JAVA POI Excel导出，数据源可以是List或者List类型

调用方法

//表头
String[] headers = {  "项目ID","贷款名称","借款人ID","用户名","借款人名称/企业名称","信用等级","客服id","客服名称","年利率","借款期限","借款期限类型","申请日期","成标日期","借款状态","最后修改时间","创建日期"};  
//数据键名或者MODEL类字段名
String[] Col = {"tasklogId","loanName","custId","userName","realName","creditGrade","serviceId","serviceName","profitInterest","loanDeadline","loanDeadlineType","createTime","finishTime","status","updateTime","createTime"};

ExportExcel ex = new ExportExcel();
//这是model类型的数据  写的例子  暂时不添加数据
List excelList  = new ArrayList();
//生成Excel
HSSFWorkbook workbook = ex.exportExcel("sheet1", headers,Col, excelList,null);
//下载
response.setContentType("application/vnd.ms-excel");   
response.setHeader("Content-disposition", "attachment;filename=" + exportExcelFileName);   
OutputStream ouputStream = response.getOutputStream();   
workbook.write(ouputStream);   
ouputStream.flush();   
ouputStream.close();  

ExportExcel 导出EXCEL类

package com.hjzx.common.util;

import java.lang.reflect.Method;
import java.text.SimpleDateFormat;
import java.util.Collection;
import java.util.Date;
import java.util.Iterator;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

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.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 org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class ExportExcel {
    private static final Logger logger = LoggerFactory.getLogger(ExportExcel.class);
     /** 
     *  
     * @param title 
     *            表格标题名 
     * @param headers 
     *            表格属性列名数组 （第一行标题）
     * @param Col 
     *            需要显示的表格属性列名数组 如果是javabean 必须和字段名字一直 如果为Map 必须为Map的key名字对应
     * @param dataset 
     *            需要显示的数据集合,集合泛型支持两种，1：符合javabean风格的类的对象 2：Map类型。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 pattern 
     *            如果有时间数据，设定输出格式。默认为"yyy-MM-dd" 
     */  
    public HSSFWorkbook exportExcel(String title, String[] headers,String[] Col,Collection dataset, String pattern) {
        if(pattern == null || pattern.equals("")) pattern = "yyy-MM-dd";
        // 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(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.WHITE.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();
        // 产生表格标题行
        HSSFRow row = sheet.createRow(0);
        int Cell = 0;
        for (short i = 0; i < headers.length; i++) {
            HSSFCell cell = row.createCell(Cell);
            cell.setCellStyle(style);
            HSSFRichTextString text = new HSSFRichTextString(headers[i]);
            cell.setCellValue(text);
            Cell ++ ;
        }
        // 遍历集合数据，产生数据行
        Iterator it = dataset.iterator();
        int index = 0;
        while (it.hasNext()) {
            index++;
            row = sheet.createRow(index);
            T t = (T) it.next();
            String[] fields = Col;
            Cell = 0;
            for (short i = 0; i < fields.length; i++) {
                String fieldName = fields[i];
                HSSFCell cell = row.createCell(Cell);
                cell.setCellStyle(style2);
                try {
                    Object value = "";
                    Class tCls = null;
                    Map map = null;
                    if(t instanceof Map){
                        map = (Map)t;
                        value = map.get(fieldName);
                    } else {
                        String getMethodName = "get"
                                + fieldName.substring(0, 1).toUpperCase()
                                + fieldName.substring(1);
                        tCls = t.getClass();
                        Method getMethod = tCls.getMethod(getMethodName,new Class[] {});
                        value = getMethod.invoke(t, new Object[] {});
                    }
                    if(value == null ) value = "";
                    // 判断值的类型后进行强制类型转换
                    String textValue = null;
                    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(Cell, (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);
                        }
                    }
                    Cell ++ ;
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }
        return workbook;
    }
}

大神有好的建议可以交流一下