jsp实现文件下载与中文文件名乱码问题解决

可以解决下载文件乱码问题(诸如:DOC,XSL文件等等).
后来发现,遇到中文名的文件的时候,文件下载将会报错~~~~
今天,通过改写原Download.jsp文件已经彻底解决了这个问题~
现在,把一整套的文件上传下载的方法给贴出来~~~以便大家借鉴!~!~!~!~! 
作者:古埃及法老

download.jsp文件
---------------------------------------------------------
<%
  java.io.BufferedInputStream bis=null;
  java.io.BufferedOutputStream  bos=null;
try{
 String filename=request.getParameter("filename");
             filename=new String(filename.getBytes("iso8859-1"),"gb2312");
 response.setContentType("application/x-msdownload");
 response.setHeader("Content-disposition","attachment; filename="+new String(filename.getBytes("gb2312"),"iso8859-1"));
 bis =new java.io.BufferedInputStream(new java.io.FileInputStream(config.getServletContext().getRealPath("files/" + filename)));
 bos=new java.io.BufferedOutputStream(response.getOutputStream()); 
 byte[] buff = new byte[2048];
 int bytesRead;
 while(-1 != (bytesRead = bis.read(buff, 0, buff.length))) {
  bos.write(buff,0,bytesRead);
 }
}
catch(Exception e){
 e.printStackTrace();
}
finally {
 if (bis != null)bis.close();
 if (bos != null)bos.close();
}
%> 


注意，关键就是setHeader里的filename需要重新编码,格式是ISO-8859-1就ＯＫ了

以下是我自己项目中用到的代码片断，供参考:

list.jsp: 显示附件名称的页面
<tr>
            <td height="25" class="tdcor">附&nbsp;&nbsp;件&nbsp;</td>
            <td colspan="3" height=50>
                <%
                    if (null != publish.getAttatchFilename() &&
publish.getAttatchFilename().length() > 0) {
                %>
                <a href="publish_do.jsp?method=download&fileName=
<%=URLEncoder.encode(publish.getAttatchFilename(),"GBK")%>">
<%=URLDecoder.decode(publish.getAttatchFilename(),"GBK")%></a>
                <%
                    }
                %>
            </td>
</tr>

download.jsp:下载页面
else if (null != method && method.equals("download")) {//下载附件

        String fileName = request.getParameter("fileName");
        File file = new File(Constants.PUBLISH_FILE_PATH + "/" + URLDecoder.decode(fileName,"GBK"));
        response.reset();
        response.setContentType("application/octet-stream; charset=GBK");
        response.addHeader("Content-Disposition", "attachment; filename=" + CourseDetailBusiness.transfer(URLDecoder.decode(fileName,"GBK"),"GBK","ISO-8859-1"));
        response.setContentLength((int) file.length());

        byte[] buffer = new byte[4096];
        BufferedOutputStream output = null;
        BufferedInputStream input = null;

        // 写缓冲区：
        try {
            output = new BufferedOutputStream(response.getOutputStream());
            input = new BufferedInputStream(new FileInputStream(file));

            int n = (-1);
            while ((n = input.read(buffer, 0, 4096)) > -1) {
                output.write(buffer, 0, n);
            }
            response.flushBuffer();
        }
        catch (Exception e) {
        } // maybe user cancelled download
        finally {
            if (input != null) input.close();
            if (output != null) output.close();
        }


说明:
１。文件名在数据库中保存的编码为URLEncode
2.在list.jsp显示的时候多了一次encode,不知为什么，不encode一次还不行，实际上是第二次编码了