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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;}@Overridepublic CellStyle getHeaderStyle(short i) {return headerStyle;}@Overridepublic CellStyle getTitleStyle(short i) {return titleStyle;}@Overridepublic CellStyle getStyles(boolean b, ExcelExportEntity excelExportEntity) {return styles;}@Overridepublic CellStyle getStyles(Cell cell, int i, ExcelExportEntity excelExportEntity, Object o, Object o1) {return getStyles(true, excelExportEntity);}@Overridepublic 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