利用poi将数据写入到excel

以二维数组为例写个小程序，用POI将数据写入到excel中，代码如下：

import org.apache.poi.hssf.usermodel.*;
import org.apache.poi.hssf.util.HSSFColor;

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.text.SimpleDateFormat;
import java.util.Date;

/**
 * Created by youlinmin on 2017/4/8.
 */
public class TransToExcel {
    /**
     * 导出excel文件
     * @param title  表sheet的名字
     * @param headers  表头
     * @param dataList  正文单元格
     * @param out  输出流
     */
    public void exporteExcel(String title,String[] headers,String[][] dataList,OutputStream out){
        HSSFWorkbook workBook = new HSSFWorkbook();
        createSheet(title, headers, dataList, workBook);
        createSheet(title+"2", headers, dataList, workBook);
        try {
            workBook.write(out);
        }catch (IOException e){
            System.out.println("写入文件失败"+e.getMessage());
        }
    }

    /**
     * 创建sheet
     * @param title  sheet的名字
     * @param headers  表头
     * @param dataList  正文单元格
     */
    private void createSheet(String title, String[] headers, String[][] dataList, HSSFWorkbook workBook) {
        HSSFSheet sheet = workBook.createSheet(title);
//        sheet.setDefaultColumnWidth(15);
        //设置表头和普通单元格的格式
        HSSFCellStyle headStyle = setHeaderStyle(workBook);
        HSSFCellStyle bodyStyle = setBodyStyle(workBook);

        createBody(dataList, sheet, bodyStyle);
        createHeader(headers, sheet, headStyle);
    }

    /**
     * 创建正文单元格
     * @param dataList 数据数组
     * @param sheet 表
     * @param bodyStyle 单元格格式
     */
    private void createBody(String[][] dataList, HSSFSheet sheet, HSSFCellStyle bodyStyle) {
        for (int a=0;aindex);
        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_LEFT);

        HSSFFont font2 = workBook.createFont();

        font2.setFontName("微软雅黑");
        font2.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL);
        style2.setFont(font2);
        return style2;
    }

    /**
     * 设置表头格式
     * @param workBook
     * @return
     */
    private HSSFCellStyle setHeaderStyle(HSSFWorkbook workBook) {
        HSSFCellStyle style = workBook.createCellStyle();
        style.setFillForegroundColor(HSSFColor.LIGHT_YELLOW.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_LEFT);

        HSSFFont font = workBook.createFont();

        font.setFontName("微软雅黑");
        font.setFontHeightInPoints((short)12);
        font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
        style.setFont(font);
        return style;
    }

    public static void main(String[] args) {
        TransToExcel transToExcel = new TransToExcel();
        try {
            String path = System.getProperty("user.dir");
            OutputStream os = new FileOutputStream(path+"/学生表测试.xls");
            String[] headers = {"姓名","年龄","学号","博客链接","时间"};
            Date date = new Date(System.currentTimeMillis());
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
            String time = sdf.format(date);
            String[][] list = {{"白滚滚上神","1000000","20100914001000000000","http://baigungun.blog.com.cn/index",time},{"天族夜华","300000","20100914002","http://yehua.com.cn/index",time}};
            transToExcel.exporteExcel("学生表",headers,list,os);
            os.close();

        }catch (FileNotFoundException e){
            System.out.println("无法找到文件");
        }catch (IOException e){
            System.out.println("写入文件失败");
        }
    }
}