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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
** 注 意 **
** 文末有：7701 页互联网大厂面试题 **
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 的全副数据
String filePath = "/home/chenmingjian/Downloads/ 学生表.xlsx";
List<Object> objects = ExcelUtil.readLessThan1000Row(filePath);
指定读取
上面是学生表.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);
后果
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 示意第一列
*/
@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、调用办法
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 示意第一列
*/
@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、调用办法
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, 带款式
* 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, 示意从第一行开始读取
* 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("找不到文件或文件门路谬误, 文件：{}", filePath);
}finally {
try {if(fileStream != null){fileStream.close();
}
} catch (IOException e) {log.info("excel 文件读取失败, 失败起因：{}", e);
}
}
return null;
}
/**
* 读大于 1000 行数据
* @param filePath 文件感觉门路
* @return
*/
public static List<Object> readMoreThan1000Row(String filePath){return readMoreThan1000RowBySheet(filePath,null);
}
/**
* 读大于 1000 行数据, 带款式
* @param filePath 文件感觉门路
* @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("找不到文件或文件门路谬误, 文件：{}", filePath);
}finally {
try {if(fileStream != null){fileStream.close();
}
} catch (IOException e) {log.error("excel 文件读取失败, 失败起因：{}", 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 页面款式
* @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("找不到文件或文件门路谬误, 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, 失败起因：{}", 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 页面款式
*/
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("找不到文件或文件门路谬误, 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, 失败起因：{}", 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("找不到文件或文件门路谬误, 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, 失败起因：{}", e);
}
}
}
/********************* 匿名外部类开始，能够提取进来 ******************************/
@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() 办法。* 整个 excel 解析完结会执行 doAfterAllAnalysed() 办法
*
* @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 : 以后行的数据
*/
@Override
public void invoke(Object object, AnalysisContext context) {
// 以后行
// context.getCurrentRowNum()
if (object != null) {datas.add(object);
}
}
/**
* 解析完所有数据后会调用该办法
*/
@Override
public void doAfterAllAnalysed(AnalysisContext context) {// 解析完结销毁不必的资源}
}
/************************ 匿名外部类完结，能够提取进来 ***************************/
}
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.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，能够指定 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 参数的办法可参照测试方法 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 参数的办法可参照测试方法 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 参数的办法可参照测试方法 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);
}
/******************* 匿名外部类，理论开发中该对象要提取进来 **********************/
/**
* @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 示意第一列
*/
@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;
}
/******************* 匿名外部类，理论开发中该对象要提取进来 **********************/
}正文完