JAVA语言工具类封装-基于poi的excel导出功能

excel导出基本上是必备的功能，如果条目超过65535  是csv，否则xls。

一句话使用：

OrderInfoExcelBuilder.getInstance().createExcel(OrderType.MAIN_ORDER, orderInfoDetailList, response);

结构比较简单，抽象类+子类实现。
先看下抽象类：

package com.qunar.flight.ib2b.trade.center.util.excel;

import java.io.OutputStream;
import java.net.URLEncoder;
import java.util.List;

import javax.mail.internet.MimeUtility;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.lang3.StringUtils;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.xssf.usermodel.XSSFCellStyle;
import org.apache.poi.xssf.usermodel.XSSFDataFormat;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.common.base.Throwables;
import com.qunar.flight.ib2b.trade.center.enums.OrderType;

/**
 * Excel文件导出 定义类
 * 
 * @author xiongxo.chen
 */
public abstract class AbstractExcelBuilder {

    private static final Logger logger = LoggerFactory.getLogger(AbstractExcelBuilder.class);

    public void createExcel(final OrderType type, List datas, HttpServletResponse response) {
        if (0 == datas.size()) {
            return;
        }
        XSSFWorkbook workBook = new XSSFWorkbook();

        OutputStream os;
        try {
            Sheet sheet = createSheet(workBook);
            if (sheet == null)
                return;

            // 写表头
            writeHead(type, sheet, datas);

            // 写内容
            XSSFCellStyle cellStyle = workBook.createCellStyle();
            XSSFDataFormat format = workBook.createDataFormat();
            writeBody(type, cellStyle, format, sheet, datas);
            response.setContentType("application/vnd.ms-excel");
            response.setHeader("Content-disposition", "attachment;filename=OrderDetail.xls");
            os = response.getOutputStream();
            workBook.write(response.getOutputStream());
            os.flush();
        } catch (Throwable t) {
            logger.error("导出 excel出错！", t);
            Throwables.propagate(t);
        }
    }

    /**
     * 写表头
     */
    protected void writeHead(OrderType type, Sheet sheet, List datas) {
        String[] head = getHead(type, datas.get(0));
        Row row = sheet.createRow(0);
        for (int i = 0; i < head.length; i++) {
            row.createCell(i).setCellValue(head[i]);
            sheet.setColumnWidth(i, head[i].getBytes().length * 256);
        }
    }

    /**
     * 写表体
     */
    protected abstract void writeBody(OrderType type, XSSFCellStyle cellStyle, XSSFDataFormat format, Sheet sheet, List datas)
            throws Exception;

    /**
     * 表头内容
     */
    protected abstract String[] getHead(OrderType type, T datas);

    /**
     * Sheet页名称
     */
    protected String getSheetName() {
        return "xo";
    }

    /**
     * 来个Sheet
     */
    private XSSFSheet createSheet(XSSFWorkbook workBook) {
        if (StringUtils.isBlank(getSheetName())) {
            return workBook.createSheet();
        } else {
            return workBook.createSheet(getSheetName());
        }
    }

    /**
     * 设置下载文件中文件的名称
     */
    public static String encodeFilename(String filename) {
        /**
         * 获取客户端浏览器和操作系统信息 在IE浏览器中得到的是：User-Agent=Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; Maxthon; Alexa
         * Toolbar) 在Firefox中得到的是：User-Agent=Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv:1.7.10) Gecko/20050717
         * Firefox/1.0.6
         */
        try {
            // 先检查IE浏览器的
            String newFileName = URLEncoder.encode(filename, "UTF-8");
            newFileName = StringUtils.replace(newFileName, "+", "%20");
            if (newFileName.length() > 150) {
                newFileName = new String(filename.getBytes("GB2312"), "ISO8859-1");
                newFileName = StringUtils.replace(newFileName, " ", "%20");
            }
            if (StringUtils.isBlank(newFileName)) {
                // 若不是IE，则检查Firxbox
                return MimeUtility.encodeText(filename, "UTF-8", "B");
            }
            return filename;
        } catch (Exception ex) {
            return filename;
        }
    }
}
 
  

 
  
子类实现： 将订单信息传入写内容到row叠加就好
 
  
 
  
package com.qunar.flight.ib2b.trade.center.util.excel;

import java.util.List;

import javax.annotation.Resource;

import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.xssf.usermodel.XSSFCellStyle;
import org.apache.poi.xssf.usermodel.XSSFDataFormat;

import com.qunar.flight.ib2b.trade.center.bean.OrderInfoDetail;
import com.qunar.flight.ib2b.trade.center.enums.OrderType;
import com.qunar.flight.ib2b.trade.center.persistence.dao.TOrderStatusChangeLogMapper;

/**
 * 订单信息导出构建器
 * 
 * @author xiongxo.chen
 * 
 */
public class OrderInfoExcelBuilder extends AbstractExcelBuilder {

    private static OrderInfoExcelBuilder builder;

    @Resource
    TOrderStatusChangeLogMapper tOrderStatusChangeLogMapper;

    private OrderInfoExcelBuilder() {
    }

    /**
     * 单例
     */
    public synchronized static OrderInfoExcelBuilder getInstance() {
        if (null == builder)
            builder = new OrderInfoExcelBuilder();
        return builder;
    }

    /**
     * 写Excel内容
     */
    @Override
    protected void writeBody(OrderType type, XSSFCellStyle cellStyle, XSSFDataFormat format, Sheet sheet,
            List datas) throws Exception {
        int columnIndex = 0;
        int rowIndex = 1;
        for (OrderInfoDetail order : datas) {
            columnIndex = 0;
            Row row = sheet.createRow(rowIndex);
            Cell idCell = row.createCell(columnIndex);
            // 文本格式
            cellStyle.setDataFormat(format.getFormat("@"));
            idCell.setCellStyle(cellStyle);
            idCell.setCellValue(order.getId());
            row.createCell(columnIndex++).setCellValue("写内容1");
            row.createCell(columnIndex++).setCellValue("写内容2");
            rowIndex++;
        }
    }

    /**
     * 写Excel表头
     */
    @Override
    protected String[] getHead(OrderType type, OrderInfoDetail order) {
        return new String[] { "订单创建日期", "订单号"};
    }

}