Java通过EasyExcel生成excel文件(多个sheet)、列合并

目录

1、添加依赖

2、实体类

2.1 操作日志

2.2 用户信息

3、测试的excel数据文件

3.1 用户信息excel

3.2 操作日志excel

4、excel列合并工具类

5、调用方

---

1、添加依赖

	com.alibaba
	fastjson
	1.2.3


            org.apache.poi
            poi-ooxml
            3.17
        

2、实体类

2.1 操作日志

package com.shucha.deveiface.biz.test;

import com.alibaba.excel.annotation.ExcelProperty;
import com.alibaba.excel.annotation.format.DateTimeFormat;
import com.alibaba.excel.annotation.write.style.ColumnWidth;
import lombok.Data;

/**
 * @author tqf
 * @Description
 * @Version 1.0
 * @since 2022-01-18 15:03
 */
@Data

public class Log {

    /**
     * 日志名称
     */
    @ColumnWidth(20)
    @ExcelProperty(value = "日志名称", index = 0)
    // @ExcelProperty(value = {"资源基本信息", "序号"},index = 0)
    private String logName;

    /**
     * 日志时间
     */
    @ColumnWidth(20)
    @ExcelProperty(value = "日志时间", index = 1)
    @DateTimeFormat("yyyy-MM-dd HH:mm:ss")
    private String date;

    /**
     * 字段名
     */
    @ColumnWidth(20)
    @ExcelProperty(value = "字段名", index = 2)
    private String fieldName;

    /**
     * 字段描述
     */
    @ColumnWidth(20)
    @ExcelProperty(value = "字段描述", index = 3)
    private String fieldDesc;

    /**
     * 字段值
     */
    @ColumnWidth(20)
    @ExcelProperty(value = "字段值", index = 4)
    private String fieldValue;
}

2.2 用户信息

package com.shucha.deveiface.biz.test;

import com.alibaba.excel.annotation.ExcelProperty;
import com.alibaba.excel.annotation.write.style.HeadStyle;
import lombok.Data;
import org.apache.poi.ss.usermodel.FillPatternType;

/**
 * @author tqf
 * @Description
 * @Version 1.0
 * @since 2022-01-18 14:09
 */
@Data
public class User {

    /**
     * 姓名
     */
    // 字符串的头背景设置成粉红 IndexedColors.PINK.getIndex() 设置标题的背景颜色
    @HeadStyle(fillPatternType = FillPatternType.SOLID_FOREGROUND, fillForegroundColor = 14)
    @ExcelProperty(value = "姓名", index = 0)
    private String name;

    /**
     * 年龄
     */
    // 字符串的头背景设置成粉红 IndexedColors.PINK.getIndex() 设置标题的背景颜色
    @HeadStyle(fillPatternType = FillPatternType.SOLID_FOREGROUND, fillForegroundColor = 13)
    @ExcelProperty(value = "年龄", index = 1)
    private String age;
}

3、测试的excel数据文件

3.1 用户信息excel

姓名	年龄
王海	35
谭杰	12
王娟	25

3.2 操作日志excel

日志名称	日志时间	字段名	字段描述	字段值
根据ID查询详情	2021-01-13	size	条数	25
根据ID查询详情	2021-01-13	page	页码	21
根据ID查询详情	2021-01-13	total	总数	25
获取日志列表	2021-01-12	logName	日志名称	查询
获取日志列表	2021-01-12	logTime	日志时间	2021-10-01 14:25:14
获取日志列表	2021-01-12	logUser	查询人姓名	王杰
查询用户信息	2021-01-11	userName	用户名	tqf_123
查询用户信息	2021-01-11	age	年龄	25
查询用户信息	2021-01-11	sex	性别(0-男，1-女，2-未知)	0

4、excel列合并工具类

package com.shucha.deveiface.biz.test;

import com.alibaba.excel.metadata.CellData;
import com.alibaba.excel.metadata.Head;
import com.alibaba.excel.write.handler.CellWriteHandler;
import com.alibaba.excel.write.metadata.holder.WriteSheetHolder;
import com.alibaba.excel.write.metadata.holder.WriteTableHolder;
import lombok.Data;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellType;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.util.CellRangeAddress;

import java.util.List;

/**
 * 单元格合并
 *
 * @author
 * @date
 */
@Data
public class ExcelFillCellMergeStrategy implements CellWriteHandler {
    /**
     * 合并字段的下标
     */
    private int[] mergeColumnIndex;
    /**
     * 合并几行
     */
    private int mergeRowIndex;

    public ExcelFillCellMergeStrategy() {
    }

    public ExcelFillCellMergeStrategy(int mergeRowIndex, int[] mergeColumnIndex) {
        this.mergeRowIndex = mergeRowIndex;
        this.mergeColumnIndex = mergeColumnIndex;
    }

    @Override
    public void beforeCellCreate(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, Row row,
                                 Head head, Integer integer, Integer integer1, Boolean aBoolean) {

    }

    @Override
    public void afterCellCreate(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, Cell cell,
                                Head head, Integer integer, Boolean aBoolean) {

    }

    @Override
    public void afterCellDataConverted(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder,
                                       CellData cellData, Cell cell, Head head, Integer integer, Boolean aBoolean) {

    }

    @Override
    public void afterCellDispose(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder,
                                 List list, Cell cell, Head head, Integer integer, Boolean aBoolean) {
        //当前行
        int curRowIndex = cell.getRowIndex();
        //当前列
        int curColIndex = cell.getColumnIndex();

        if (curRowIndex > mergeRowIndex) {
            for (int i = 0; i < mergeColumnIndex.length; i++) {
                if (curColIndex == mergeColumnIndex[i]) {
                    mergeWithPrevRow(writeSheetHolder, cell, curRowIndex, curColIndex);
                    break;
                }
            }
        }
    }

    private void mergeWithPrevRow(WriteSheetHolder writeSheetHolder, Cell cell, int curRowIndex, int curColIndex) {
        //获取当前行的当前列的数据和上一行的当前列列数据，通过上一行数据是否相同进行合并
        Object curData = cell.getCellTypeEnum() == CellType.STRING ? cell.getStringCellValue() :
                cell.getNumericCellValue();
        Cell preCell = cell.getSheet().getRow(curRowIndex - 1).getCell(curColIndex);
        Object preData = preCell.getCellTypeEnum() == CellType.STRING ? preCell.getStringCellValue() :
                preCell.getNumericCellValue();
        // 比较当前行的第一列的单元格与上一行是否相同，相同合并当前单元格与上一行
        //
        if (curData.equals(preData)) {
            Sheet sheet = writeSheetHolder.getSheet();
            List mergeRegions = sheet.getMergedRegions();
            boolean isMerged = false;
            for (int i = 0; i < mergeRegions.size() && !isMerged; i++) {
                CellRangeAddress cellRangeAddr = mergeRegions.get(i);
                // 若上一个单元格已经被合并，则先移出原有的合并单元，再重新添加合并单元
                if (cellRangeAddr.isInRange(curRowIndex - 1, curColIndex)) {
                    sheet.removeMergedRegion(i);
                    cellRangeAddr.setLastRow(curRowIndex);
                    sheet.addMergedRegion(cellRangeAddr);
                    isMerged = true;
                }
            }
            // 若上一个单元格未被合并，则新增合并单元
            if (!isMerged) {
                CellRangeAddress cellRangeAddress = new CellRangeAddress(curRowIndex - 1, curRowIndex, curColIndex,
                        curColIndex);
                sheet.addMergedRegion(cellRangeAddress);
            }
        }
    }
}

5、调用方

package com.shucha.deveiface.biz.test;

import com.alibaba.excel.EasyExcel;
import com.alibaba.excel.ExcelWriter;
import com.alibaba.excel.write.metadata.WriteSheet;
import lombok.extern.slf4j.Slf4j;

import javax.servlet.ServletOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

/**
 * @author tqf
 * @Description 生成excel文件，多个sheet写入数据
 * @Version 1.0
 * @since 2022-07-11 10:16
 */
@Slf4j
public class MoreExcelSheet {
    // 生成的文件路径和名称
    private static File file = new File("D:/Excel多个sheet.xls");

    public static void main(String[] args) throws IOException {
        // 日志列表数据
        List dtoList = getData();
        // 用户信息列表数据
        List userList = getUserData();

        String sheetName[] = {"操作日志","用户信息"};

        // sheet的对象class
        List classArray = new ArrayList<>();
        classArray.add(Log.class);
        classArray.add(User.class);

        //需要合并的列
        int[] mergeColumeIndex = {0,1};
        // 从第二行后开始合并
        int mergeRowIndex = 1;

        //不存在则新增
        if(!file.getParentFile().exists()){
            file.getParentFile().mkdirs();
        }
        if(!file.exists()){
            file.createNewFile();
        }
        FileOutputStream output = new FileOutputStream(file);
        // ServletOutputStream output = response.getOutputStream();
        ExcelWriter excelWriter = EasyExcel.write(output).build();
        for (int i=0;i getData(){
        String fileName = "D:/log1.xls";
        // 这里 需要指定读用哪个class去读，然后读取第一个sheet 同步读取会自动finish
        List list = EasyExcel.read(fileName).head(Log.class).sheet().doReadSync();
        return list;
    }

    public static List getUserData(){
        String userPath = "D:/123.xls";
        List userList = EasyExcel.read(userPath).head(User.class).sheet().doReadSync();
        return userList;
    }
/**
     * 1万条数据写入多个sheet
     * @throws IOException
     */
    public static void moreSheet() throws IOException {
        List userList = getUserData();

        FileOutputStream output = new FileOutputStream(file);
        // ServletOutputStream output = response.getOutputStream();
        ExcelWriter excelWriter = EasyExcel.write(output).build();

        // 每个sheet写入的数据量
        int len = 2000;
        // 总的数据量
        int size = userList.size();
        // 多少个sheet
        int count = (size + len - 1) / len;
        for (int i = 0; i < count; i++) {
            List dataList = userList.subList(i * len, ((i + 1) * len > size ? size : len * (i + 1)));
            WriteSheet writeSheet;
            writeSheet = EasyExcel.writerSheet(i, "sheet"+(i+1)+"")
                    .head(User.class)
                    .build();
            excelWriter.write(dataList, writeSheet);
        }
        //千万别忘记finish 会帮忙关闭流
        excelWriter.finish();
        output.flush();
    }
}

生成文件截图如下：