ExportExcel

package cn.com.jansh.core.util;

import java.awt.print.Book;
import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Date;
import java.util.Iterator;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import javax.swing.JOptionPane;

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFClientAnchor;
import org.apache.poi.hssf.usermodel.HSSFComment;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.usermodel.HSSFPatriarch;
import org.apache.poi.hssf.usermodel.HSSFRichTextString;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.util.HSSFColor;

import cn.com.jansh.core.entity.sys.IMUserLog;

/**
 * 利用开源组件POI3.0.2动态导出EXCEL文档 转载时请保留以下信息，注明出处！
 * 
 * @author leno
 * @version v1.0
 * @param <T>
 *            应用泛型，代表任意一个符合javabean风格的类
 *            注意这里为了简单起见，boolean型的属性xxx的get器方式为getXxx(),而不是isXxx()
 *            byte[]表jpg格式的图片数据
 */
public class ExportExcel<T>
{
	public void exportExcel(Collection<T> dataset, OutputStream out)
	{
		exportExcel("测试POI导出EXCEL文档", null, dataset, out, "yyyy-MM-dd");
	}

	public void exportExcel(String[] headers, Collection<T> dataset,
			OutputStream out)
	{
		exportExcel("测试POI导出EXCEL文档", headers, dataset, out, "yyyy-MM-dd");
	}

	public void exportExcel(String[] headers, Collection<T> dataset,
			OutputStream out, String pattern)
	{
		exportExcel("测试POI导出EXCEL文档", headers, dataset, out, pattern);
	}

	/**
	 * 这是一个通用的方法，利用了JAVA的反射机制，可以将放置在JAVA集合中并且符号一定条件的数据以EXCEL 的形式输出到指定IO设备上
	 * 
	 * @param title
	 *            表格标题名
	 * @param headers
	 *            表格属性列名数组
	 * @param dataset
	 *            需要显示的数据集合,集合中一定要放置符合javabean风格的类的对象。此方法支持的
	 *            javabean属性的数据类型有基本数据类型及String,Date,byte[](图片数据)
	 * @param out
	 *            与输出设备关联的流对象，可以将EXCEL文档导出到本地文件或者网络中
	 * @param pattern
	 *            如果有时间数据，设定输出格式。默认为"yyy-MM-dd"
	 */
	@SuppressWarnings("unchecked")
	public void exportExcel(String title, String[] headers,
			Collection<T> dataset, OutputStream out, String pattern)
	{
		// 声明一个工作薄
		HSSFWorkbook workbook = new HSSFWorkbook();
		// 生成一个表格
		HSSFSheet sheet = workbook.createSheet(title);
		// 设置表格默认列宽度为15个字节
		sheet.setDefaultColumnWidth((short) 15);
		// 生成一个样式
		HSSFCellStyle style = workbook.createCellStyle();
		// 设置这些样式
/*		style.setFillForegroundColor(HSSFColor.SKY_BLUE.index);
		style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
		style.setBorderBottom(HSSFCellStyle.BORDER_THIN);
		style.setBorderLeft(HSSFCellStyle.BORDER_THIN);
		style.setBorderRight(HSSFCellStyle.BORDER_THIN);
		style.setBorderTop(HSSFCellStyle.BORDER_THIN);
		style.setAlignment(HSSFCellStyle.ALIGN_CENTER);*/
		// 生成一个字体
/*		HSSFFont font = workbook.createFont();
		font.setColor(HSSFColor.VIOLET.index);
		font.setFontHeightInPoints((short) 12);
		font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
		// 把字体应用到当前的样式
		style.setFont(font);*/
		// 生成并设置另一个样式
		HSSFCellStyle style2 = workbook.createCellStyle();
/*		style2.setFillForegroundColor(HSSFColor.LIGHT_YELLOW.index);
		style2.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
		style2.setBorderBottom(HSSFCellStyle.BORDER_THIN);
		style2.setBorderLeft(HSSFCellStyle.BORDER_THIN);
		style2.setBorderRight(HSSFCellStyle.BORDER_THIN);
		style2.setBorderTop(HSSFCellStyle.BORDER_THIN);
		style2.setAlignment(HSSFCellStyle.ALIGN_CENTER);
		style2.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);*/
		// 生成另一个字体
/*		HSSFFont font2 = workbook.createFont();
		font2.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL);
		// 把字体应用到当前的样式
		style2.setFont(font2);*/

		// 声明一个画图的顶级管理器
		HSSFPatriarch patriarch = sheet.createDrawingPatriarch();
		// 定义注释的大小和位置,详见文档
		HSSFComment comment = patriarch.createComment(new HSSFClientAnchor(0,
				0, 0, 0, (short) 4, 2, (short) 6, 5));
		// 设置注释内容
		comment.setString(new HSSFRichTextString("可以在POI中添加注释！"));
		// 设置注释作者，当鼠标移动到单元格上是可以在状态栏中看到该内容.
		comment.setAuthor("leno");

		// 产生表格标题行
		HSSFRow row = sheet.createRow(0);
		for (short i = 0; i < headers.length; i++)
		{
			HSSFCell cell = row.createCell(i);
			cell.setCellStyle(style);
			HSSFRichTextString text = new HSSFRichTextString(headers[i]);
			cell.setCellValue(text);
		}

		// 遍历集合数据，产生数据行
		Iterator<T> it = dataset.iterator();
		int index = 0;
		while (it.hasNext())
		{
			index++;
			row = sheet.createRow(index);
			T t = (T) it.next();
			// 利用反射，根据javabean属性的先后顺序，动态调用getXxx()方法得到属性值
			Field[] fields = t.getClass().getDeclaredFields();
			for (short i = 0; i < fields.length; i++)
			{
				HSSFCell cell = row.createCell(i);
				cell.setCellStyle(style2);
				Field field = fields[i];
				String fieldName = field.getName();
				String getMethodName = "get"
						+ fieldName.substring(0, 1).toUpperCase()
						+ fieldName.substring(1);
				try
				{
					Class tCls = t.getClass();
					Method getMethod = tCls.getMethod(getMethodName,
							new Class[]
							{});
					Object value = getMethod.invoke(t, new Object[]
					{});
					// 判断值的类型后进行强制类型转换
					String textValue = null;
					if (value instanceof Boolean)
					{
						boolean bValue = (Boolean) value;
						textValue = "男";
						if (!bValue)
						{
							textValue = "女";
						}
					}
					else if (value instanceof Date)
					{
						Date date = (Date) value;
						SimpleDateFormat sdf = new SimpleDateFormat(pattern);
						textValue = sdf.format(date);
					}
					else if (value instanceof byte[])
					{
						// 有图片时，设置行高为60px;
						row.setHeightInPoints(60);
						// 设置图片所在列宽度为80px,注意这里单位的一个换算
						sheet.setColumnWidth(i, (short) (35.7 * 80));
						// sheet.autoSizeColumn(i);
						byte[] bsValue = (byte[]) value;
						HSSFClientAnchor anchor = new HSSFClientAnchor(0, 0,
								1023, 255, (short) 6, index, (short) 6, index);
						anchor.setAnchorType(2);
						patriarch.createPicture(anchor, workbook.addPicture(
								bsValue, HSSFWorkbook.PICTURE_TYPE_JPEG));
					}
					else
					{
						// 其它数据类型都当作字符串简单处理
						textValue = value.toString();
					}
					// 如果不是图片数据，就利用正则表达式判断textValue是否全部由数字组成
					if (textValue != null)
					{
						Pattern p = Pattern.compile("^//d+(//.//d+)?$");
						Matcher matcher = p.matcher(textValue);
						if (matcher.matches())
						{
							// 是数字当作double处理
							cell.setCellValue(Double.parseDouble(textValue));
						}
						else
						{
							HSSFRichTextString richString = new HSSFRichTextString(
									textValue);
							HSSFFont font3 = workbook.createFont();
							font3.setColor(HSSFColor.BLUE.index);
							richString.applyFont(font3);
							cell.setCellValue(richString);
						}
					}
				}
				catch (SecurityException e)
				{
					e.printStackTrace();
				}
				catch (NoSuchMethodException e)
				{
					e.printStackTrace();
				}
				catch (IllegalArgumentException e)
				{
					e.printStackTrace();
				}
				catch (IllegalAccessException e)
				{
					e.printStackTrace();
				}
				catch (InvocationTargetException e)
				{
					e.printStackTrace();
				}
				finally
				{
					// 清理资源
				}
			}
		}
		try
		{
			workbook.write(out);
		}
		catch (IOException e)
		{
			e.printStackTrace();
		}
	}

	public static void main(String[] args)
	{
		// 测试学生
		ExportExcel<IMUserLog> ex = new ExportExcel<IMUserLog>();
		String[] headers =
		{ "日志Id", "用户Id", "交易名称", "交易时间", "交易发起方IP地址","状态" };
		List<IMUserLog> dataset = new ArrayList<IMUserLog>();
		dataset.add(new IMUserLog("10000001", "12312", "fdsaf1", "dsfasdfasd", "4565.236.455.41","1"));
		dataset.add(new IMUserLog("10000001", "12312", "fdsaf1", "dsfasdfasd", "4565.236.455.41","1"));
		dataset.add(new IMUserLog("10000001", "12312", "fdsaf1", "dsfasdfasd", "4565.236.455.41","1"));
		dataset.add(new IMUserLog("10000001", "12312", "fdsaf1", "dsfasdfasd", "4565.236.455.41","1"));
		dataset.add(new IMUserLog("10000001", "12312", "fdsaf1", "dsfasdfasd", "4565.236.455.41","1"));
		dataset.add(new IMUserLog("10000001", "12312", "fdsaf1", "dsfasdfasd", "4565.236.455.41","1"));
		// 测试图书
		try
		{
			/*BufferedInputStream bis = new BufferedInputStream(
					new FileInputStream("D://book.bmp"));
			byte[] buf = new byte[bis.available()];
			while ((bis.read(buf)) != -1)
			{
				//
			}*/
			/*dataset2.add(new Book(1, "jsp", "leno", 300.33f, "1234567",
					"清华出版社", buf));
			dataset2.add(new Book(2, "java编程思想", "brucl", 300.33f, "1234567",
					"阳光出版社", buf));
			dataset2.add(new Book(3, "DOM艺术", "lenotang", 300.33f, "1234567",
					"清华出版社", buf));
			dataset2.add(new Book(4, "c++经典", "leno", 400.33f, "1234567",
					"清华出版社", buf));
			dataset2.add(new Book(5, "c#入门", "leno", 300.33f, "1234567",
					"汤春秀出版社", buf));*/

			OutputStream out = new FileOutputStream("E://a.xls");
			ex.exportExcel(headers, dataset, out);
		/*	ex2.exportExcel(headers2, dataset2, out2);*/
			out.close();
			/*out2.close();*/
			JOptionPane.showMessageDialog(null, "导出成功!");
			System.out.println("excel导出成功！");
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
}