Html 在同一页面中显示成功消息

我只想在同一页中显示我的成功消息。我如何在同一页中显示成功消息。当我尝试时，它被转到另一页。你能帮我编辑数据吗

            <%@ page import="java.io.*"%>
       <%      String saveFile = "";   
         String contentType = request.getContentType();  
            if ((contentType != null) && (contentType.indexOf 
          ("multipart/form-data") >= 0))                {        
DataInputStream in = new DataInputStream(request.getInputStream());     
int formDataLength = request.getContentLength();        
byte dataBytes[] = new byte[formDataLength];       
int byteRead = 0;        
int totalBytesRead = 0;       
while (totalBytesRead < formDataLength) {       
byteRead = in.read(dataBytes, totalBytesRead, formDataLength);            
totalBytesRead += byteRead;           
}           
String file = new String(dataBytes);        
saveFile = file.substring(file.indexOf("filename=\"") + 10);       
saveFile = saveFile.substring(0, saveFile.indexOf("\n"));           
saveFile = saveFile.substring(saveFile.lastIndexOf("\\") + 1,  
       saveFile.indexOf("\""));       
int lastIndex = contentType.lastIndexOf("=");           
String boundary = contentType.substring(lastIndex + 1, contentType.length());          
int pos;           
pos = file.indexOf("filename=\"");           
pos = file.indexOf("\n", pos) + 1;         
pos = file.indexOf("\n", pos) + 1;          
pos = file.indexOf("\n", pos) + 1;          
int boundaryLocation = file.indexOf(boundary, pos) - 4;     
int startPos = ((file.substring(0, pos)).getBytes()).length;          
int endPos = ((file.substring(0, boundaryLocation)).getBytes()).length;          
saveFile = "D:/CETAF/Configuration Repository/Configuration/" + saveFile;         
File ff = new File(saveFile);          
FileOutputStream fileOut = new FileOutputStream(ff);          
fileOut.write(dataBytes, startPos, (endPos - startPos));           
fileOut.flush();            
fileOut.close();%><Br><table border="2">
           <tr>         
     <td><b>You have successfully upload the file by the name of:</b>         
        <%                  
        out.println(saveFile);                 
        }        
          %>          
         </td>      
          </tr>
         </table>

= 0))                {        
DataInputStream in=新的DataInputStream（request.getInputStream（））；
int formDataLength=request.getContentLength（）；
字节数据字节[]=新字节[formDataLength]；
int byteRead=0；
int totalBytesRead=0；
而（totalBytesRead

您已通过以下名称成功上载文件：

在此处保存一个会话变量，称为“success”，将其命名为此操作特定的内容，重定向回上一页，在此处读取会话变量并显示成功消息，然后将该会话变量设置回null