excel导出
1.工具类
import org.apache.poi.hssf.usermodel.HSSFWorkbook; import org.apache.poi.ss.usermodel.Cell; 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; import org.apache.poi.xssf.usermodel.*; import java.beans.IntrospectionException; import java.beans.PropertyDescriptor; import java.io.InputStream; import java.lang.reflect.InvocationTargetException; import java.lang.reflect.Method; import java.math.BigDecimal; import java.text.DecimalFormat; import java.text.NumberFormat; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.Date; import java.util.List; import java.util.Map; public class ExcelUtil { private final static String excel2003L =".xls"; //2003- 版本的excel private final static String excel2007U =".xlsx"; //2007+ 版本的excel /** * Excel导入 */ public static List<List<Object>> getBankListByExcel(InputStream in, String fileName) throws Exception{ List<List<Object>> list = null; //创建Excel工作薄 Workbook work = getWorkbook(in,fileName); if(null == work){ throw new Exception("创建Excel工作薄为空！"); } Sheet sheet = null; Row row = null; Cell cell = null; list = new ArrayList<List<Object>>(); //遍历Excel中所有的sheet for (int i = 0; i < work.getNumberOfSheets(); i++) { sheet = work.getSheetAt(i); if(sheet==null){continue;} //遍历当前sheet中的所有行 //包涵头部，所以要小于等于最后一列数,这里也可以在初始值加上头部行数，以便跳过头部 for (int j = sheet.getFirstRowNum(); j <= sheet.getLastRowNum(); j++) { //读取一行 row = sheet.getRow(j); //去掉空行和表头 if(row==null||row.getFirstCellNum()==j){continue;} //遍历所有的列 List<Object> li = new ArrayList<Object>(); for (int y = row.getFirstCellNum(); y < row.getLastCellNum(); y++) { cell = row.getCell(y); li.add(getCellValue(cell)); } list.add(li); } } return list; } /** * 描述：根据文件后缀，自适应上传文件的版本 */ public static Workbook getWorkbook(InputStream inStr,String fileName) throws Exception{ Workbook wb = null; String fileType = fileName.substring(fileName.lastIndexOf(".")); if(excel2003L.equals(fileType)){ wb = new HSSFWorkbook(inStr); //2003- }else if(excel2007U.equals(fileType)){ wb = new XSSFWorkbook(inStr); //2007+ }else{ throw new Exception("解析的文件格式有误！"); } return wb; } /** * 描述：对表格中数值进行格式化 */ public static Object getCellValue(Cell cell){ Object value = null; DecimalFormat df = new DecimalFormat("0"); //格式化字符类型的数字 SimpleDateFormat sdf = new SimpleDateFormat("yyy-MM-dd"); //日期格式化 DecimalFormat df2 = new DecimalFormat("0.00"); //格式化数字 switch (cell.getCellType()) { case Cell.CELL_TYPE_STRING: value = cell.getRichStringCellValue().getString(); break; case Cell.CELL_TYPE_NUMERIC: if("General".equals(cell.getCellStyle().getDataFormatString())){ value = df.format(cell.getNumericCellValue()); }else if("m/d/yy".equals(cell.getCellStyle().getDataFormatString())){ value = sdf.format(cell.getDateCellValue()); }else{ value = df2.format(cell.getNumericCellValue()); } break; case Cell.CELL_TYPE_BOOLEAN: value = cell.getBooleanCellValue(); break; case Cell.CELL_TYPE_BLANK: value = ""; break; default: break; } return value; } /** * 导入Excel表结束 * 导出Excel表开始 * @param sheetName 工作簿名称 * @param clazz 数据源model类型 * @param objs excel标题列以及对应model字段名 * @param map 标题列行数以及cell字体样式 */ public static XSSFWorkbook createExcelFile(Class clazz, List objs, Map<Integer, List<ExcelBean>> map, String sheetName) throws IllegalArgumentException,IllegalAccessException,InvocationTargetException, ClassNotFoundException, IntrospectionException, ParseException { // 创建新的Excel工作簿 XSSFWorkbook workbook = new XSSFWorkbook(); // 在Excel工作簿中建一工作表，其名为缺省值, 也可以指定Sheet名称 XSSFSheet sheet = workbook.createSheet(sheetName); // 以下为excel的字体样式以及excel的标题与内容的创建，下面会具体分析; createFont(workbook); //字体样式 createTableHeader(sheet, map); //创建标题（头） createTableRows(sheet, map, objs, clazz); //创建内容 return workbook; } private static XSSFCellStyle fontStyle; private static XSSFCellStyle fontStyle2; public static void createFont(XSSFWorkbook workbook) { // 表头 fontStyle = workbook.createCellStyle(); XSSFFont font1 = workbook.createFont(); font1.setBoldweight(XSSFFont.BOLDWEIGHT_BOLD); font1.setFontName("黑体"); font1.setFontHeightInPoints((short) 12);// 设置字体大小 fontStyle.setFont(font1); fontStyle.setBorderBottom(XSSFCellStyle.BORDER_THIN); // 下边框 fontStyle.setBorderLeft(XSSFCellStyle.BORDER_THIN);// 左边框 fontStyle.setBorderTop(XSSFCellStyle.BORDER_THIN);// 上边框 fontStyle.setBorderRight(XSSFCellStyle.BORDER_THIN);// 右边框 fontStyle.setAlignment(XSSFCellStyle.ALIGN_CENTER); // 居中 // 内容 fontStyle2=workbook.createCellStyle(); XSSFFont font2 = workbook.createFont(); font2.setFontName("宋体"); font2.setFontHeightInPoints((short) 10);// 设置字体大小 fontStyle2.setFont(font2); fontStyle2.setBorderBottom(XSSFCellStyle.BORDER_THIN); // 下边框 fontStyle2.setBorderLeft(XSSFCellStyle.BORDER_THIN);// 左边框 fontStyle2.setBorderTop(XSSFCellStyle.BORDER_THIN);// 上边框 fontStyle2.setBorderRight(XSSFCellStyle.BORDER_THIN);// 右边框 fontStyle2.setAlignment(XSSFCellStyle.ALIGN_CENTER); // 居中 } /** * 根据ExcelMapping 生成列头（多行列头） * * @param sheet 工作簿 * @param map 每行每个单元格对应的列头信息 */ public static final void createTableHeader(XSSFSheet sheet, Map<Integer, List<ExcelBean>> map) { int startIndex=0;//cell起始位置 int endIndex=0;//cell终止位置 for (Map.Entry<Integer, List<ExcelBean>> entry : map.entrySet()) { XSSFRow row = sheet.createRow(entry.getKey()); List<ExcelBean> excels = entry.getValue(); for (int x = 0; x < excels.size(); x++) { //合并单元格 if(excels.get(x).getCols()>1){ if(x==0){ endIndex+=excels.get(x).getCols()-1; CellRangeAddress range=new CellRangeAddress(0,0,startIndex,endIndex); sheet.addMergedRegion(range); startIndex+=excels.get(x).getCols(); }else{ endIndex+=excels.get(x).getCols(); CellRangeAddress range=new CellRangeAddress(0,0,startIndex,endIndex); sheet.addMergedRegion(range); startIndex+=excels.get(x).getCols(); } XSSFCell cell = row.createCell(startIndex-excels.get(x).getCols()); cell.setCellValue(excels.get(x).getHeadTextName());// 设置内容 if (excels.get(x).getCellStyle() != null) { cell.setCellStyle(excels.get(x).getCellStyle());// 设置格式 } cell.setCellStyle(fontStyle); }else{ XSSFCell cell = row.createCell(x); cell.setCellValue(excels.get(x).getHeadTextName());// 设置内容 if (excels.get(x).getCellStyle() != null) { cell.setCellStyle(excels.get(x).getCellStyle());// 设置格式 } cell.setCellStyle(fontStyle); } } } } public static void createTableRows(XSSFSheet sheet, Map<Integer, List<ExcelBean>> map, List objs, Class clazz) throws IllegalArgumentException, IllegalAccessException, InvocationTargetException, IntrospectionException, ClassNotFoundException, ParseException { int rowindex = map.size(); int maxKey = 0; List<ExcelBean> ems = new ArrayList<ExcelBean>(); for (Map.Entry<Integer, List<ExcelBean>> entry : map.entrySet()) { if (entry.getKey() > maxKey) { maxKey = entry.getKey(); } } ems = map.get(maxKey); List<Integer> widths = new ArrayList<Integer>(ems.size()); for (Object obj : objs) { XSSFRow row = sheet.createRow(rowindex); for (int i = 0; i < ems.size(); i++) { ExcelBean em = (ExcelBean) ems.get(i); // 获得get方法 PropertyDescriptor pd = new PropertyDescriptor(em.getPropertyName(), clazz); Method getMethod = pd.getReadMethod(); Object rtn = getMethod.invoke(obj); String value = ""; // 如果是日期类型进行转换 if (rtn != null) { if (rtn instanceof Date) { value = DateUtils.getDate("yyyy-MM-dd",(Date)rtn); } else if(rtn instanceof BigDecimal){ NumberFormat nf = new DecimalFormat("#,##0.00"); value=nf.format((BigDecimal)rtn).toString(); } else if((rtn instanceof Integer) && (Integer.valueOf(rtn.toString())<0 )){ value="--"; }else { value = rtn.toString(); } } XSSFCell cell = row.createCell(i); cell.setCellValue(value); cell.setCellType(XSSFCell.CELL_TYPE_STRING); cell.setCellStyle(fontStyle2); // 获得最大列宽 int width = value.getBytes().length * 300; // 还未设置，设置当前 if (widths.size() <= i) { widths.add(width); continue; } // 比原来大，更新数据 if (width > widths.get(i)) { widths.set(i, width); } } rowindex++; } // 设置列宽 for (int index = 0; index < widths.size(); index++) { Integer width = widths.get(index); width = width < 2500 ? 2500 : width + 300; width = width > 10000 ? 10000 + 300 : width + 300; sheet.setColumnWidth(index, width); } } }
2.controller调用
import SSM.model.Card; import SSM.utils.ExcelBean; import SSM.utils.ExcelUtil; import org.apache.poi.xssf.usermodel.XSSFWorkbook; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.ResponseBody; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.OutputStream; import java.io.UnsupportedEncodingException; import java.net.URLEncoder; import java.util.*; /** * @author zhouhe * @date 2020/7/14 17:06 */ @Controller @RequestMapping("/test") public class Test { /** * 导出 * @param request * @param response */ @RequestMapping("/list/export") public @ResponseBody void listexport(HttpServletRequest request, HttpServletResponse response) { XSSFWorkbook wb = exportExcelList(); response.setContentType("application/vnd.ms-excel"); String filename="流量统计.xlsx"; try { response.setHeader("content-disposition", "attachment;filename="+ URLEncoder.encode(filename, "UTF-8") ); } catch (UnsupportedEncodingException e1) { e1.printStackTrace(); } OutputStream ouputStream = null; try { ouputStream = response.getOutputStream(); wb.write(ouputStream); } catch (Exception e) { throw new RuntimeException("系统异常"); } finally { try { ouputStream.flush(); ouputStream.close(); } catch (Exception e) { throw new RuntimeException("系统异常"); } } } /** * 导出excel * @return */ public static XSSFWorkbook exportExcelList() { try { //这个数据可以从数据库中读取 List<Card> list = new ArrayList<Card>(); List<ExcelBean> excel = new ArrayList<ExcelBean>(); Map<Integer, List<ExcelBean>> map = new LinkedHashMap<Integer, List<ExcelBean>>(); XSSFWorkbook xssfWorkbook = null; //设置标题栏 excel.add(new ExcelBean("卡号", "iccid", 0)); excel.add(new ExcelBean("当月已用(MB)", "flow", 0)); excel.add(new ExcelBean("昨日用量(MB)", "yesterdayflow", 0)); map.put(0, excel); String sheetName = "流量统计"; //调用ExcelUtil的方法 xssfWorkbook = ExcelUtil.createExcelFile(Card.class, list, map, sheetName); return xssfWorkbook; }catch (Exception e){ e.printStackTrace(); } return null; } }
