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jspsmartupload 下载实现

 

down.html代码如下:原理就是通过超链接到一个jsp,通过jsp调用下载的代码



<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
    
<head>
        
<title>文件上传</title>
        
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
    
</head>
    
<body>
        
<align="center">
            上传文件选择
        
</p>
        
<FORM METHOD="POST" ACTION="up.jsp" ENCTYPE="multipart/form-data">
            
<input type="hidden" name="TEST" value="good">
            
<table width="75%" border="1" align="center">
                
<tr>
                    
<td>
                        
<div align="center">
                            1、
                            
<input type="FILE" name="FILE1" size="30">
                        
</div>
                    
</td>
                
</tr>
                
<tr>
                    
<td>
                        
<div align="center">
                            2、
                            
<input type="FILE" name="FILE2" size="30">
                        
</div>
                    
</td>
                
</tr>
                
<tr>
                    
<td>
                        
<div align="center">
                            3、
                            
<input type="FILE" name="FILE3" size="30">
                        
</div>
                    
</td>
                
</tr>
                
<tr>
                    
<td>
                        
<div align="center">
                            4、
                            
<input type="FILE" name="FILE4" size="30">
                        
</div>
                    
</td>
                
</tr>
                
<tr>
                    
<td>
                        
<div align="center">
                            
<input type="submit" name="Submit" value="上传它!">
                        
</div>
                    
</td>
                
</tr>
            
</table>
            
<br>
            
<br>
            
<href="down.jsp" >点击下载</a>
        
</FORM>
    
</body>
</html>

down.jsp

 



<%@page contentType="text/html; charset=gb2312" language="java" import="java.util.*,com.jspsmart.upload.*,java.lang.*" errorPage="" %>

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

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

  
</head>
  
  
<body>
        
<%SmartUpload su=new SmartUpload();
                su.initialize(pageContext);
                su.setContentDisposition(
null);//是否自动打开,null为不自动打开
                su.downloadFile(
"c:jh.cer");
                out.clear(); 
                out 
= pageContext.pushBody();                         
            
%>        
  
</body>
</html>

值得主义的是:再<%%>里的后两句

out.clear();
out = pageContext.pushBody();
一定要加上,不然在有些时候会报异常:getOutputStream() has already been called for this response

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补充:Jsp教程,Java技巧及代码
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