1、jar包：poi-3.14-20160307.jar、poi-ooxml-3.14-20160307.jar
2、导入（本例实现了解析excel生成List）：
@Override public Map<String, Object> parseExcel(String fileName) { // 1.准备返回的变量 Map<String, Object> resultMap = new HashMap<String, Object>(); String message = "success"; List<Stone> stones = new ArrayList<Stone>(); boolean isE2007 = false; // 判断是否是excel2007格式 if (fileName.endsWith("xlsx")) { isE2007 = true; } SimpleDateFormat fmt = new SimpleDateFormat("yyyy-MM-dd"); // 2.准备workbook // 同时支持Excel 2003、2007 File excelFile = new File(fileName); // 创建文件对象 Workbook workbook = null; // 根据文件格式(2003或者2007)来初始化 try { FileInputStream is = new FileInputStream(excelFile); // 文件流 if (isE2007) { workbook = new XSSFWorkbook(is); } else { workbook = new HSSFWorkbook(is); } } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } // 3.遍历集合，组装结果 int sheetCount = workbook.getNumberOfSheets(); // Sheet的数量 // 遍历每个Sheet for (int s = 0; s < sheetCount; s++) { Sheet sheet = workbook.getSheetAt(s); int rowCount = sheet.getPhysicalNumberOfRows(); // 获取总行数 // 遍历每一行 for (int r = 1; r < rowCount; r++) { Stone stone = new Stone(); Row row = sheet.getRow(r); int cellCount = row.getPhysicalNumberOfCells(); // 获取总列数 // 遍历每一列 for (int c = 0; c < cellCount; c++) { Cell cell = row.getCell(c); int cellType = cell.getCellType(); String cellStringValue = null; switch (cellType) { case Cell.CELL_TYPE_STRING: // 文本 cellStringValue = cell.getStringCellValue(); break; case Cell.CELL_TYPE_NUMERIC: // 数字、日期 if (DateUtil.isCellDateFormatted(cell)) { cellStringValue = fmt.format(cell.getDateCellValue()); // 日期型 } else { cellStringValue = String.valueOf(cell.getNumericCellValue()); // 数字 if (cellStringValue.contains("E")) { cellStringValue = String.valueOf(new Double(cell.getNumericCellValue()).longValue()); // 数字 } } break; case Cell.CELL_TYPE_BOOLEAN: // 布尔型 cellStringValue = String.valueOf(cell.getBooleanCellValue()); break; case Cell.CELL_TYPE_BLANK: // 空白 cellStringValue = cell.getStringCellValue(); break; case Cell.CELL_TYPE_ERROR: // 错误 cellStringValue = "错误"; break; case Cell.CELL_TYPE_FORMULA: // 公式 cellStringValue = "错误"; break; default: cellStringValue = "错误"; } if (cellStringValue.equals("错误")) { message = "解析Excel时发生错误，第[" + (s + 1) + "]sheet，第[" + (row.getRowNum() + 1) + "]行，第[" + (c + 1) + "]列解析错误"; resultMap.put("message", message); return resultMap; } cellStringValue = cellStringValue.trim(); switch (c) { case ConstantsUtil.STONE_EXCEL_COLUMN_STONEID: try { new Long(cellStringValue); } catch (NumberFormatException e) { message = "解析Excel时发生错误，第[" + (s + 1) + "]sheet，第[" + (row.getRowNum() + 1) + "]行，第[" + (c + 1) + "]列值类型转换异常"; resultMap.put("message", message); return resultMap; } stone.setStoneId(new Long(cellStringValue)); break; case ConstantsUtil.STONE_EXCEL_COLUMN_SHAPE: stone.setShape(cellStringValue); break; case ConstantsUtil.STONE_EXCEL_COLUMN_CARAT: try { new Double(cellStringValue); } catch (NumberFormatException e) { message = "解析Excel时发生错误，第[" + (s + 1) + "]sheet，第[" + (row.getRowNum() + 1) + "]行，第[" + (c + 1) + "]列值类型转换异常"; resultMap.put("message", message); return resultMap; } stone.setCarat(new Double(cellStringValue)); break; case ConstantsUtil.STONE_EXCEL_COLUMN_COLOUR: stone.setColour(cellStringValue); break; case ConstantsUtil.STONE_EXCEL_COLUMN_CLARITY: stone.setClarity(cellStringValue); break; case ConstantsUtil.STONE_EXCEL_COLUMN_CUT: stone.setCut(cellStringValue); break; case ConstantsUtil.STONE_EXCEL_COLUMN_POLISH: stone.setPolish(cellStringValue); break; case ConstantsUtil.STONE_EXCEL_COLUMN_SYM: stone.setSym(cellStringValue); break; case ConstantsUtil.STONE_EXCEL_COLUMN_FLUOR: stone.setFluor(cellStringValue); break; case ConstantsUtil.STONE_EXCEL_COLUMN_DIAMETER: try { new Double(cellStringValue); } catch (NumberFormatException e) { message = "解析Excel时发生错误，第[" + (s + 1) + "]sheet，第[" + (row.getRowNum() + 1) + "]行，第[" + (c + 1) + "]列值类型转换异常"; resultMap.put("message", message); return resultMap; } stone.setDiameter(new Double(cellStringValue)); break; case ConstantsUtil.STONE_EXCEL_COLUMN_PLENGTH: try { new Double(cellStringValue); } catch (NumberFormatException e) { message = "解析Excel时发生错误，第[" + (s + 1) + "]sheet，第[" + (row.getRowNum() + 1) + "]行，第[" + (c + 1) + "]列值类型转换异常"; resultMap.put("message", message); return resultMap; } stone.setpLength(new Double(cellStringValue)); break; case ConstantsUtil.STONE_EXCEL_COLUMN_PWEIGHT: try { new Double(cellStringValue); } catch (NumberFormatException e) { message = "解析Excel时发生错误，第[" + (s + 1) + "]sheet，第[" + (row.getRowNum() + 1) + "]行，第[" + (c + 1) + "]列值类型转换异常"; resultMap.put("message", message); return resultMap; } stone.setpWeight(new Double(cellStringValue)); break; case ConstantsUtil.STONE_EXCEL_COLUMN_PDEPTH: try { new Double(cellStringValue); } catch (NumberFormatException e) { message = "解析Excel时发生错误，第[" + (s + 1) + "]sheet，第[" + (row.getRowNum() + 1) + "]行，第[" + (c + 1) + "]列值类型转换异常"; resultMap.put("message", message); return resultMap; } stone.setpDepth(new Double(cellStringValue)); break; case ConstantsUtil.STONE_EXCEL_COLUMN_PDEPTHPER: try { new Double(cellStringValue); } catch (NumberFormatException e) { message = "解析Excel时发生错误，第[" + (s + 1) + "]sheet，第[" + (row.getRowNum() + 1) + "]行，第[" + (c + 1) + "]列值类型转换异常"; resultMap.put("message", message); return resultMap; } stone.setpDepthPer(new Double(cellStringValue)); break; case ConstantsUtil.STONE_EXCEL_COLUMN_PTABLE: try { new Double(cellStringValue); } catch (NumberFormatException e) { message = "解析Excel时发生错误，第[" + (s + 1) + "]sheet，第[" + (row.getRowNum() + 1) + "]行，第[" + (c + 1) + "]列值类型转换异常"; resultMap.put("message", message); return resultMap; } stone.setpTable(new Double(cellStringValue)); break; case ConstantsUtil.STONE_EXCEL_COLUMN_LAB: stone.setLab(cellStringValue); break; case ConstantsUtil.STONE_EXCEL_COLUMN_CERTIID: stone.setCertiId(cellStringValue); break; case ConstantsUtil.STONE_EXCEL_COLUMN_STOCKIN: Integer stockIn = 0; if ("是".equals(cellStringValue)) { stockIn = 1; } stone.setStockIn(stockIn); break; case ConstantsUtil.STONE_EXCEL_COLUMN_STOCKCITY: stone.setStockCity(cellStringValue); break; case ConstantsUtil.STONE_EXCEL_COLUMN_SINGLEPRICE: try { new BigDecimal(cellStringValue); } catch (NumberFormatException e) { message = "解析Excel时发生错误，第[" + (s + 1) + "]sheet，第[" + (row.getRowNum() + 1) + "]行，第[" + (c + 1) + "]列值类型转换异常"; resultMap.put("message", message); return resultMap; } stone.setSinglePrice(new BigDecimal(cellStringValue)); break; default: message = "解析Excel时发生错误，第[" + (row.getRowNum() + 1) + "]行，第[" + (c + 1) + "]列不应该有值"; resultMap.put("message", message); return resultMap; } } stone.setIsOnSale(false); stone.setIsDelete(false); stones.add(stone); } } resultMap.put("message", message); resultMap.put("stones", stones); return resultMap; }
3、导出
import java.io.FileOutputStream; import java.io.IOException; import java.util.List; import org.apache.poi.hssf.usermodel.HSSFCell; import org.apache.poi.hssf.usermodel.HSSFCellStyle; import org.apache.poi.hssf.usermodel.HSSFFont; import org.apache.poi.hssf.usermodel.HSSFRow; import org.apache.poi.hssf.usermodel.HSSFSheet; import org.apache.poi.hssf.usermodel.HSSFWorkbook; import org.apache.poi.hssf.util.HSSFColor; import com.alibaba.fastjson.JSON; class DataInfo { private String countDate; // 统计日期 private String channelId; // 渠道号 public String getCountDate() { return countDate; } public void setCountDate(String countDate) { this.countDate = countDate; } public String getChannelId() { return channelId; } public void setChannelId(String channelId) { this.channelId = channelId; } }; public class TestExport { public static void main(String[] args) throws IOException { // 创建 HSSFWorkbook wb = new HSSFWorkbook(); HSSFSheet sheet = wb.createSheet(); // 创建单元格样式 HSSFCellStyle titleCellStyle = wb.createCellStyle(); // 指定单元格居中对齐，边框为细 titleCellStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER); titleCellStyle.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER); titleCellStyle.setBorderTop(HSSFCellStyle.BORDER_THIN); titleCellStyle.setBorderBottom(HSSFCellStyle.BORDER_THIN); titleCellStyle.setBorderRight(HSSFCellStyle.BORDER_THIN); titleCellStyle.setBorderLeft(HSSFCellStyle.BORDER_THIN); // 设置填充色 titleCellStyle.setFillForegroundColor(HSSFColor.SKY_BLUE.index); titleCellStyle.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND); // 指定当单元格内容显示不下时自动换行 titleCellStyle.setWrapText(true); // 设置单元格字体 HSSFFont titleFont = wb.createFont(); titleFont.setFontHeightInPoints((short) 12); titleFont.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD); titleCellStyle.setFont(titleFont); HSSFRow headerRow = sheet.createRow(0); HSSFCell headerCell = null; String[] titles = { "统计日期", "渠道号" }; for (int c = 0; c < titles.length; c++) { headerCell = headerRow.createCell(c); headerCell.setCellStyle(titleCellStyle); headerCell.setCellValue(titles[c]); sheet.setColumnWidth(c, (30 * 160)); } // ------------------------------------------------------------------ // 创建单元格样式 HSSFCellStyle cellStyle = wb.createCellStyle(); // 指定单元格居中对齐，边框为细 cellStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER); cellStyle.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER); cellStyle.setBorderTop(HSSFCellStyle.BORDER_THIN); cellStyle.setBorderBottom(HSSFCellStyle.BORDER_THIN); cellStyle.setBorderRight(HSSFCellStyle.BORDER_THIN); cellStyle.setBorderLeft(HSSFCellStyle.BORDER_THIN); // 设置单元格字体 HSSFFont font = wb.createFont(); titleFont.setFontHeightInPoints((short) 11); font.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL); cellStyle.setFont(font); String infoStr = "[{"channelId":"bodao","countDate":"2014-06-11"}," + "{"channelId":"dingzhi","countDate":"2014-06-12"}," + "{"channelId":"ruiwei","countDate":"2014-06-13"}]"; List<DataInfo> list = JSON.parseArray(infoStr, DataInfo.class); for (int r = 0; r < list.size(); r++) { DataInfo item = list.get(r); HSSFRow row = sheet.createRow(r + 1); HSSFCell cell = null; int c = 0; cell = row.createCell(c++); cell.setCellStyle(cellStyle); cell.setCellValue(item.getCountDate()); cell = row.createCell(c++); cell.setCellStyle(cellStyle); cell.setCellValue(item.getChannelId()); } FileOutputStream fileOut = new FileOutputStream("E:/test/test.xls"); wb.write(fileOut); fileOut.close(); System.out.println("Done"); } }
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