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>
Spring Boot 基础就不介绍了，推荐下这个实战教程：
https://github.com/javastacks/spring-boot-best-practice
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******************************/
@Data
public 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
@Setter
public static class ExcelListener extends AnalysisEventListener {
private List<Object> datas = new ArrayList<>();
/**
* 逐行解析
* object : 当前行的数据
*/
@Override
public 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
*/
@Override
public 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
Spring Boot 基础就不介绍了，推荐下这个实战教程：
https://github.com/javastacks/spring-boot-best-practice
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.Test
public 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.Test
public 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.Test
public 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.Test
public 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.Test
public 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.Test
public 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)
@Data
public 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**********************/
}
