上传图片在页面上显示

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>