1、第一步骤创建springboot项目。1、使用IDEA创建springboot项目。具体可以直接参考：https://jingyan.baidu.com/article/0eb457e5ff3a5c03f1a905ff.html2、使用eclipse创建springboot项目。具体可以直接参考：https://jingyan.baidu.com/article/37bce2beac4a461002f3a2a4.html3、创建普通javaweb项目使用servlet实现请求具体可以直接参考：https://jingyan.baidu.com/article/ff411625048acf12e482373a.html或者百度搜索：servlet类如何映射到url路径 百度经验
2、第二步骤：代码实现。import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.RestController;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import java.io.PrintWriter;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;@RestControllerpublic class CSVController { @GetMapping("/exportCsv") public void exportCsv(HttpServletRequest request, HttpServletResponse response) { try { List<Map> oneWinnerList = new ArrayList<Map>(); for (int i = 0; i < 100000; i++) { Map map = new HashMap(); map.put("winnerId", "winnerId(请勿修改)"); map.put("orderDetailId", "订单号"); map.put("title", "商品标题"); map.put("goodsId", "商品Id"); map.put("periods", "期数"); map.put("userId", "用户Id"); map.put("userName", "用户"); map.put("statusDetail", "订单状态"); map.put("addressee", "收货人"); map.put("phone", "收货电话"); map.put("address", "收货地址"); map.put("expressCompany", "快递名称"); map.put("expressOrde", "快递单号"); oneWinnerList.add(map); } response.reset(); response.setContentType("application/csv;charset=UTF-8"); response.setHeader("Content-Disposition", "attachment;filename=orderData " + System.currentTimeMillis() + ".csv"); response.setCharacterEncoding("UTF-8"); PrintWriter out = response.getWriter(); out.println("winnerId(请勿修改),订单号,商品标题,商品Id,期数,用户Id,用户,订单状态,收货人,收货电话,收货地址,快递名称,快递单号"); for (int i = 0, length = oneWinnerList.size(); i < length; i++) { Map onewinner = oneWinnerList.get(i); String str = onewinner.get("winnerId") + "," + onewinner.get("orderDetailId") + "," + onewinner.get("title") + "," + onewinner.get("goodsId") + "," + onewinner.get("periods") + "," + onewinner.get("userId") + "," + onewinner.get("userName") + "," + onewinner.get("statusDetail") + "," + onewinner.get("addressee") + "," + onewinner.get("phone") + "," + onewinner.get("address") + "," + onewinner.get("expressCompany") + "," + onewinner.get("expressOrde"); str = str.replace("null", ""); out.println(str); } out.flush(); out.close(); } catch (Exception e) { e.printStackTrace(); } }}
3、第三步骤：测试。1、使用浏览器打开页面http://localhost:8080/exportCsv/2、导出文件2.1 文件大小146M
