springMVC導出 CSV案例

導出csv

第一步 Controller類里調用

OrderParamsVo 傳入的參數

orderService.findBuyCSV 查詢到要導出的信息

     /**
     * 購買訂單CSV
     * OrderParamsVo 傳入的參數
     */
    @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);// 查詢到要導出的信息
        if (orderBos.size() == 0) {
            JsonResult.buildFailedResult("無數據導出");
        }
        String sTitle = "投資日期,訂單號,姓名,購買產品,金額,狀態";
        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("購買CSV失敗", e);

        }
        return JsonResult.buildFailedResult("數據導出出錯");
    }            

 

第二步：ExportUtil 類 （公用方法） 關鍵

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 集合數據
     * @param colNames 表頭部數據
     * @param mapKey 查找的對應數據
     * @param response 返回結果
     */
    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(",");

            // 完成數據csv文件的封裝
            // 輸出列頭
            for (int i = 0; i < colNamesArr.length; i++) {
                buf.append(colNamesArr[i]).append(CSV_COLUMN_SEPARATOR);
            }
            buf.append(CSV_RN);

            if (null != dataList) { // 輸出數據
                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);
                }
            }
            // 寫出響應
            os.write(buf.toString().getBytes("GBK"));
            os.flush();
            return true;
        } catch (Exception e) {
            logger.error("doExport錯誤...", e);
        }
        return false;
    }

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

        // 設置響應
        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));
    }

}

 

導出csv 搞定 。 有問題歡迎提問

偶遇晨光原創