多文件上传，使用js对文件进行校验，包括文件单个大小，格式，总的文件大小，文件是否为空等

来源：互联网发布：blast算法编辑：程序博客网时间：2024/05/19 18:15

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">

<title>My JSP 'upload.jsp' starting page</title>

<script type="text/javascript" src="js/jquery-2.1.1.js"></script>
<script type="text/javascript">
var num=0;

var totalSizeArray={};

//添加附件

function AddAttachments()
{
document.getElementById('attach').innerText = "继续添加附件";
tb = document.getElementById('attAchments');
newRow = tb.insertRow();
newRow.insertCell().innerHTML = "<input name='file' size='50' type='file' id=file"+num+">  <input type='button' value='删除' onclick='delFile(this.parentElement.parentElement.rowIndex)'>    <label id=p"+num+"></label>";
totalSizeArray[num]=0;
num ++;

}

//删除附件类容

function delFile(index)
{
totalSizeArray[index]=0;
document.getElementById('attAchments').deleteRow(index);
tb.rows.length > 0?document.getElementById('attach').innerText = "继续添加附件":document.getElementById('attach').innerText = "添加附件";
}
$(document).ready(function(){
$("#btnSend").click(function(){

var fileLength=$("input[type='file']").length;

//判断是否有上传的文件

if(fileLength==0){
alert("当前没有可上传的文件");
return false;
}else{
for(var i=0;i<document.form1.elements.length-1;i++)

{

//判断文控件间内容是否为空

if(document.form1.elements[i].value=="")
{
alert("当前表单不能有空项");
document.form1.elements[i].focus();
return false;
}

}

//判断文件总大小是否大于10M

var ext = filepath.substring(extStart, filepath.length).toUpperCase();

//判断文件类型

if (ext==".ZIP"||ext==".RAR" ||ext==".TXT") {
alert("不能上传后缀名为.txt、.rar、.zip类型的文件！");
var obj = document.getElementById(fileId) ;
obj.outerHTML=obj.outerHTML;
$("#"+count).text("");
return false;
} else { $("#"+count).text(filepath);}
var fileSize=0;
fileSize=this.files[0].size;
var size=fileSize/1024;

size=Math.round(size);

//判断单个文件是否大于2M

if(size>1024*2){
alert("单个文件大小不能超过2M,请重新选择文件！");
var obj = document.getElementById(fileId) ;
obj.outerHTML=obj.outerHTML;
$("#"+count).text("");
}else{
totalSizeArray[countNum]=size;
size=$("#"+count).text()+"\t\t\t\t"+size;
$("#"+count).text(size+"KB");
}
});
});

</script>
<body>
<form id="form1" name="form1" method="POST" enctype="multipart/form-data" action="uploadServlet">
<table id="attAchments">
</table>
</form>
<a id="attach" onclick="AddAttachments();" href="javascript:;" name="attach">添加附件</a>
<input type="button" id="btnSend" value=" 上传 "/>
</body>
</html>

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