基于ssm的选课管理系统-毕业设计

package com.cms.utils; 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.SimpleDateFormat; import java.util.ArrayList; import java.util.Date; import java.util.List; import java.util.Map; 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 com.cms.dto.ExcelBean; 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 // +1跳过头部 for (int j = sheet.getFirstRowNum(); j <= sheet.getLastRowNum(); j++) { boolean isAdd = true; // 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); if (cell != null && cell.getCellType() != Cell.CELL_TYPE_BLANK) { li.add(getCellValue(cell)); } else if (y == 0) {// Excel中一行所有列中有空列则不加入 isAdd = false; break; } } if (isAdd) 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; } /** * 导出 */ public static XSSFWorkbook createExcelFile(Class clazz, List objs, Map<Integer, List<ExcelBean>> map, String sheetName) throws IllegalArgumentException, IllegalAccessException, InvocationTargetException, ClassNotFoundException, IntrospectionException { // 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.setFontName("黑体"); font1.setFontHeightInPoints((short) 14);// 设置字体大小 fontStyle.setFont(font1); // 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); } /** * 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 { 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 = ""; if (rtn != null) { if (rtn instanceof Date) {