JAVA POI Excel导出，数据源可以是List<Map>或者List<Model>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<P2pLoanTasklog> ex = new ExportExcel<P2pLoanTasklog>();//这是model类型的数据  写的例子  暂时不添加数据List<P2pLoanTasklog> excelList  = new ArrayList<P2pLoanTasklog>();//生成ExcelHSSFWorkbook 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<T> {    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<T> 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<T> 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