easyExcel导出表格及合并单元格

前言

废话不多说，直接上效果图。

效果图

合并之前导出的：

合并之后导出的：

代码的实现主要是合并之后的，为了更好的分清数据之间的关系。

二、代码

目录 <只需要注意红色的>

easyExcel依赖

     <dependency><groupId>com.alibaba</groupId><artifactId>easyexcel</artifactId><version>2.2.6</version></dependency>

controller

package com.wondersgroup.easyexceldome.controller;import com.alibaba.excel.EasyExcel;
import com.alibaba.excel.support.ExcelTypeEnum;
import com.wondersgroup.easyexceldome.dto.BizMergeStrategy;
import com.wondersgroup.easyexceldome.dto.RowRangeDto;
import com.wondersgroup.easyexceldome.dto.TitleSheetWriteHandler;
import com.wondersgroup.easyexceldome.model.Student;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Map;/*** <p>* 该类的描述* </p>** @author* @Modified By:* @since 2020/11/23 11:31*/
@RestController
@RequestMapping("/user")
public class EasyExcelController {@GetMapping("/excel")public void excel(HttpServletResponse response) throws IOException {Map<String, List<RowRangeDto>> strategyMap = BizMergeStrategy.addAnnualMerStrategy(data());try {response.setContentType("application/vnd.ms-excel");response.setCharacterEncoding("utf-8");// 这里URLEncoder.encode可以防止中文乱码 当然和easyexcel没有关系String filename = URLEncoder.encode("用户表测试", "UTF-8").replaceAll("\\+", "%20");response.setHeader("Content-disposition", "attachment;filename=" + filename + ".xlsx");EasyExcel.write(response.getOutputStream(), Student.class).excelType(ExcelTypeEnum.XLSX).head(Student.class)//.registerWriteHandler(new TitleSheetWriteHandler("我是一个小标题",2)) // 标题及样式，lastCol为标题第0列到底lastCol列的宽度//设置默认样式及写入头信息开始的行数.relativeHeadRowIndex(1).registerWriteHandler(new BizMergeStrategy(strategyMap))    // 注册合并策略.registerWriteHandler(BizMergeStrategy.CellStyleStrategy()) // 设置样式.sheet("测试").doWrite(data());}catch (Exception e) {e.printStackTrace();response.reset();response.setCharacterEncoding("utf-8");response.setContentType("application/json");response.getWriter().println("打印失败");}}private List<Student> data(){List<Student> list=new ArrayList<>();Student student = new Student();//student.setId("1");student.setName("甲");student.setPhone("18102356548");student.setTime(new Date());student.setMom("XX科技有限公司");Student student2 = new Student();//student2.setId("2");student2.setName("甲");student2.setPhone("18978545213");student2.setTime(new Date());student2.setMom("XX科技有限公司");Student student3 = new Student();//student3.setId("3");student3.setName("甲");student3.setPhone("15369874563");student3.setTime(new Date());student3.setMom("XX科技有限公司");Student student4 = new Student();//student4.setId("4");student4.setName("乙");student4.setPhone("19433687456");student4.setTime(new Date());student4.setMom("XX科技有限公司");Student student5 = new Student();//student5.setId("5");student5.setName("乙");student5.setPhone("13815698745");student5.setTime(new Date());student5.setMom("XX科技有限公司");list.add(student);list.add(student2);list.add(student3);list.add(student4);list.add(student5);return list;}
}

实体类

package com.wondersgroup.easyexceldome.model;import com.alibaba.excel.annotation.ExcelProperty;
import com.alibaba.excel.annotation.write.style.ColumnWidth;
import lombok.Data;import java.util.Date;@Data
public class Student {/*@ColumnWidth(10)@ExcelProperty(value = {"id"}, index = 0)private String id;*/@ColumnWidth(20)@ExcelProperty(value = {"名字"}, index = 0)private String name;@ColumnWidth(20)@ExcelProperty(value = {"手机号"}, index = 1)private String phone;@ColumnWidth(20)@ExcelProperty(value = {"工作日期"}, index = 2)private Date time;@ColumnWidth(20)@ExcelProperty(value = {"工作单位"}, index = 3)private String mom;
}

合并策略和样式

package com.wondersgroup.easyexceldome.dto;import com.alibaba.excel.metadata.Head;
import com.alibaba.excel.write.merge.AbstractMergeStrategy;
import com.alibaba.excel.write.metadata.style.WriteCellStyle;
import com.alibaba.excel.write.metadata.style.WriteFont;
import com.alibaba.excel.write.style.HorizontalCellStyleStrategy;
import com.wondersgroup.easyexceldome.model.Student;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.util.CellRangeAddress;import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;/*** @description: 合并策略和样式* @author* @param* @since 2020/11/20 17:24* @Modified By:* @return*/
public class BizMergeStrategy extends AbstractMergeStrategy {private Map<String, List<RowRangeDto>> strategyMap;private Sheet sheet;public BizMergeStrategy(Map<String, List<RowRangeDto>> strategyMap) {this.strategyMap = strategyMap;}@Overrideprotected void merge(Sheet sheet, Cell cell, Head head, Integer integer) {this.sheet = sheet;//如果没有标题，只有表头的话，这里的 cell.getRowIndex() == 1if (cell.getRowIndex() == 2 && cell.getColumnIndex() == 0) {/*** 保证每个cell被合并一次，如果不加上面的判断，因为是一个cell一个cell操作的，* 例如合并A2:A3,当cell为A2时，合并A2,A3，但是当cell为A3时，又是合并A2,A3，* 但此时A2,A3已经是合并的单元格了*/for (Map.Entry<String, List<RowRangeDto>> entry : strategyMap.entrySet()) {Integer columnIndex = Integer.valueOf(entry.getKey());entry.getValue().forEach(rowRange -> {//添加一个合并请求sheet.addMergedRegionUnsafe(new CellRangeAddress(rowRange.getStart(),rowRange.getEnd(), columnIndex, columnIndex));});}}}public static Map<String, List<RowRangeDto>> addAnnualMerStrategy(List<Student> projectDtoList) {Map<String, List<RowRangeDto>> strategyMap = new HashMap<>();Student preUser = null;for (int i = 0; i < projectDtoList.size(); i++) {Student curUser = projectDtoList.get(i);//如果名字一样，将名字合并（真正开发中一般不会通过名字这样字段，而是通过一些关联的唯一值，比如父id）if (preUser != null) {if (curUser.getName() == preUser.getName()){    // 名字相同则合并第一列
//                    BizMergeStrategy.fillStrategyMap(strategyMap, "0", i+1);//如果没有标题，只有表头的话，这里为 BizMergeStrategy.fillStrategyMap(strategyMap, "1", i);BizMergeStrategy.fillStrategyMap(strategyMap, "0", i+1);}}preUser = curUser;}return strategyMap;}/*** @description: 新增或修改合并策略map* @author* @param strategyMap* @param key* @param index* @since 2020/11/17 17:32* @Modified By:* @return*/private static void fillStrategyMap(Map<String, List<RowRangeDto>> strategyMap, String key, int index){List<RowRangeDto> rowRangeDtoList = strategyMap.get(key) == null ? new ArrayList<>() : strategyMap.get(key);boolean flag = false;for (RowRangeDto dto : rowRangeDtoList) {//分段list中是否有end索引是上一行索引的，如果有，则索引+1if (dto.getEnd() == index) {dto.setEnd(index + 1);flag = true;}}//如果没有，则新增分段if (!flag) {rowRangeDtoList.add(new RowRangeDto(index, index + 1));}strategyMap.put(key, rowRangeDtoList);}/*** @description: 表格样式* @author* @since 2020/11/20 9:40* @Modified By:* @return*/public static HorizontalCellStyleStrategy CellStyleStrategy(){WriteCellStyle headWriteCellStyle = new WriteCellStyle();//设置背景颜色headWriteCellStyle.setFillForegroundColor(IndexedColors.WHITE.getIndex());//设置头字体WriteFont headWriteFont = new WriteFont();headWriteFont.setFontHeightInPoints((short)13);headWriteFont.setBold(true);headWriteCellStyle.setWriteFont(headWriteFont);//设置头居中headWriteCellStyle.setHorizontalAlignment(HorizontalAlignment.CENTER);//内容策略WriteCellStyle contentWriteCellStyle = new WriteCellStyle();//设置 水平居中contentWriteCellStyle.setHorizontalAlignment(HorizontalAlignment.CENTER);contentWriteCellStyle.setVerticalAlignment(VerticalAlignment.CENTER);HorizontalCellStyleStrategy horizontalCellStyleStrategy = new HorizontalCellStyleStrategy(headWriteCellStyle, contentWriteCellStyle);return horizontalCellStyleStrategy;}
}

RowRangeDto

package com.wondersgroup.easyexceldome.dto;public class RowRangeDto {private int start;private int end;public RowRangeDto(int start,int end){this.start = start;this.end = end;}public int getStart() {return start;}public void setStart(int start) {this.start = start;}public int getEnd() {return end;}public void setEnd(int end) {this.end = end;}
}

TitleSheetWriteHandler

package com.wondersgroup.easyexceldome.dto;import com.alibaba.excel.write.handler.SheetWriteHandler;
import com.alibaba.excel.write.metadata.holder.WriteSheetHolder;
import com.alibaba.excel.write.metadata.holder.WriteWorkbookHolder;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.util.CellRangeAddress;public class TitleSheetWriteHandler implements SheetWriteHandler {private String title;private int lastCol;public TitleSheetWriteHandler(String title,int lastCol){this.title = title;this.lastCol = lastCol;}@Overridepublic void beforeSheetCreate(WriteWorkbookHolder writeWorkbookHolder, WriteSheetHolder writeSheetHolder) {}@Overridepublic void afterSheetCreate(WriteWorkbookHolder writeWorkbookHolder, WriteSheetHolder writeSheetHolder) {Workbook workbook = writeWorkbookHolder.getWorkbook();Sheet sheet = workbook.getSheetAt(0);//设置标题Row row = sheet.createRow(0);row.setHeight((short) 800);Cell cell = row.createCell(0);cell.setCellValue(title);CellStyle cellStyle = workbook.createCellStyle();cellStyle.setVerticalAlignment(VerticalAlignment.CENTER);cellStyle.setAlignment(HorizontalAlignment.CENTER);Font font = workbook.createFont();font.setBold(true);font.setFontHeight((short) 400);cellStyle.setFont(font);cell.setCellStyle(cellStyle);sheet.addMergedRegionUnsafe(new CellRangeAddress(0, 0, 0, lastCol));}
}

启动类

package com.wondersgroup.easyexceldome;import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplication
public class EasyexceldomeApplication {public static void main(String[] args) {SpringApplication.run(EasyexceldomeApplication.class, args);}}

application.properties

server.port=9090

总结

新建个项目，直接拷贝代码运行即可。

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easyExcel导出表格及合并单元格

easyExcel导出表格及合并单元格

前言

效果图

二、代码

总结

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