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JSP上传文件(如图片)的最简单的Demo

2012-01-12 21:07 381 查看
<%@ page contentType="text/html; charset=gb2312"%>

<%@ page import="com.jspsmart.upload.*"%>

<%@ page import="java.util.Calendar,java.io.File"%>

<%

request.setCharacterEncoding("gb2312");

try{

SmartUpload su = new SmartUpload(); /// 上传文件组件

long file_max_size = 4000000;

su.initialize(pageContext);// 上传初始化

su.upload();

// 将上传文件全部保存到指定目录

String temp="upload/images";

//创建文件夹使用绝对路径

String uploadPath =request.getRealPath("/")+temp;

//如果文件夹不存在,则创建此文件夹

if(!new File(uploadPath).isDirectory()){

new File(uploadPath).mkdirs();

}

Files files=su.getFiles();

//得到上传的文件

com.jspsmart.upload.File file = su.getFiles().getFile(0);

if(file.isMissing()){

System.out.println("missing");

}

String postfix="."+file.getFileExt();

//为上传的文件起别名

System.out.println("后缀名是:" + postfix);

if(!postfix.equals(".jpg")){

%>

<script type="text/javascript">

alert("不支持此图片格式");

</script>

<%

}else{

String fileName = "test";

//这个就是可以得到图片的路径了

String strtemp=uploadPath+"/"+ fileName + postfix;

System.out.println(strtemp);

file.saveAs(strtemp); ///参数是路径 (完整)

%>

<script>

alert("图片上传成功!");

</script>

<%

}

}catch (Exception e){

System.out.println(e.getMessage());

%>

<script type="text/javascript">

alert("图片上传失败!");

</script>

<%

}

%>

</script>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<title>首页</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="dscription" content="This is my page">

</head>

<body>

<form action="ImageUpload.jsp" method="post" enctype="multipart/form-data">

<table>

<tr>

<td width="120" align="center">路径:</td>

<td width="180"><input type="file" name="file" class="from_len21" contenteditable="false"></td>

</tr>

<tr>

<td>

<input type="submit" value="确定" />

</td>

</tr>

</table>

</form>

</body>

</html>
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