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0Sheet 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)@Datapublic 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)@Datapublic 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 */@Slf4jpublic 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**********************/}