四、EasyExcel自定义导出样式

一、概述

EasyExcel做导入导出都很简单,但修改excel的样式却有很多小伙伴不太了解,其实也不是很难,跟Apache POI的样式设置差不多,今天结合实例给同学们分享一下

二、实例

现在我想导出这种效果,表头和表行都有部分字段为红色,如下图

excel样式

2.1 编写样式处理类

3.1 表头样式处理类

import com.alibaba.excel.metadata.CellData;
import com.alibaba.excel.metadata.Head;
import com.alibaba.excel.util.StyleUtil;
import com.alibaba.excel.write.handler.CellWriteHandler;
import com.alibaba.excel.write.metadata.holder.WriteSheetHolder;
import com.alibaba.excel.write.metadata.holder.WriteTableHolder;
import com.alibaba.excel.write.metadata.style.WriteCellStyle;
import com.alibaba.excel.write.metadata.style.WriteFont;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.collections4.CollectionUtils;
import org.apache.poi.ss.usermodel.*;
import java.util.List;
@Slf4j
public class TitleColorSheetWriteHandler implements CellWriteHandler {

    //操作行
    private List<Integer> columnIndexs;
    //操作列
    private List<Integer> rowIndexs;
    //颜色
    private Short colorIndex;

    //构造
    public TitleColorSheetWriteHandler(List<Integer> rowIndexs, List<Integer> columnIndexs, Short colorIndex) {
        this.rowIndexs = rowIndexs;
        this.columnIndexs = columnIndexs;
        this.colorIndex = colorIndex;
    }

    public TitleColorSheetWriteHandler() {
    }

    @Override
    public void beforeCellCreate(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, Row row, Head head, Integer columnIndex, Integer relativeRowIndex, Boolean isHead) {
    }

    @Override
    public void afterCellCreate(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, Cell cell, Head head, Integer relativeRowIndex, Boolean isHead) {
    }

    @Override
    public void afterCellDispose(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, List<CellData> cellDataList, Cell cell, Head head, Integer relativeRowIndex, Boolean isHead) {
       // 只处理第一行
        if( 0 == cell.getRowIndex()){
            // 设置列宽
            Sheet sheet = writeSheetHolder.getSheet();
            sheet.setColumnWidth(cell.getColumnIndex(), 14 * 256);
            // 设置行高
            writeSheetHolder.getSheet().getRow(0).setHeight((short)(1.8*256));
            // 获取workbook
            Workbook workbook = writeSheetHolder.getSheet().getWorkbook();
            // 获取样式实例
            WriteCellStyle headWriteCellStyle = new WriteCellStyle();
            // 获取字体实例
            WriteFont headWriteFont = new WriteFont();
            // 设置字体样式
            headWriteFont.setFontName("宋体");
            // 设置字体大小
            headWriteFont.setFontHeightInPoints((short)14);
            // 边框
            headWriteFont.setBold(true);
            headWriteCellStyle.setWriteFont(headWriteFont);
            // 设置背景颜色为灰色           
headWriteCellStyle.setFillForegroundColor(IndexedColors.GREY_25_PERCENT.getIndex());
            if (CollectionUtils.isNotEmpty(columnIndexs) &&
                    CollectionUtils.isNotEmpty(rowIndexs) &&
                    colorIndex != null &&
                    cell.getRowIndex() == 0 &&
                    columnIndexs.contains(cell.getColumnIndex())) {
                // 设置指定单元格字体自定义颜色
                headWriteFont.setColor(colorIndex);
            }
            // 获取样式实例
            CellStyle cellStyle = StyleUtil.buildHeadCellStyle(workbook, headWriteCellStyle);
            // 单元格设置样式
            cell.setCellStyle(cellStyle);
        }
    }
}

3.2 表行样式处理类

import com.alibaba.excel.metadata.CellData;
import com.alibaba.excel.metadata.Head;
import com.alibaba.excel.util.StyleUtil;
import com.alibaba.excel.write.handler.CellWriteHandler;
import com.alibaba.excel.write.metadata.holder.WriteSheetHolder;
import com.alibaba.excel.write.metadata.holder.WriteTableHolder;
import com.alibaba.excel.write.metadata.style.WriteCellStyle;
import com.alibaba.excel.write.metadata.style.WriteFont;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.collections4.CollectionUtils;
import org.apache.poi.ss.usermodel.*;
import java.util.List;
@Slf4j
public class CellColorSheetWriteHandler implements CellWriteHandler {

    //操作行
    private List<Integer> columnIndexs;
    //操作列
    private List<Integer> rowIndexs;
    //颜色
    private Short colorIndex;

    //构造
    public CellColorSheetWriteHandler(List<Integer> rowIndexs, List<Integer> columnIndexs, Short colorIndex) {
        this.rowIndexs = rowIndexs;
        this.columnIndexs = columnIndexs;
        this.colorIndex = colorIndex;
    }

    public CellColorSheetWriteHandler() {
    }

    @Override
    public void beforeCellCreate(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, Row row, Head head, Integer columnIndex, Integer relativeRowIndex, Boolean isHead) {
    }

    @Override
    public void afterCellCreate(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, Cell cell, Head head, Integer relativeRowIndex, Boolean isHead) {
    }

    @Override
    public void afterCellDispose(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, List<CellData> cellDataList, Cell cell, Head head, Integer relativeRowIndex, Boolean isHead) {
       //不处理第一行  
       if(0 != cell.getRowIndex()){
            // 根据单元格获取workbook
            Workbook workbook = cell.getSheet().getWorkbook();
            //设置行高  
            writeSheetHolder.getSheet().getRow(cell.getRowIndex()).setHeight((short)(1.4*256));
            // 单元格策略
            WriteCellStyle contentWriteCellStyle = new WriteCellStyle();
            // 设置背景颜色白色
            contentWriteCellStyle.setFillForegroundColor(IndexedColors.WHITE.getIndex());
            // 设置垂直居中为居中对齐
            contentWriteCellStyle.setVerticalAlignment(VerticalAlignment.CENTER);
            // 设置左右对齐为靠左对齐
            contentWriteCellStyle.setHorizontalAlignment(HorizontalAlignment.LEFT);
            // 设置单元格上下左右边框为细边框
            contentWriteCellStyle.setBorderBottom(BorderStyle.THIN);
            contentWriteCellStyle.setBorderLeft(BorderStyle.THIN);
            contentWriteCellStyle.setBorderRight(BorderStyle.THIN);
            contentWriteCellStyle.setBorderTop(BorderStyle.THIN);
            // 创建字体实例
            WriteFont cellWriteFont = new WriteFont();
            // 设置字体大小
            cellWriteFont.setFontHeightInPoints((short)12);
            if (CollectionUtils.isNotEmpty(columnIndexs) &&
                    CollectionUtils.isNotEmpty(rowIndexs) &&
                    colorIndex != null &&
                    rowIndexs.contains(cell.getRowIndex()) &&
                    columnIndexs.contains(cell.getColumnIndex())) {
                // 设置指定单元格字体颜色
                cellWriteFont.setColor(colorIndex);
            }
            contentWriteCellStyle.setWriteFont(cellWriteFont);
            CellStyle cellStyle = StyleUtil.buildHeadCellStyle(workbook, contentWriteCellStyle);
            cell.setCellStyle(cellStyle);
        }
    }
}

3.3 编写工具类

/**
     * 导出表头必填字段标红色
     * @param outputStream 输入流
     * @param dataList 导入数据
     * @param headList 表头列表
     * @param sheetName sheetname
     * @param cellWriteHandlers
     */
    public static void writeExcelWithModel(OutputStream outputStream, List<? extends Object> dataList, List<String> headList, String sheetName, CellWriteHandler... cellWriteHandlers) {
        List<List<String>> list = new ArrayList<>();
        if(headList != null){
            headList.forEach(h -> list.add(Collections.singletonList(h)));
        }

        // 头的策略
        WriteCellStyle headWriteCellStyle = new WriteCellStyle();
        // 单元格策略
        WriteCellStyle contentWriteCellStyle = new WriteCellStyle();
        // 初始化表格样式
        HorizontalCellStyleStrategy horizontalCellStyleStrategy = new HorizontalCellStyleStrategy(headWriteCellStyle, contentWriteCellStyle);

        ExcelWriterSheetBuilder excelWriterSheetBuilder = EasyExcel.write(outputStream).head(list).sheet(sheetName).registerWriteHandler(horizontalCellStyleStrategy);
        if(null != cellWriteHandlers && cellWriteHandlers.length>0){
            for(int i = 0 ; i < cellWriteHandlers.length;i++){
                excelWriterSheetBuilder.registerWriteHandler(cellWriteHandlers[i]);
            }
        }
        // 开始导出
        excelWriterSheetBuilder.doWrite(dataList);
    }
/**
     * 导出表头必填字段标红色
     * @param outputStream 输入流
     * @param dataList 导入数据
     * @param headList 表头列表
     * @param sheetName sheetname
     * @param cellWriteHandlers
     */
    public static void writeExcelWithModel(OutputStream outputStream, List<? extends Object> dataList, Class<? extends Object> headList, String sheetName, CellWriteHandler... cellWriteHandlers) {

        // 头的策略
        WriteCellStyle headWriteCellStyle = new WriteCellStyle();
        // 单元格策略
        WriteCellStyle contentWriteCellStyle = new WriteCellStyle();
        // 初始化表格样式
        HorizontalCellStyleStrategy horizontalCellStyleStrategy = new HorizontalCellStyleStrategy(headWriteCellStyle, contentWriteCellStyle);

        ExcelWriterSheetBuilder excelWriterSheetBuilder = EasyExcel.write(outputStream,headList).sheet(sheetName).registerWriteHandler(horizontalCellStyleStrategy);
        if(null != cellWriteHandlers && cellWriteHandlers.length>0){
            for(int i = 0 ; i < cellWriteHandlers.length;i++){
                excelWriterSheetBuilder.registerWriteHandler(cellWriteHandlers[i]);
            }
        }
        // 开始导出
        excelWriterSheetBuilder.doWrite(dataList);
    }

使用示例

public static void main(String[] args) throws Exception {
        // 输出流
        OutputStream outputStream = null;
        outputStream = new FileOutputStream(new File("D:\\1.xlsx"));

        // 导出的数据
        List<TestVO> dataList = new ArrayList<>();
        for (int i = 0; i < 10; i++) {
            TestVO testVO = new TestVO();
            testVO.setAge(i + 20);
            testVO.setName("vo" + i);
            testVO.setSchool("school" + i);
            dataList.add(testVO);
        }

        // 标题
        List<String> headList = Arrays.asList("姓名", "年龄", "学校");

        String sheetName = "导出文件";

        List<Integer> columnIndexs = Arrays.asList(0,1,2);
        List<Integer> rowIndexs = Arrays.asList(0);
        TitleColorSheetWriteHandler titleColorSheetWriteHandler = new TitleColorSheetWriteHandler(rowIndexs, columnIndexs, IndexedColors.RED.index);

        List<Integer> columnIndexs1 = Arrays.asList(0,1);
        List<Integer> rowIndexs1 = Arrays.asList(1,2,3,4);
        CellColorSheetWriteHandler colorSheetWriteHandler = new CellColorSheetWriteHandler(rowIndexs1, columnIndexs1, IndexedColors.RED.index);

        writeExcelWithModel(outputStream, dataList, headList, sheetName, titleColorSheetWriteHandler,colorSheetWriteHandler);
    }
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