easypoi 导出excel设置标题样式

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基于easypoi的上一篇文章 easypoi-实现动态列导出excel

这次说说easypoi怎么设置标题的样式

直接上代码：

先看看源码ExportParams类中的默认style

public ExportParams() {
        this.color = HSSFColorPredefined.WHITE.getIndex();
        this.headerColor = HSSFColorPredefined.SKY_BLUE.getIndex();
        this.type = ExcelType.XSSF;
        this.style = ExcelExportStylerDefaultImpl.class;
        this.headerHeight = 9.0D;
        this.isCreateHeadRows = true;
        this.isDynamicData = false;
        this.isAppendGraph = true;
        this.isFixedTitle = true;
        this.maxNum = 0;
        this.height = 0;
        this.readonly = false;
        this.autoSize = false;
    }

跟踪代码：

this.style = ExcelExportStylerDefaultImpl.class;

public class ExcelExportStylerDefaultImpl extends AbstractExcelExportStyler implements IExcelExportStyler {
    public ExcelExportStylerDefaultImpl(Workbook workbook) {
        super.createStyles(workbook);
    }

    public CellStyle getTitleStyle(short color) {
        CellStyle titleStyle = this.workbook.createCellStyle();
        titleStyle.setAlignment(HorizontalAlignment.CENTER);
        titleStyle.setVerticalAlignment(VerticalAlignment.CENTER);
        titleStyle.setWrapText(true);
        return titleStyle;
    }

    public CellStyle stringSeptailStyle(Workbook workbook, boolean isWarp) {
        CellStyle style = workbook.createCellStyle();
        style.setAlignment(HorizontalAlignment.CENTER);
        style.setVerticalAlignment(VerticalAlignment.CENTER);
        style.setDataFormat(STRING_FORMAT);
        if (isWarp) {
            style.setWrapText(true);
        }

        return style;
    }

    public CellStyle getHeaderStyle(short color) {
        CellStyle titleStyle = this.workbook.createCellStyle();
        Font font = this.workbook.createFont();
        font.setFontHeightInPoints((short)12);
        titleStyle.setFont(font);
        titleStyle.setAlignment(HorizontalAlignment.CENTER);
        titleStyle.setVerticalAlignment(VerticalAlignment.CENTER);
        return titleStyle;
    }

    public CellStyle stringNoneStyle(Workbook workbook, boolean isWarp) {
        CellStyle style = workbook.createCellStyle();
        style.setAlignment(HorizontalAlignment.CENTER);
        style.setVerticalAlignment(VerticalAlignment.CENTER);
        style.setDataFormat(STRING_FORMAT);
        if (isWarp) {
            style.setWrapText(true);
        }

        return style;
    }
}

基于默认实现，我们可以重新定义IExcelExportStyler的实现：

ExcelExportStyle类

public class ExcelExportStyle implements IExcelExportStyler {

    private static final short STRING_FORMAT = (short) BuiltinFormats.getBuiltinFormat("TEXT");
    private static final short FONT_SIZE_ELEVEN = 11;
    private static final short FONT_SIZE_TWELVE = 12;
    /**
     * 标题样式
     */
    private CellStyle headerStyle;
    /**
     * 每列标题样式
     */
    private CellStyle titleStyle;
    /**
     * 数据行样式
     */
    private CellStyle styles;


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

    private void init(Workbook workbook) {
        this.headerStyle = initHeaderStyle(workbook);
        this.titleStyle = initTitleStyle(workbook);
        this.styles = initStyles(workbook);
    }

    private CellStyle initHeaderStyle(Workbook workbook) {
        CellStyle style = getBaseCellStyle(workbook);
        style.setFont(getFont(workbook, (short) 16, true));
        return style;
    }

    private CellStyle initTitleStyle(Workbook workbook) {
        CellStyle style = getBaseCellStyle(workbook);
        style.setFont(getFont(workbook, FONT_SIZE_TWELVE, true));
        style.setDataFormat(STRING_FORMAT);
        return style;
    }
    private CellStyle initStyles(Workbook workbook) {
        CellStyle style = getBaseCellStyle(workbook);
        style.setFont(getFont(workbook, FONT_SIZE_ELEVEN, false));
        style.setDataFormat(STRING_FORMAT);
        return style;
    }

    private CellStyle getBaseCellStyle(Workbook workbook) {
        CellStyle style = workbook.createCellStyle();
        //水平居中
        style.setAlignment(HorizontalAlignment.CENTER);
        //上下居中
        style.setVerticalAlignment(VerticalAlignment.CENTER);
        //设置自动换行
        style.setWrapText(true);
        return style;
    }

    private Font getFont(Workbook workbook, short size, boolean isBold) {
        Font font = workbook.createFont();
        //字体样式
        font.setFontName("宋体");
        //是否加粗
        font.setBold(isBold);
        //字体大小
        font.setFontHeightInPoints(size);
        return font;
    }


    @Override
    public CellStyle getHeaderStyle(short i) {
        return headerStyle;
    }

    @Override
    public CellStyle getTitleStyle(short i) {
        return titleStyle;
    }

    @Override
    public CellStyle getStyles(boolean b, ExcelExportEntity excelExportEntity) {
        return styles;
    }

    @Override
    public CellStyle getStyles(Cell cell, int i, ExcelExportEntity excelExportEntity, Object o, Object o1) {
        return getStyles(true, excelExportEntity);
    }

    @Override
    public CellStyle getTemplateStyles(boolean b, ExcelForEachParams excelForEachParams) {
        return null;
    }
}

导出方法设置样式：

ExportParams exportParams = new ExportParams();
exportParams.setStyle(ExcelExportStyle.class);
Workbook workbook = ExcelExportUtil.exportExcel(exportParams, DataInfo.class, dataList);

效果

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