spring boot 整合 poi 導出excel

一、 第一種方式

1.首先從中央倉庫中導入架包Poi3.14以及Poi-ooxml3.14.
<dependency>
   <groupId>org.apache.poi</groupId>
   <artifactId>poi</artifactId>
   <version>3.17</version>
</dependency>

2.編寫工具類
編寫用於導出Excel的工具類ExportExcelUtils，工具類可以直接使用，不需要更改。

package com.roncoo.education.web.common;

import org.apache.poi.hssf.usermodel.*;

import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.List;

/**
 * @author ZhangRF
 */
public class ExcelUtil {
    /**
     * Excel表格導出
     *
     * @param response    HttpServletResponse對象
     * @param excelData   Excel表格的數據，封裝為List<List<String>>
     * @param sheetName   sheet的名字
     * @param fileName    導出Excel的文件名
     * @param columnWidth Excel表格的寬度，建議為15
     * @throws IOException 拋IO異常
     */
    public static void exportExcel(HttpServletResponse response,
                                   List<List<String>> excelData,
                                   String sheetName,
                                   String fileName,
                                   int columnWidth) throws IOException {

        //聲明一個工作簿
        HSSFWorkbook workbook = new HSSFWorkbook();

        //生成一個表格，設置表格名稱
        HSSFSheet sheet = workbook.createSheet(sheetName);

        //設置表格列寬度
        sheet.setDefaultColumnWidth(columnWidth);

        //寫入List<List<String>>中的數據
        int rowIndex = 0;
        for (List<String> data : excelData) {
            //創建一個row行，然後自增1
            HSSFRow row = sheet.createRow(rowIndex++);

            //遍歷添加本行數據
            for (int i = 0; i < data.size(); i++) {
                //創建一個單元格
                HSSFCell cell = row.createCell(i);

                //創建一個內容對象
                HSSFRichTextString text = new HSSFRichTextString(data.get(i));

                //將內容對象的文字內容寫入到單元格中
                cell.setCellValue(text);
            }
        }

        //準備將Excel的輸出流通過response輸出到頁面下載
        //八進位輸出流
        response.setContentType("application/octet-stream");

        //設置導出Excel的名稱
        response.setHeader("Content-disposition", "attachment;filename=" + java.net.URLEncoder.encode(fileName, "UTF-8"));

        //刷新緩衝
        response.flushBuffer();

        //workbook將Excel寫入到response的輸出流中，供頁面下載該Excel文件
        workbook.write(response.getOutputStream());

        //關閉workbook
        workbook.close();
    }

}

3.service導出實現

public void orderExport(OrderInfoQO orderInfoQO, HttpServletResponse response) {
        orderInfoQO.setPageCurrent(1);
        orderInfoQO.setPageSize(1000);
        Integer courseFlag = orderInfoQO.getCourseFlag();
        CourseFlagEnum courseFlagEnum = CourseFlagEnum.values(courseFlag);
        boolean isGet = true;
        List<List<String>> excelData = new ArrayList<>();
        List<String> head = new ArrayList<>();
        head.add("訂單編號");
        head.add("講師資訊");
        head.add("用戶手機號");
        head.add("用戶姓名");
        if (courseFlagEnum == CourseFlagEnum.YUNXIAOHUI) {
            head.add("機構名稱");
        }
        head.add("課程顧問");
        head.add("課程名稱");
        head.add("課程原價");
        head.add("課程實付");
        head.add("齒幣");
        head.add("交易類型");
        head.add("支付方式");
        head.add("購買渠道");
        head.add("支付時間");
        head.add("客戶備註");
        excelData.add(head);
        do {
            Page<OrderInfoVO> page = feignOrderInfo.listForPage(orderInfoQO);
            if (page.getPageCurrent() == page.getTotalPage()) {
                isGet = false;
            } else {
                orderInfoQO.setPageCurrent(page.getPageCurrent() + 1);
            }
            page.getList().stream().map(m -> {
                UserExtVO userExtVO = feignUserExt.getByUserNo(m.getUserNo());
                List<String> data = new ArrayList<>();
                data.add(String.valueOf(m.getOrderNo()));
                data.add(m.getLecturerName());
                data.add(m.getMobile());
                if (userExtVO != null && userExtVO.getId() != null) {
                    data.add(userExtVO.getRealName());
                    if (courseFlagEnum == CourseFlagEnum.YUNXIAOHUI) {
                        data.add(userExtVO.getOrgName());
                    }
                    data.add(userExtVO.getKefuName());
                } else {
                    data.add("");
                    if (courseFlagEnum == CourseFlagEnum.YUNXIAOHUI) {
                        data.add("");
                    }
                    data.add("");
                }
                data.add(m.getCourseName());
                data.add(String.valueOf(m.getPricePayable()));
                data.add(String.valueOf(m.getPricePaid()));
                data.add(String.valueOf(m.getUsePoint()));
                TradeTypeEnum tradeTypeEnum = TradeTypeEnum.values(m.getTradeType());
                if (tradeTypeEnum == null) {
                    data.add("");
                } else {
                    data.add(tradeTypeEnum.getDesc());
                }
                PayTypeEnum payTypeEnum = PayTypeEnum.values(m.getPayType());
                if (payTypeEnum == null) {
                    data.add("");
                } else {
                    data.add(payTypeEnum.getDesc());
                }
                ChannelTypeEnum channelTypeEnum = ChannelTypeEnum.values(m.getChannelType());
                if (channelTypeEnum == null) {
                    data.add("");
                } else {
                    data.add(channelTypeEnum.getDesc());
                }
                data.add(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(m.getPayTime()));
                data.add(m.getRemarkCus());
                excelData.add(data);
                return m;
            }).collect(Collectors.toList());
        } while (isGet);

        String sheetName = "課程訂單";
        String fileName = "訂單報表-";
        if (courseFlagEnum == CourseFlagEnum.YUNXIAOHUI) {
            fileName = "雲校匯訂單報表";
        }
        fileName = fileName + new SimpleDateFormat("yyyy-MM-dd").format(new Date()) + ".xls";

        try {
            ExcelUtil.exportExcel(response, excelData, sheetName, fileName, 15);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

4.介面調用

/**
     * 報表導出
     *
     * @param response
     * @throws IOException
     */
    @RequestMapping(value = "/export", method = RequestMethod.GET)
    public void orderExport(@ModelAttribute OrderInfoQO orderInfoQO, HttpServletResponse response) throws IOException {
        biz.orderExport(orderInfoQO, response);
    }

 

二、第二種方式

1.首先從中央倉庫中導入架包Poi3.14以及Poi-ooxml3.14.

<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>3.14</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml</artifactId>
<version>3.14</version>
</dependency>

 

2.編寫工具類
編寫用於導出Excel的工具類ExportExcelUtils，工具類可以直接使用，不需要更改。

package org.emall.website.util;

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.Date;
import java.text.SimpleDateFormat;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

/**
* @version v.0.1
* @Description TODO
* @date 2020/6/1
* @備註
**/
public class ExportExcelUtils {
private static final Logger logger = LoggerFactory.getLogger(ExportExcelUtils.class);

/**
* 導出Excel
*
* @param excelName 要導出的excel名稱
* @param list 要導出的數據集合
* @param fieldMap 中英文欄位對應Map，即要導出的excel表頭
* @param response 使用response可以導出到瀏覽器
* @param <T>
*/
public static <T> void export(String excelName, List<T> list, LinkedHashMap<String, String> fieldMap, HttpServletResponse response) {

// 設置默認文件名為當前時間：年月日時分秒
if (excelName == null || excelName == "") {
excelName = new SimpleDateFormat("yyyyMMddhhmmss").format(
new Date()).toString();
}
// 設置response頭資訊
response.reset();
response.setContentType("application/vnd.ms-excel"); // 改成輸出excel文件
try {
response.setHeader("Content-disposition", "attachment; filename="
+ new String(excelName.getBytes("gb2312"), "ISO-8859-1") + ".xls");
} catch (UnsupportedEncodingException e1) {
logger.info(e1.getMessage());
}

try {
//創建一個WorkBook,對應一個Excel文件
HSSFWorkbook wb = new HSSFWorkbook();
//在Workbook中，創建一個sheet，對應Excel中的工作薄（sheet）
HSSFSheet sheet = wb.createSheet(excelName);
//創建單元格，並設置值表頭 設置表頭居中
HSSFCellStyle style = wb.createCellStyle();
//創建一個居中格式
style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
// 填充工作表
fillSheet(sheet, list, fieldMap, style);

//將文件輸出
OutputStream ouputStream = response.getOutputStream();
wb.write(ouputStream);
ouputStream.flush();
ouputStream.close();
} catch (Exception e) {
logger.info("導出Excel失敗！");
logger.error(e.getMessage());
}
}

/**
* 根據欄位名獲取欄位對象
*
* @param fieldName 欄位名
* @param clazz 包含該欄位的類
* @return 欄位
*/
public static Field getFieldByName(String fieldName, Class<?> clazz) {
logger.info("根據欄位名獲取欄位對象:getFieldByName()");
// 拿到本類的所有欄位
Field[] selfFields = clazz.getDeclaredFields();

// 如果本類中存在該欄位，則返回
for (Field field : selfFields) {
//如果本類中存在該欄位，則返回
if (field.getName().equals(fieldName)) {
return field;
}
}

// 否則，查看父類中是否存在此欄位，如果有則返回
Class<?> superClazz = clazz.getSuperclass();
if (superClazz != null && superClazz != Object.class) {
//遞歸
return getFieldByName(fieldName, superClazz);
}

// 如果本類和父類都沒有，則返回空
return null;
}

/**
* 根據欄位名獲取欄位值
*
* @param fieldName 欄位名
* @param o 對象
* @return 欄位值
* @throws Exception 異常
*/
public static Object getFieldValueByName(String fieldName, Object o)
throws Exception {

logger.info("根據欄位名獲取欄位值:getFieldValueByName()");
Object value = null;
//根據欄位名得到欄位對象
Field field = getFieldByName(fieldName, o.getClass());

//如果該欄位存在，則取出該欄位的值
if (field != null) {
field.setAccessible(true);//類中的成員變數為private,在類外邊使用屬性值，故必須進行此操作
value = field.get(o);//獲取當前對象中當前Field的value
} else {
throw new Exception(o.getClass().getSimpleName() + "類不存在欄位名 "
+ fieldName);
}

return value;
}

/**
* 根據帶路徑或不帶路徑的屬性名獲取屬性值,即接受簡單屬性名，
* 如userName等，又接受帶路徑的屬性名，如student.department.name等
*
* @param fieldNameSequence 帶路徑的屬性名或簡單屬性名
* @param o 對象
* @return 屬性值
* @throws Exception 異常
*/
public static Object getFieldValueByNameSequence(String fieldNameSequence,
Object o) throws Exception {
logger.info("根據帶路徑或不帶路徑的屬性名獲取屬性值,即接受簡單屬性名:getFieldValueByNameSequence()");
Object value = null;

// 將fieldNameSequence進行拆分
String[] attributes = fieldNameSequence.split("\\.");
if (attributes.length == 1) {
value = getFieldValueByName(fieldNameSequence, o);
} else {
// 根據數組中第一個連接屬性名獲取連接屬性對象，如student.department.name
Object fieldObj = getFieldValueByName(attributes[0], o);
//截取除第一個屬性名之後的路徑
String subFieldNameSequence = fieldNameSequence
.substring(fieldNameSequence.indexOf(".") + 1);
//遞歸得到最終的屬性對象的值
value = getFieldValueByNameSequence(subFieldNameSequence, fieldObj);
}
return value;

}

/**
* 向工作表中填充數據
*
* @param sheet excel的工作表名稱
* @param list 數據源
* @param fieldMap 中英文欄位對應關係的Map
* @param style 表格中的格式
* @throws Exception 異常
*/
public static <T> void fillSheet(HSSFSheet sheet, List<T> list,
LinkedHashMap<String, String> fieldMap, HSSFCellStyle style) throws Exception {
logger.info("向工作表中填充數據:fillSheet()");
// 定義存放英文欄位名和中文欄位名的數組
String[] enFields = new String[fieldMap.size()];
String[] cnFields = new String[fieldMap.size()];

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

//在sheet中添加表頭第0行,注意老版本poi對Excel的行數列數有限制short
HSSFRow row = sheet.createRow((int) 0);

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

// 填充內容
for (int index = 0; index < list.size(); index++) {
row = sheet.createRow(index + 1);
// 獲取單個對象
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);
}
}
}

}

 

3.編寫實體類
需要輸出到Excel的實體表。

package org.emall.website.entity;

import java.math.BigInteger;

/**
* @version v.0.1
* @Description TODO
* @date 2020/6/1
* @備註
**/
public class Excel {
private BigInteger id;
private String order_number;
private String amount_real;
private String date_add;
private String status_str;
private String link_man;
private String mobie;
private String address;
private String detailValue;

public Excel() {

}

public Excel(BigInteger id, String order_number, String amount_real, String date_add, String status_str, String link_man, String mobie, String address, String detailValue) {
this.id = id;
this.order_number = order_number;
this.amount_real = amount_real;
this.date_add = date_add;
this.status_str = status_str;
this.link_man = link_man;
this.mobie = mobie;
this.address = address;
this.detailValue = detailValue;
}

public BigInteger getId() {
return id;
}

public void setId(BigInteger id) {
this.id = id;
}

public String getOrder_number() {
return order_number;
}

public void setOrder_number(String order_number) {
this.order_number = order_number;
}

public String getAmount_real() {
return amount_real;
}

public void setAmount_real(String amount_real) {
this.amount_real = amount_real;
}

public String getDate_add() {
return date_add;
}

public void setDate_add(String date_add) {
this.date_add = date_add;
}

public String getStatus_str() {
return status_str;
}

public void setStatus_str(String status_str) {
this.status_str = status_str;
}

public String getLink_man() {
return link_man;
}

public void setLink_man(String link_man) {
this.link_man = link_man;
}

public String getMobie() {
return mobie;
}

public void setMobie(String mobie) {
this.mobie = mobie;
}

public String getAddress() {
return address;
}

public void setAddress(String address) {
this.address = address;
}

public String getDetailValue() {
return detailValue;
}

public void setDetailValue(String detailValue) {
this.detailValue = detailValue;
}
}

 

4.編寫控制層即得到Json數據
編寫控制層ExcelController，注意fieldMap.put(「實體類屬性名」,「Excel中顯示的屬性名」); 設置實體屬性名和資料庫中對應。如果得不到數據對應不上，請採用ResultMap設置或者用Select XX（資料庫名）As 實體屬性名。

package org.emall.website.controller;

import org.emall.website.entity.Excel;
import org.emall.website.entity.Order;
import org.emall.website.service.OrderService;
import org.emall.website.util.ExportExcelUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.LinkedHashMap;
import java.util.List;

/**
* @version v.0.1
* @Description TODO
* @date 2020/6/1
* @備註
**/
@Controller
public class ExcelController {

@Autowired
private HttpServletRequest request;
@Autowired
private OrderService orderService;

@RequestMapping(value = "/excel/exportBankCheckInfo",method = RequestMethod.GET)
public void ExportBankCkeckInfo(HttpServletResponse response, HttpServletRequest request){
//這裡是筆者實際業務需求中需要得到時間間隔。可忽略
String start=request.getParameter("start");
String end=request.getParameter("end");
System.out.println("列印的起始日期為："+start+"，列印的結束日期為："+end);
//得到所有要導出的數據
List<Excel> orderlist =orderService.listexcel(start,end);
//定義導出的excel名字
String excelName = "訂單詳情表";

//獲取需要轉出的excel表頭的map欄位
LinkedHashMap<String, String> fieldMap = new LinkedHashMap<>();
fieldMap.put("id","編號");
fieldMap.put("link_man","姓名");
fieldMap.put("amount_real","價格");
fieldMap.put("date_add","日期");
fieldMap.put("status_str","訂單狀態");
fieldMap.put("mobie","收貨電話");
fieldMap.put("address","地址");
fieldMap.put("detailValue","訂單詳情");

//導出用戶相關資訊
new ExportExcelUtils().export(excelName,orderlist,fieldMap,response);
}

}

　　

5.驗證
在導出工具類中，通過HttpServletResponse response設置輸出為Excel。所以通過Controller層的Url可以直接得到URL。保存位置是保存在瀏覽器的默認保存位置，因為是下載請求。

VirMach 便宜 VPS

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