Poi 生成excel（转载 做了部分修改）

我用的是poi3.6的包！
1.java类 ExportExcel

package com.htjy.excel.common;

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 com.htjy.excel.model.VCxtjHyzjcx;

/**
 * 
 * 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 Integer) {
//
//					 int intValue = (Integer) value;
//
//					 cell.setCellValue(intValue);
//
//					 } else if (value instanceof Float) {
//
//					 float fValue = (Float) value;
//
//					 textValue = new HSSFRichTextString(
//
//					 String.valueOf(fValue));
//
//					 cell.setCellValue(textValue);
//
//					 } else if (value instanceof Double) {
//
//					 double dValue = (Double) value;
//
//					 textValue = new HSSFRichTextString(
//
//					 String.valueOf(dValue));
//
//					 cell.setCellValue(textValue);
//
//					 } else if (value instanceof Long) {
//
//					 long longValue = (Long) value;
//
//					 cell.setCellValue(longValue);
//
//					 }

					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 if (value instanceof Double) {
						
						 double dValue = (Double) value;
	
						 textValue =String.valueOf(dValue);
	
						 cell.setCellValue(textValue);
	
						 }
					else {

						// 其它数据类型都当作字符串简单处理

						textValue = String.valueOf(value);

					}

					// 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();

		}

	}
}

2.model类

引用

package com.htjy.excel.model;

/**
* VCxtjHyzjcxId entity.
*
* @author MyEclipse Persistence Tools
*/

public class VCxtjHyzjcx implements java.io.Serializable {

// Fields

private String khbm;
private String khjc;
private Double dqkyzj;
private Double dqzyzj;
private Double dqfxkzdjzj;
private Double drxjrje;
private Double drxjcje;

// Constructors

/** default constructor */
public VCxtjHyzjcx() {
}

/** minimal constructor */
public VCxtjHyzjcx(String khbm,String khjc,Double dqkyzj,Double dqzyzj,Double dqfxkzdjzj,Double drxjrje,Double drxjcje) {
this.khbm = khbm;
this.khjc = khjc;
this.dqkyzj = dqkyzj;
this.dqzyzj = dqzyzj;
this.dqfxkzdjzj = dqfxkzdjzj;
this.drxjrje = drxjrje;
this.drxjcje = drxjcje;
}

public String getKhbm() {
return khbm;
}

public void setKhbm(String khbm) {
this.khbm = khbm;
}

public String getKhjc() {
return khjc;
}

public void setKhjc(String khjc) {
this.khjc = khjc;
}

public Double getDqkyzj() {
return dqkyzj;
}

public void setDqkyzj(Double dqkyzj) {
this.dqkyzj = dqkyzj;
}

public Double getDqzyzj() {
return dqzyzj;
}

public void setDqzyzj(Double dqzyzj) {
this.dqzyzj = dqzyzj;
}

public Double getDqfxkzdjzj() {
return dqfxkzdjzj;
}

public void setDqfxkzdjzj(Double dqfxkzdjzj) {
this.dqfxkzdjzj = dqfxkzdjzj;
}

public Double getDrxjrje() {
return drxjrje;
}

public void setDrxjrje(Double drxjrje) {
this.drxjrje = drxjrje;
}

public Double getDrxjcje() {
return drxjcje;
}

public void setDrxjcje(Double drxjcje) {
this.drxjcje = drxjcje;
}

}

3.jsp页面调用

<%@page contentType="text/html; charset=GBK"%>
<%@ page import="java.sql.*" %>
<%@ page import="java.util.*"%>
<%@ page import="java.text.*"%>
<%@ page import="com.htjy.cxtj.*,com.htjy.excel.common.*,com.htjy.excel.model.VCxtjHyzjcx"%>
<%@ page import=" java.io.BufferedInputStream,
 java.io.FileInputStream,
 java.io.FileNotFoundException,
 java.io.FileOutputStream,
 java.io.IOException,
 java.io.OutputStream,
 java.lang.reflect.Field,
 java.lang.reflect.InvocationTargetException,
 java.lang.reflect.Method,
 java.text.SimpleDateFormat,
 java.util.ArrayList,
 java.util.Collection,
 java.util.Date,
 java.util.Iterator,
 java.util.List,
 java.util.regex.Matcher,
 java.util.regex.Pattern,
 javax.swing.JOptionPane
		"%>  
<%@ page import="org.apache.poi.hssf.usermodel.HSSFCell,
     org.apache.poi.hssf.usermodel.HSSFCellStyle,
     org.apache.poi.hssf.usermodel.HSSFClientAnchor,
     org.apache.poi.hssf.usermodel.HSSFComment,
     org.apache.poi.hssf.usermodel.HSSFFont,
     org.apache.poi.hssf.usermodel.HSSFPatriarch,
     org.apache.poi.hssf.usermodel.HSSFRichTextString,
     org.apache.poi.hssf.usermodel.HSSFRow,
     org.apache.poi.hssf.usermodel.HSSFSheet,
     org.apache.poi.hssf.usermodel.HSSFWorkbook,
     org.apache.poi.hssf.util.HSSFColor
		 "%> 

<%
	Hyzb_HyzjList list = new Hyzb_HyzjList(request,true);
	ArrayList<ResultSetHashMap> rs = list.getResultSetList();
	
	java.text.SimpleDateFormat formatter = new java.text.SimpleDateFormat("yyyy-MM-dd"); 
	java.util.Date currentTime = new java.util.Date();//得到当前系统时间 
	String str_date1 = formatter.format(currentTime); //将日期时间格式化 
	//excel export
	
	 response.setContentType("octets/stream");
     response.addHeader("Content-Disposition", "attachment;filename=khzjcx("+str_date1+").xls");
		ExportExcel<VCxtjHyzjcx> ex = new ExportExcel<VCxtjHyzjcx>();
		String[] headers = { "客户编码", "客户名称", "可用资金", "占用资金", "风控冻结","当日入金","当日出金" };
		List<VCxtjHyzjcx> dataset = new ArrayList<VCxtjHyzjcx>();
			
			for(int i = 0 ; i < rs.size() ; i++)
			{
				ResultSetHashMap map = (ResultSetHashMap)rs.get(i);
				dataset.add(new VCxtjHyzjcx(map.getString("KHBM"),map.getString("KHJC"),map.getDouble("DQKYZJ"),map.getDouble("DQZYZJ"), map.getDouble("DQFXKZDJZJ"), map.getDouble("DRXJRJE"),map.getDouble("DRXJCJE")));
			}
			
			OutputStream out1 = response.getOutputStream();
		//	OutputStream out1 = new FileOutputStream("E:\\客户资金查询.xls");

        	 ex.exportExcel(headers, dataset, out1);

			out1.close();

%>