spring boot 整合 poi 导出excel

一、 第一种方式

1.首先从中央仓库中导入架包Poi3.14以及Poi-ooxml3.14.

<dependency>
   <groupId>org.apache.poi</groupId>
   <artifactId>poi</artifactId>
   <version>3.17</version>
</dependency>

2.编写工具类
编写用于导出Excel的工具类ExportExcelUtils，工具类可以直接使用，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表格导出
     *
     * @param response    HttpServletResponse对象
     * @param excelData   Excel表格的数据，封装为List<List<String>>
     * @param sheetName   sheet的名字
     * @param fileName    导出Excel的文件名
     * @param columnWidth Excel表格的宽度，建议为15
     * @throws IOException 抛IO异常
     */
    public static void exportExcel(HttpServletResponse response,
                                   List<List<String>> excelData,
                                   String sheetName,
                                   String fileName,
                                   int columnWidth) throws IOException {

        //声明一个工作簿
        HSSFWorkbook workbook = new HSSFWorkbook();

        //生成一个表格，设置表格名称
        HSSFSheet sheet = workbook.createSheet(sheetName);

        //设置表格列宽度
        sheet.setDefaultColumnWidth(columnWidth);

        //写入List<List<String>>中的数据
        int rowIndex = 0;
        for (List<String> data : excelData) {
            //创建一个row行，然后自增1
            HSSFRow row = sheet.createRow(rowIndex++);

            //遍历添加本行数据
            for (int i = 0; i < data.size(); i++) {
                //创建一个单元格
                HSSFCell cell = row.createCell(i);

                //创建一个内容对象
                HSSFRichTextString text = new HSSFRichTextString(data.get(i));

                //将内容对象的文字内容写入到单元格中
                cell.setCellValue(text);
            }
        }

        //准备将Excel的输出流通过response输出到页面下载
        //八进制输出流
        response.setContentType("application/octet-stream");

        //设置导出Excel的名称
        response.setHeader("Content-disposition", "attachment;filename=" + java.net.URLEncoder.encode(fileName, "UTF-8"));

        //刷新缓冲
        response.flushBuffer();

        //workbook将Excel写入到response的输出流中，供页面下载该Excel文件
        workbook.write(response.getOutputStream());

        //关闭workbook
        workbook.close();
    }

}

3.service导出实现

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("订单编号");
        head.add("讲师信息");
        head.add("用户手机号");
        head.add("用户姓名");
        if (courseFlagEnum == CourseFlagEnum.YUNXIAOHUI) {
            head.add("机构名称");
        }
        head.add("课程顾问");
        head.add("课程名称");
        head.add("课程原价");
        head.add("课程实付");
        head.add("齿币");
        head.add("交易类型");
        head.add("支付方式");
        head.add("购买渠道");
        head.add("支付时间");
        head.add("客户备注");
        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 = "课程订单";
        String fileName = "订单报表-";
        if (courseFlagEnum == CourseFlagEnum.YUNXIAOHUI) {
            fileName = "云校汇订单报表";
        }
        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.接口调用

/**
     * 报表导出
     *
     * @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、第二种方式

1.首先从中央仓库中导入架包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.编写工具类
编写用于导出Excel的工具类ExportExcelUtils，工具类可以直接使用，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
* @备注
**/
public class ExportExcelUtils {
private static final Logger logger = LoggerFactory.getLogger(ExportExcelUtils.class);

/**
* 导出Excel
*
* @param excelName 要导出的excel名称
* @param list 要导出的数据集合
* @param fieldMap 中英文字段对应Map，即要导出的excel表头
* @param response 使用response可以导出到浏览器
* @param <T>
*/
public static <T> void export(String excelName, List<T> list, LinkedHashMap<String, String> fieldMap, HttpServletResponse response) {

// 设置默认文件名为当前时间：年月日时分秒
if (excelName == null || excelName == "") {
excelName = new SimpleDateFormat("yyyyMMddhhmmss").format(
new Date()).toString();
}
// 设置response头信息
response.reset();
response.setContentType("application/vnd.ms-excel"); // 改成输出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 {
//创建一个WorkBook,对应一个Excel文件
HSSFWorkbook wb = new HSSFWorkbook();
//在Workbook中，创建一个sheet，对应Excel中的工作薄（sheet）
HSSFSheet sheet = wb.createSheet(excelName);
//创建单元格，并设置值表头 设置表头居中
HSSFCellStyle style = wb.createCellStyle();
//创建一个居中格式
style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
// 填充工作表
fillSheet(sheet, list, fieldMap, style);

//将文件输出
OutputStream ouputStream = response.getOutputStream();
wb.write(ouputStream);
ouputStream.flush();
ouputStream.close();
} catch (Exception e) {
logger.info("导出Excel失败！");
logger.error(e.getMessage());
}
}

/**
* 根据字段名获取字段对象
*
* @param fieldName 字段名
* @param clazz 包含该字段的类
* @return 字段
*/
public static Field getFieldByName(String fieldName, Class<?> clazz) {
logger.info("根据字段名获取字段对象:getFieldByName()");
// 拿到本类的所有字段
Field[] selfFields = clazz.getDeclaredFields();

// 如果本类中存在该字段，则返回
for (Field field : selfFields) {
//如果本类中存在该字段，则返回
if (field.getName().equals(fieldName)) {
return field;
}
}

// 否则，查看父类中是否存在此字段，如果有则返回
Class<?> superClazz = clazz.getSuperclass();
if (superClazz != null && superClazz != Object.class) {
//递归
return getFieldByName(fieldName, superClazz);
}

// 如果本类和父类都没有，则返回空
return null;
}

/**
* 根据字段名获取字段值
*
* @param fieldName 字段名
* @param o 对象
* @return 字段值
* @throws Exception 异常
*/
public static Object getFieldValueByName(String fieldName, Object o)
throws Exception {

logger.info("根据字段名获取字段值:getFieldValueByName()");
Object value = null;
//根据字段名得到字段对象
Field field = getFieldByName(fieldName, o.getClass());

//如果该字段存在，则取出该字段的值
if (field != null) {
field.setAccessible(true);//类中的成员变量为private,在类外边使用属性值，故必须进行此操作
value = field.get(o);//获取当前对象中当前Field的value
} else {
throw new Exception(o.getClass().getSimpleName() + "类不存在字段名 "
+ fieldName);
}

return value;
}

/**
* 根据带路径或不带路径的属性名获取属性值,即接受简单属性名，
* 如userName等，又接受带路径的属性名，如student.department.name等
*
* @param fieldNameSequence 带路径的属性名或简单属性名
* @param o 对象
* @return 属性值
* @throws Exception 异常
*/
public static Object getFieldValueByNameSequence(String fieldNameSequence,
Object o) throws Exception {
logger.info("根据带路径或不带路径的属性名获取属性值,即接受简单属性名:getFieldValueByNameSequence()");
Object value = null;

// 将fieldNameSequence进行拆分
String[] attributes = fieldNameSequence.split("\\.");
if (attributes.length == 1) {
value = getFieldValueByName(fieldNameSequence, o);
} else {
// 根据数组中第一个连接属性名获取连接属性对象，如student.department.name
Object fieldObj = getFieldValueByName(attributes[0], o);
//截取除第一个属性名之后的路径
String subFieldNameSequence = fieldNameSequence
.substring(fieldNameSequence.indexOf(".") + 1);
//递归得到最终的属性对象的值
value = getFieldValueByNameSequence(subFieldNameSequence, fieldObj);
}
return value;

}

/**
* 向工作表中填充数据
*
* @param sheet excel的工作表名称
* @param list 数据源
* @param fieldMap 中英文字段对应关系的Map
* @param style 表格中的格式
* @throws Exception 异常
*/
public static <T> void fillSheet(HSSFSheet sheet, List<T> list,
LinkedHashMap<String, String> fieldMap, HSSFCellStyle style) throws Exception {
logger.info("向工作表中填充数据:fillSheet()");
// 定义存放英文字段名和中文字段名的数组
String[] enFields = new String[fieldMap.size()];
String[] cnFields = new String[fieldMap.size()];

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

//在sheet中添加表头第0行,注意老版本poi对Excel的行数列数有限制short
HSSFRow row = sheet.createRow((int) 0);

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

// 填充内容
for (int index = 0; index < list.size(); index++) {
row = sheet.createRow(index + 1);
// 获取单个对象
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.编写实体类
需要输出到Excel的实体表。

package org.emall.website.entity;

import java.math.BigInteger;

/**
* @version v.0.1
* @Description TODO
* @date 2020/6/1
* @备注
**/
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.编写控制层即得到Json数据
编写控制层ExcelController，注意fieldMap.put(“实体类属性名”,“Excel中显示的属性名”); 设置实体属性名和数据库中对应。如果得不到数据对应不上，请采用ResultMap设置或者用Select XX（数据库名）As 实体属性名。

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
* @备注
**/
@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){
//这里是笔者实际业务需求中需要得到时间间隔。可忽略
String start=request.getParameter("start");
String end=request.getParameter("end");
System.out.println("打印的起始日期为："+start+"，打印的结束日期为："+end);
//得到所有要导出的数据
List<Excel> orderlist =orderService.listexcel(start,end);
//定义导出的excel名字
String excelName = "订单详情表";

//获取需要转出的excel表头的map字段
LinkedHashMap<String, String> fieldMap = new LinkedHashMap<>();
fieldMap.put("id","编号");
fieldMap.put("link_man","姓名");
fieldMap.put("amount_real","价格");
fieldMap.put("date_add","日期");
fieldMap.put("status_str","订单状态");
fieldMap.put("mobie","收货电话");
fieldMap.put("address","地址");
fieldMap.put("detailValue","订单详情");

//导出用户相关信息
new ExportExcelUtils().export(excelName,orderlist,fieldMap,response);
}

}

　　

5.验证
在导出工具类中，通过HttpServletResponse response设置输出为Excel。所以通过Controller层的Url可以直接得到URL。保存位置是保存在浏览器的默认保存位置，因为是下载请求。