工具类：ExcelUtil

package com.yltd.cnyun.common.utils;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.nio.charset.Charset;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import org.apache.commons.beanutils.PropertyUtils;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.util.HSSFColor;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;
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.ss.util.WorkbookUtil;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

// import com.csvreader.CsvReader;

/**
 * @author 
 * @Description:TODO操作Excel工具类
 * @date 2018年8月8日
 * @since 2018年8月8日
 */
public class ExcelUtil {

	private static DateFormat dateformate = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

	/**
	 * 输入excel文件 titleMp 对应结果集的字段名称为Key ,显示在Excel标题的内容为值.例：name-->姓名
	 *
	 * @param titleMp
	 * @param recordLt
	 *            输出的结果集
	 * @param path
	 *            输出路径
	 * @throws Exception
	 */
	public static void createFile(Map titleMp, List recordLt, String path) throws Exception {

		Workbook wb = new XSSFWorkbook();
		CreationHelper createHelper = wb.getCreationHelper();
		String safeName = WorkbookUtil.createSafeSheetName("sheet1");
		// 创建sheet
		Sheet sheet1 = wb.createSheet(safeName);

		// 设置标题单元格样式
		CellStyle titlestyle = wb.createCellStyle();
		titlestyle.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
		titlestyle.setFillForegroundColor(HSSFColor.YELLOW.index);
		titlestyle.setBorderBottom(CellStyle.BORDER_THIN);
		titlestyle.setBorderTop(CellStyle.BORDER_THIN);
		titlestyle.setBorderLeft(CellStyle.BORDER_THIN);
		titlestyle.setBorderRight(CellStyle.BORDER_THIN);
		titlestyle.setAlignment(CellStyle.ALIGN_CENTER);

		// 生成行对象
		Row row = sheet1.createRow((short) 0);
		// 生成标题
		Iterator iter = titleMp.entrySet().iterator();
		int cellNum = 0;

		List cellNameLt = new ArrayList();

		while (iter.hasNext()) {
			Map.Entry entry = (Map.Entry) iter.next();
			Object val = entry.getValue();
			Cell cell = row.createCell(cellNum);
			cell.setCellValue(createHelper.createRichTextString(val.toString()));
			cell.setCellStyle(titlestyle);
			++cellNum;
			cellNameLt.add(entry.getKey().toString());
		}

		CellStyle style = wb.createCellStyle();
		style.setBorderBottom(CellStyle.BORDER_THIN);
		style.setBorderTop(CellStyle.BORDER_THIN);
		style.setBorderLeft(CellStyle.BORDER_THIN);
		style.setBorderRight(CellStyle.BORDER_THIN);
		int rowNum = 1;
		// 生成行列表
		for (int k = 0; k < recordLt.size(); k++) {
			// 创建行
			row = sheet1.createRow((short) rowNum);
			int cellNo = 0;
			for (int i = 0; i < cellNameLt.size(); i++) {
				Cell cell = row.createCell(cellNo);
				// 获取对应的列的值
				Object value = PropertyUtils.getProperty(recordLt.get(k), cellNameLt.get(i));
				String data = formateExcelData(value);
				cell.setCellValue(createHelper.createRichTextString(data));
				cell.setCellStyle(style);

				++cellNo;
			}
			++rowNum;
		}
		// 文件输出
		FileOutputStream fileOut = new FileOutputStream(path);
		wb.write(fileOut);
		fileOut.close();

	}

	/**
	 * 格式化excel导出数据
	 *
	 * @param value
	 */
	private static String formateExcelData(Object value) {
		if (null == value) {
			return null;
		} else {
			if (value instanceof Date) {
				value = dateformate.format(value);
			}
			if (value instanceof Double) {
				value = Double.parseDouble(value.toString());
			}
			return value.toString();
		}
	}

	/**
	 * 读csv格式
	 *
	 * @param dir
	 *            文件路径 .csv
	 * @return
	 *//*
	public static List readCsvFile(String dir) {
		File file = new File(dir);
		CsvReader reader = null;
		List csvList = new ArrayList(); // 用来保存数据
		try {

			reader = new CsvReader(file.getAbsolutePath(), ',', Charset.forName("SJIS"));
			// 一般用这编码读就可以了
			reader.readHeaders();
			while (reader.readRecord()) { // 逐行读入除表头的数据
				csvList.add(reader.getValues());
			}
			reader.close();
			return csvList;
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			if (reader != null) {
				reader.close();
			}
		}
		return null;
	}

	*//**
	 * 解析某个目录下个所有csv
	 *
	 * @param dir
	 *            文件路径 .csv
	 * @return
	 *//*
	public static List> readDirCsvFile(String dir) {
		File fileCount = new File(dir);
		File[] list = fileCount.listFiles();
		CsvReader reader = null;
		List> listStrs = new ArrayList>();
		try {
			for (int i = 0; i < list.length; i++) {
				File file = list[i];
				List csvList = new ArrayList(); // 用来保存数据
				reader = new CsvReader(file.getAbsolutePath(), ',', Charset.forName("SJIS"));
				// 一般用这编码读就可以了
				reader.readHeaders();
				while (reader.readRecord()) { // 逐行读入除表头的数据
					csvList.add(reader.getValues());
				}

				listStrs.add(csvList);
			}
			return listStrs;
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			if (reader != null) {
				reader.close();
			}
		}
		return null;

	}*/
}