問題：
??????直接用URLEncoder.encode(fileName,"UTF-8")，得到的文件名長度會被截斷。
解決方法是：
??????文件名先用“GB2312”編碼，然后用“
ISO8859_1”解碼。當然也可以在將文件名保存到數據庫之前用“GB2312”編碼。
代碼如下：
?1
conn?=?DBUtil.getConnection();
?2????????????ps?=?conn.prepareStatement("SELECT?FILE_NAME,?CONTENT_TYPE,?CONTENT?FROM?PUB_JOB_ATTACHMENTS?WHERE?ATTACHID?=??");
?3????????????ps.setString(1,getAttachId());
?4????????????rs?=?ps.executeQuery();
?5????????????if(rs.next())
?6
????????????
{
?7
????????????????//java.net.URLEncoder.encode(rs.getString("FILE_NAME"),?"UTF-8")
?8????????????????response.setContentType(rs.getString("CONTENT_TYPE"));
?9????????????????String?fileName=rs.getString("FILE_NAME");
10????????????????fileName=URLEncoder.encode(fileName,"GB2312");
11????????????????fileName=URLDecoder.decode(fileName,?"ISO8859_1");
12????????????????response.addHeader("Content-Disposition",?"attachment;?filename=\""?+?fileName?+?"\"");
13????????????????Blob?content?=?rs.getBlob("CONTENT");
14????????????????InputStream?ins?=?content.getBinaryStream();
15????????????????byte?buffer[]?=?new?byte[1024];
16????????????????int?length?=?-1;
17????????????????outs?=?response.getOutputStream();
18????????????????while((length?=?ins.read(buffer))?!=?-1)
19????????????????????outs.write(buffer,?0,?length);
20????????????????ins.close();
21????????????????outs.flush();
22
????????????}