text('暂停上传');
break;
case 'paused':
$progress.show();
$upload.text('继续上传');
break;
case 'confirm':
$progress.hide();
$upload.text('开始上传').addClass('disabled');
stats = uploader.getStats();
if (stats.successNum && !stats.uploadFailNum) {
setState('finish');
return;
}
break;
case 'finish':
stats = uploader.getStats();
if (stats.successNum) {
alert('上传成功');
} else {
// 没有成功的图片，重设
state = 'done';
location.reload();
}
break;
}
updateStatus();
}
uploader.onUploadProgress = function(file, percentage) {
var $li = $('#' + file.id), $percent = $li.find('.progress span');
$percent.css('width', percentage * 100 + '%');
percentages[file.id][1] = percentage;
updateTotalProgress();
};
uploader.onFileQueued = function(file) {
fileCount++;
fileSize += file.size;
if (fileCount === 1) {
$placeHolder.addClass('element-invisible');
$statusBar.show();
}
addFile(file);
setState('ready');
updateTotalProgress();
};
uploader.onFileDequeued = function(file) {
fileCount--;
fileSize -= file.size;
if (!fileCount) {
setState('pedding');
}
removeFile(file);
updateTotalProgress();
};
uploader.on('all', function(type) {
var stats;
switch (type) {
case 'uploadFinished':
setState('confirm');
break;
case 'startUpload':
setState('uploading');
break;
case 'stopUpload':
setState('paused');
break;
}
});
uploader.onError = function(code) {
alert('Eroor: ' + code);
};
$upload.on('click', function() {
if ($(this).hasClass('disabled')) {
return false;
}
if (state === 'ready') {
uploader.upload();
} else if (state === 'paused') {
uploader.upload();
} else if (state === 'uploading') {
uploader.stop();
}
});
$info.on('click', '.retry', function() {
uploader.retry();
});
$info.on('click', '.ignore', function() {
alert('todo');
});
$upload.addClass('state-' + state);
updateTotalProgress();
});
注：
1、mimeType最好写全，如果简写成“image/*”,会出现页面点击无反应，过半天才弹窗。附上一个mimeType表链接：https://blog.youkuaiyun.com/qq_19916577/article/details/46502761
2、限制单张图片文件的大小，单位是B。
3、此份代码有个bug，点击选择图片不居中显示，某位大神如果解决了麻烦告知一下。
css部分：
#container {
color: #838383;
font-size: 12px;
}
#uploader .queueList {
margin: 20px;
border: 3px dashed #e6e6e6;
}
#uploader .queueList.filled {
padding: 17px;
margin: 0;
border: 3px dashed transparent;
}
#uploader .queueList.webuploader-dnd-over {
border: 3px dashed #999999;
}
#uploader p {margin: 0;}
.element-invisible {
position: absolute !important;
clip: rect(1px 1px 1px 1px); /* IE6, IE7 */
clip: rect(1px,1px,1px,1px);
}
#uploader .placeholder {
min-height: 350px;
padding-top: 178px;
text-align: center;
background: url(../images/image.png) center 93px no-repeat;
color: #cccccc;
font-size: 18px;
position: relative;
}
#uploader .placeholder .webuploader-pick {
font-size: 18px;
background: #00b7ee;
border-radius: 3px;
line-height: 44px;
padding: 0 30px;
*width: 120px;
color: #fff;
display: inline-block;
margin: 0 auto 20px auto;
cursor: pointer;
box-shadow: 0 1px 1px rgba(0, 0, 0, 0.1);
}
#uploader .placeholder .webuploader-pick-hover {
background: #00a2d4;
}
#uploader .placeholder .flashTip {
color: #666666;
font-size: 12px;
position: absolute;
width: 100%;
text-align: center;
bottom: 20px;
}
#uploader .placeholder .flashTip a {
color: #0785d1;
text-decoration: none;
}
#uploader .placeholder .flashTip a:hover {
text-decoration: underline;
}
#uploader .filelist {
list-style: none;
margin: 0;
padding: 0;
}
#uploader .filelist:after {
content: '';
display: block;
width: 0;
height: 0;
overflow: hidden;
clear: both;
}
#uploader .filelist li {
width: 110px;
height: 110px;
background: url(../images/bg.png) no-repeat;
text-align: center;
margin: 0 8px 20px 0;
position: relative;
display: inline;
float: left;
overflow: hidden;
font-size: 12px;
}
#uploader .filelist li p.log {
position: relative;
top: -45px;
}
#uploader .filelist li p.title {
position: absolute;
top: 0;
left: 0;
width: 100%;
overflow: hidden;
white-space: nowrap;
text-overflow : ellipsis;
top: 5px;
text-indent: 5px;
text-align: left;
}
#uploader .filelist li p.progress {
position: absolute;
width: 100%;
bottom: 0;
left: 0;
height: 8px;
overflow: hidden;
z-index: 50;
margin: 0;
border-radius: 0;
background: none;
-webkit-box-shadow: 0 0 0;
}
#uploader .filelist li p.progress span {
display: none;
overflow: hidden;
width: 0;
height: 100%;
background: #1483d8 url(../images/progress.png) repeat-x;
-webit-transition: width 200ms linear;
-moz-transition: width 200ms linear;
-o-transition: width 200ms linear;
-ms-transition: width 200ms linear;
transition: width 200ms linear;
-webkit-animation: progressmove 2s linear infinite;
-moz-animation: progressmove 2s linear infinite;
-o-animation: progressmove 2s linear infinite;
-ms-animation: progressmove 2s linear infinite;
animation: progressmove 2s linear infinite;
-webkit-transform: translateZ(0);
}
@-webkit-keyframes progressmove {
0% {
background-position: 0 0;
}
100% {
background-position: 17px 0;
}
}
@-moz-keyframes progressmove {
0% {
background-position: 0 0;
}
100% {
background-position: 17px 0;
}
}
@keyframes progressmove {
0% {
background-position: 0 0;
}
100% {
background-position: 17px 0;
}
}
#uploader .filelist li p.imgWrap {
position: relative;
z-index: 2;
line-height: 110px;
vertical-align: middle;
overflow: hidden;
width: 110px;
height: 110px;
-webkit-transform-origin: 50% 50%;
-moz-transform-origin: 50% 50%;
-o-transform-origin: 50% 50%;
-ms-transform-origin: 50% 50%;
transform-origin: 50% 50%;
-webit-transition: 200ms ease-out;
-moz-transition: 200ms ease-out;
-o-transition: 200ms ease-out;
-ms-transition: 200ms ease-out;
transition: 200ms ease-out;
}
#uploader .filelist li img {
width: 100%;
}
#uploader .filelist li p.error {
background: #f43838;
color: #fff;
position: absolute;
bottom: 0;
left: 0;
height: 28px;
line-height: 28px;
width: 100%;
z-index: 100;
}
#uploader .filelist li .success {
display: block;
position: absolute;
left: 0;
bottom: 0;
height: 40px;
width: 100%;
z-index: 200;
background: url(../images/success.png) no-repeat right bottom;
}
#uploader .filelist div.file-panel {
position: absolute;
height: 0;
filter: progid:DXImageTransform.Microsoft.gradient(GradientType=0,startColorstr='#80000000', endColorstr='#80000000')\0;
background: rgba( 0, 0, 0, 0.5 );
width: 100%;
top: 0;
left: 0;
overflow: hidden;
z-index: 300;
}
#uploader .filelist div.file-panel span {
width: 24px;
height: 24px;
display: inline;
float: right;
text-indent: -9999px;
overflow: hidden;
background: url(../images/icons.png) no-repeat;
margin: 5px 1px 1px;
cursor: pointer;
}
#uploader .filelist div.file-panel span.rotateLeft {
background-position: 0 -24px;
}
#uploader .filelist div.file-panel span.rotateLeft:hover {
background-position: 0 0;
}
#uploader .filelist div.file-panel span.rotateRight {
background-position: -24px -24px;
}
#uploader .filelist div.file-panel span.rotateRight:hover {
background-position: -24px 0;
}
#uploader .filelist div.file-panel span.cancel {
background-position: -48px -24px;
}
#uploader .filelist div.file-panel span.cancel:hover {
background-position: -48px 0;
}
#uploader .statusBar {
height: 63px;
border-top: 1px solid #dadada;
padding: 0 20px;
line-height: 63px;
vertical-align: middle;
position: relative;
}
#uploader .statusBar .progress {
border: 1px solid #1483d8;
width: 198px;
background: #fff;
height: 18px;
position: relative;
display: inline-block;
text-align: center;
line-height: 20px;
color: #6dbfff;
position: relative;
margin: 0 10px 0 0;
}
#uploader .statusBar .progress span.percentage {
width: 0;
height: 100%;
left: 0;
top: 0;
background: #1483d8;
position: absolute;
}
#uploader .statusBar .progress span.text {
position: relative;
z-index: 10;
}
#uploader .statusBar .info {
display: inline-block;
font-size: 14px;
color: #666666;
}
#uploader .statusBar .btns {
position: absolute;
top: 10px;
right: 20px;
line-height: 40px;
}
#filePicker2 {
display: inline-block;
float: left;
}
#uploader .statusBar .btns .webuploader-pick,
#uploader .statusBar .btns .uploadBtn,
#uploader .statusBar .btns .uploadBtn.state-uploading,
#uploader .statusBar .btns .uploadBtn.state-paused {
background: #ffffff;
border: 1px solid #cfcfcf;
color: #565656;
padding: 0 18px;
display: inline-block;
border-radius: 3px;
margin-left: 10px;
cursor: pointer;
font-size: 14px;
float: left;
}
#uploader .statusBar .btns .webuploader-pick-hover,
#uploader .statusBar .btns .uploadBtn:hover,
#uploader .statusBar .btns .uploadBtn.state-uploading:hover,
#uploader .statusBar .btns .uploadBtn.state-paused:hover {
background: #f0f0f0;
}
#uploader .statusBar .btns .uploadBtn {
background: #00b7ee;
color: #fff;
border-color: transparent;
}
#uploader .statusBar .btns .uploadBtn:hover {
background: #00a2d4;
}
#uploader .statusBar .btns .uploadBtn.disabled {
pointer-events: none;
opacity: 0.6;
}
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