以下内容为网络摘抄和实践修改所得，如有雷同，请谅解！！！！
1、首先是前端页面代码：
其中，<input type="file" id="file_input" name="filePath" multiple="multiple"/> ，需要设置multiple属性
<style type="text/css">
.float{
float:left;
width : 100px;
height: 100px;
overflow: hidden;
border: 1px solid #CCCCCC;
border-radius: 10px;
padding: 5px;
margin: 5px;
}
img{
position: relative;
}
.result{
width: 100px;
height: 100px;
text-align: center;
box-sizing: border-box;
}
#file_input{
display: none;
}
.delete{
width: 100px;
height:100px;
position: absolute;
text-align: center;
line-height: 100px;
z-index: 10;
font-size: 30px;
background-color: rgba(255,255,255,0.8);
color: #777;
opacity: 0;
transition-duration: 0.7s;
-webkit-transition-duration: 0.7s;
}
.delete:hover{
cursor: pointer;
opacity: 1;
}
button {
border-color: #4898d5;
/*background-color: #2e8ded;*/
background-color:#62BF00;
color: #fff;
height: 28px;
line-height: 28px;
margin: 0 6px;
padding: 0 15px;
border: 1px solid #dedede;
border-radius: 2px;
font-weight: 400;
cursor: pointer;
text-decoration: none;
}
#submit {
background-color: #2e8ded;
}
#clear {
background-color: #FAAC58;
}
</style>
<body>
<table style="width:100%;">
<tr>
<td style="width:80%">
<label>请选择图像文件：</label>
<button id="select">选择图片</button>
@*<button id="add">追加图片</button>*@
<button id="clear">清空图片</button>
@*<button id="submit" onclick="submitPhoto()" >上传</button>*@
</td>
<td style="width:20%">
<form id="form1" method="post" enctype="multipart/form-data" style="width:95%;text-align:right;">
<input type="file" id="file_input" name="filePath" multiple="multiple"/>
</form>
</td>
</tr>
</table> <div id="append" style="width:100%;height:5px;"></div> </body>
如图：
2、写选择图片（<button id="select">选择图片</button>）和清空图片（<button id="clear">清空图片</button>）的事件，图片显示和删除的方法
var input = document.getElementById("file_input");
var result;
var dataArr = []; // 储存所选图片的结果(文件名和base64数据)
var fd; //FormData方式发送请求
var oSelect = document.getElementById("select");
var oAdd = document.getElementById("add");
var oSubmit = document.getElementById("submit");
var oInput = document.getElementById("file_input");
var oClear = document.getElementById("clear");
if(typeof FileReader==='undefined'){
alert("抱歉，你的浏览器不支持 FileReader");
input.setAttribute('disabled','disabled');
} else {
input.addEventListener('change',readFile,false);
}
oSelect.onclick=function(){
oInput.value = "";
//清空已选图片
$('.float').remove();
dataArr = [];
index = ;
oInput.click();
}
oClear.onclick = function () {
oInput.value = "";
//清空已选图片
$('.float').remove();
dataArr = [];
index = ;
}
function readFile() {
fd = new FormData();
var iLen = this.files.length;
var index = ;
for (var i = ; i < iLen; i++) {
//if (!(input['value'].match(/.jpg|.gif|.png|.jpeg|.bmp/i))) { //判断上传文件格式
if (!this.files[i].name.match(/.jpg|.gif|.png|.jpeg|.bmp/i)) { //判断上传文件格式
return alert("上传的图片中含有格式不正确的图片，请重新选择!请选择.jpg|.gif|.png|.jpeg|.bmp格式的图片");
}
var filereader = new FileReader();
filereader.index = i;
fd.append(i, this.files[i]);
filereader.readAsDataURL(this.files[i]); //转成base64
filereader.fileName = this.files[i].name;
filereader.onload = function (e) {
var imgMsg = {
name: this.fileName,//获取文件名
base64: this.result //filereader.readAsDataURL方法执行完后，filereader.result里
}
dataArr.push(imgMsg);
result = '<div class="delete">delete</div><div class="result"><img src="' + this.result + '" alt=""/><br><span style="margin:0 auto;font-size:9px">' + imgMsg.name + '</span></div>';
var div = document.createElement('div');
div.innerHTML = result;
div['className'] = 'float ';
div['index'] = index;
document.getElementsByTagName('body')[].appendChild(div); //插入dom树
//document.getElementById('append').appendChild(div);
var imgpic = div.getElementsByTagName('img')[];
imgpic.onload = function () {
var nowHeight = ReSizePic(this); //设置图片大小
this.parentNode.style.display = 'block';
var oParent = this.parentNode;
if (nowHeight) {
oParent.style.paddingTop = (oParent.offsetHeight - nowHeight) / + 'px';
}
}
div.onclick = function () {
this.remove(); // 在页面中删除该图片元素
delete dataArr[this.index]; // 删除dataArr对应的数据
}
index++;
}
}
}
function ReSizePic(ThisPic) {
var RePicWidth = ; //这里修改为您想显示的宽度值
var TrueWidth = ThisPic.width; //图片实际宽度
var TrueHeight = ThisPic.height; //图片实际高度
if (TrueWidth > TrueHeight) {
//宽大于高
var reWidth = RePicWidth;
ThisPic.width = reWidth;
//垂直居中
var nowHeight = TrueHeight * (reWidth / TrueWidth);
return nowHeight; //将图片修改后的高度返回，供垂直居中用
} else {
//宽小于高
var reHeight = RePicWidth;
ThisPic.height = reHeight;
}
}
function submitPhoto() {
SubmitPhoto("ControllerName");
}
如图：
3、提交到后台的方法
function SubmitPhoto(controller) {
if (!dataArr.length) {
tipDialog("请选择文件", , );
return;
}
Loading(true, "正在提交数据...");
$("#form1").ajaxSubmit({
url: "/" + controller + "/SubmitPhoto",
type: 'POST',
//data : JSON.stringify(submitArr),
dataType: 'json',
//processData: false, 用FormData传fd时需有这两项
//contentType: false,
success: function (data) {
Loading(false);
layer.alert(data.Message, {
skin: 'layui-layer-lan'
, closeBtn:
, anim: //动画类型
, end: function () {
var index = parent.layer.getFrameIndex(window.name); //获取窗口索引
parent.layer.close(index); // 关闭layer
}
});
}
})
}
如图：
4、后台接收前台传过来的图片数据进行处理
public ActionResult SubmitPhoto()
{
//如果上传文件为空则返回
if (Request.Files.Count > )
{
//文件名
string fileName = "";
string code = "";
List<string> noCodes = new List<string>();
for (int i = ; i < Request.Files.Count; i++)
{
fileName = Request.Files[i].FileName; code = fileName.Substring(, fileName.LastIndexOf('.')); User_EP_Boiler bolier = OperateContext.Current.BllContext.IUser_EP_BoilerBll.GetModel(c => c.No == code && c.DeleteMark == && c.CompId == userContext.User.CompId); if (bolier == null)
{
noCodes.Add(code);
continue;
} string ext = Path.GetExtension(fileName).ToLower();
string filename = Guid.NewGuid().ToString() + ext;
string pathServer = "../Upload/" + userContext.Company.BranchStr + "/User_EPPhotos/" + filename;
bool result = false; bolier.Photos = filename; result = OperateContext.Current.BllContext.IUser_EP_BoilerBll.Modify(bolier); if (result)
{
Request.Files[i].SaveAs(IOHelper.GetMapPath(pathServer));
}
else
{
noCodes.Add(code);
continue;
} }
if (noCodes.Count <= )
{
return Json(new MsgModel() { Message = "全部操作成功", State = , Code = }, "text/html");
}
else
{
string result = "【";
foreach (string codestr in noCodes)
{
result += codestr + ",";
}
result = result.Substring(, result.Length - );
result += "】";
string message = "";
if (noCodes.Count == Request.Files.Count)
{
message = "图像对应的特种设备编号不存在或者操作失败";
}
else
{
message = "部分操作成功，图像对应的特种设备编号：" + result + "不存在或者操作失败";
}
return Json(new MsgModel() { Message = message, State = , Code = }, "text/html");
} }
else
{ return Json(new MsgModel() { Message = "请上传文件", State = }); }
}
页面有些地方使用了easyui和bootstrap的一些内容。。。没有显示出来。
记录下来，以免忘记，以后方便使用。