springMVC导出 CSV案例

导出csv

第一步 Controller类里调用

OrderParamsVo 传入的参数

orderService.findBuyCSV 查询到要导出的信息

      /**
      * 购买订单CSV
      * OrderParamsVo 传入的参数
      */
     @RequestMapping("findBuyCSV")
     @ResponseBody
     public JsonResult findBuyCSV(OrderParamsVo params, HttpServletResponse response) {
         List<Map<String, Object>> dataList=null；
         Validator.getInstance().validate(params);
         List<OrderBo> orderBos = orderService.findBuyCSV(params);// 查询到要导出的信息
         if (orderBos.size() == 0) {
             JsonResult.buildFailedResult("无数据导出");
         }
         String sTitle = "投资日期,订单号,姓名,购买产品,金额,状态";
         String fName = "buywater_";
         String mapKey = "createDate,no,realname,productName,money,state";
         dataList = new ArrayList<>();
         Map<String, Object> map = null;
         for (OrderBo order : orderBos) {
             map = new HashMap<String, Object>();
             map.put("createDate", DateFormatUtils.format(order.getCreateDate(), "yyyy/MM/dd HH:mm"));
             map.put("no", order.getNo());
             map.put("realname", order.getUserName());
             map.put("productName", order.getProductName());
             map.put("money", order.getMoney());
             map.put("state", order.getState());

             dataList.add(map);
         }
         try (final OutputStream os = response.getOutputStream()) {
             ExportUtil.responseSetProperties(fName, response);
             ExportUtil.doExport(dataList, sTitle, mapKey, os);
             return null;

         } catch (Exception e) {
             logger.error("购买CSV失败", e);

         }
         return JsonResult.buildFailedResult("数据导出出错");
     }            

第二步：ExportUtil 类 （公用方法） 关键

 package com.util;

 import java.io.OutputStream;
 import java.io.UnsupportedEncodingException;
 import java.net.URLEncoder;
 import java.text.SimpleDateFormat;
 import java.util.Date;
 import java.util.List;
 import java.util.Map;

 import javax.servlet.http.HttpServletResponse;

 import org.apache.commons.lang3.time.DateFormatUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;

 public class ExportUtil {
     private static final Logger logger = LoggerFactory.getLogger(ExportUtil.class);
     /** CSV文件列分隔符 */
     private static final String CSV_COLUMN_SEPARATOR = ",";

     /** CSV文件列分隔符 */
     private static final String CSV_RN = "\r\n";

     /**
      *
      * @param dataList 集合数据
      * @param colNames 表头部数据
      * @param mapKey 查找的对应数据
      * @param response 返回结果
      */
     public static boolean doExport(List<Map<String, Object>> dataList, String colNames, String mapKey, OutputStream os) {
         try {
             StringBuffer buf = new StringBuffer();

             String[] colNamesArr = null;
             String[] mapKeyArr = null;

             colNamesArr = colNames.split(",");
             mapKeyArr = mapKey.split(",");

             // 完成数据csv文件的封装
             // 输出列头
             for (int i = 0; i < colNamesArr.length; i++) {
                 buf.append(colNamesArr[i]).append(CSV_COLUMN_SEPARATOR);
             }
             buf.append(CSV_RN);

             if (null != dataList) { // 输出数据
                 for (int i = 0; i < dataList.size(); i++) {
                     for (int j = 0; j < mapKeyArr.length; j++) {
                         buf.append(dataList.get(i).get(mapKeyArr[j])).append(CSV_COLUMN_SEPARATOR);
                     }
                     buf.append(CSV_RN);
                 }
             }
             // 写出响应
             os.write(buf.toString().getBytes("GBK"));
             os.flush();
             return true;
         } catch (Exception e) {
             logger.error("doExport错误...", e);
         }
         return false;
     }

     /**
      * @throws UnsupportedEncodingException
      *
      *             setHeader
      */
     public static void responseSetProperties(String fileName, HttpServletResponse response) throws UnsupportedEncodingException {
         // 设置文件后缀
         SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmss");
         String fn = fileName + sdf.format(new Date()).toString() + ".csv";
         // 读取字符编码
         String utf = "UTF-8";

         // 设置响应
         response.setContentType("application/ms-txt.numberformat:@");
         response.setCharacterEncoding(utf);
         response.setHeader("Pragma", "public");
         response.setHeader("Cache-Control", "max-age=30");
         response.setHeader("Content-Disposition", "attachment; filename=" + URLEncoder.encode(fn, utf));
     }

 }

导出csv 搞定 。 有问题欢迎提问

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