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Spring mvc 上传进度条实现
小程序：扫一扫查出行【扫一扫了解最新限行尾号】
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以下的仅仅是学习而已，记录以下笔记
1 springmvc 进度条，要实现ProgressListener接口，实现方法update(long readLength, long contextLength, int items)
代码如下：
public class mProgressListener implements ProgressListener {
String pCount=null;
int sa=0;
public String getpCount() {
return pCount;
}
/* 第一个参数代表当前已读了多少字节,第二个参数代表整个表单的长度也可以当做文件的总大小，第三个参数是代表已解析到第几个（这里对你不重要） */
@Override
public void update(long readLength, long contextLength, int items) {
double result = (readLength / (double)1048576) / (contextLength / (double)1048576);
if(contextLength<0){
}else{
long read=readLength/1048576;
long context=contextLength/1048576;
sa=(int)Math.round((100.0)*read/context);
}
//DecimalFormat df = new DecimalFormat("#.00");
//System.out.println(read+"/"+context+"="+sa+"：contextLength="+contextLength);
NumberFormat nf = NumberFormat.getPercentInstance();
// System.out.println((readLength / (double)1048576) + "/" +( contextLength / (double)1048576)
// + "=" + nf.format(result));
pCount =sa+"";
}
}
2，重写类CommonsMultipartResolver
public class CommonsMultipartResolver extends
org.springframework.web.multipart.commons.CommonsMultipartResolver { HttpServletRequest request; @Override
protected FileUpload newFileUpload(FileItemFactory fileItemFactory) { ServletFileUpload upload = new ServletFileUpload(fileItemFactory);
upload.setSizeMax(-1);
if (request != null) {
mProgressListener pListener = new mProgressListener();
upload.setProgressListener(pListener);
request.getSession().setAttribute("pListener", pListener);
} return upload;
} @Override
public MultipartHttpServletRequest resolveMultipart(HttpServletRequest arg0)
throws MultipartException {
this.request = arg0;
return super.resolveMultipart(arg0);
}
}
3，spring-servlet.xml 修改为
<!-- 支持上传文件 -->
<bean id="multipartResolver" class="com.glass.test.CommonsMultipartResolver">
<property name="maxUploadSize" value="-1" />
</bean>
4，jsp界面运用ajax实现数据的互交，
用到AjaxFileUpload.js 实现文件的异步传输
<script type="text/javascript">
$(function(){
$("#submin").click(function(){
$.ajaxFileUpload({
url: 'upLoadProgress.htm',
type: 'post',
secureuri: false, //一般设置为false
fileElementId: 'file', // 上传文件的id、name属性名
dataType: 'text', //返回值类型，一般设置为json、application/json
// elementIds: elementIds, //传递参数到服务器
success: function(data, status){
layer.alert(data);
},
error: function(data, status, e){
alert(e);
}
});
// $("#pform").submit();
// $("$pCount").text("51465") ;
startProgress();
return false;
});
function startProgress(){
$.ajax({
type: "post",
dataType: "text",
url: "testProgress.htm",
data: "",
success: function (data) {//data是没有小数的整型，
var num= parseInt(data)*0.01;
$("#flownum").text(data+"%") ;//显示到界面
$("#pCount").attr("width",(1000*num)+"px");
if(num<1){
setTimeout(startProgress(),2000);
}
// layer.alert(data);
}
});}
});
</script>
4,Controller 接收上传
5，Progress的controller如下：
@RequestMapping(value ="testProgress")
public void progress(HttpServletResponse response,
HttpServletRequest request) {
mProgressListener pListener= (mProgressListener) request.getSession().getAttribute("pListener");
setMessage(pListener.getpCount());//自己写的方法
Ajax(response);//自己写的方法 }
