JSP—实现文件保存

偏执的太偏执、 2022-07-14 06:43 185阅读 0赞

## upload.html    ##

<html>
    <head>
    <title>请选择上传的图片</title>
    </head>
    <body>
    	<table border="0" align="center" cellpadding="0" cellspacing="0">
    		<tr>
    			<td height="45" align="center" valign="middle"><form
    					action="uploadimage.jsp" method="post"
    					enctype="multipart/form-data" name="form1">
    					请选择上传的图片 <input type="file" name="file"> <input
    						type="submit" name="Submit" value="上传">
    				</form>
    			</td>
    		</tr>
    	</table>
    </body>
    </html>

## uploadimage.jsp ##

<%@ page contentType="text/html;charset=gb2312" language="java"
    	import="java.io.*,java.awt.Image,java.awt.image.*,com.sun.image.codec.jpeg.*,
    java.sql.*,com.jspsmart.upload.*,java.util.*"%>
    <%
    	SmartUpload mySmartUpload = new SmartUpload();
    	long file_size_max = 4000000;
    	String fileName2 = "", ext = "", testvar = "";
    	String url = "uploadfile/images/"; //应保证在根目录中有此目录的存在
    	//初始化
    	mySmartUpload.initialize(pageContext);
    	//只允许上载此类文件
    	try {
    		mySmartUpload.setAllowedFilesList("jpg,gif");
    		//上载文件
    
    		mySmartUpload.upload();
    
    	} catch (Exception e) {
    %>
    <SCRIPT language=javascript>
    	alert("只允许上传.jpg和.gif类型图片文件");
    	window.location = 'upfile.jsp';
    </script>
    <%
    	}
    
    	try {
    		
    		com.jspsmart.upload.File myFile = mySmartUpload.getFiles()
    				.getFile(0);
    		if (myFile.isMissing()) {
    %>
    <SCRIPT language=javascript>
    	alert("请先选择要上传的文件");
    	window.location = 'upfile.jsp';
    </script>
    <%
    	} else {
    			//String myFileName=myFile.getFileName(); //取得上载的文件的文件名
    			ext = myFile.getFileExt(); //取得后缀名
    			
    			int file_size = myFile.getSize(); //取得文件的大小
    			String saveurl = "";
    			if (file_size < file_size_max) {
    				
    				//更改文件名，取得当前上传时间的毫秒数值
    				Calendar calendar = Calendar.getInstance();
    				String filename = String.valueOf(calendar
    						.getTimeInMillis());
    						
    				saveurl = request.getRealPath("/") + url;
    				saveurl += filename + "." + ext; //保存路径
    				
    				myFile.saveAs(saveurl, mySmartUpload.SAVE_PHYSICAL);
    				
    			} else {
    				out.print("<SCRIPT language=''javascript''>");
    				out.print("alert(''上传文件大小不能超过" + (file_size_max / 1000)
    						+ "K'');");
    				out.print("window.location=''upfile.jsp;''");
    				out.print("</SCRIPT>");
    			}
    		} 
    	} catch (Exception e) {
    		e.toString();
    	}
    %>

![Center][]  
![Center][]

## 操作结果：    ##

![Center 1][]

[Center]: /images/20220714/a26ec277887348fc99ea6a3357b71f85.png
[Center 1]: /images/20220714/9deb19b4cf5d4721966d1de56d51e68d.png