spring,图片上传

<div class="line_grid">
<div class="g_2 g_2M">
<span class="label">电影图片：</span>
</div>
<div class="g_10 g_10M">
<input id="pic" type="hidden" value="${hs.pic}" />
<input id="uploadFile" name="uploadFile" accept=".bmp,.gif,.jpeg,.png,.jpg" type="file" onchange="previewImagepr(this);" />
<div id="preview"></div>
</div>
<div class="clear"></div>
</div>

var MAXWIDTH  = 100;
var MAXHEIGHT = 100;
function previewImagepr(file){
var div = $('#preview');
if (file.files){
$.each(file.files,function(index,item){
if((item.type == 'image/bmp') || (item.type == 'image/gif') || (item.type == 'image/jpeg') || (item.type == 'image/png')){
//	目前仅支持这四种格式的图片
var fileList = [];
imgFile = {
file:item		//file
};
fileList[fileList.length] = imgFile;
div.empty();
div.append("<div style='width:100px;height:100px;margin:3px;border:1px solid #000;float:left;'>"
+"<img name='imghead' >"
+"</div>");
var img = $('img[name=imghead]').last();
var reader = new FileReader();
reader.readAsDataURL(item);
reader.onload = function(evt){
img.attr('src',evt.target.result);
}
img.on('load',function(){
var rect = clacImgZoomParam(MAXWIDTH, MAXHEIGHT, this.width, this.height);
img.attr('width',rect.width);
img.attr('height',rect.height);
img.css({'marginLeft':rect.left,'marginTop':rect.top});
});
var formdata = new FormData(this);
for(var index in fileList){
formdata.append("fileUpload"+index, fileList[index].file);
}
$.ajax({
type:'POST',
url : CONTEXT_PATH + "/common/pic.do",
data:formdata,
/**
*必须false才会自动加上正确的Content-Type
*/
contentType:false,
/**
* 必须false才会避开jQuery对 formdata 的默认处理
* XMLHttpRequest会对 formdata 进行正确的处理
*/
processData:false,
success: function(data){
console.log(data);
$('#pic').val(data.res);
},
error:function(){
alert('上传失败!');
}
});
}
});
}
}

//调整图片大小
function clacImgZoomParam( maxWidth, maxHeight, width, height ){
param = {width:0,height:0,left:0,top:0};
if( width>maxWidth || height>maxHeight ){
rateWidth = width / maxWidth;
rateHeight = height / maxHeight;
if( rateWidth > rateHeight ){
param.width =  maxWidth;
param.height = Math.round(height / rateWidth);
}else{
param.width = Math.round(width / rateHeight);
param.height = maxHeight;
}
}
//居中显示
param.left = Math.round((maxWidth - param.width) / 2);
param.top = Math.round((maxHeight - param.height) / 2);
return param;
}

@RequestMapping("/pic.do")
@ResponseBody
public Parameter page(HttpServletRequest request,
HttpServletResponse response) throws IllegalStateException,
IOException {
Parameter parameter = new Parameter();
Log.info("movie图片上传");
// 创建一个通用的多部分解析器
CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver(
request.getSession().getServletContext());
// 判断 request 是否有文件上传,即多部分请求
if (multipartResolver.isMultipart(request)) {
MultipartHttpServletRequest multiRequest = (MultipartHttpServletRequest) request;
//			Map<String, MultipartFile> files = multiRequest.getFileMap();
Iterator<String> iter = multiRequest.getFileNames();
while (iter.hasNext()) {
MultipartFile file = multiRequest.getFile(iter.next());
if (file != null) {
String path = request.getRealPath("/") + "res/";
String pid = UUID.randomUUID().toString().toUpperCase();
String name = file.getOriginalFilename();
String jpg = name.substring(name.lastIndexOf("."));
parameter.setRes(pid+jpg);
File localFile = new File(path+pid+jpg);
file.transferTo(localFile);
}
}
}
return parameter;
}