jsp+servlet 客户端文件保存/下载问题！

写一个下载的程序就可以了
http://www.csdn.net/develop/read_article.asp?id=19064

用servlet实现最好，除了对资源可控之外，也能更好处理客户信息

用servlet可以实现，但现在不能下载中文文件，当下载中文文件时，出现
java.io.FileNotFoundException: ..\file_share\%B9%D8%B1%D5%CA%B1%D7%E0%BB%C3%CF%EB%BF%............错误信息。请帮忙看看！！谢谢
得到文件路径和文件名称后，通过system.out.println在servlet中打印中文字符正常，
之后
response.setContentType("application/binary; charset=ISO8859_1");
String fileName = request.getAttribute("fileName").toString();
fileName = new String(fileName.getBytes("ISO8859_1"),"GB2312");
System.out.println("new file = " + fileName);//正常
fileName = URLEncoder.encode(fileName);
但
File file = new File("..//file_share//" + fileName);
new BufferedInputStream(new FileInputStream(file)); //但在这里就报上面的异常

File file = new File("..//file_share//" + fileName);
new BufferedInputStream(new FileInputStream(file)); //但在这里就报上面的异常路径错了，斜杠应该反过来写。如果在windows系统中

用servlet:
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;
import java.net.URLEncoder;
import java.net.MalformedURLException;public class DownloadServlet extends HttpServlet
{
    private static final String CONTENT_TYPE = "text/html; charset=GBK";
    //这里填入服务器的url
    private String serverUrl = "";
    //Initialize global variables
    public void init() throws ServletException
    {
    }    //Process the HTTP Get request
    public void doGet(HttpServletRequest request,
                      HttpServletResponse response) throws ServletException, IOException
    {
        /////////////////////////////////////////////
        if(request.getAttribute("checkMimeType") == null || !"true".equals(request.getAttribute("checkMimeType").toString()))
        {
            java.util.Enumeration enum = request.getHeaderNames();
            //如果不是从网站过以的连接，不允许下载
            if(request.getHeader("referer") == null ||
               ( (String) request.getHeader("referer")).trim().indexOf(serverUrl) < 0)
            {
                response.setContentType("text/html;charset=GB2312");
                PrintWriter out = response.getWriter();
                out.println("<html>");
                out.println("<head>");
                out.println("<title></title>");
                out.println("<meta http-equiv=\"content-type\" content=\"text/html; charset=GB2312\">");
                out.println("</head>");
                out.println("<body>");
                out.println("您无权下载该文件！");
                out.println("</body>");
                out.println("</html>");
                return;
            }
        }        String fileName = request.getAttribute("fileName").toString();
//        fileName = URLEncoder.encode(fileName);
        ServletOutputStream out = response.getOutputStream();
        //如果需要根据文件指定MimeType
        if(request.getAttribute("checkMimeType") != null && "true".equals(request.getAttribute("checkMimeType").toString()))
        {
            if(fileName.toLowerCase().indexOf(".jpg") > 0 || fileName.toLowerCase().indexOf(".jpeg") > 0)
            {
                response.setContentType("image/jpeg; charset=ISO8859_1");
            }
            else if(fileName.toLowerCase().indexOf(".gif") > 0)
            {
                response.setContentType("image/gif; charset=ISO8859_1");
            }
            else if(fileName.toLowerCase().indexOf(".bmp") > 0)
            {
                response.setContentType("image/bmp; charset=ISO8859_1");
            }
            else if(fileName.toLowerCase().indexOf(".ico") > 0)
            {
                response.setContentType("image/x-icon; charset=ISO8859_1");
            }
            else if(fileName.toLowerCase().indexOf(".png") > 0)
            {
                response.setContentType("image/png; charset=ISO8859_1");
            }
            else
            {
                response.setContentType("application/binary; charset=ISO8859_1");
            }
        }
        else
        {
            response.setContentType("application/binary; charset=ISO8859_1");
        }
        fileName = new String(fileName.getBytes("GB2312"),"ISO8859_1"); //add by dl
        System.out.println("IE " + fileName);
        response.setHeader("Content-disposition", "attachment; filename=" + fileName);        BufferedInputStream bis = null;
        BufferedOutputStream bos = null;
        String fileUrl = request.getAttribute("fileUrl").toString();
        System.out.println("--------debug: " + fileUrl);
        try
        {
            File file = new File(fileUrl);
            bis = new BufferedInputStream(new FileInputStream(file));
            bos = new BufferedOutputStream(out);            byte[] buff = new byte[2048];
            int bytesRead;
            while( -1 != (bytesRead = bis.read(buff, 0, buff.length)))
            {
                bos.write(buff, 0, bytesRead);
            }
            bos.flush();
            bos.close();
            bis.close();
            out.close();
            out = null;
            bis = null;
            bos = null;
            buff = null;
        }
        catch(MalformedURLException e)
        {
            System.out.println("下载文件时发生了MalformedURLExceptin错误" + e.toString());
            throw e;
        }
        catch(IOException e)
        {
            System.out.println("下载文件时发生了IOException错误" + e.toString());
            throw e;
        }
        catch(Exception e)
        {
            System.out.println("下载文件时发生错误" + e.toString());
        }
        finally
        {
            if(bis != null)
            {
                bis.close();
            }
            if(bos != null)
            {
                bos.close();
            }
        }    }    //Process the HTTP Post request
    public void doPost(HttpServletRequest request,
                       HttpServletResponse response) throws ServletException, IOException
    {
        doGet(request, response);
    }    //Clean up resources
    public void destroy()
    {
    }
}

调试易

jsp+servlet 客户端文件保存/下载问题！

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