话不多说，请看代码：

ExcelUtil.java

package pers.kangxu.datautils.utils;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.util.ArrayList;import java.util.HashMap;import java.util.Iterator;import java.util.List;import java.util.Map;import org.apache.poi.hssf.usermodel.HSSFCellStyle;import org.apache.poi.hssf.usermodel.HSSFFont;import org.apache.poi.hssf.usermodel.HSSFWorkbook;import org.apache.poi.ss.usermodel.Cell;import org.apache.poi.ss.usermodel.CellStyle;import org.apache.poi.ss.usermodel.CellValue;import org.apache.poi.ss.usermodel.Font;import org.apache.poi.ss.usermodel.FormulaEvaluator;import org.apache.poi.ss.usermodel.Row;import org.apache.poi.ss.usermodel.Sheet;import org.apache.poi.ss.usermodel.Workbook;import org.apache.poi.ss.util.CellRangeAddress;/** * * <b> * excel 工具 * </b> * @author kangxu * */public class ExcelUtil { /** * 导出 excel * @param filePath 文件全路径 * @param sheetName sheet页名称 * @param sheetIndex 当前sheet下表 从0开始 * @param fileHeader 头部 * @param datas 内容 */ public static void writeExcel(String filePath,String sheetName, int sheetIndex, String[] fileHeader, List<String[]> datas){ // 创建工作簿 Workbook wb = new HSSFWorkbook(); // 创建工作表 sheet Sheet s = wb.createSheet(); wb.setSheetName(sheetIndex, sheetName); Row r = s.createRow(0); Cell c = null; Font font = null; CellStyle styleHeader = null; CellStyle styleContent = null; //粗体 font = wb.createFont(); font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD); // 设置头样式 styleHeader = wb.createCellStyle(); styleHeader.setFont(font); styleHeader.setBorderBottom(HSSFCellStyle.BORDER_THIN); //下边框 styleHeader.setBorderLeft(HSSFCellStyle.BORDER_THIN);//左边框 styleHeader.setBorderTop(HSSFCellStyle.BORDER_THIN);//上边框 styleHeader.setBorderRight(HSSFCellStyle.BORDER_THIN);//右边框 // 设置内容样式 styleContent = wb.createCellStyle(); styleContent.setBorderBottom(HSSFCellStyle.BORDER_THIN); //下边框 styleContent.setBorderLeft(HSSFCellStyle.BORDER_THIN);//左边框 styleContent.setBorderTop(HSSFCellStyle.BORDER_THIN);//上边框 styleContent.setBorderRight(HSSFCellStyle.BORDER_THIN);//右边框 //设置头 for(int i=0;i<fileHeader.length;){ c = r.createCell(i); c.setCellStyle(styleHeader); c.setCellValue(fileHeader[i]); i++; } //设置内容 for(int rownum=0;rownum<datas.size();){ // 行 row datas.size() r = s.createRow(rownum+1); //创建行 for(int cellnum=0;cellnum<fileHeader.length;){ c = r.createCell(cellnum); c.setCellValue(datas.get(rownum)[cellnum]); c.setCellStyle(styleContent); cellnum++; } rownum++; } FileOutputStream out = null; try { // 创建文件或者文件夹,将内容写进去 if(FileUtil.createFile(new File(filePath))){ out = new FileOutputStream(filePath); wb.write(out); } } catch (Exception e) { e.printStackTrace(); }finally { try { // 关闭流 if(out != null){ out.flush(); out.close(); } } catch (IOException e) { e.printStackTrace(); } } } /** * 读取 excel 文件内容 * @param filePath * @param sheetIndex */ public static List<Map<String,String>> readExcel(String filePath,int sheetIndex){ List<Map<String,String>> mapList = new ArrayList<Map<String,String>>(); // 头 List<String> list = new ArrayList<String>(); // int cnt = 0; int idx = 0; try { InputStream input = new FileInputStream(filePath); //建立输入流 Workbook wb = null; wb = new HSSFWorkbook(input); // 获取sheet页 Sheet sheet = wb.getSheetAt(sheetIndex); Iterator<Row> rows = sheet.rowIterator(); while (rows.hasNext()) { Row row = rows.next(); Iterator<Cell> cells = row.cellIterator(); Map<String,String> map = new HashMap<String,String>(); if(cnt == 0){ // 将头放进list中 while (cells.hasNext()) { Cell cell = cells.next(); if(isContainMergeCell(sheet)){ cancelMergeCell(sheet); } list.add(getStringCellValue(cell)); } cnt ++; continue; }else { while (cells.hasNext()) { Cell cell = cells.next(); if(isContainMergeCell(sheet)){ cancelMergeCell(sheet); } // 区别相同的头 list = ListUtil.changeSameVal(list); map.put(list.get(idx++), getStringCellValue(cell)); } } idx = 0; mapList.add(map); } return mapList; } catch (IOException ex) { ex.printStackTrace(); } return null; } /** * 合并单元格 * @param sheet 当前sheet页 * @param firstRow 开始行 * @param lastRow 结束行 * @param firstCol 开始列 * @param lastCol 结束列 */ public static int mergeCell(Sheet sheet,int firstRow,int lastRow,int firstCol,int lastCol){ if(sheet == null){ return -1; } return sheet.addMergedRegion(new CellRangeAddress(firstRow, lastRow, firstCol, lastCol)); } /** * 取消合并单元格 * @param sheet * @param idx */ public static void cancelMergeCell(Sheet sheet){ int sheetMergeCount = sheet.getNumMergedRegions(); for(int idx = 0; idx < sheetMergeCount;){ CellRangeAddress range = sheet.getMergedRegion(idx); String val = getMergeCellValue(sheet,range.getFirstRow(),range.getLastRow()); // 取消合并单元格 sheet.removeMergedRegion(idx); for(int rownum=range.getFirstRow();rownum<range.getLastRow()+1;){ for(int cellnum=range.getFirstColumn();cellnum<range.getLastColumn()+1;){ sheet.getRow(rownum).getCell(cellnum).setCellValue(val); cellnum ++; } rownum ++; } idx++; } } /** * 判断指定单元格是否是合并单元格 * @param sheet 当前sheet页 * @param firstRow 开始行 * @param lastRow 结束行 * @param firstCol 开始列 * @param lastCol 结束列 * @return */ public static boolean isMergeCell(Sheet sheet, int row ,int column){ int sheetMergeCount = sheet.getNumMergedRegions(); for(int i = 0; i < sheetMergeCount;){ CellRangeAddress range = sheet.getMergedRegion(i); int firstColumn = range.getFirstColumn(); int lastColumn = range.getLastColumn(); int firstRow = range.getFirstRow(); int lastRow = range.getLastRow(); if(row >= firstRow && row <= lastRow){ if(column >= firstColumn && column <= lastColumn){ return true; } } i++; } return false; } /** * 判断sheet页中是否含有合并单元格 * @param sheet * @return */ public static boolean isContainMergeCell(Sheet sheet){ if(sheet == null){ return false; } return sheet.getNumMergedRegions()>0 ? true : false; } /** * 获取指定合并单元的值 * @param sheet * @param row * @param column * @return */ public static String getMergeCellValue(Sheet sheet, int row ,int column){ int sheetMergeCount = sheet.getNumMergedRegions(); for(int i = 0; i < sheetMergeCount;){ CellRangeAddress range = sheet.getMergedRegion(i); int firstColumn = range.getFirstColumn(); int lastColumn = range.getLastColumn(); int firstRow = range.getFirstRow(); int lastRow = range.getLastRow(); if(row >= firstRow && row <= lastRow){ if(column >= firstColumn && column <= lastColumn){ Row fRow = sheet.getRow(firstRow); Cell fCell = fRow.getCell(firstColumn); return getStringCellValue(fCell) ; } } i++; } return null; } /** * 获取单元格的值 * @param cell * @return */ public static String getStringCellValue(Cell cell) { String strCell = ""; if(cell==null) return strCell; switch (cell.getCellType()) { case Cell.CELL_TYPE_STRING: strCell = cell.getRichStringCellValue().getString().trim(); break; case Cell.CELL_TYPE_NUMERIC: strCell = String.valueOf(cell.getNumericCellValue()); break; case Cell.CELL_TYPE_BOOLEAN: strCell = String.valueOf(cell.getBooleanCellValue()); break; case Cell.CELL_TYPE_FORMULA: FormulaEvaluator evaluator = cell.getSheet().getWorkbook().getCreationHelper().createFormulaEvaluator(); evaluator.evaluateFormulaCell(cell); CellValue cellValue = evaluator.evaluate(cell); strCell = String.valueOf(cellValue.getNumberValue()) ; break; default: strCell = ""; } return strCell; }}

调用方式如下

ExcelUtilTester.java

package pers.kangxu.datautils.test;import java.util.ArrayList;import java.util.List;import pers.kangxu.datautils.utils.ExcelUtil;public class ExcelUtilTester { public static void main(String[] args) { List<String[]> datas = new ArrayList<String[]>(); datas.add(new String[]{"狗熊","母","250"}); datas.add(new String[]{"猪粮","不明","251"}); //ExcelUtil.writeExcel("C:\\Users\\Administrator\\Desktop\\test\\test\\test.xls","sheet1",0, new String[]{"姓名","年龄","性别"}, datas); System.out.println(ExcelUtil.readExcel("C:\\Users\\Administrator\\Desktop\\test\\test\\test.xls", 0)); }}

以上就是本文的全部内容，希望本文的内容对大家的学习或者工作能带来一定的帮助，同时也希望多多支持！