java使用poi生成导出Excel（新）

2023-08-25 10:00:22

导出样式：

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>

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