java使用poi生成导出Excel（新）

导出样式：

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java代码：

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import javax.servlet.http.HttpServletResponse;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFFont;
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.CellRangeAddress;
import org.apache.poi.hssf.util.HSSFColor;
import org.apache.poi.ss.usermodel.IndexedColors;

/**
 * 导出Excel公共方法
 * @version 1.0
 *
 * @author lihao
 *
 */
public class ExportExcel{

    //显示的导出表的标题
    private String title;
    //导出表的列名
    private String[] rowName ;

    private List<Object[]>  dataList = new ArrayList<Object[]>();

    HttpServletResponse  response;

    //构造方法，传入要导出的数据
    public ExportExcel(String title,String[] rowName,List<Object[]>  dataList){
        this.dataList = dataList;
        this.rowName = rowName;
        this.title = title;
    }

    /*
     * 导出数据
     * */
    public void export() throws Exception{
        try{
            HSSFWorkbook workbook = new HSSFWorkbook();                        // 创建工作簿对象
            HSSFSheet sheet = workbook.createSheet(title);                     // 创建工作表

            // 产生表格标题行
            HSSFRow rowm = sheet.createRow(0);
            HSSFCell cellTiltle = rowm.createCell(0);

            rowm.setHeight((short) (25 * 35)); //设置高度

            //sheet样式定义【getColumnTopStyle()/getStyle()均为自定义方法 - 在下面  - 可扩展】
            HSSFCellStyle columnTopStyle = this.getColumnTopStyle(workbook);//获取列头样式对象
            HSSFCellStyle style = this.getStyle(workbook);                    //单元格样式对象

            sheet.addMergedRegion(new CellRangeAddress(0, 0, 0, (rowName.length-1)));
            cellTiltle.setCellStyle(columnTopStyle);
            cellTiltle.setCellValue(title);

            // 定义所需列数
            int columnNum = rowName.length;
            HSSFRow rowRowName = sheet.createRow(1);                // 在索引2的位置创建行(最顶端的行开始的第二行)

            rowRowName.setHeight((short) (25 * 25)); //设置高度

            // 将列头设置到sheet的单元格中
            for(int n=0;n<columnNum;n++){
                HSSFCell  cellRowName = rowRowName.createCell(n);                //创建列头对应个数的单元格
                cellRowName.setCellType(HSSFCell.CELL_TYPE_STRING);                //设置列头单元格的数据类型
                HSSFRichTextString text = new HSSFRichTextString(rowName[n]);
                cellRowName.setCellValue(text);                                    //设置列头单元格的值
                cellRowName.setCellStyle(columnTopStyle);                        //设置列头单元格样式
            }

            //将查询出的数据设置到sheet对应的单元格中
            for(int i=0;i<dataList.size();i++){

                Object[] obj = dataList.get(i);//遍历每个对象
                HSSFRow row = sheet.createRow(i+2);//创建所需的行数

                row.setHeight((short) (25 * 20)); //设置高度

                for(int j=0; j<obj.length; j++){
                    HSSFCell  cell = null;   //设置单元格的数据类型
                    if(j == 0){
                        cell = row.createCell(j,HSSFCell.CELL_TYPE_NUMERIC);
                        cell.setCellValue(i+1);
                    }else{
                        cell = row.createCell(j,HSSFCell.CELL_TYPE_STRING);
                        if(!"".equals(obj[j]) && obj[j] != null){
                            cell.setCellValue(obj[j].toString());                        //设置单元格的值
                        }
                    }
                    cell.setCellStyle(style);                                    //设置单元格样式
                }
            }
            //让列宽随着导出的列长自动适应
            for (int colNum = 0; colNum < columnNum; colNum++) {
                int columnWidth = sheet.getColumnWidth(colNum) / 256;
                for (int rowNum = 0; rowNum < sheet.getLastRowNum(); rowNum++) {
                    HSSFRow currentRow;
                    //当前行未被使用过
                    if (sheet.getRow(rowNum) == null) {
                        currentRow = sheet.createRow(rowNum);
                    } else {
                        currentRow = sheet.getRow(rowNum);
                    }
                    if (currentRow.getCell(colNum) != null) {
                        HSSFCell currentCell = currentRow.getCell(colNum);
                        if (currentCell.getCellType() == HSSFCell.CELL_TYPE_STRING) {
                            int length = currentCell.getStringCellValue().getBytes().length;
                            if (columnWidth < length) {
                                columnWidth = length;
                            }
                        }
                    }
                }
                if(colNum == 0){
                    sheet.setColumnWidth(colNum, (columnWidth-2) * 128);
                }else{
                    sheet.setColumnWidth(colNum, (columnWidth+4) * 256);
                }

            }

            if(workbook !=null){
                try
                {
//                    String fileName = "Excel-" + String.valueOf(System.currentTimeMillis()).substring(4, 13) + ".xls";
//                    String headStr = "attachment; filename=\"" + fileName + "\"";
//                    response = getResponse();
//                    response.setContentType("APPLICATION/OCTET-STREAM");
//                    response.setHeader("Content-Disposition", headStr);
//                    OutputStream out = response.getOutputStream();
//                    workbook.write(out);
                    FileOutputStream out = new FileOutputStream("D:/data/" + new SimpleDateFormat("yyyyMMddHHmmss").format(new Date()).toString() +".xls");
                    workbook.write(out);
                    out.close();
                }
                catch (IOException e)
                {
                    e.printStackTrace();
                }
            }

        }catch(Exception e){
            e.printStackTrace();
        }

    }

    /*
     * 列头单元格样式
     */
      public HSSFCellStyle getColumnTopStyle(HSSFWorkbook workbook) {

            // 设置字体
          HSSFFont font = workbook.createFont();
          //设置字体大小
          font.setFontHeightInPoints((short)11);
          //字体加粗
          font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
          //设置字体名字
          font.setFontName("Courier New");
          //设置样式;
          HSSFCellStyle style = workbook.createCellStyle();
          //设置底边框;
          style.setBorderBottom(HSSFCellStyle.BORDER_THIN);
          //设置底边框颜色;
          style.setBottomBorderColor(HSSFColor.BLACK.index);
          //设置左边框;
          style.setBorderLeft(HSSFCellStyle.BORDER_THIN);
          //设置左边框颜色;
          style.setLeftBorderColor(HSSFColor.BLACK.index);
          //设置右边框;
          style.setBorderRight(HSSFCellStyle.BORDER_THIN);
          //设置右边框颜色;
          style.setRightBorderColor(HSSFColor.BLACK.index);
          //设置顶边框;
          style.setBorderTop(HSSFCellStyle.BORDER_THIN);
          //设置顶边框颜色;
          style.setTopBorderColor(HSSFColor.BLACK.index);
          //在样式用应用设置的字体;
          style.setFont(font);
          //设置自动换行;
          style.setWrapText(false);
          //设置水平对齐的样式为居中对齐;
          style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
          //设置垂直对齐的样式为居中对齐;
          style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);

          //设置单元格背景颜色
          style.setFillForegroundColor(IndexedColors.PALE_BLUE.getIndex());
          style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);

          return style;

      }

      /*
     * 列数据信息单元格样式
     */
      public HSSFCellStyle getStyle(HSSFWorkbook workbook) {
            // 设置字体
            HSSFFont font = workbook.createFont();
            //设置字体大小
            //font.setFontHeightInPoints((short)10);
            //字体加粗
            //font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
            //设置字体名字
            font.setFontName("Courier New");
            //设置样式;
            HSSFCellStyle style = workbook.createCellStyle();
            //设置底边框;
            style.setBorderBottom(HSSFCellStyle.BORDER_THIN);
            //设置底边框颜色;
            style.setBottomBorderColor(HSSFColor.BLACK.index);
            //设置左边框;
            style.setBorderLeft(HSSFCellStyle.BORDER_THIN);
            //设置左边框颜色;
            style.setLeftBorderColor(HSSFColor.BLACK.index);
            //设置右边框;
            style.setBorderRight(HSSFCellStyle.BORDER_THIN);
            //设置右边框颜色;
            style.setRightBorderColor(HSSFColor.BLACK.index);
            //设置顶边框;
            style.setBorderTop(HSSFCellStyle.BORDER_THIN);
            //设置顶边框颜色;
            style.setTopBorderColor(HSSFColor.BLACK.index);
            //在样式用应用设置的字体;
            style.setFont(font);
            //设置自动换行;
            style.setWrapText(false);
            //设置水平对齐的样式为居中对齐;
            style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
            //设置垂直对齐的样式为居中对齐;
            style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);

            return style;
      }
}

测试代码：

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

public class TestExcel {

    public static void main(String[] args) throws Exception {
        List<HashMap<String, Object>> listMap = new ArrayList<>();
        HashMap<String,Object> dataMap = new HashMap<>();

        for(int i=0;i<30;i++){
            dataMap.put("datetime", "2017-12-13 10:43:00");
            dataMap.put("person", "张翠山");
            dataMap.put("type", "文本");
            dataMap.put("content", "工作一定要认真，态度要端正，作风要优良，行事要效率，力争打造一个完美的产品出来。");
            listMap.add(dataMap);
        }

        String title = "张翠山的发言记录";
        String[] rowsName = new String[]{"序号","时间","发言人","类型","消息"};
        List<Object[]>  dataList = new ArrayList<Object[]>();
        Object[] objs = null;
        for (int i = 0; i < listMap.size(); i++) {
            HashMap<String, Object> data = listMap.get(i);
            objs = new Object[rowsName.length];
            objs[0] = i;
            objs[1] = data.get("datetime");
            objs[2] = data.get("person");
            objs[3] = data.get("type");
            objs[4] = data.get("content");
            dataList.add(objs);
        }
        ExportExcel ex = new ExportExcel(title, rowsName, dataList);
        ex.export();
    }

 需要Jar包：（servlet-api.jar在tomcat中lib文件夹下）

poi-3.13.jar

poi-ooxml-3.13.jar

servlet-api.jar

maven依赖：

<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi</artifactId>
    <version>3.13</version>
</dependency>
<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi-ooxml</artifactId>
    <version>3.13</version>
</dependency>