java项目中Excel文件的导入导出
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1 package poi.excel; 2 3 import java.io.IOException; 4 import java.io.InputStream; 5 import java.io.OutputStream; 6 import java.lang.reflect.Field; 7 import java.lang.reflect.Method; 8 import java.util.ArrayList; 9 import java.util.List; 10 11 import javax.servlet.http.HttpServletRequest; 12 13 import org.apache.log4j.Logger; 14 import org.apache.poi.hssf.usermodel.HSSFCell; 15 import org.apache.poi.hssf.usermodel.HSSFCellStyle; 16 import org.apache.poi.hssf.usermodel.HSSFFont; 17 import org.apache.poi.hssf.usermodel.HSSFRichTextString; 18 import org.apache.poi.hssf.usermodel.HSSFRow; 19 import org.apache.poi.hssf.usermodel.HSSFSheet; 20 import org.apache.poi.hssf.usermodel.HSSFWorkbook; 21 import org.apache.poi.hssf.util.HSSFColor; 22 import org.apache.poi.ss.usermodel.Cell; 23 import org.apache.poi.ss.usermodel.Row; 24 import org.apache.poi.ss.usermodel.Sheet; 25 import org.apache.poi.ss.usermodel.Workbook; 26 import org.apache.poi.xssf.usermodel.XSSFWorkbook; 27 28 29 30 /** 31 * @ClassName: ExcelUtil 32 * @Description: Excel导入导出工具类 33 * @author 周宣 34 * @date 2016-11-8 下午7:16:11 35 * 36 */ 37 public class ExcelUtil { 38 private static final Logger logger = Logger.getLogger(ExcelUtil.class); 39 40 /** 41 * @Title: createWorkbook 42 * @Description: 判断excel文件后缀名，生成不同的workbook 43 * @param @param is 44 * @param @param excelFileName 45 * @param @return 46 * @param @throws IOException 47 * @return Workbook 48 * @throws 49 */ 50 public Workbook createWorkbook(InputStream is,String excelFileName) throws IOException{ 51 if (excelFileName.endsWith(".xls")) { 52 return new HSSFWorkbook(is); 53 }else if (excelFileName.endsWith(".xlsx")) { 54 return new XSSFWorkbook(is); 55 } 56 return null; 57 } 58 59 /** 60 * @Title: getSheet 61 * @Description: 根据sheet索引号获取对应的sheet 62 * @param @param workbook 63 * @param @param sheetIndex 64 * @param @return 65 * @return Sheet 66 * @throws 67 */ 68 public Sheet getSheet(Workbook workbook,int sheetIndex){ 69 return workbook.getSheetAt(0); 70 } 71 72 /** 73 * @Title: importDataFromExcel 74 * @Description: 将sheet中的数据保存到list中， 75 * 1、调用此方法时，vo的属性个数必须和excel文件每行数据的列数相同且一一对应，vo的所有属性都为String 76 * 2、在action调用此方法时，需声明 77 * private File excelFile;上传的文件 78 * private String excelFileName;原始文件的文件名 79 * 3、页面的file控件name需对应File的文件名 80 * @param @param vo javaBean 81 * @param @param is 输入流 82 * @param @param excelFileName 83 * @param @return 84 * @return List<Object> 85 * @throws 86 */ 87 public List<Object> importDataFromExcel(Object vo,InputStream is,String excelFileName){ 88 List<Object> list = new ArrayList<Object>(); 89 try { 90 //创建工作簿 91 Workbook workbook = this.createWorkbook(is, excelFileName); 92 //创建工作表sheet 93 Sheet sheet = this.getSheet(workbook, 0); 94 //获取sheet中数据的行数 95 int rows = sheet.getPhysicalNumberOfRows(); 96 //获取表头单元格个数 97 int cells = sheet.getRow(0).getPhysicalNumberOfCells(); 98 //利用反射，给JavaBean的属性进行赋值 99 Field[] fields = vo.getClass().getDeclaredFields(); 100 for (int i = 1; i < rows; i++) {//第一行为标题栏，从第二行开始取数据 101 Row row = sheet.getRow(i); 102 int index = 0; 103 while (index < cells) { 104 Cell cell = row.getCell(index); 105 if (null == cell) { 106 cell = row.createCell(index); 107 } 108 cell.setCellType(Cell.CELL_TYPE_STRING); 109 String value = null == cell.getStringCellValue()?"":cell.getStringCellValue(); 110 111 Field field = fields[index]; 112 String fieldName = field.getName(); 113 String methodName = "set"+fieldName.substring(0,1).toUpperCase()+fieldName.substring(1); 114 Method setMethod = vo.getClass().getMethod(methodName, new Class[]{String.class}); 115 setMethod.invoke(vo, new Object[]{value}); 116 index++; 117 } 118 if (isHasValues(vo)) {//判断对象属性是否有值 119 list.add(vo); 120 vo.getClass().getConstructor(new Class[]{}).newInstance(new Object[]{});//重新创建一个vo对象 121 } 122 123 } 124 } catch (Exception e) { 125 logger.error(e); 126 }finally{ 127 try { 128 is.close();//关闭流 129 } catch (Exception e2) { 130 logger.error(e2); 131 } 132 } 133 return list; 134 135 } 136 137 /** 138 * @Title: isHasValues 139 * @Description: 判断一个对象所有属性是否有值，如果一个属性有值(分空)，则返回true 140 * @param @param object 141 * @param @return 142 * @return boolean 143 * @throws 144 */ 145 public boolean isHasValues(Object object){ 146 Field[] fields = object.getClass().getDeclaredFields(); 147 boolean flag = false; 148 for (int i = 0; i < fields.length; i++) { 149 String fieldName = fields[i].getName(); 150 String methodName = "get"+fieldName.substring(0, 1).toUpperCase()+fieldName.substring(1); 151 Method getMethod; 152 try { 153 getMethod = object.getClass().getMethod(methodName); 154 Object obj = getMethod.invoke(object); 155 if (null != obj && "".equals(obj)) { 156 flag = true; 157 break; 158 } 159 } catch (Exception e) { 160 logger.error(e); 161 } 162 163 } 164 return flag; 165 166 } 167 168 public <T> void exportDataToExcel(List<T> list,String[] headers,String title,OutputStream os){ 169 HSSFWorkbook workbook = new HSSFWorkbook(); 170 //生成一个表格 171 HSSFSheet sheet = workbook.createSheet(title); 172 //设置表格默认列宽15个字节 173 sheet.setDefaultColumnWidth(15); 174 //生成一个样式 175 HSSFCellStyle style = this.getCellStyle(workbook); 176 //生成一个字体 177 HSSFFont font = this.getFont(workbook); 178 //把字体应用到当前样式 179 style.setFont(font); 180 181 //生成表格标题 182 HSSFRow row = sheet.createRow(0); 183 row.setHeight((short)300); 184 HSSFCell cell = null; 185 186 for (int i = 0; i < headers.length; i++) { 187 cell = row.createCell(i); 188 cell.setCellStyle(style); 189 HSSFRichTextString text = new HSSFRichTextString(headers[i]); 190 cell.setCellValue(text); 191 } 192 193 //将数据放入sheet中 194 for (int i = 0; i < list.size(); i++) { 195 row = sheet.createRow(i+1); 196 T t = list.get(i); 197 //利用反射，根据JavaBean属性的先后顺序，动态调用get方法得到属性的值 198 Field[] fields = t.getClass().getFields(); 199 try { 200 for (int j = 0; j < fields.length; j++) { 201 cell = row.createCell(j); 202 Field field = fields[j]; 203 String fieldName = field.getName(); 204 String methodName = "get"+fieldName.substring(0, 1).toUpperCase()+fieldName.substring(1); 205 Method getMethod = t.getClass().getMethod(methodName,new Class[]{}); 206 Object value = getMethod.invoke(t, new Object[]{}); 207 208 if(null == value) 209 value =""; 210 cell.setCellValue(value.toString()); 211 212 } 213 } catch (Exception e) { 214 logger.error(e); 215 } 216 } 217 218 try { 219 workbook.write(os); 220 } catch (Exception e) { 221 logger.error(e); 222 }finally{ 223 try { 224 os.flush(); 225 os.close(); 226 } catch (IOException e) { 227 logger.error(e); 228 } 229 } 230 231 } 232 233 /** 234 * @Title: getCellStyle 235 * @Description: 获取单元格格式 236 * @param @param workbook 237 * @param @return 238 * @return HSSFCellStyle 239 * @throws 240 */ 241 public HSSFCellStyle getCellStyle(HSSFWorkbook workbook){ 242 HSSFCellStyle style = workbook.createCellStyle(); 243 style.setFillForegroundColor(HSSFColor.GREY_25_PERCENT.index); 244 style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND); 245 style.setBorderBottom(HSSFCellStyle.BORDER_THIN); 246 style.setBorderTop(HSSFCellStyle.BORDER_THIN); 247 style.setLeftBorderColor(HSSFCellStyle.BORDER_THIN); 248 style.setRightBorderColor(HSSFCellStyle.BORDER_THIN); 249 style.setAlignment(HSSFCellStyle.ALIGN_CENTER); 250 251 return style; 252 } 253 254 /** 255 * @Title: getFont 256 * @Description: 生成字体样式 257 * @param @param workbook 258 * @param @return 259 * @return HSSFFont 260 * @throws 261 */ 262 public HSSFFont getFont(HSSFWorkbook workbook){ 263 HSSFFont font = workbook.createFont(); 264 font.setColor(HSSFColor.WHITE.index); 265 font.setFontHeightInPoints((short)12); 266 font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD); 267 return font; 268 } 269 270 public boolean isIE(HttpServletRequest request){ 271 return request.getHeader("USER-AGENT").toLowerCase().indexOf("msie")>0?true:false; 272 } 273 }
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