一个关于文件下载的问题(100分)

  response.setContentType("application/pdf");
  response.setHeader("Content-Location", "report.pdf");
  response.setHeader("Content-Disposition", "filename=report.pdf");
  response.setContentLength(bytes.length);
  // 上面几句是你要的 后面的三句不一定要有 但有了比较保险
  ServletOutputStream ouputStream = response.getOutputStream();
  ouputStream.write(bytes, 0, bytes.length);
  ouputStream.flush();
  ouputStream.close();