easypoi Excel的导入导出(完整示例)

神龙大侠学java 2024-07-26 11:35:02 阅读 62

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文章目录

前言

        easypoi官方文档

一、准备工作,导包

二、导入

2.1  无校验结果导入

2.2  有校验结果的导入

2.3  大数据导入

三、导出

3.1  简单导出

3.2  模板导出

3.3  多 sheet 的模板导出

3.4  大数据导出

方法一:先查出数据,再导

方法二:在导入的方法中查数据


前言

easypoi官方文档

旧地址:EasyPoi教程_V1.0

新地址:1. 前言 - Powered by MinDoc

一、准备工作,导包

 easypoi 3.x 的版本和 4.x 的版本有的地方有略微的不同,但最后实现的效果都差不多,这里我用的是 4.4.0 的

<code> <dependency>

<groupId>cn.afterturn</groupId>

<artifactId>easypoi-base</artifactId>

<version>4.4.0</version>

</dependency>

<dependency>

<groupId>cn.afterturn</groupId>

<artifactId>easypoi-web</artifactId>

<version>4.4.0</version>

</dependency>

<dependency>

<groupId>cn.afterturn</groupId>

<artifactId>easypoi-annotation</artifactId>

<version>4.4.0</version>

</dependency>

<dependency>

<groupId>xerces</groupId>

<artifactId>xercesImpl</artifactId>

<version>2.12.2</version>

</dependency>

easypoi-annotation :基础注解包,作用与实体对象上,拆分后方便maven多工程的依赖管理

easypoi-base :导入导出的工具包,可以完成Excel导出,导入,Word的导出,Excel的导出功能

easypoi-web :耦合了spring-mvc 基于AbstractView,极大的简化spring-mvc下的导出功能

xercesImpl : 支持通过 Sax 方式的大数据量导入


二、导入

2.1  无校验结果导入

关键代码: ExcelImportUtil.importExcel(InputStream inputstream, Class<?> pojoClass,

ImportParams params);

inputstream: 数据源输入流,也就是文件输入流

pojoClass:    接收文件类型的类

params:        导入参数,直接 new ImportParams()

        1. 准备一张数据表,如:

        2.定义对应的对象,顺序可以和表中不一样,属性也可以没有,但是需要赋值的属性它的 @Excel(name="") 要和表中字段一一对应上:

<code>package web_test.model;

import cn.afterturn.easypoi.excel.annotation.Excel;

import com.fasterxml.jackson.annotation.JsonFormat;

import lombok.Data;

import lombok.EqualsAndHashCode;

import org.springframework.format.annotation.DateTimeFormat;

import web_test.model.onecodeend.ExcelVerifyInfo;

import java.util.Date;

/**

* @author shenlongdaxia

*/

@EqualsAndHashCode(callSuper = false)

@Data

public class ImportEntity {

@Excel(name = "序号")

private String serialNum;

@Excel(name = "姓名")

private String name;

@Excel(name = "性别", replace = {"男_true", "女_false"})

private Boolean sex;

@Excel(name = "电话")

private String phone;

@Excel(name = "购买时间", format = "yyyy-MM-dd HH:mm:ss")

@JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss", timezone = "GMT+08")

private Date buyTime;

@Excel(name = "住址")

private String address;

@Excel(name = "水果", groupName = "订单类别")

private String fruitsName;

@Excel(name = "蔬菜")

private String vegetableName;

}

replace:  会将 "_" 前的内容替换成后面的 

format :  会解析Excel 中的时间内容,但必须和 指定解析的格式一样,结合 @JsonFormat 注解,就可以将时间解析为标准格式了

groupName:会自动识别出Excel 水平合并的单元格,直到出现下一个 groupName 为止

 controller 

@PostMapping("/importExcel")

public List<ImportEntity> importExcel(@RequestPart("file") MultipartFile file){

return apiTestService.importExcel(file);

}

serviceImpl:

@Override

public List<ImportEntity> importExcel(MultipartFile file) {

try {

ImportParams params = new ImportParams();

params.setHeadRows(2);

List<ImportEntity> list = ExcelImportUtil.importExcel(file.getInputStream(), ImportEntity.class, params);

return list;

} catch (Exception e) {

throw new RuntimeException(e);

}

}

结果:


2.2  有校验结果的导入

关键代码: ExcelImportUtil.importExcelMore(InputStream inputstream, Class<?> pojoClass,

ImportParams params);

inputstream: 数据源输入流,也就是文件输入流

pojoClass:    接收文件内容的类的字节码类型

params:        导入参数,直接 new ImportParams()

注意导入的方法是 importExcelMore ,比 无校验的导入 多了一个 More

        1.  还是这张表,这里我们把导入的实体类 ImportEntity 改造一下,使其可以额外记录一些错误的信息

<code>package web_test.model;

import cn.afterturn.easypoi.excel.annotation.Excel;

import cn.afterturn.easypoi.handler.inter.IExcelDataModel;

import cn.afterturn.easypoi.handler.inter.IExcelModel;

import com.fasterxml.jackson.annotation.JsonFormat;

import lombok.Data;

import lombok.EqualsAndHashCode;

import java.util.Date;

/**

* @author shenlongdaxia

*/

@EqualsAndHashCode(callSuper = false)

@Data

public class ImportEntity implements IExcelModel, IExcelDataModel {

@Excel(name = "序号")

private String serialNum;

@Excel(name = "姓名")

private String name;

@Excel(name = "性别", replace = {"男_true", "女_false"})

private Boolean sex;

@Excel(name = "电话")

private String phone;

@Excel(name = "购买时间", format = "yyyy-MM-dd HH:mm:ss")

@JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss", timezone = "GMT+08")

private Date buyTime;

@Excel(name = "住址")

private String address;

@Excel(name = "水果", groupName = "订单类别")

private String fruitsName;

@Excel(name = "蔬菜")

private String vegetableName;

/**

* 记录当前是第几行

*/

private Integer rowNum;

/**

* 记录当前行在校验时存在的错误信息

*/

private String errorMsg;

@Override

public Integer getRowNum() {

return this.rowNum;

}

@Override

public void setRowNum(Integer integer) {

this.rowNum = integer;

}

@Override

public String getErrorMsg() {

return this.errorMsg;

}

@Override

public void setErrorMsg(String s) {

this.errorMsg = s;

}

}

  controller:

@PostMapping("/importExcel")

public void importExcel(@RequestPart("file") MultipartFile file){

apiTestService.importExcel(file);

}

   serviceImpl:

先注入 校验处理器:

@Service

public class ApiTestServiceImpl implements IApiTestService {

@Resource

ExcelVerifyHandler handler;

@Override

public void importExcel(MultipartFile file) {

try {

ImportParams params = new ImportParams();

params.setHeadRows(2);

// 设置是否需要校验为 true,开启校验

params.setNeedVerify(true);

// 设置校验处理器,我们将校验的内容放在这个里面

params.setVerifyHandler(new ExcelVerifyHandler());

// 这里的导入结果里面既有检验失败的数据,也有校验成功的数据

ExcelImportResult<ImportEntity> importResult = ExcelImportUtil.importExcelMore(file.getInputStream(), ImportEntity.class, params);

// 获取校验成功的数据

List<ImportEntity> list = importResult.getList();

// 我们来打印信息校验成功的数据看看

list.forEach(System.out::println);

// 获取校验失败的数据

List<ImportEntity> failList = importResult.getFailList();

// 我们来打印信息校验失败的数据看看

if (failList != null){

failList.forEach(System.out::println);

// 再来看看检验失败数据的错误信息

String errorMsg = failList.stream().map(ImportEntity::getErrorMsg).collect(Collectors.joining(","));

System.out.println("错误原因:" + errorMsg);

}

} catch (Exception e) {

throw new RuntimeException(e);

}

}

}

ExcelVerifyHandler :

package web_test.handler;

import cn.afterturn.easypoi.excel.entity.result.ExcelVerifyHandlerResult;

import cn.afterturn.easypoi.handler.inter.IExcelVerifyHandler;

import web_test.model.ImportEntity;

/**

* @author shenlongdaxia

*/

public class ExcelVerifyHandler implements IExcelVerifyHandler<ImportEntity> {

/**

* 具体校验的方法,它会每一行每一行的校验

*

* @param entity

* @return ExcelVerifyHandlerResult

*/

@Override

public ExcelVerifyHandlerResult verifyHandler(ImportEntity entity) {

System.out.println("正在校验第 " + entity.getRowNum() + " 行");

if (entity.getAddress() == null) {

return new ExcelVerifyHandlerResult(false, "第 " + entity.getRowNum() + " 行地址不能为空");

}

return new ExcelVerifyHandlerResult(true);

}

}

把 Excel 加点错误数据:

结果:

这样直接把 行号、错误信息和实体类 写在一起的话,每条数据都会带着这俩多余的信息,所以我们可以把这两个提出去,让实体类 去继承,最后我们得到的数据就没有多余的内容了:

ImportEntity:

<code>package web_test.model;

import cn.afterturn.easypoi.excel.annotation.Excel;

import com.fasterxml.jackson.annotation.JsonFormat;

import lombok.Data;

import lombok.EqualsAndHashCode;

import web_test.model.onecodeend.ExcelVerifyInfo;

import java.util.Date;

/**

* @author shenlongdaxia

*/

@EqualsAndHashCode(callSuper = false)

@Data

public class ImportEntity extends ExcelVerifyInfo {

@Excel(name = "序号")

private String serialNum;

@Excel(name = "姓名")

private String name;

@Excel(name = "性别", replace = {"男_true", "女_false"})

private Boolean sex;

@Excel(name = "电话")

private String phone;

@Excel(name = "购买时间", format = "yyyy-MM-dd HH:mm:ss")

@JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss", timezone = "GMT+08")

private Date buyTime;

@Excel(name = "住址")

private String address;

@Excel(name = "水果", groupName = "订单类别")

private String fruitsName;

@Excel(name = "蔬菜")

private String vegetableName;

}

 ExcelVerifyInfo :

package web_test.model;

import cn.afterturn.easypoi.handler.inter.IExcelDataModel;

import cn.afterturn.easypoi.handler.inter.IExcelModel;

import lombok.Data;

/**

* Excel校验基类

*

* @author shenlongdaxia

*/

@Data

public class ExcelVerifyInfo implements IExcelModel, IExcelDataModel {

private Integer rowNum;

private String errorMsg;

@Override

public String getErrorMsg() {

return errorMsg;

}

@Override

public void setErrorMsg(String errorMsg) {

this.errorMsg = errorMsg;

}

@Override

public Integer getRowNum() {

return this.rowNum;

}

@Override

public void setRowNum(Integer rowNum) {

this.rowNum = rowNum;

}

}

结果:

 雅~ 😎


2.3  大数据导入

关键代码:void  ExcelImportUtil.importExcelBySax(InputStream inputstream, Class<?> pojoClass, ImportParams params, IReadHandler handler);

注意!! 通过 Sax 方式导入是没有返回值的,数据的保存在 IReadHandler 参数里面进行

inputstream: 传入文件的输入流

pojoClass:接收文件内容的实体类的字节码类型

params: 导入参数

handler: 接口自定义处理类,里面有俩个方法,一个是 handler(),这里面就是每条数据要做什么事情,另一个是 doAfterAll(),这里面就是所有数据处理完之后要做什么事情。直接开 new

表: 塞了 100 条数据

实体类:

因为所有的导入数据的处理都在 IReadHandler 中进行,所有我们的实体类就可以不用实现校验了

<code>package web_test.model;

import cn.afterturn.easypoi.excel.annotation.Excel;

import com.fasterxml.jackson.annotation.JsonFormat;

import lombok.Data;

import lombok.EqualsAndHashCode;

import web_test.model.onecodeend.ExcelVerifyInfo;

import java.util.Date;

/**

* @author shenlongdaxia

*/

@EqualsAndHashCode(callSuper = false)

@Data

public class ImportEntity {

@Excel(name = "序号")

private String serialNum;

@Excel(name = "姓名")

private String name;

@Excel(name = "性别", replace = {"男_true", "女_false"})

private Boolean sex;

@Excel(name = "电话")

private String phone;

@Excel(name = "购买时间", format = "yyyy-MM-dd HH:mm:ss")

@JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss", timezone = "GMT+08")

private Date buyTime;

@Excel(name = "住址")

private String address;

@Excel(name = "水果", groupName = "订单类别")

private String fruitsName;

@Excel(name = "蔬菜")

private String vegetableName;

}

controller:

@PostMapping("/importExcel")

public void importExcel(@RequestPart("file") MultipartFile file){

apiTestService.importExcel(file);

}

serviceImpl:

@Override

public void importExcel(MultipartFile file) {

try {

ImportParams params = new ImportParams();

params.setHeadRows(2);

// 弄一个开始时间和结束时间,看看最后的执行效果怎么样

long startTime = new Date().getTime();

final long[] endTime = new long[1];

// 创建一个数组来保存导入的数据

LinkedList<ImportEntity> entities = new LinkedList<>();

ExcelImportUtil.importExcelBySax(file.getInputStream(), ImportEntity.class, params, new IReadHandler<ImportEntity>() {

@Override

public void handler(ImportEntity entity) {

// 在这里处理每条数据,因为这种导入没有返回值,所有我们可以在这里进行校验,并把通过的塞进 list 中

if (entity.getAddress() != null) {

entities.add(entity);

}

}

@Override

public void doAfterAll() {

// 里面的变量默认是数组的

endTime[0] = new Date().getTime();

}

});

// 输出下 list 的数量

System.out.println("导入的数据共有:" + entities.size() + "条");

// 计算一下导入的时间为

System.out.println("导入时间共计:" + (endTime[0] - startTime) + " ms");

} catch (Exception e) {

throw new RuntimeException(e);

}

}

结果:


三、导出

3.1  简单导出

关键代码:ExcelExportUtil.exportExcel(ExportParams entity, Class<?> pojoClass, Collection<?> dataSet);

entity:        导入参数,常用的就是传入 title 和 sheetName,直接开 new

pojoClass:        导出文件内容的类的字节码类型

dataSet:        需要导出的数据

表:

导出实体类:

<code>package web_test.model;

import cn.afterturn.easypoi.excel.annotation.Excel;

import lombok.AllArgsConstructor;

import lombok.Data;

import lombok.EqualsAndHashCode;

import lombok.NoArgsConstructor;

import java.util.Date;

/**

* @author shenlongdaxia

*/

@EqualsAndHashCode(callSuper = false)

@Data

@NoArgsConstructor

@AllArgsConstructor

public class ExportEntity {

@Excel(name = "序号", needMerge = true)

private Integer serialNum;

@Excel(name = "姓名", needMerge = true)

private String name;

@Excel(name = "性别", needMerge = true, replace = {"男_true", "女_false"}, width = 15.0)

private Boolean sex;

@Excel(name = "电话", needMerge = true)

private String phone;

@Excel(name = "购买时间", format = "yyyy-MM-dd HH:mm:ss", needMerge = true, width = 20.0)

private Date buyTime;

@Excel(name = "住址", needMerge = true, width = 15.0)

private String address;

@Excel(name = "水果", groupName = "订单类别", width = 15.0)

private String fruitsName;

@Excel(name = "蔬菜", groupName = "订单类别", width = 15.0)

private String vegetableName;

}

controller:

@GetMapping(value = "/exportExcelTest")

public void exportExcelTest(HttpServletResponse response) {

apiTestService.exportExcelTest(response);

}

serviceImpl:

@Override

public void exportExcelTest(HttpServletResponse response) {

LinkedList<ExportEntity> entities = new LinkedList<>();

// 先造一些数据

for (int i = 1; i < 101; i++) {

ExportEntity entity = new ExportEntity(i, "zs" + i, i % 2 == 0, "134" + i, new Date(),

"汤臣" + i + "品", i + "个苹果", i + "个西红柿");

entities.add(entity);

}

// 导出,并获取工作簿

Workbook workbook = ExcelExportUtil.exportExcel(new ExportParams(null, "简单导出测试表"), ExportEntity.class, entities);

// 输出

responseWorkbook(response, workbook, "简单导出.xlsx");

}

/**

* 导出 Excel

*

* @param response

* @param workbook

* @param fileName

*/

private static void responseWorkbook(HttpServletResponse response, Workbook workbook, String fileName) {

try {

response.setHeader("Content-disposition", "attachment;" + "filename*=utf-8''" + URLEncoder.encode(fileName, "UTF-8"));

response.setContentType("application/octet-stream; charset=UTF-8");

workbook.write(response.getOutputStream());

workbook.close();

} catch (IOException e) {

throw new RuntimeException(e);

}

}

结果:

简单导出的关键在于实体类的设置,需要根据表头去一点一点的去调整,贼拉麻烦,所以就有了模板导出


3.2  模板导出

关键代码:ExcelExportUtil.exportExcel(TemplateExportParams params, Map<String, Object> map);

params:模板参数,直接开 new,第一个参数是模板文件的位置,第二个参数是在第几个sheet 中导出,位置从 0 开始

map: 导出的内容数据

导出模板:

 位置:

导出实体类:

<code>package web_test.model;

import cn.afterturn.easypoi.excel.annotation.Excel;

import lombok.AllArgsConstructor;

import lombok.Data;

import lombok.EqualsAndHashCode;

import lombok.NoArgsConstructor;

import java.util.Date;

/**

* @author shenlongdaxia

*/

@EqualsAndHashCode(callSuper = false)

@Data

@NoArgsConstructor

@AllArgsConstructor

public class ExportEntity {

private Integer serialNum;

private String name;

private Boolean sex;

private String phone;

private Date buyTime;

private String address;

private String fruitsName;

private String vegetableName;

}

serviceImpl:

@Override

public void exportExcelTest(HttpServletResponse response) {

// ================= 准备环节 ==================

LinkedList<ExportEntity> entities = new LinkedList<>();

// 先造一些数据

for (int i = 1; i < 101; i++) {

ExportEntity entity = new ExportEntity(i, "zs" + i, i % 2 == 0, "134" + i, new Date(),

"模板之汤臣" + i + "品", i + "个苹果", i + "个西红柿");

entities.add(entity);

}

// ================= 主要环节 ==================

// 获取模板数据

TemplateExportParams params = new TemplateExportParams("test/导出模板.xlsx", 0);

ArrayList<Map<String, Object>> list = new ArrayList<>();

for (ExportEntity entity : entities) {

// 塞入具体数据,工具类用的是 hutool 包

list.add(BeanUtil.beanToMap(entity));

}

HashMap<String, Object> workbookNeedMap = new HashMap<>();

workbookNeedMap.put("maps", list);

// 导出,并获取工作簿

Workbook workbook = ExcelExportUtil.exportExcel(params, workbookNeedMap);

// ================= 结束输出 ==================

// 输出

responseWorkbook(response, workbook, "模板导出.xlsx");

}

/**

* 导出 Excel

*

* @param response

* @param workbook

* @param fileName

*/

private static void responseWorkbook(HttpServletResponse response, Workbook workbook, String fileName) {

try {

response.setHeader("Content-disposition", "attachment;" + "filename*=utf-8''" + URLEncoder.encode(fileName, "UTF-8"));

response.setContentType("application/octet-stream; charset=UTF-8");

workbook.write(response.getOutputStream());

workbook.close();

} catch (IOException e) {

throw new RuntimeException(e);

}

}

结果:

可以发现,模板导出的特点就是只填充表的数据,表的格式根本就不用管,甚至连实体类都是干净的一毛不拔,贼拉方便。里面的数据我们也可以在塞数据时进行微调:

<code>// ================= 主要环节 ==================

// 获取模板数据

TemplateExportParams params = new TemplateExportParams("test/导出模板.xlsx", 0);

ArrayList<Map<String, Object>> list = new ArrayList<>();

for (ExportEntity entity : entities) {

// 塞入具体数据,工具类都是 hutool 包提供

Map<String, Object> map = BeanUtil.beanToMap(entity);

map.put("sex", entity.getSex() ? "男" : "女");

map.put("buyTime", DateUtil.format(entity.getBuyTime(), "yyyy-MM-dd HH:mm:ss"));

list.add(map);

}

HashMap<String, Object> workbookNeedMap = new HashMap<>();

workbookNeedMap.put("maps", list);

// 导出,并获取工作簿

Workbook workbook = ExcelExportUtil.exportExcel(params, workbookNeedMap);

其他的都不用变,结果:

完美~😎


3.3  多 sheet 的模板导出

关键代码:ExcelExportUtil.exportExcel(TemplateExportParams params, Map<String, Object> map);

params:模板参数,将第二个 sheet 参数设置为 true

map: 导出的内容数据,将多个 sheet 的 map 都添加进这里面

和 模板导出不同的地方就是将 导入的模板参数的 第二个设置为 true,然后不同的 sheet 表其表达式的 maps 设置成不同的参数就可以了。

表:

Role 实体类:

<code>package web_test.model;

import lombok.AllArgsConstructor;

import lombok.Data;

import lombok.EqualsAndHashCode;

import lombok.NoArgsConstructor;

import java.util.Date;

/**

* @author shenlongdaxia

*/

@EqualsAndHashCode(callSuper = false)

@Data

@NoArgsConstructor

@AllArgsConstructor

public class RoleEntity {

private Integer id;

private String name;

private String type;

}

serviceImpl:

@Override

public void exportExcelTest(HttpServletResponse response) {

// ================= 准备环节 ==================

LinkedList<ExportEntity> entities = new LinkedList<>();

LinkedList<RoleEntity> roles = new LinkedList<>();

// 先造一些数据

for (int i = 1; i < 101; i++) {

ExportEntity entity = new ExportEntity(i, "zs" + i, i % 2 == 0, "134" + i, new Date(),

"模板之汤臣" + i + "品", i + "个苹果", i + "个西红柿");

entities.add(entity);

roles.add(new RoleEntity(i, "角色" + i, "类型" + i));

}

// ================= 主要环节 ==================

// 获取模板数据

TemplateExportParams params = new TemplateExportParams("test/导出模板.xlsx", true);

// 塞 sheet1 表的数据

ArrayList<Map<String, Object>> list = new ArrayList<>();

for (ExportEntity entity : entities) {

// 塞入具体数据,工具类都是 hutool 包提供

Map<String, Object> map = BeanUtil.beanToMap(entity);

map.put("sex", entity.getSex() ? "男" : "女");

map.put("buyTime", DateUtil.format(entity.getBuyTime(), "yyyy-MM-dd HH:mm:ss"));

list.add(map);

}

// 塞 sheet2 表的数据

ArrayList<Map<String, Object>> roleList = new ArrayList<>();

for (RoleEntity role : roles) {

list.add(BeanUtil.beanToMap(role));

}

HashMap<String, Object> workbookNeedMap = new HashMap<>();

workbookNeedMap.put("maps", list);

workbookNeedMap.put("aa", roleList);

// 导出,并获取工作簿

Workbook workbook = ExcelExportUtil.exportExcel(params, workbookNeedMap);

// ================= 结束输出 ==================

// 输出

responseWorkbook(response, workbook, "模板导出.xlsx");

}

/**

* 导出 Excel

*

* @param response

* @param workbook

* @param fileName

*/

private static void responseWorkbook(HttpServletResponse response, Workbook workbook, String fileName) {

try {

response.setHeader("Content-disposition", "attachment;" + "filename*=utf-8''" + URLEncoder.encode(fileName, "UTF-8"));

response.setContentType("application/octet-stream; charset=UTF-8");

workbook.write(response.getOutputStream());

workbook.close();

} catch (IOException e) {

throw new RuntimeException(e);

}

}

结果:

真是妙~~啊


3.4  大数据导出

方法一:先查出数据,再导

核心代码:ExcelExportUtil.exportBigExcel(ExportParams entity, List<ExcelExportEntity> excelParams);

entity:导出参数,直接开 new

excelParams: 导出数据

这种方法比较简单,他的特点是,先把数据查出来保存在 List 中,然后根据实体类的 @Excel 配置直接导出表

实体类:

<code>package web_test.model;

import cn.afterturn.easypoi.excel.annotation.Excel;

import lombok.AllArgsConstructor;

import lombok.Data;

import lombok.EqualsAndHashCode;

import lombok.NoArgsConstructor;

import java.util.Date;

/**

* @author shenlongdaxia

*/

@EqualsAndHashCode(callSuper = false)

@Data

@NoArgsConstructor

@AllArgsConstructor

public class ExportEntity {

@Excel(name = "序号", needMerge = true)

private Integer serialNum;

@Excel(name = "姓名", needMerge = true)

private String name;

@Excel(name = "性别", needMerge = true, replace = {"男_true", "女_false"}, width = 15.0)

private Boolean sex;

@Excel(name = "电话", needMerge = true)

private String phone;

@Excel(name = "购买时间", format = "yyyy-MM-dd HH:mm:ss", needMerge = true, width = 20.0)

private Date buyTime;

@Excel(name = "住址", needMerge = true, width = 15.0)

private String address;

@Excel(name = "水果", groupName = "订单类别", width = 15.0)

private String fruitsName;

@Excel(name = "蔬菜", groupName = "订单类别", width = 15.0)

private String vegetableName;

}

controller:

@GetMapping(value = "/exportExcelTest")

public void exportExcelTest(HttpServletResponse response) {

apiTestService.exportExcelTest(response);

}

serviceImpl:

@Override

public void exportExcelTest(HttpServletResponse response) {

// ================= 准备环节 ==================

LinkedList<ExportEntity> entities = new LinkedList<>();

// 先造一些数据

for (int i = 1; i < 101; i++) {

ExportEntity entity = new ExportEntity(i, "zs" + i, i % 2 == 0, "134" + i, new Date(),

"模板之汤臣" + i + "品", i + "个苹果", i + "个西红柿");

entities.add(entity);

}

// ================= 主要环节 ==================

IWriter<Workbook> writer = ExcelExportUtil.exportBigExcel(new ExportParams(null, "测试"), ExportEntity.class);

writer.write(entities);

Workbook workbook = writer.get();

// 获取工作簿

// ================= 结束输出 ==================

// 输出

responseWorkbook(response, workbook, "大数据导出.xlsx");

}

/**

* 导出 Excel

*

* @param response

* @param workbook

* @param fileName

*/

private static void responseWorkbook(HttpServletResponse response, Workbook workbook, String fileName) {

try {

response.setHeader("Content-disposition", "attachment;" + "filename*=utf-8''" + URLEncoder.encode(fileName, "UTF-8"));

response.setContentType("application/octet-stream; charset=UTF-8");

workbook.write(response.getOutputStream());

workbook.close();

} catch (IOException e) {

throw new RuntimeException(e);

}

}

结果:

完美~😎


方法二:在导入的方法中查数据

关键代码:ExcelExportUtil.exportBigExcel(ExportParams entity, Class<?> pojoClass,

IExcelExportServer server, Object queryParams);

entity:导出参数,还是基本导出的那两个,直接开 new

pojoClass:导出文件内容的类的字节码类型

server: 在这个 server 里面通过自身的业务层的分页逻辑去数据库获取大数据内容,比如通过mybatisPlus 的分页逻辑来获取内容数据

queryParams:server 分页查询内容的过滤条件

这种的导出效果和 方法一的导出效果是一样的,它利用的是 分页查询 来查的数据,大爷们可以看看下方链接,也挺好实现的💕(内心os:码不动了)

Easypoi-大数据量导出_easypoi 大数据导出-CSDN博客

【springboot+easypoi】大数据量excel导出 - 简书 (jianshu.com)



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