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package com.learning.demo.util.html;import org.apache.commons.lang3.StringUtils;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.util.CellRangeAddress;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;import java.io.File;
import java.io.FileInputStream;
import java.text.DecimalFormat;
import java.util.HashMap;
import java.util.Map;/*** Excel解析处理*/
public class HtmlExcelUtil {private Logger log = LoggerFactory.getLogger(this.getClass());private static final String UNION = "table_union_used";private Workbook workbook;public HtmlExcelUtil(File file) throws Exception {workbook = WorkbookFactory.create(new FileInputStream(file));}public void buildHtmlExcel() {TableColumnGroup tableColumnMap = getTableColumnMap();soutHtmlTable(tableColumnMap);}private void soutHtmlTable(TableColumnGroup tableColumnMap) {Map<String, TableColumn> map = tableColumnMap.getMap();Integer maxCell = tableColumnMap.getMaxCell();Integer maxRow = tableColumnMap.getMaxRow();StringBuilder sb = new StringBuilder();sb.append("<table>");for (int y = 0; y <= maxRow; y++) {sb.append("<tr>");for (int x = 0; x <= maxCell; x++) {TableColumn tableColumn = map.get(x + "-" + y);if (tableColumn == null) {continue;}String value = tableColumn.getValue();if (!UNION.equals(value)) {sb.append("<td ");if (tableColumn.getHigh() > 1) {sb.append("rowspan=\"");sb.append(tableColumn.getHigh());sb.append("\" ");}if (tableColumn.getWide() > 1) {sb.append("colspan=\"");sb.append(tableColumn.getWide());sb.append("\" ");}sb.append(">");sb.append(value);sb.append("</td>");}}sb.append("</tr>");}sb.append("</table>");System.out.println(sb.toString());}/*** 读取处理excel数据** @throws Exception*/public TableColumnGroup getTableColumnMap() {try {Sheet sheet = workbook.getSheetAt(0);Map<String, TableColumn> map = new HashMap<>();// 处理合并单元格buildUnionTable(sheet, map);int lastRowNum = sheet.getLastRowNum();short lastCellNum = sheet.getRow(0).getLastCellNum();for (int rowIndex = 0; rowIndex <= lastRowNum; rowIndex++) {Row row = sheet.getRow(rowIndex);for (short cellIndex = 0; cellIndex < lastCellNum; cellIndex++) {Cell cell = row.getCell(cellIndex);String cellValue = (String) getCellValue(cell);String key = cellIndex + "-" + rowIndex;if (map.get(key) == null) {map.put(key, new TableColumn(cellValue));}}}return new TableColumnGroup(map, (int) lastCellNum, lastRowNum);} catch (Exception e) {log.error("解析Excel异常", e);} finally {try {workbook.close();} catch (Exception e) {log.error("workbook关闭异常", e);}}return null;}/*** 处理合并单元格** @param sheet* @param map*/private void buildUnionTable(Sheet sheet, Map<String, TableColumn> map) {// 遍历合并区域for (int i = 0; i < sheet.getNumMergedRegions(); i++) {CellRangeAddress region = sheet.getMergedRegion(i);//int firstColumn = region.getFirstColumn(); // 合并区域首列位置int lastColumn = region.getLastColumn();int firstRow = region.getFirstRow(); // 合并区域首行位置int lastRow = region.getLastRow();Row firRow = sheet.getRow(firstRow);Cell firCell = firRow.getCell(firstColumn);String cellValue = (String) getCellValue(firCell);TableColumn tableColumn = new TableColumn(lastColumn - firstColumn + 1, lastRow - firstRow + 1, cellValue);map.put(firstColumn + "-" + firstRow, tableColumn);// 处理合并单元格boolean flag = true;for (int y = firstRow; y <= lastRow; y++) {for (int x = firstColumn; x <= lastColumn; x++) {if (flag) {flag = false;continue;}TableColumn value = new TableColumn(UNION);map.put(x + "-" + y, value);}}}}/*** 获取cell内容** @param cell* @return*/private String getCellValue(Cell cell) {String value = null;if (cell != null) {switch (cell.getCellTypeEnum()) {case STRING:if (cell.getStringCellValue().trim().equals("'")) {value = "";} else if (cell.getStringCellValue().trim().equals("")) {value = null;} else {value = cell.getStringCellValue();}break;case NUMERIC:if (DateUtil.isCellDateFormatted(cell)) {value = cell.getDateCellValue().toString();} else {value = new DecimalFormat("#.######").format(cell.getNumericCellValue());}break;case BLANK:value = null;break;default:value = null;}}if (StringUtils.isNotEmpty(value)) {// 替换多余2个的空格为单个空格,替换空行为单个空格value = value.replaceAll("\\s{2,}", " ").replaceAll("(?m)^\\s*$" + System.lineSeparator(), " ");}return value;}class TableColumnGroup {private Map<String, TableColumn> map;private Integer maxCell;private Integer maxRow;TableColumnGroup(Map<String, TableColumn> map, Integer maxCell, Integer maxRow) {this.map = map;this.maxCell = maxCell;this.maxRow = maxRow;}Map<String, TableColumn> getMap() {return map;}Integer getMaxCell() {return maxCell;}Integer getMaxRow() {return maxRow;}}class TableColumn {private Integer wide;private Integer high;private String value;TableColumn(String value) {this.high = 1;this.wide = 1;this.value = value;}TableColumn(Integer wide, Integer high, String value) {this.wide = wide;this.high = high;this.value = value;}Integer getHigh() {return high;}Integer getWide() {return wide;}String getValue() {return value;}}}
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