生成導出文件步驟

1. jsp頁面使用window.location = url+"?"+params;來請求導出api

2.在後臺方法中，設置導出名與內容與文件名編碼格式

 response.setContentType("application/octet-stream");
  response.setCharacterEncoding("GBK");
  try {
   response.setHeader("Content-disposition", "attachment; filename=" + URLEncoder.encode("XXX.csv", "UTF-8"));
  } catch (UnsupportedEncodingException e) {
   logger.error("encode not support, Message: {}", e.getMessage());
  }

String header = "XXX,XXX,XXX";

3.一行行寫

PrintWriter writer;

try {

   writer = response.getWriter();
   writer.println(header);
   for (Crime crime : results) {
       String line = String.format("%s,%s,%s", XXX, XXX, XXX,);
       writer.println(line);
      }
       writer.flush();
       writer.close();
  } catch (IOException e) {
   logger.error("Generate CSV, Message: {}", e.getMessage());
  }