java 导出数据到Excel

POI导出,首先加入依赖:

            org.apache.poi
            poi-ooxml
            3.14


         javax.servlet
            javax.servlet-api
            compile
 

ExcelUtil工具类:

package com.example.testword.utils;

import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;
import org.apache.poi.hpsf.SummaryInformation;
import org.apache.poi.hssf.usermodel.*;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.Font;
import org.apache.poi.ss.util.CellRangeAddress;
import org.apache.poi.xssf.streaming.SXSSFCell;
import org.apache.poi.xssf.streaming.SXSSFRow;
import org.apache.poi.xssf.streaming.SXSSFSheet;
import org.apache.poi.xssf.streaming.SXSSFWorkbook;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.math.BigDecimal;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

/**
 * @ProjectName: testWord
 * @Package: com.example.testword.utils
 * @ClassName: ExcelUtil
 * @Description: TODO
 * @Author: A.Hacker
 * @CreateDate: 2019/11/27 16:55
 * @Version: 1.0
 */
public class ExcelUtil {
    public static String DEFAULT_DATE_PATTERN = "yyyy年MM月dd日";//默认日期格式
    public static int DEFAULT_COLOUMN_WIDTH = 10;

    /**
     * 导出Excel 97(.xls)格式 ，少量数据
     *
     * @param title       标题行
     * @param headMap     属性-列名
     * @param jsonArray   数据集
     * @param datePattern 日期格式，null则用默认日期格式
     * @param colWidth    列宽 默认 至少17个字节
     * @param out         输出流
     */
    public static void exportExcel(String title, Map headMap, JSONArray jsonArray, String datePattern, int colWidth, OutputStream out) {
        if (datePattern == null) datePattern = DEFAULT_DATE_PATTERN;
        // 声明一个工作薄
        HSSFWorkbook workbook = new HSSFWorkbook();
        workbook.createInformationProperties();
        workbook.getDocumentSummaryInformation().setCompany("*****公司");
        SummaryInformation si = workbook.getSummaryInformation();
        si.setAuthor("JACK");  //填加xls文件作者信息
        si.setApplicationName("导出程序"); //填加xls文件创建程序信息
        si.setLastAuthor("最后保存者信息"); //填加xls文件最后保存者信息
        si.setComments("JACK is a programmer!"); //填加xls文件作者信息
        si.setTitle("POI导出Excel"); //填加xls文件标题信息
        si.setSubject("POI导出Excel");//填加文件主题信息
        si.setCreateDateTime(new Date());
        //表头样式
        HSSFCellStyle titleStyle = workbook.createCellStyle();
        titleStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);
        HSSFFont titleFont = workbook.createFont();
        titleFont.setFontHeightInPoints((short) 20);
        titleFont.setBoldweight((short) 700);
        titleStyle.setFont(titleFont);
        // 列头样式
        HSSFCellStyle headerStyle = workbook.createCellStyle();
        headerStyle.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
        headerStyle.setBorderBottom(HSSFCellStyle.BORDER_THIN);
        headerStyle.setBorderLeft(HSSFCellStyle.BORDER_THIN);
        headerStyle.setBorderRight(HSSFCellStyle.BORDER_THIN);
        headerStyle.setBorderTop(HSSFCellStyle.BORDER_THIN);
        headerStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);
        HSSFFont headerFont = workbook.createFont();
        headerFont.setFontHeightInPoints((short) 12);
        headerFont.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
        headerStyle.setFont(headerFont);
        // 单元格样式
        HSSFCellStyle cellStyle = workbook.createCellStyle();
        cellStyle.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
        cellStyle.setBorderBottom(HSSFCellStyle.BORDER_THIN);
        cellStyle.setBorderLeft(HSSFCellStyle.BORDER_THIN);
        cellStyle.setBorderRight(HSSFCellStyle.BORDER_THIN);
        cellStyle.setBorderTop(HSSFCellStyle.BORDER_THIN);
        cellStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);
        cellStyle.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
        HSSFFont cellFont = workbook.createFont();
        cellFont.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL);
        cellStyle.setFont(cellFont);
        // 生成一个(带标题)表格
        HSSFSheet sheet = workbook.createSheet();
        // 声明一个画图的顶级管理器
        HSSFPatriarch patriarch = sheet.createDrawingPatriarch();
        // 定义注释的大小和位置,详见文档
        HSSFComment comment = patriarch.createComment(new HSSFClientAnchor(0,
                0, 0, 0, (short) 4, 2, (short) 6, 5));
        // 设置注释内容
        comment.setString(new HSSFRichTextString("可以在POI中添加注释！"));
        // 设置注释作者，当鼠标移动到单元格上是可以在状态栏中看到该内容.
        comment.setAuthor("JACK");
        //设置列宽
        int minBytes = colWidth < DEFAULT_COLOUMN_WIDTH ? DEFAULT_COLOUMN_WIDTH : colWidth;//至少字节数
        int[] arrColWidth = new int[headMap.size()];
        // 产生表格标题行,以及设置列宽
        String[] properties = new String[headMap.size()];
        String[] headers = new String[headMap.size()];
        int ii = 0;
        for (Iterator iter = headMap.keySet().iterator(); iter
                .hasNext(); ) {
            String fieldName = iter.next();

            properties[ii] = fieldName;
            headers[ii] = fieldName;

            int bytes = fieldName.getBytes().length;
            arrColWidth[ii] = bytes < minBytes ? minBytes : bytes;
            sheet.setColumnWidth(ii, arrColWidth[ii] * 256);
            ii++;
        }
        // 遍历集合数据，产生数据行
        int rowIndex = 0;
        for (Object obj : jsonArray) {
            if (rowIndex == 65535 || rowIndex == 0) {
                if (rowIndex != 0) sheet = workbook.createSheet();//如果数据超过了，则在第二页显示

                HSSFRow titleRow = sheet.createRow(0);//表头 rowIndex=0
                titleRow.createCell(0).setCellValue(title);
                titleRow.getCell(0).setCellStyle(titleStyle);
                sheet.addMergedRegion(new CellRangeAddress(0, 0, 0, headMap.size() - 1));

                HSSFRow headerRow = sheet.createRow(1); //列头 rowIndex =1
                for (int i = 0; i < headers.length; i++) {
                    headerRow.createCell(i).setCellValue(headers[i]);
                    headerRow.getCell(i).setCellStyle(headerStyle);

                }
                rowIndex = 2;//数据内容从 rowIndex=2开始
            }
            JSONObject jo = (JSONObject) JSONObject.toJSON(obj);
            HSSFRow dataRow = sheet.createRow(rowIndex);
            for (int i = 0; i < properties.length; i++) {
                HSSFCell newCell = dataRow.createCell(i);

                Object o = jo.get(properties[i]);
                String cellValue = "";
                if (o == null) cellValue = "";
                else if (o instanceof Date) cellValue = new SimpleDateFormat(datePattern).format(o);
                else cellValue = o.toString();

                newCell.setCellValue(cellValue);
                newCell.setCellStyle(cellStyle);
            }
            rowIndex++;
        }
        // 自动调整宽度
        /*for (int i = 0; i < headers.length; i++) {
            sheet.autoSizeColumn(i);
        }*/
        try {
            workbook.write(out);
            workbook.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    //压缩文件
    public static void ZipFiles(java.io.File[] srcfile, java.io.File zipfile) {
        byte[] buf = new byte[1024];
        try {
            ZipOutputStream out2 = new ZipOutputStream(new FileOutputStream(zipfile));
            for (int i = 0; i < srcfile.length; i++) {
                FileInputStream in = new FileInputStream(srcfile[i]);
                out2.putNextEntry(new ZipEntry(srcfile[i].getName()));
                int len;
                while ((len = in.read(buf)) > 0) {
                    out2.write(buf, 0, len);
                }
                out2.closeEntry();
                in.close();
            }
            out2.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    /**
     * 导出Excel 2007 OOXML (.xlsx)格式
     *
     * @param title       标题行
     * @param headMap     属性-列头
     * @param jsonArray   数据集
     * @param datePattern 日期格式，传null值则默认 年月日
     * @param colWidth    列宽 默认 至少17个字节
     * @param out         输出流
     */
    public static void exportExcelX(String title, Map headMap, JSONArray jsonArray, String datePattern, int colWidth, OutputStream out) {
        if (datePattern == null) datePattern = DEFAULT_DATE_PATTERN;
        // 声明一个工作薄
        SXSSFWorkbook workbook = new SXSSFWorkbook(1000);//缓存
        workbook.setCompressTempFiles(true);
        //表头样式
        CellStyle titleStyle = workbook.createCellStyle();
        titleStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);
        Font titleFont = workbook.createFont();
        titleFont.setFontHeightInPoints((short) 20);
        titleFont.setBoldweight((short) 700);
        titleStyle.setFont(titleFont);
        // 列头样式
        CellStyle headerStyle = workbook.createCellStyle();
//        headerStyle.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
//        headerStyle.setBorderBottom(HSSFCellStyle.BORDER_THIN);
//        headerStyle.setBorderLeft(HSSFCellStyle.BORDER_THIN);
//        headerStyle.setBorderRight(HSSFCellStyle.BORDER_THIN);
//        headerStyle.setBorderTop(HSSFCellStyle.BORDER_THIN);
//        headerStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);
        Font headerFont = workbook.createFont();
        headerFont.setFontHeightInPoints((short) 1);
        headerFont.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
        headerStyle.setFont(headerFont);
        // 单元格样式
        /*CellStyle cellStyle = workbook.createCellStyle();
        cellStyle.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
        cellStyle.setBorderBottom(HSSFCellStyle.BORDER_THIN);
        cellStyle.setBorderLeft(HSSFCellStyle.BORDER_THIN);
        cellStyle.setBorderRight(HSSFCellStyle.BORDER_THIN);
        cellStyle.setBorderTop(HSSFCellStyle.BORDER_THIN);
        cellStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);
        cellStyle.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
        Font cellFont = workbook.createFont();
        cellFont.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL);
        cellStyle.setFont(cellFont);*/
        // 生成一个(带标题)表格
        SXSSFSheet sheet = workbook.createSheet();
        //设置列宽
        int minBytes = colWidth < DEFAULT_COLOUMN_WIDTH ? DEFAULT_COLOUMN_WIDTH : colWidth;//至少字节数
        int[] arrColWidth = new int[headMap.size()];
        // 产生表格标题行,以及设置列宽
        String[] properties = new String[headMap.size()];
        String[] headers = new String[headMap.size()];
        int ii = 0;
        for (Iterator iter = headMap.keySet().iterator(); iter
                .hasNext(); ) {
            String fieldName = iter.next();

            properties[ii] = fieldName;
            headers[ii] = headMap.get(fieldName);

            int bytes = fieldName.getBytes().length;
            arrColWidth[ii] = bytes < minBytes ? minBytes : bytes;
            sheet.setColumnWidth(ii, arrColWidth[ii] * 256);
            ii++;
        }
        // 遍历集合数据，产生数据行
        int rowIndex = 0;
        for (Object obj : jsonArray) {
            if (rowIndex == 65535 || rowIndex == 0) {
                if (rowIndex != 0) sheet = workbook.createSheet();//如果数据超过了，则在第二页显示

                SXSSFRow titleRow = sheet.createRow(0);//表头 rowIndex=0
                titleRow.createCell(0).setCellValue(title);
                titleRow.getCell(0).setCellStyle(titleStyle);
                sheet.addMergedRegion(new CellRangeAddress(0, 0, 0, headMap.size() - 1));

                SXSSFRow headerRow = sheet.createRow(1); //列头 rowIndex =1
                for (int i = 0; i < headers.length; i++) {
                    headerRow.createCell(i).setCellValue(headers[i]);
                }
                rowIndex = 2;//数据内容从 rowIndex=2开始
            }
            JSONObject jo = (JSONObject) JSONObject.toJSON(obj);
            SXSSFRow dataRow = sheet.createRow(rowIndex);
            for (int i = 0; i < properties.length; i++) {
                SXSSFCell newCell = dataRow.createCell(i);

                Object o = jo.get(properties[i]);
                String cellValue = "";
                if (o == null) cellValue = "";
                else if (o instanceof Date) cellValue = new SimpleDateFormat(datePattern).format(o);
                else if (o instanceof Float || o instanceof Double)
                    cellValue = new BigDecimal(o.toString()).setScale(2, BigDecimal.ROUND_HALF_UP).toString();
                else cellValue = o.toString();

                newCell.setCellValue(cellValue);
//                newCell.setCellStyle(cellStyle);
            }
            rowIndex++;
        }
        // 自动调整宽度
        /*for (int i = 0; i < headers.length; i++) {
            sheet.autoSizeColumn(i);
        }*/
        try {
            workbook.write(out);
            workbook.close();
            workbook.dispose();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    //Web 导出excel
    public static void downloadExcelFile(String title, Map headMap, JSONArray ja, HttpServletResponse response) {
        try {
            ByteArrayOutputStream os = new ByteArrayOutputStream();
//            ExcelUtil.exportExcelX(title,headMap,ja,null,0,os);
            ExcelUtil.exportExcelXHSSFWorkbook(title, headMap, ja, null, 0, os);
            byte[] content = os.toByteArray();
            InputStream is = new ByteArrayInputStream(content);
            // 设置response参数，可以打开下载页面
            response.reset();
            response.setContentType("application/vnd.ms-excel");
            response.setHeader("Content-Disposition", "attachment;filename=" + new String((title + ".xls").getBytes(), "iso-8859-1"));
            response.setContentLength(content.length);
            response.setCharacterEncoding("UTF-8");

            ServletOutputStream outputStream = response.getOutputStream();
            BufferedInputStream bis = new BufferedInputStream(is);
            BufferedOutputStream bos = new BufferedOutputStream(outputStream);
            byte[] buff = new byte[8192];
            int bytesRead;
            while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {
                bos.write(buff, 0, bytesRead);
            }
            bis.close();
            bos.close();
            outputStream.flush();
            outputStream.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    //正在用的导出的----------------------------------
    public static void exportExcelXHSSFWorkbook(String title, Map headMap, JSONArray jsonArray, String datePattern, int colWidth, OutputStream out) {
        if (datePattern == null) datePattern = DEFAULT_DATE_PATTERN;
        // 声明一个工作薄
        HSSFWorkbook workbook = new HSSFWorkbook();
//        workbook.setCompressTempFiles(true);
        //表头样式
        CellStyle titleStyle = workbook.createCellStyle();
        titleStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);
        Font titleFont = workbook.createFont();
        titleFont.setFontHeightInPoints((short) 18);
        titleFont.setBoldweight((short) 700);
        titleStyle.setFont(titleFont);


        // 列头样式
        CellStyle headerStyle = workbook.createCellStyle();
//        headerStyle.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
//        headerStyle.setBorderBottom(HSSFCellStyle.BORDER_THIN);
//        headerStyle.setBorderLeft(HSSFCellStyle.BORDER_THIN);
//        headerStyle.setBorderRight(HSSFCellStyle.BORDER_THIN);
//        headerStyle.setBorderTop(HSSFCellStyle.BORDER_THIN);
//        headerStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);
        Font headerFont = workbook.createFont();
        headerFont.setFontHeightInPoints((short) 12);
        headerFont.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
        headerStyle.setFont(headerFont);
        // 单元格样式
        CellStyle cellStyle = workbook.createCellStyle();
//        cellStyle.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
//        cellStyle.setBorderBottom(HSSFCellStyle.BORDER_THIN);
//        cellStyle.setBorderLeft(HSSFCellStyle.BORDER_THIN);
//        cellStyle.setBorderRight(HSSFCellStyle.BORDER_THIN);
//        cellStyle.setBorderTop(HSSFCellStyle.BORDER_THIN);
//        cellStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);
//        cellStyle.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
        Font cellFont = workbook.createFont();
        cellFont.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL);

//        cellFont.setFontName("宋体");
        cellFont.setFontHeightInPoints((short) 12);// 设置字体大小

        cellStyle.setFont(cellFont);
        // 生成一个(带标题)表格
        HSSFSheet sheet = workbook.createSheet();

        //设置列宽
        int minBytes = colWidth < DEFAULT_COLOUMN_WIDTH ? DEFAULT_COLOUMN_WIDTH : colWidth;//至少字节数
        int[] arrColWidth = new int[headMap.size()];
        // 产生表格标题行,以及设置列宽
        String[] properties = new String[headMap.size()];
        String[] headers = new String[headMap.size()];
        int ii = 0;
        for (Iterator iter = headMap.keySet().iterator(); iter
                .hasNext(); ) {
            String fieldName = iter.next();

            properties[ii] = fieldName;
            headers[ii] = headMap.get(fieldName);

            int bytes = fieldName.getBytes().length;
            arrColWidth[ii] = bytes < minBytes ? minBytes : bytes;
            sheet.setColumnWidth(ii, arrColWidth[ii] * 256);
            ii++;
        }
        // 遍历集合数据，产生数据行
        int rowIndex = 0;
        for (Object obj : jsonArray) {
            if (rowIndex == 65535 || rowIndex == 0) {
                if (rowIndex != 0) sheet = workbook.createSheet();//如果数据超过了，则在第二页显示

                HSSFRow titleRow = sheet.createRow(0);//表头 rowIndex=0
                titleRow.createCell(0).setCellValue(title);
                titleRow.getCell(0).setCellStyle(titleStyle);
                sheet.addMergedRegion(new CellRangeAddress(0, 0, 0, headMap.size() - 1));

                HSSFRow headerRow = sheet.createRow(1); //列头 rowIndex =1
                for (int i = 0; i < headers.length; i++) {
                    headerRow.createCell(i).setCellValue(headers[i]);
                    headerRow.getCell(i).setCellStyle(headerStyle);

                }
                rowIndex = 2;//数据内容从 rowIndex=2开始
            }
            JSONObject jo = (JSONObject) JSONObject.toJSON(obj);
            HSSFRow dataRow = sheet.createRow(rowIndex);
            for (int i = 0; i < properties.length; i++) {
                HSSFCell newCell = dataRow.createCell(i);

                Object o = jo.get(properties[i]);
                String cellValue = "";
                if (o == null) cellValue = "";
                else if (o instanceof Date) cellValue = new SimpleDateFormat(datePattern).format(o);
                else if (o instanceof Float || o instanceof Double)
                    cellValue = new BigDecimal(o.toString()).setScale(2, BigDecimal.ROUND_HALF_UP).toString();
                else cellValue = o.toString();

                newCell.setCellValue(cellValue);
                newCell.setCellStyle(cellStyle);
            }
            rowIndex++;
        }
        // 自动调整宽度
        /*for (int i = 0; i < headers.length; i++) {
            sheet.autoSizeColumn(i);
        }*/
        try {
            workbook.write(out);
            workbook.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }


    /**
     * 导入方法
     */
    private static final Logger logger = LoggerFactory.getLogger(ExcelUtil.class);
    //成功
    public static final Integer STATUS_OK = Integer.valueOf(1);
    //失败
    public static final Integer STATUS_NO = Integer.valueOf(0);

    //私有化构造器
    private ExcelUtil() {

    }

    /**
     * 获取excel文件中的数据对象
     *
     * @param is               excel
     * @param excelColumnNames excel中每个字段的英文名(应该与pojo对象的字段名一致,顺序与excel一致)
     * @return excel每行是list一条记录，map是对应的"字段名-->值"
     * @throws Exception
     */
   /* public static List> getImportData(InputStream is, List excelColumnNames) throws Exception {
        logger.debug("InputStream:{}", is);
        if (is == null) {
            return Collections.emptyList();
        }
        Workbook workbook = null;
        try {
            //拿到excel
            workbook = Workbook.getWorkbook(is);
        } catch (BiffException e) {
            logger.error(e.getMessage(), e);
            return Collections.EMPTY_LIST;
        } catch (IOException e) {
            logger.error(e.getMessage(), e);
            return Collections.EMPTY_LIST;
        }
        logger.debug("workbook:{}", workbook);

        if (workbook == null) {
            return Collections.emptyList();
        }
      //第一个sheet
        Sheet sheet = workbook.getSheet(0);
        //行数
        int rowCounts = sheet.getRows() - 1;
        logger.debug("rowCounts:{}", rowCounts);
        List> list = new ArrayList>(rowCounts - 1);

        //双重for循环取出数据
        for(int i = 1; i < rowCounts; i++){
            Map params = new HashMap();
            //i,j i:行 j:列
            for(int j = 0; j < excelColumnNames.size(); j++){
                Cell cell = sheet.getCell(j, i);
                params.put(excelColumnNames.get(j), cell.getContents());
            }

            list.add(params);
        }

        return list;
    }*/
    public static void main(String[] args) throws IOException {
        int count = 5000;
        JSONArray ja = new JSONArray();
        for (int i = 0; i < 5000; i++) {
            Student s = new Student();
            s.setName("POI" + i);
            s.setAge(i);
            s.setBirthday(new Date());
            s.setSex(i / 2 == 0 ? false : true);
            ja.add(s);
        }
        Map headMap = new LinkedHashMap();
        headMap.put("name", "姓名");
        headMap.put("age", "年龄");
        headMap.put("birthday", "生日");
        headMap.put("sex", "性别");

        String title = "测试";
        OutputStream outXlsx = new FileOutputStream("F://b.xlsx");
        System.out.println("正在导出xlsx....");
        Date d2 = new Date();
        ExcelUtil.exportExcelX(title, headMap, ja, null, 0, outXlsx);
        System.out.println("共" + count + "条数据,执行" + (new Date().getTime() - d2.getTime()) + "ms");
        outXlsx.close();

    }
}

class Student {
    private String name;
    private int age;
    private Date birthday;
    private boolean sex;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getAge() {
        return age;
    }

    public Date getBirthday() {
        return birthday;
    }

    public void setBirthday(Date birthday) {
        this.birthday = birthday;
    }

    public boolean isSex() {
        return sex;
    }

    public void setSex(boolean sex) {
        this.sex = sex;
    }

    public void setAge(Integer age) {
        this.age = age;
    }
}