利用Apache POI和Java反射开发一个excel导出工具类

 一个通用的excel工具类POIExcelUtil。现分享一下代码。

import java.io.File;  import java.io.FileOutputStream;  import java.io.IOException;  import java.lang.reflect.InvocationTargetException;  import java.lang.reflect.Method;  import java.util.Iterator;  import java.util.List;  import java.util.Map;  import java.util.Set;    import org.apache.poi.hssf.usermodel.HSSFWorkbook;  import org.apache.poi.ss.usermodel.Cell;  import org.apache.poi.ss.usermodel.CreationHelper;  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.xssf.usermodel.XSSFWorkbook;    public class POIExcelUtil {      public static final String FILE_EXTENSION_XLS = "xls";   public static final String FILE_EXTENSION_XLSX = "xlsx";     /**    *     * @param Map    *            <String,String> maps 属性表，成员属性age为KEY，中文名称为VALUE    * @param List    *            <T> list 需要导出的数据列表对象    * @param File    *            file 指定输出文件位置，只能导出excel2003以上版本    *                * @return true 导出成功 false 导出失败    */   public static <T> boolean excelExport(Map<String, String> maps, List<T> list, File file) {      try {     Workbook wb = null;     String filename = file.getName();     String type = filename.substring(filename.lastIndexOf(".")+1).toLowerCase();     if (type.equals(FILE_EXTENSION_XLS)) {      wb = new HSSFWorkbook();     }     if (type.equals(FILE_EXTENSION_XLSX)) {      wb = new XSSFWorkbook();     }     CreationHelper createHelper = wb.getCreationHelper();     Sheet sheet = wb.createSheet("sheet1");     Set<String> sets = maps.keySet();     Row row = sheet.createRow(0);     int i = 0;     // 定义表头     for (Iterator<String> it = sets.iterator(); it.hasNext();) {      String key = it.next();      Cell cell = row.createCell(i++);         cell.setCellValue(createHelper.createRichTextString(maps.get(key)));     }     // 填充表单内容     System.out.println("--------------------100%");     float avg = list.size() / 20f;     int count = 1;     for (int j = 0; j < list.size(); j++) {      T p = list.get(j);      Class classType = p.getClass();      int index = 0;      Row row1 = sheet.createRow(j+1);      for (Iterator<String> it = sets.iterator(); it.hasNext();) {       String key = it.next();       String firstLetter = key.substring(0, 1).toUpperCase();       // 获得和属性对应的getXXX()方法的名字       String getMethodName = "get" + firstLetter+ key.substring(1);       // 获得和属性对应的getXXX()方法       Method getMethod = classType.getMethod(getMethodName,new Class[] {});       // 调用原对象的getXXX()方法       Object value = getMethod.invoke(p, new Object[] {});       Cell cell = row1.createCell(index++);          cell.setCellValue(value.toString());      }      if (j > avg * count) {       count++;       System.out.print("I");      }      if (count == 20) {       System.out.print("I100%");       count++;      }     }     FileOutputStream fileOut = new FileOutputStream(file);     wb.write(fileOut);     fileOut.close();      } catch (IOException e) {     e.printStackTrace();     return false;    } catch (SecurityException e) {     e.printStackTrace();     return false;    } catch (NoSuchMethodException e) {     e.printStackTrace();     return false;    } catch (IllegalArgumentException e) {     e.printStackTrace();     return false;    } catch (IllegalAccessException e) {     e.printStackTrace();     return false;    } catch (InvocationTargetException e) {     e.printStackTrace();     return false;    }    return true;   }  }      调用方法截取代码：                  Map<String,String> maps = new LinkedHashMap<String,String>();    maps.put("uid", "帐号");    maps.put("cn", "姓名");    maps.put("dept", "部门");    maps.put("mail", "邮箱");        Properties props = System.getProperties();    String USER_HOME = props.getProperty("user.home");    File file = new File(USER_HOME + "/Desktop/excelExport.xlsx");    POIExcelUtil.excelExport(maps, demo,file);