Easypoi one to many, merge cells, and adapt the row height according to the content

Make a note of

effect

One 、 Introduce dependencies

<dependency>
	<groupId>cn.afterturn</groupId>
	<artifactId>easypoi-spring-boot-starter</artifactId>
	<version>4.1.3</version>
</dependency>

Two 、 Entity class

import cn.afterturn.easypoi.excel.annotation.Excel;
import cn.afterturn.easypoi.excel.annotation.ExcelCollection;
import lombok.Data;
import java.util.List;

@Data
public class TestExportMainVo {
    
    @Excel(name = " project ",width = 20,needMerge = true)
    private String project;

    @ExcelCollection(name = "")
    private List<TestExportSub1Vo> sub1VoList;

    public TestExportMainVo(String project, List<TestExportSub1Vo> sub1VoList) {
    
        this.project = project;
        this.sub1VoList = sub1VoList;
    }
}

@Data
public class TestExportSub1Vo {
    
    @Excel(name = " Serial number ",width = 8,needMerge = true)
    private String sort;

    @Excel(name = " basis ",width = 30,needMerge = true)
    private String basis;

    @ExcelCollection(name = "")
    private List<TestExportSub2Vo> sub2VoList;

    public TestExportSub1Vo(String sort, String basis, List<TestExportSub2Vo> sub2VoList) {
    
        this.sort = sort;
        this.basis = basis;
        this.sub2VoList = sub2VoList;
    }
}

@Data
public class TestExportSub2Vo {
    
    @Excel(name = " Operation steps ",width = 60)
    private String step;

    @Excel(name = " Clause ",width = 12)
    private String clause;

    public TestExportSub2Vo(String step, String clause) {
    
        this.step = step;
        this.clause = clause;
    }
}

@Excel In the annotations ,needMerge =true Used to merge cells

3、 ... and 、excel Tool class

1、 Style tool class ExcelExportStylerUitl

import cn.afterturn.easypoi.excel.entity.params.ExcelExportEntity;
import cn.afterturn.easypoi.excel.entity.params.ExcelForEachParams;
import cn.afterturn.easypoi.excel.export.styler.IExcelExportStyler;
import org.apache.poi.ss.usermodel.*;

/** * @author fuHua * @date 2021 year 05 month 27 Japan  14:55 */
public class ExcelExportStylerUitl implements IExcelExportStyler {
    

    private static final short STRING_FORMAT = (short) BuiltinFormats.getBuiltinFormat("TEXT");
    private static final short FONT_SIZE_TEN = 10;
    private static final short FONT_SIZE_ELEVEN = 11;
    private static final short FONT_SIZE_TWELVE = 12;
    /** *  Headline style  */
    private CellStyle headerStyle;
    /** *  Each column header style  */
    private CellStyle titleStyle;
    /** *  Data line style  */
    private CellStyle styles;

    public ExcelExportStylerUitl(Workbook workbook) {
    
        this.init(workbook);
    }

    /** *  Initialize style  * @param workbook */
    private void init(Workbook workbook) {
    
        this.headerStyle = initHeaderStyle(workbook);
        this.titleStyle = initTitleStyle(workbook);
        this.styles = initStyles(workbook);
    }

    /** *  Headline style  * @param color * @return */
    @Override
    public CellStyle getHeaderStyle(short color) {
    
        return headerStyle;
    }

    /** *  Each column header style  * @param color * @return */
    @Override
    public CellStyle getTitleStyle(short color) {
    
        return titleStyle;
    }

    /** *  Data line style  * @param parity  Can be used to represent even and odd rows  * @param entity  The data content  * @return  style  */
    @Override
    public CellStyle getStyles(boolean parity, ExcelExportEntity entity) {
    
        return styles;
    }

    /** *  Get style method  * @param dataRow  data row  * @param obj  object  * @param data  data  */
    @Override
    public CellStyle getStyles(Cell cell, int dataRow, ExcelExportEntity entity, Object obj, Object data) {
    
        return getStyles(true, entity);
    }

    /** *  The style settings used by the template  */
    @Override
    public CellStyle getTemplateStyles(boolean isSingle, ExcelForEachParams excelForEachParams) {
    
        return null;
    }

    /** *  initialization -- Headline style  * @param workbook * @return */
    private CellStyle initHeaderStyle(Workbook workbook) {
    
        CellStyle style = getBaseCellStyle(workbook);
        style.setFont(getFont(workbook, (short) 14, true));
        return style;
    }

    /** *  initialization -- Each column header style  * @param workbook * @return */
    private CellStyle initTitleStyle(Workbook workbook) {
    
        CellStyle style = getBaseCellStyle(workbook);
        style.setFont(getFont(workbook, FONT_SIZE_TWELVE, true));
        // Background color 
// style.setFillForegroundColor(IndexedColors.GREY_25_PERCENT.getIndex());
        style.setFillPattern(FillPatternType.SOLID_FOREGROUND);
        return style;
    }

    /** *  initialization -- Data line style  * @param workbook * @return */
    private CellStyle initStyles(Workbook workbook) {
    
        CellStyle style = getBaseCellStyle(workbook);
        style.setFont(getFont(workbook, FONT_SIZE_ELEVEN, false));
        style.setDataFormat(STRING_FORMAT);
        return style;
    }

    /** *  Basic style  * @return */
    private CellStyle getBaseCellStyle(Workbook workbook) {
    
        CellStyle style = workbook.createCellStyle();
        // Under the frame 
        style.setBorderBottom(BorderStyle.THIN);
        // The left margin 
        style.setBorderLeft(BorderStyle.THIN);
        // On the border 
        style.setBorderTop(BorderStyle.THIN);
        // Right margin 
        style.setBorderRight(BorderStyle.THIN);
        // Horizontal center 
        style.setAlignment(HorizontalAlignment.CENTER);
        // Center up and down 
        style.setVerticalAlignment(VerticalAlignment.CENTER);
        // Set auto wrap 
        style.setWrapText(true);
        return style;
    }

    /** *  Font style  * @param size  font size  * @param isBold  Is it bold  * @return */
    private Font getFont(Workbook workbook, short size, boolean isBold) {
    
        Font font = workbook.createFont();
        // Font style 
        font.setFontName(" Song style ");
        // Is it bold 
        font.setBold(isBold);
        // font size 
        font.setFontHeightInPoints(size);
        return font;
    }
}

2、 Export tool class ExcelUtil

import cn.afterturn.easypoi.excel.ExcelExportUtil;
import cn.afterturn.easypoi.excel.entity.ExportParams;
import cn.afterturn.easypoi.excel.entity.enmus.ExcelType;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;

import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.net.URLEncoder;
import java.util.List;

/** * @author fuHua * @date 2021 year 06 month 04 Japan  14:09 */
public class ExcelUtil {
    
    public static void exportExcel(List<?> list, String title, String sheetName, Class<?> pojoClass, String fileName, ExcelType type, boolean isOneToMany, HttpServletResponse response){
    
        ExportParams exportParams = new ExportParams(title, sheetName,type);
        exportParams.setStyle(ExcelExportStylerUitl.class);
        Workbook workbook = ExcelExportUtil.exportExcel(exportParams,pojoClass,list);
        if (workbook != null);
        // Judge whether it is one to many 
        if (isOneToMany){
    
            setRowHeight(workbook);
        }
        downLoadExcel(fileName, response, workbook);
    }

    public static void exportExcel(List<?> list, String title, String sheetName, Class<?> pojoClass, String fileName,  boolean setRowHeight, HttpServletResponse response){
    
        ExportParams exportParams = new ExportParams(title, sheetName);
        exportParams.setStyle(ExcelExportStylerUitl.class);
        Workbook workbook = ExcelExportUtil.exportExcel(exportParams,pojoClass,list);
        if (workbook != null);
        // Judge whether the line height is adaptive according to the content 
        if (setRowHeight){
    
            Sheet sheet = workbook.getSheetAt(0);
            for(int i = 0; i <= sheet.getLastRowNum(); i ++) {
    
                Row row = sheet.getRow(i);
                setRowHeight(row);
            }
        }
        downLoadExcel(fileName, response, workbook);
    }

    private static void downLoadExcel(String fileName, HttpServletResponse response, Workbook workbook) {
    
        try {
    
            response.setCharacterEncoding("UTF-8");
            response.setHeader("content-Type", "application/vnd.ms-excel");
            response.setHeader("Content-Disposition",
                    "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8"));
            workbook.write(response.getOutputStream());
        } catch (IOException e) {
    
            throw new RuntimeException(e.getMessage());
        }
    }

    /** *  One to many , Set row height  */
    private static void setRowHeight(Workbook workbook){
    
        Sheet sheet = workbook.getSheetAt(0);
        // Set the first 4 The column width of the column is 60（ Subscript from 0 Start ）,TestExportSub2Vo  I don't know why the column width is set but it doesn't work , It can only be set separately here 
        sheet.setColumnWidth(3,60*256);
        for(int i = 0; i <= sheet.getLastRowNum(); i ++) {
    
            Row row = sheet.getRow(i);
            if (i==0){
    
                // Set the height of the first row （ Table title ）
                row.setHeightInPoints(35);
            }else if (i == 1){
    
                // Set the height of the second row （ Table header ）
                row.setHeightInPoints(25);
            }else {
    
            	// Set the row height of other rows to be adaptive according to the content 
                setRowHeight(row);
            }
        }
    }

    private static void setRowHeight(Row row){
    
        // Set the line height according to the content length 
        int enterCnt = 0;
        for(int j = 0; j < row.getPhysicalNumberOfCells(); j ++) {
    
            int rwsTemp = row.getCell(j).toString().length();
            // Here, take the characters of the column with the largest character length in each row 
            if (rwsTemp > enterCnt) {
    
                enterCnt = rwsTemp;
            }
        }
        // Set the default row height to 35
        row.setHeightInPoints(35);
        // If the character length is greater than 35, How many times larger is the judgment , Set the corresponding row height according to the multiple 
        if (enterCnt>35){
    
            float d = enterCnt/35;
            float f = 35*d;
            /*if (d>2 && d<4){ f = 35*2; }else if(d>=4 && d<6){ f = 35*3; }else if (d>=6 && d<8){ f = 35*4; }*/
            row.setHeightInPoints(f);
        }
    }
}

as for easyexcel To merge cells , It has no image. easypoi equally , There is a property that controls the merge ,easyexcel You need to write your own code to control . Then, if the line height is adaptive according to the content ,easyexcel It should be similar to this , Haven't studied , Go and have a look next time