자바 가 POI 를 이용 하여 데이터 의 엑셀 내 보 내기

package com.y9zb.web.util;

import com.y9zb.core.SplitSet;
import com.y9zb.core.TimeUtil;
import org.apache.poi.hssf.usermodel.*;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.servlet.http.HttpServletResponse;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.lang.reflect.Field;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map.Entry;


/**  *   Excel  * @author Guang  *  */ public class PoiExcelUtil {

    private static final Logger logger =LoggerFactory.getLogger(PoiExcelUtil.class);

    /**  *   Excel  * @param excelName     excel    * @param list           * @param fieldMap        Map,     excel    * @param response   response          * @return  */  public static <T> Boolean export(String excelName,List<T> list,LinkedHashMap<String, String> fieldMap,HttpServletResponse response){

        //             ：      
        if (excelName==null || excelName=="") {
            excelName = TimeUtil.getNoFormatToday()+TimeUtil.getNoFormatTime();
        }
        //   response   
        response.reset();
        response.setContentType("application/vnd.ms-excel"); //     excel  
        try {
            response.setHeader("Content-disposition", "attachment; filename="
                    +new String((excelName+"_"+TimeUtil.getNoFormatToday()+TimeUtil.getNoFormatTime()).getBytes("gb2312"), "ISO-8859-1")  + ".xls");
        } catch (UnsupportedEncodingException e1) {
            logger.info(e1.getMessage());
            return false;
        }

        try {
            //    WorkBook,    Excel  
            HSSFWorkbook wb=new HSSFWorkbook();
            List<List<T>> lists= SplitSet.split(list, 30000);
            for (int j = 0; j < lists.size(); j++) {
                // Workbook ，    sheet，  Excel     （sheet）
                HSSFSheet sheet=wb.createSheet(excelName+"_"+(j+1));
                //         
                sheet.setDefaultColumnWidth(18);
                //     ，             
                HSSFCellStyle style=wb.createCellStyle();
                //        
                style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
                //      
                fillSheet(sheet,lists.get(j),fieldMap,style);
            }


            //     
            OutputStream ouputStream = response.getOutputStream();
            wb.write(ouputStream);
            ouputStream.flush();
            ouputStream.close();
        } catch (Exception e) {
            logger.info("  Excel  ！");
            logger.error(e.getMessage());
            return false;
        }
        return true;
    }

    /**  *              *  * @param fieldName  *      * @param clazz  *          * @return     */  public static Field getFieldByName(String fieldName, Class<?> clazz) {
        logger.info("           :getFieldByName()");
        //          
        Field[] selfFields = clazz.getDeclaredFields();

        //           ，   
        for (Field field : selfFields) {
            //          ，   
            if (field.getName().equals(fieldName)) {
                return field;
            }
        }

        //   ，            ，      
        Class<?> superClazz = clazz.getSuperclass();
        if (superClazz != null && superClazz != Object.class) {
            //  
            return getFieldByName(fieldName, superClazz);
        }

        //           ，    
        return null;
    }

    /**  *             *  * @param fieldName      * @param o     * @return      * @throws Exception     *  */  public static Object getFieldValueByName(String fieldName, Object o)
            throws Exception {

        logger.info("          :getFieldValueByName()");
        Object value = null;
        //           
        Field field = getFieldByName(fieldName, o.getClass());

        //       ，        
        if (field != null) {
            field.setAccessible(true);//        private,         ，        
            value = field.get(o);//         Field value
        } else {
            throw new Exception(o.getClass().getSimpleName() + "        "
                    + fieldName);
        }

        return value;
    }

    /**  *                    ,        ，  *  userName ，          ， student.department.name   *  * @param fieldNameSequence                * @param o     * @return      * @throws Exception     *  */  public static Object getFieldValueByNameSequence(String fieldNameSequence,
                                                     Object o) throws Exception {
        logger.info("                   ,        :getFieldValueByNameSequence()");
        Object value = null;

        //  fieldNameSequence    
        String[] attributes = fieldNameSequence.split("\\.");
        if (attributes.length == 1) {
            value = getFieldValueByName(fieldNameSequence, o);
        } else {
            //                      ， student.department.name
            Object fieldObj = getFieldValueByName(attributes[0], o);
            //              
            String subFieldNameSequence = fieldNameSequence
                    .substring(fieldNameSequence.indexOf(".") + 1);
            //             
            value = getFieldValueByNameSequence(subFieldNameSequence, fieldObj);
        }
        return value;

    }

    /**  *            *  * @param sheet  * excel        * @param list  *      * @param fieldMap  *           Map  * @param style  *         * @throws Exception  *     *  */  public static <T> void fillSheet(HSSFSheet sheet, List<T> list,
                                     LinkedHashMap<String, String> fieldMap,HSSFCellStyle style) throws Exception {
        logger.info("         :fillSheet()");
        //                   
        String[] enFields = new String[fieldMap.size()];
        String[] cnFields = new String[fieldMap.size()];

        //     
        int count = 0;
        for (Entry<String, String> entry : fieldMap.entrySet()) {
            enFields[count] = entry.getKey();
            cnFields[count] = entry.getValue();
            count++;
        }

        // sheet      0 ,     poi Excel        short
        HSSFRow row=sheet.createRow((int)0);

        //     
        for (int i = 0; i < cnFields.length; i++) {
            HSSFCell cell=row.createCell(i);
            cell.setCellValue(cnFields[i]);
            cell.setCellStyle(style);
           // sheet.autoSizeColumn(i);
        }

        //     
        for (int index = 0; index < list.size(); index++) {
            row = sheet.createRow(index + 1);
            //       
            T item = list.get(index);
            for (int i = 0; i < enFields.length; i++) {
                Object objValue = getFieldValueByNameSequence(enFields[i], item);
                String fieldValue = objValue == null ? "" : objValue.toString();

                row.createCell(i).setCellValue(fieldValue);
            }
        }
    }

}

@RequestMapping(value = "query/excel/write")
public
@ResponseBody
HttpJsonResult<Boolean> queryExcel(HttpServletRequest request,
                                   HttpServletResponse response, Map<String, Object> dataMap, String q_memberId, String q_memberName,
                                   String q_memberPhone, String q_endTime, String q_startTime, String q_status) throws IOException {
    HttpJsonResult<Boolean> jsonResult = new HttpJsonResult<Boolean>();
    //queryMap--    
    Map<String, String> queryMap = new HashMap<String, String>();
    queryMap.put("q_memberId", q_memberId);
    queryMap.put("q_memberName", q_memberName);
    queryMap.put("q_memberPhone", q_memberPhone);
    queryMap.put("q_startTime", q_startTime);
    queryMap.put("q_endTime", q_endTime);
    queryMap.put("q_status", q_status);
    queryMap.put("q_exportStatus", "0");
    //count---           
    Integer count = pickingCardService.count(queryMap);
    //index---    
    int index = 0;
    if (count % 10000 == 0) {
        index = count / 10000;
    } else {
        index = count / 10000 + 1;
    }
    List<PickingCard> pickingCardList = new ArrayList<>();
    for (int i = 0; i < index; i++) {
        PagerInfo pager = new PagerInfo();
        pager.setPageIndex(i + 1);
        pager.setPageSize(10000);
        pager.setRowsCount(count);
        ServiceResult<List<PickingCard>> serviceResult = pickingCardService.page(queryMap, pager);
        pickingCardList.addAll(serviceResult.getResult());
    }
    //    excel   
    String excelName = "        ";
    //        excle   map  
    LinkedHashMap<String, String> fieldMap = new LinkedHashMap<String, String>();
    fieldMap.put("memberId", "  ID");
    fieldMap.put("memberName", "   ");
    fieldMap.put("memberPhone", "   ");
    fieldMap.put("createTimeString", "    ");
    fieldMap.put("statusString", "    ");

    for (int i = 0; i < pickingCardList.size(); i++) {
        pickingCardList.get(i).setExportStatus(1);
        pickingCardList.get(i).setCreateTimeString(TimeUtil.getDateTimeString(pickingCardList.get(i).getCreateTime()));
        if (pickingCardList.get(i).getStatus() == 0) {
            pickingCardList.get(i).setStatusString("   ");
        } else {
            pickingCardList.get(i).setStatusString("  ");
        }
    }
    //  
    Boolean is = PoiExcelUtil.export(excelName, pickingCardList, fieldMap, response);
    if (is) {
        jsonResult.setRows(true);
        jsonResult.setMessage("    ");
        pickingCardService.updateBatch(pickingCardList);
    } else {
        jsonResult.setRows(false);
        jsonResult.setMessage("    ");
    }
    return jsonResult;
}