看了别人写的 自己照着写了一下
<%@ 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 ‘sc.jsp‘ starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
-->
<script src="<%=basePath%>js/jquery-1.7.2.min.js" type="text/javascript"></script>
<script>
function showPicture(value){
// var docObj=document.getElementById("file");
var docObj=$("#file").get(0);
// var imgObjPreview=document.getElementById("myPic");
var imgObjPreview= $("#myPic").get(0);
if(docObj.files &&docObj.files[0])
{
//火狐下，直接设img属性
imgObjPreview.style.display = ‘block‘;
imgObjPreview.style.width = ‘150px‘;
imgObjPreview.style.height = ‘180px‘;
//imgObjPreview.src = docObj.files[0].getAsDataURL();
//火狐7以上版本不能用上面的getAsDataURL()方式获取，需要一下方式
imgObjPreview.src = window.URL.createObjectURL(docObj.files[0]);
}
else
{
//IE下，使用滤镜
docObj.select();
var imgSrc = document.selection.createRange().text;
// var localImagId = document.getElementById("localImg");
var localImagId = $("#localImg").get(0);
//必须设置初始大小
localImagId.style.width = "150px";
localImagId.style.height = "180px";
//图片异常的捕捉，防止用户修改后缀来伪造图片
try{
localImagId.style.filter="progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale)";
localImagId.filters.item("DXImageTransform.Microsoft.AlphaImageLoader").src = imgSrc;
}
catch(e)
{
alert("您上传的图片格式不正确，请重新选择!");
return false;
}
imgObjPreview.style.display = ‘none‘;
document.selection.empty();
}
return true;
}
</script>
</head>
<body>
<div id="localImg">
<img src="" id="myPic" />
</div>
<form id="form" action="#" method="post" enctype="multipart/form-data">
<input type="file" id="file" name="file" onchange="showPicture(this.value)">
</form>
</body>
</html>
页面
时间： 2024-08-26 02:26:48