项目需求:根据数据库生成员工Excel的模板,然后让客户根据模板填入数据,进行批量导入
操作如下:
1.Maven下导入jar包
<dependency> <groupId>org.apache.poi</groupId> <artifactId>poi</artifactId> <version>3.9</version> </dependency> <dependency> <groupId>org.apache.poi</groupId> <artifactId>poi-ooxml</artifactId> <version>3.9</version> </dependency> <dependency> <groupId>commons-lang</groupId> <artifactId>commons-lang</artifactId> <version>2.3</version> </dependency>2.放入ExcelUtil文件
主要方法:1.导出Excel文件:ExcelUtil.excelExport(标题列,文件名称,controller请求过来的response);
2.获取上传过来的Excel数据:ExcelUtil.getExcelData(文件上传过来的MultipartFile);
import org.apache.poi.hssf.usermodel.*; import org.apache.poi.ss.usermodel.*; import org.apache.poi.xssf.usermodel.XSSFWorkbook; import org.springframework.web.multipart.MultipartFile; import javax.servlet.http.HttpServletResponse; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.text.DecimalFormat; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.Date; import java.util.List; /** * Excel帮助类 */ public class ExcelUtil { /** * Excel导出数据 * @param titleList 标题列名 * @param title 文件名称 * @param response 响应 * @throws IOException */ public void excelExport(List<String> titleList, String title, HttpServletResponse response) throws IOException { OutputStream out=response.getOutputStream(); try { ExcelUtil excel = new ExcelUtil(); // 创建工作薄 HSSFWorkbook workbook = new HSSFWorkbook(); // 创建工作表 HSSFSheet sheet = workbook.createSheet(title); HSSFRow rows = sheet.createRow(0); // 设置样式 rows.setHeightInPoints(20); HSSFCellStyle cellStyle = workbook.createCellStyle(); cellStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER); // 居中 HSSFFont font = workbook.createFont(); font.setFontName("宋体"); font.setFontHeightInPoints((short) 200);//设置字体大小 font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);//粗体显示 cellStyle.setFont(font);//选择需要用到的字体格式 rows.setRowStyle(cellStyle); // 写入数据 for (int i = 0; i < titleList.size(); i++) { rows.createCell(i).setCellValue(titleList.get(i)); } //处理乱码问题 response.setContentType("application/x-download"); response.setCharacterEncoding("utf-8"); //设置浏览器响应头对应的Content-disposition response.setHeader("Content-disposition", "attachment;filename="+new String(title.getBytes("gbk"), "iso8859-1")+".xls"); workbook.write(out); } finally { if(out!=null){ out.close(); } } } /** * 上传excel文件解析返回数据 * @param file web上传过来的文件 * @return List的行数据 * @throws IOException */ public static List<String[]> getExcelData(MultipartFile file) throws IOException { // 检查文件是否存在 if (checkFile(file)) { return null; } ; //获得Workbook工作薄对象 Workbook workbook = getWorkBook(file); //创建返回对象，把每行中的值作为一个数组，所有行作为一个集合返回 List<String[]> list = new ArrayList<String[]>(); if (workbook != null) { for (int sheetNum = 0; sheetNum < workbook.getNumberOfSheets(); sheetNum++) { //获得当前sheet工作表 Sheet sheet = workbook.getSheetAt(sheetNum); if (sheet == null) { continue; } //获得当前sheet的开始行 int firstRowNum = sheet.getFirstRowNum(); //获得当前sheet的结束行 int lastRowNum = sheet.getLastRowNum(); //循环除了第一行的所有行 for (int rowNum = firstRowNum + 1; rowNum <= lastRowNum; rowNum++) { //获得当前行 Row row = sheet.getRow(rowNum); if (row == null) { continue; } //获得当前行的开始列 int firstCellNum = row.getFirstCellNum(); //获得当前行的列数 int lastCellNum = row.getLastCellNum(); String[] cells = new String[row.getLastCellNum()]; //循环当前行 for (int cellNum = firstCellNum; cellNum < lastCellNum; cellNum++) { Cell cell = row.getCell(cellNum); cells[cellNum] = getCellValue(cell); } list.add(cells); } } } return list; } /** * 检查文件 * * @param file * @throws IOException */ public static boolean checkFile(MultipartFile file) throws IOException { //判断文件是否存在 if (null == file) { return true; } //获得文件名 String fileName = file.getOriginalFilename(); //判断文件是否是excel文件 if (!fileName.endsWith("xls") && !fileName.endsWith("xlsx")) { return true; } return false; } public static Workbook getWorkBook(MultipartFile file) { //获得文件名 String fileName = file.getOriginalFilename(); //创建Workbook工作薄对象，表示整个excel Workbook workbook = null; try { //获取excel文件的io流 InputStream is = file.getInputStream(); //根据文件后缀名不同(xls和xlsx)获得不同的Workbook实现类对象 if (fileName.endsWith("xls")) { //2003 workbook = new HSSFWorkbook(is); } else if (fileName.endsWith("xlsx")) { //2007 及2007以上 workbook = new XSSFWorkbook(is); } } catch (IOException e) { e.printStackTrace(); } return workbook; } public static String getCellValue(Cell cell) { String cellValue = ""; if (cell == null) { return cellValue; } //判断数据的类型 switch (cell.getCellType()) { case Cell.CELL_TYPE_NUMERIC: //数字 // 如果是.0的小数,则转换为int的整数,否则返回double cellValue = cell.toString(); HSSFDataFormatter dataFormatter = new HSSFDataFormatter(); String cellFormatted = dataFormatter.formatCellValue(cell); cellValue=cellFormatted; break; case Cell.CELL_TYPE_STRING: //字符串 cellValue = String.valueOf(cell.getStringCellValue()); break; case Cell.CELL_TYPE_BOOLEAN: //Boolean cellValue = String.valueOf(cell.getBooleanCellValue()); break; case Cell.CELL_TYPE_FORMULA: //公式 cellValue = String.valueOf(cell.getCellFormula()); break; case Cell.CELL_TYPE_BLANK: //空值 cellValue = ""; break; case Cell.CELL_TYPE_ERROR: //故障 cellValue = "非法字符"; break; default: cellValue = "未知类型"; break; } return cellValue; } /** * 时间格式处理 * * @return */ public static String stringDateProcess(Cell cell) { String result = new String(); if (HSSFDateUtil.isCellDateFormatted(cell)) {// 处理日期格式、时间格式 SimpleDateFormat sdf = null; if (cell.getCellStyle().getDataFormat() == HSSFDataFormat.getBuiltinFormat("h:mm")) { sdf = new SimpleDateFormat("HH:mm"); } else {// 日期 sdf = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss"); } Date date = cell.getDateCellValue(); result = sdf.format(date); } else if (cell.getCellStyle().getDataFormat() == 58) { // 处理自定义日期格式：m月d日(通过判断单元格的格式id解决，id的值是58) SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss"); double value = cell.getNumericCellValue(); Date date = org.apache.poi.ss.usermodel.DateUtil .getJavaDate(value); result = sdf.format(date); } else { double value = cell.getNumericCellValue(); CellStyle style = cell.getCellStyle(); DecimalFormat format = new DecimalFormat(); String temp = style.getDataFormatString(); // 单元格设置成常规 if (temp.equals("General")) { format.applyPattern("#"); } result = format.format(value); } return result; } }部分代码(列入导出模板样式)可以根据注释自己需求进行改进
