POI生成Excel工具类
该工具类中，包含：创建表格（带默认样式）、自定义样式（通过重写 setDefaultStyle和setFirstCellStyle）、合并单元格、宽度自适应等。
/**
* Excel操作工具类
*/
public class ExcelTools {
/**
* 默认的样式， 垂直水平居中、默认换行
*/
private XSSFCellStyle defaultStyle;
/**
* 默认的行首样式
*/
private XSSFCellStyle firstCellStyle;
private static SimpleDateFormat sdf = new SimpleDateFormat("yyyy.MM.dd hh:mm");
public XSSFWorkbook createWorkbook() {
XSSFWorkbook workbook = new XSSFWorkbook();
XSSFFont defaultFont = workbook.createFont();
defaultFont.setColor(IndexedColors.BLACK.getIndex());
defaultFont.setFontHeight(11);
defaultFont.setFontName("微软雅黑 Light");
XSSFCellStyle defaultStyle = workbook.createCellStyle();
defaultStyle.setWrapText(true);
defaultStyle.setAlignment(HorizontalAlignment.CENTER);
defaultStyle.setVerticalAlignment(VerticalAlignment.CENTER);
defaultStyle.setFont(defaultFont);
XSSFFont font = workbook.createFont();
font.setColor(IndexedColors.WHITE.getIndex());
font.setFontHeight(11);
font.setFontName("微软雅黑 Light");
XSSFCellStyle firstCellStyle = workbook.createCellStyle();
firstCellStyle.setAlignment(HorizontalAlignment.CENTER);
firstCellStyle.setVerticalAlignment(VerticalAlignment.CENTER);
firstCellStyle.setFillForegroundColor(IndexedColors.LIGHT_BLUE.getIndex());
firstCellStyle.setFillPattern(FillPatternType.SOLID_FOREGROUND);
firstCellStyle.setFont(font);
firstCellStyle.setBorderBottom(BorderStyle.THIN);
firstCellStyle.setBottomBorderColor(IndexedColors.LIGHT_BLUE.getIndex());
firstCellStyle.setLeftBorderColor(IndexedColors.LIGHT_BLUE.getIndex());
firstCellStyle.setRightBorderColor(IndexedColors.LIGHT_BLUE.getIndex());
setDefaultStyle(defaultStyle);
setFirstCellStyle(firstCellStyle);
return workbook;
}
// 创建页
public XSSFSheet createSheet(XSSFWorkbook workbook, String sheetName) {
return workbook.createSheet(sheetName);
}
/**
* 创建表格
*
* @param sheet 页 @NotNull
* @param titles 首行标题 @NotNull
* @param content 填充的内容 @NotNull
* @param rowNumber 开始的行号 @NotNull
* @param colNumber 开始的列号 @NotNull
* @param customRowHeight 自定义行高
* @param cellRangeList 需要合并的单元格
* @param customRowStyle 自定义样式,key 对应行，value 对应样式
* @param customColWidth 自定义宽度自适应
*/
@SuppressWarnings("unchecked")
public void createTable(XSSFSheet sheet, String[] titles, Object[][] content,
Integer rowNumber, Integer colNumber,
boolean customRowHeight,
List cellRangeList,
Map customRowStyle,
Map customColWidth) {
// 首行填充
setFirstRow(sheet, titles, getFirstCellStyle(), rowNumber, colNumber);
rowNumber++;
// 设置单元格宽度
autoWidth(sheet, titles, colNumber, customColWidth);
// 填充数据
for (int i = 0; i < content.length; i++) {
Object[] rowContent = content[i];
XSSFRow row = sheet.getRow(rowNumber + i) == null ? sheet.createRow(rowNumber + i) : sheet.getRow(rowNumber + i);
row.setHeight(customRowHeight ? (short) 800 : -1);
XSSFCellStyle cellStyle = customRowStyle == null || customRowStyle.get(rowNumber + i) == null ?
getDefaultStyle() : customRowStyle.get(rowNumber + i);
for (int j = 0; j < rowContent.length; j++) {
Object colContent = rowContent[j];
XSSFCell cell = row.createCell(colNumber + j);
// 如果是基本数据类型，则转换为字符串填充; 日期转换输出; List转String输出
if (colContent instanceof Integer || colContent instanceof Double
|| colContent instanceof String || colContent instanceof Float
|| colContent instanceof Character || colContent instanceof Byte
|| colContent instanceof Short || colContent instanceof Boolean
|| colContent instanceof Long)
cell.setCellValue(String.valueOf(colContent));
else if (colContent instanceof Date)
cell.setCellValue(sdf.format(colContent));
else if (colContent instanceof Iterable)
cell.setCellValue(new XSSFRichTextString(String.join(" \n ", (Iterable) colContent)));
else
cell.setCellValue(" - ");
// 单元格样式
cell.setCellStyle(cellStyle);
}
}
// 合并单元格
mergeRegion(sheet, cellRangeList);
}
/**
* 合并单元格
*/
public static void mergeRegion(XSSFSheet sheet, List cellRangeList) {
if (cellRangeList == null) return;
for (CellRange cellRange : cellRangeList) {
sheet.addMergedRegion(new CellRangeAddress(cellRange.getFirstRow(), cellRange.getLastRow(), cellRange.getFirstCol(), cellRange.getLastCol()));
}
}
/**
* 无需定制样式和宽度的表格
*/
public void createTable(XSSFSheet sheet, String[] titles, Object[][] content,
Integer rowNumber, Integer colNumber) {
createTable(sheet, titles, content, rowNumber, colNumber, true, null, null, null);
}
/**
* 填充首行数据
* 默认按照标题的长度设置单元格宽度
*
* @param sheet 页
* @param cellTitles 标题
* @param headerStyle 首行样式
* @param rowNum 起始行
* @param colNum 起始列
*/
public static void setFirstRow(XSSFSheet sheet, String[] cellTitles, XSSFCellStyle headerStyle, int rowNum, int colNum) {
final XSSFRow row = sheet.getRow(rowNum) == null ? sheet.createRow(rowNum) : sheet.getRow(rowNum);
row.setHeight((short) 800);
for (String cellName : cellTitles) {
final Cell cell = row.createCell(colNum++);
cell.setCellValue(cellName);
cell.setCellStyle(headerStyle);
}
}
/**
* 宽度自适应
*
* @param sheet 页
* @param strings 行首
* @param colNumber 起始列
* @param customWidth 自定义宽度
*/
public static void autoWidth(Sheet sheet, String[] strings, Integer colNumber, Map customWidth) {
for (int s = 0; s < strings.length; s++) {
int col = colNumber + s;
if (customWidth != null && customWidth.keySet().contains(col)) {
sheet.setColumnWidth(col, customWidth.get(col));
} else {
sheet.autoSizeColumn(col, true);
sheet.setColumnWidth(col, sheet.getColumnWidth(col) * 17 / 10);
}
}
}
public XSSFCellStyle getDefaultStyle() {
return defaultStyle;
}
public void setDefaultStyle(XSSFCellStyle defaultStyle) {
this.defaultStyle = defaultStyle;
}
public XSSFCellStyle getFirstCellStyle() {
return firstCellStyle;
}
public void setFirstCellStyle(XSSFCellStyle firstCellStyle) {
this.firstCellStyle = firstCellStyle;
}
}
合并单元格的对象：
/**
* 需要合并的单元格
*/
@Setter
@Getter
public class CellRange {
private Integer firstRow;
private Integer lastRow;
private Integer firstCol;
private Integer lastCol;
private CellRange(Integer firstRow, Integer lastRow, Integer firstCol, Integer lastCol) {
this.firstRow = firstRow;
this.lastRow = lastRow;
this.firstCol = firstCol;
this.lastCol = lastCol;
}
public static CellRange build(Integer firstRow, Integer lastRow, Integer firstCol, Integer lastCol) {
return new CellRange(firstRow, lastRow, firstCol, lastCol);
}
}