无法下载的问题，求解

Question

我在用servlet写了一个下载功能，先把文件打包成RAR，然后通过SERVLET下载，但遇到了无法下载的问题。

出现问题的截图：

代码是：

public void exportDown(HttpRequest request, HttpServletResponse response,
            User user) throws ServletException, IOException {
        ExportLogApp app = new ExportLogApp(
                "from Test1 where 1=1 and id <1001 ");
        int i = app.exportDownRAR(user.getId(), null, null);
        if (i == app.LOG) {
            user.addLog("数据交换", "导出下载数据", "用户[" + user.getId() + "]导出数据成功！");
            String filePath = app.getRARpath_save() + File.separator
                    + app.getRARname_save() + ".rar";
            filePath = filePath.replaceAll("/", "\\\\");
            // 定义输出类型(下载)
            response.setContentType("application/force-download");
            // 定义输出文件头
            response.setHeader("Content-Disposition", "attachment;filename=\""
                    + app.getRARname_save() + ".rar\"");

            File file = new File(filePath);
            int len = (int) file.length();

            byte[] buf = new byte[len];
            FileInputStream fis = new FileInputStream(file);
            OutputStream out = response.getOutputStream();
            len = fis.read(buf);
            out.write(buf, 0, len);
            out.flush();
            out.close();
            fis.close();
            file.delete();

        } else if (i == app.LOG_ERROR) {
            user.addLog("数据交换", "导出下载数据", "用户[" + user.getId() + "]导出数据失败！");
            PrintWriter out = response.getWriter();
            out.println("<script language='javascript'>");
            out.println("alert('导出数据出错，请联系管理员！');");
            out.println("window.location.href='../expert/expert_account.jsp';");
            out.println("window.close()");
            out.println("</script>");
        } else if (i == app.NO_DATA) {

        }
    }

 请帮我解答下，为什么会这样，我测试用的浏览器是IE7.
 

Answer 1

1,导出之前加response.reset().
2,导出之后 加return;试试。