java生成并下载TXT文件

List ml = db.queryMapList2(m_strLoginCityID, sql);

//路径
   String src = request.getRealPath("log") + "\\text.txt ";
   if (ml != null) {
    File f = new File(src);
    BufferedWriter bw = null;
    bw = new BufferedWriter(new FileWriter(f));
    for (int j = 0; j < ml.size(); j++) {
   Map row = (Map) ml.get(j);

//写入文件
   bw.write((String) row.get("name") + "\r\n");
    }
    bw.flush();
    bw.close();
   }

 

//下载打开文件

   String filePath = src;
   String fileName = "测试文件";

   boolean isInline = false;
   out.clear();
   response.reset();

   fileName = "测试文件" + ".txt";
   java.io.File f = new java.io.File(filePath);
   response.setContentType("application/x-download");
   response.setHeader("Content-Disposition",
   "attachment;filename="
     + java.net.URLEncoder.encode(fileName, "UTF8"));
   response.setContentLength((int) f.length()); //  设置下载内容大小 
   if (fileName != null && filePath != null) {
    try {
   if (f.exists() && f.canRead()) {
    String mimetype = null;
    byte[] buffer = new byte[4096]; //  缓冲区
    BufferedOutputStream output = null;
    BufferedInputStream input = null;
    try {
     output = new BufferedOutputStream(response
     .getOutputStream());
     input = new BufferedInputStream(
     new FileInputStream(f));

     int n = (-1);
     while ((n = input.read(buffer, 0, 4096)) > -1) {
    output.write(buffer, 0, n);
     }
     response.flushBuffer();
    } catch (Exception e) {
    } //  用户可能取消了下载
    finally {
     if (input != null)
    input.close();
     if (output != null)
    output.close();
    }

   }
   return;
    } catch (Exception ex) {
   ex.printStackTrace();
    }

   }