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来源：blog.csdn.net/qq_32258777/article/details/89031479

喝水不忘挖井人，感谢阿里巴巴项目组提供了easyexcel工具类，github地址：

https://github.com/alibaba/easyexcel

文章目录

• 环境搭建

• 读取excel文件

  • 默认读取

  • 指定读取

  • 默认读取

  • 指定读取

  • 小于1000行数据

  • 大于1000行数据

• 导出excle

  • 无模型映射导出

  • 模型映射导出

  • 单个Sheet导出

  • 多个Sheet导出

• 工具类

• 测试类

环境搭建

• easyexcel 依赖（必须）

• springboot (不是必须)

• lombok （不是必须）

<dependency><groupId>com.alibaba</groupId><artifactId>easyexcel</artifactId><version>1.1.2-beat1</version></dependency><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><version>1.18.2</version></dependency>

读取excel文件

小于1000行数据

默认读取

读取Sheet1的全部数据

String filePath = "/home/chenmingjian/Downloads/学生表.xlsx";List<Object> objects = ExcelUtil.readLessThan1000Row(filePath);

指定读取

下面是学生表.xlsx中Sheet1，Sheet2的数据

获取Sheet1表头以下的信息

String filePath = "/home/chenmingjian/Downloads/学生表.xlsx";
//第一个1代表sheet1, 第二个1代表从第几行开始读取数据，行号最小值为0
Sheet sheet = new Sheet(1, 1);
List<Object> objects = ExcelUtil.readLessThan1000Row(filePath,sheet);

获取Sheet2的所有信息

String filePath = "/home/chenmingjian/Downloads/学生表.xlsx";Sheet sheet = new Sheet(2, 0);List<Object> objects = ExcelUtil.readLessThan1000Row(filePath,sheet);

大于1000行数据

默认读取

String filePath = "/home/chenmingjian/Downloads/学生表.xlsx";
List<Object> objects = ExcelUtil.readMoreThan1000Row(filePath);

指定读取

String filePath = "/home/chenmingjian/Downloads/学生表.xlsx";
Sheet sheet = new Sheet(1, 2);
List<Object> objects = ExcelUtil.readMoreThan1000Row(filePath，sheet);

导出excle

单个Sheet导出

无模型映射导出

String filePath = "/home/chenmingjian/Downloads/测试.xlsx";
List<List<Object>> data = new ArrayList<>();
data.add(Arrays.asList("111","222","333"));
data.add(Arrays.asList("111","222","333"));
data.add(Arrays.asList("111","222","333"));
List<String> head = Arrays.asList("表头1", "表头2", "表头3");
ExcelUtil.writeBySimple(filePath,data,head);

结果

模型映射导出

1、定义好模型对象

package com.springboot.utils.excel.test;import com.alibaba.excel.annotation.ExcelProperty;
import com.alibaba.excel.metadata.BaseRowModel;
import lombok.Data;
import lombok.EqualsAndHashCode;/*** @description:* @author: chenmingjian* @date: 19-4-3 14:44*/
@EqualsAndHashCode(callSuper = true)
@Data
public class TableHeaderExcelProperty extends BaseRowModel {/*** value: 表头名称* index: 列的号, 0表示第一列*/@ExcelProperty(value = "姓名", index = 0)private String name;@ExcelProperty(value = "年龄",index = 1)private int age;@ExcelProperty(value = "学校",index = 2)private String school;
}

2、调用方法

String filePath = "/home/chenmingjian/Downloads/测试.xlsx";
ArrayList<TableHeaderExcelProperty> data = new ArrayList<>();for(int i = 0; i < 4; i++){TableHeaderExcelProperty tableHeaderExcelProperty = new TableHeaderExcelProperty();tableHeaderExcelProperty.setName("cmj" + i);tableHeaderExcelProperty.setAge(22 + i);tableHeaderExcelProperty.setSchool("清华大学" + i);data.add(tableHeaderExcelProperty);}ExcelUtil.writeWithTemplate(filePath,data);

多个Sheet导出

1、定义好模型对象

package com.springboot.utils.excel.test;import com.alibaba.excel.annotation.ExcelProperty;
import com.alibaba.excel.metadata.BaseRowModel;
import lombok.Data;
import lombok.EqualsAndHashCode;/*** @description:* @author: chenmingjian* @date: 19-4-3 14:44*/
@EqualsAndHashCode(callSuper = true)
@Data
public class TableHeaderExcelProperty extends BaseRowModel {/*** value: 表头名称* index: 列的号, 0表示第一列*/@ExcelProperty(value = "姓名", index = 0)private String name;@ExcelProperty(value = "年龄",index = 1)private int age;@ExcelProperty(value = "学校",index = 2)private String school;
}

2、调用方法

ArrayList<ExcelUtil.MultipleSheelPropety> list1 = new ArrayList<>();for(int j = 1; j < 4; j++){ArrayList<TableHeaderExcelProperty> list = new ArrayList<>();for(int i = 0; i < 4; i++){TableHeaderExcelProperty tableHeaderExcelProperty = new TableHeaderExcelProperty();tableHeaderExcelProperty.setName("cmj" + i);tableHeaderExcelProperty.setAge(22 + i);tableHeaderExcelProperty.setSchool("清华大学" + i);list.add(tableHeaderExcelProperty);}Sheet sheet = new Sheet(j, 0);sheet.setSheetName("sheet" + j);ExcelUtil.MultipleSheelPropety multipleSheelPropety = new ExcelUtil.MultipleSheelPropety();multipleSheelPropety.setData(list);multipleSheelPropety.setSheet(sheet);list1.add(multipleSheelPropety);}ExcelUtil.writeWithMultipleSheel("/home/chenmingjian/Downloads/aaa.xlsx",list1);

工具类

package com.springboot.utils.excel;import com.alibaba.excel.EasyExcelFactory;
import com.alibaba.excel.ExcelWriter;
import com.alibaba.excel.context.AnalysisContext;
import com.alibaba.excel.event.AnalysisEventListener;
import com.alibaba.excel.metadata.BaseRowModel;
import com.alibaba.excel.metadata.Sheet;
import lombok.Data;
import lombok.Getter;
import lombok.Setter;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.CollectionUtils;
import org.springframework.util.StringUtils;import java.io.*;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;/*** @description:* @author: chenmingjian* @date: 19-3-18 16:16*/
@Slf4j
public class ExcelUtil {private static Sheet initSheet;static {initSheet = new Sheet(1, 0);initSheet.setSheetName("sheet");//设置自适应宽度initSheet.setAutoWidth(Boolean.TRUE);}/*** 读取少于1000行数据* @param filePath 文件绝对路径* @return*/public static List<Object> readLessThan1000Row(String filePath){return readLessThan1000RowBySheet(filePath,null);}/*** 读小于1000行数据, 带样式* filePath 文件绝对路径* initSheet ：*      sheetNo: sheet页码，默认为1*      headLineMun: 从第几行开始读取数据，默认为0, 表示从第一行开始读取*      clazz: 返回数据List<Object> 中Object的类名*/public static List<Object> readLessThan1000RowBySheet(String filePath, Sheet sheet){if(!StringUtils.hasText(filePath)){return null;}sheet = sheet != null ? sheet : initSheet;InputStream fileStream = null;try {fileStream = new FileInputStream(filePath);return EasyExcelFactory.read(fileStream, sheet);} catch (FileNotFoundException e) {log.info("找不到文件或文件路径错误, 文件：{}", filePath);}finally {try {if(fileStream != null){fileStream.close();}} catch (IOException e) {log.info("excel文件读取失败, 失败原因：{}", e);}}return null;}/*** 读大于1000行数据* @param filePath 文件觉得路径* @return*/public static List<Object> readMoreThan1000Row(String filePath){return readMoreThan1000RowBySheet(filePath,null);}/*** 读大于1000行数据, 带样式* @param filePath 文件觉得路径* @return*/public static List<Object> readMoreThan1000RowBySheet(String filePath, Sheet sheet){if(!StringUtils.hasText(filePath)){return null;}sheet = sheet != null ? sheet : initSheet;InputStream fileStream = null;try {fileStream = new FileInputStream(filePath);ExcelListener excelListener = new ExcelListener();EasyExcelFactory.readBySax(fileStream, sheet, excelListener);return excelListener.getDatas();} catch (FileNotFoundException e) {log.error("找不到文件或文件路径错误, 文件：{}", filePath);}finally {try {if(fileStream != null){fileStream.close();}} catch (IOException e) {log.error("excel文件读取失败, 失败原因：{}", e);}}return null;}/*** 生成excle* @param filePath  绝对路径, 如：/home/chenmingjian/Downloads/aaa.xlsx* @param data 数据源* @param head 表头*/public static void writeBySimple(String filePath, List<List<Object>> data, List<String> head){writeSimpleBySheet(filePath,data,head,null);}/*** 生成excle* @param filePath 绝对路径, 如：/home/chenmingjian/Downloads/aaa.xlsx* @param data 数据源* @param sheet excle页面样式* @param head 表头*/public static void writeSimpleBySheet(String filePath, List<List<Object>> data, List<String> head, Sheet sheet){sheet = (sheet != null) ? sheet : initSheet;if(head != null){List<List<String>> list = new ArrayList<>();head.forEach(h -> list.add(Collections.singletonList(h)));sheet.setHead(list);}OutputStream outputStream = null;ExcelWriter writer = null;try {outputStream = new FileOutputStream(filePath);writer = EasyExcelFactory.getWriter(outputStream);writer.write1(data,sheet);} catch (FileNotFoundException e) {log.error("找不到文件或文件路径错误, 文件：{}", filePath);}finally {try {if(writer != null){writer.finish();}if(outputStream != null){outputStream.close();}} catch (IOException e) {log.error("excel文件导出失败, 失败原因：{}", e);}}}/*** 生成excle* @param filePath 绝对路径, 如：/home/chenmingjian/Downloads/aaa.xlsx* @param data 数据源*/public static void writeWithTemplate(String filePath, List<? extends BaseRowModel> data){writeWithTemplateAndSheet(filePath,data,null);}/*** 生成excle* @param filePath 绝对路径, 如：/home/chenmingjian/Downloads/aaa.xlsx* @param data 数据源* @param sheet excle页面样式*/public static void writeWithTemplateAndSheet(String filePath, List<? extends BaseRowModel> data, Sheet sheet){if(CollectionUtils.isEmpty(data)){return;}sheet = (sheet != null) ? sheet : initSheet;sheet.setClazz(data.get(0).getClass());OutputStream outputStream = null;ExcelWriter writer = null;try {outputStream = new FileOutputStream(filePath);writer = EasyExcelFactory.getWriter(outputStream);writer.write(data,sheet);} catch (FileNotFoundException e) {log.error("找不到文件或文件路径错误, 文件：{}", filePath);}finally {try {if(writer != null){writer.finish();}if(outputStream != null){outputStream.close();}} catch (IOException e) {log.error("excel文件导出失败, 失败原因：{}", e);}}}/*** 生成多Sheet的excle* @param filePath 绝对路径, 如：/home/chenmingjian/Downloads/aaa.xlsx* @param multipleSheelPropetys*/public static void writeWithMultipleSheel(String filePath,List<MultipleSheelPropety> multipleSheelPropetys){if(CollectionUtils.isEmpty(multipleSheelPropetys)){return;}OutputStream outputStream = null;ExcelWriter writer = null;try {outputStream = new FileOutputStream(filePath);writer = EasyExcelFactory.getWriter(outputStream);for (MultipleSheelPropety multipleSheelPropety : multipleSheelPropetys) {Sheet sheet = multipleSheelPropety.getSheet() != null ? multipleSheelPropety.getSheet() : initSheet;if(!CollectionUtils.isEmpty(multipleSheelPropety.getData())){sheet.setClazz(multipleSheelPropety.getData().get(0).getClass());}writer.write(multipleSheelPropety.getData(), sheet);}} catch (FileNotFoundException e) {log.error("找不到文件或文件路径错误, 文件：{}", filePath);}finally {try {if(writer != null){writer.finish();}if(outputStream != null){outputStream.close();}} catch (IOException e) {log.error("excel文件导出失败, 失败原因：{}", e);}}}/*********************匿名内部类开始，可以提取出去******************************/@Datapublic static class MultipleSheelPropety{private List<? extends BaseRowModel> data;private Sheet sheet;}/*** 解析监听器，* 每解析一行会回调invoke()方法。* 整个excel解析结束会执行doAfterAllAnalysed()方法** @author: chenmingjian* @date: 19-4-3 14:11*/@Getter@Setterpublic static class ExcelListener extends AnalysisEventListener {private List<Object> datas = new ArrayList<>();/*** 逐行解析* object : 当前行的数据*/@Overridepublic void invoke(Object object, AnalysisContext context) {//当前行// context.getCurrentRowNum()if (object != null) {datas.add(object);}}/*** 解析完所有数据后会调用该方法*/@Overridepublic void doAfterAllAnalysed(AnalysisContext context) {//解析结束销毁不用的资源}}/************************匿名内部类结束，可以提取出去***************************/}

测试类

package com.springboot.utils.excel;import com.alibaba.excel.annotation.ExcelProperty;
import com.alibaba.excel.metadata.BaseRowModel;
import com.alibaba.excel.metadata.Sheet;
import lombok.Data;
import lombok.EqualsAndHashCode;
import org.junit.runner.RunWith;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;/*** @description: 测试类* @author: chenmingjian* @date: 19-4-4 15:24*/
@SpringBootTest
@RunWith(SpringRunner.class)
public class Test {/*** 读取少于1000行的excle*/@org.junit.Testpublic void readLessThan1000Row(){String filePath = "/home/chenmingjian/Downloads/测试.xlsx";List<Object> objects = ExcelUtil.readLessThan1000Row(filePath);objects.forEach(System.out::println);}/*** 读取少于1000行的excle，可以指定sheet和从几行读起*/@org.junit.Testpublic void readLessThan1000RowBySheet(){String filePath = "/home/chenmingjian/Downloads/测试.xlsx";Sheet sheet = new Sheet(1, 1);List<Object> objects = ExcelUtil.readLessThan1000RowBySheet(filePath,sheet);objects.forEach(System.out::println);}/*** 读取大于1000行的excle* 带sheet参数的方法可参照测试方法readLessThan1000RowBySheet()*/@org.junit.Testpublic void readMoreThan1000Row(){String filePath = "/home/chenmingjian/Downloads/测试.xlsx";List<Object> objects = ExcelUtil.readMoreThan1000Row(filePath);objects.forEach(System.out::println);}/*** 生成excle* 带sheet参数的方法可参照测试方法readLessThan1000RowBySheet()*/@org.junit.Testpublic void writeBySimple(){String filePath = "/home/chenmingjian/Downloads/测试.xlsx";List<List<Object>> data = new ArrayList<>();data.add(Arrays.asList("111","222","333"));data.add(Arrays.asList("111","222","333"));data.add(Arrays.asList("111","222","333"));List<String> head = Arrays.asList("表头1", "表头2", "表头3");ExcelUtil.writeBySimple(filePath,data,head);}/*** 生成excle, 带用模型* 带sheet参数的方法可参照测试方法readLessThan1000RowBySheet()*/@org.junit.Testpublic void writeWithTemplate(){String filePath = "/home/chenmingjian/Downloads/测试.xlsx";ArrayList<TableHeaderExcelProperty> data = new ArrayList<>();for(int i = 0; i < 4; i++){TableHeaderExcelProperty tableHeaderExcelProperty = new TableHeaderExcelProperty();tableHeaderExcelProperty.setName("cmj" + i);tableHeaderExcelProperty.setAge(22 + i);tableHeaderExcelProperty.setSchool("清华大学" + i);data.add(tableHeaderExcelProperty);}ExcelUtil.writeWithTemplate(filePath,data);}/*** 生成excle, 带用模型,带多个sheet*/@org.junit.Testpublic void writeWithMultipleSheel(){ArrayList<ExcelUtil.MultipleSheelPropety> list1 = new ArrayList<>();for(int j = 1; j < 4; j++){ArrayList<TableHeaderExcelProperty> list = new ArrayList<>();for(int i = 0; i < 4; i++){TableHeaderExcelProperty tableHeaderExcelProperty = new TableHeaderExcelProperty();tableHeaderExcelProperty.setName("cmj" + i);tableHeaderExcelProperty.setAge(22 + i);tableHeaderExcelProperty.setSchool("清华大学" + i);list.add(tableHeaderExcelProperty);}Sheet sheet = new Sheet(j, 0);sheet.setSheetName("sheet" + j);ExcelUtil.MultipleSheelPropety multipleSheelPropety = new ExcelUtil.MultipleSheelPropety();multipleSheelPropety.setData(list);multipleSheelPropety.setSheet(sheet);list1.add(multipleSheelPropety);}ExcelUtil.writeWithMultipleSheel("/home/chenmingjian/Downloads/aaa.xlsx",list1);}/*******************匿名内部类，实际开发中该对象要提取出去**********************//*** @description:* @author: chenmingjian* @date: 19-4-3 14:44*/@EqualsAndHashCode(callSuper = true)@Datapublic static class TableHeaderExcelProperty extends BaseRowModel {/*** value: 表头名称* index: 列的号, 0表示第一列*/@ExcelProperty(value = "姓名", index = 0)private String name;@ExcelProperty(value = "年龄",index = 1)private int age;@ExcelProperty(value = "学校",index = 2)private String school;}/*******************匿名内部类，实际开发中该对象要提取出去**********************/}

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