一个方法中多种不同返回结果形式

finally {
if (StringUtils.isEmpty(error)) {
try {
int times = record.getGrDownTimes() + 1;
generateRecordService.updDownTimes(id, times);
} catch (Exception e) {
}
response.setContentType("text/plain;charset=utf-8");
response.setHeader("Content-Disposition", "attachment;filename="  + id + type + ".txt");
response.getOutputStream().write(FileUtils.readFileToByteArray(writename));
response.getOutputStream().flush();
response.getOutputStream().close();
}  else {
response.setContentType("application/json;charset=utf-8");
response.getWriter()
.write("    " + error);
response.getWriter().flush();
response.getWriter().close();
}
}