springmvc poi实现报表导出

1.pom文件：

　　　　　<dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>3.15</version>
        </dependency>
        <dependency>
            <groupId>org.apache.poi</groupId>
               <artifactId>poi-ooxml</artifactId>
               <version>3.15</version>
        </dependency>

2.controller 根据需要组装数据:

private List<Map<String, Object>> createList(List<User> users){
        if(null == users) {
            return null;
        }
        String[] keys = {"name", "gender", "phoneNo", "email"};
        String[] excelHeader = {"姓名","性别", "手机号", "邮箱"};
        List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();
        Map<String, Object> model = new HashMap<String, Object>();
        model.put("fileName", "用户表" + new Date().getTime());
        model.put("sheetName", "表一");
        model.put("title", "用户表");
        model.put("keys", keys);
        model.put("excelHeader", excelHeader);
        list.add(model);
        
        for(User user : users) {
            Map<String, Object> map = new HashMap<String, Object>();
            map.put("name", user.getName());
            map.put("gender", user.getGender());
            map.put("phoneNo", user.getPhoneNo());
            map.put("email", user.getEmail());
            list.add(map);
        }
        return list;
    }

3.ExcelUtil:

　　

private static final Logger        LOG    = LoggerFactory.getLogger(ExcelUtil.class);

    /**创建一个excel文件*/
    private static Workbook createWorkBoot(String title,
            String[] excelHeader, List<Map<String, Object>> list, String[] keys) {
        Workbook workbook = new HSSFWorkbook();
        //设置sheet的名字
        Sheet sheet = workbook.createSheet(list.get(0).get("sheetName").toString());
        /*设置表格宽度*/
        for(int i = 0; i < keys.length; i++){
            sheet.setColumnWidth(i, 35*150);
        }

        /*font样式设置字体大小,是否加粗*/
        Font titleFont = createFont(workbook, (short)20, true);
        Font headerFont = createFont(workbook, (short)12, true);
        Font bodyFont = createFont(workbook, (short)12, false);
        /*cell通用样式*/
        CellStyle titleStyle = createStyle(workbook, titleFont);
        CellStyle headerStyle = createStyle(workbook, headerFont);
        CellStyle bodyStyle = createStyle(workbook, bodyFont);
        
        // excel中当前行索引
        int index = 0;
        /*合并标题的单元格设置标题信息及样式 */
        sheet.addMergedRegion(new CellRangeAddress(index, index, index,
                excelHeader.length - 1));
        Row titleRow = sheet.createRow(index++);
        Cell titleCell = titleRow.createCell(0);
        titleCell.setCellValue(title);
        titleCell.setCellStyle(titleStyle);
        
        /*设置表格头信息及样式*/
        Row headerRow = sheet.createRow(index++);
        for(int i = 0; i < excelHeader.length; i++) {
            Cell headerCell = headerRow.createCell(i);
            headerCell.setCellValue(excelHeader[i]);
            headerCell.setCellStyle(headerStyle);
        }
        
        /*设置每行每 列的值及样式
         *Row为行,cell为方格
         *创建i*j个方格并设置对应的属性值*/
        for(int i = 1; i < list.size(); i++) {
            Row bodyRow = sheet.createRow(index++);
            for (int j = 0; j < keys.length; j++) {
                Cell bodyCell = bodyRow.createCell(j);
                bodyCell.setCellValue(list.get(i).get(keys[j]) == null ? 
                        " " : list.get(i).get(keys[j]).toString());
                bodyCell.setCellStyle(bodyStyle);
            }
        }
        return workbook;
    }
    
    /**设置字体大小，颜色，样式，是否加粗*/
    private static Font createFont(Workbook workbook,
            short fontHeightInPoints, boolean isBlod) {
        Font font = workbook.createFont();
        //字体大小
        font.setFontHeightInPoints(fontHeightInPoints);
        //字体颜色
        font.setColor(IndexedColors.BLACK.getIndex());
        //字体样式
        font.setFontName("宋体");
        //是否加粗
        font.setBold(isBlod);
        return font;
    }
    
    /**设置字体居中显示，背景色，边框*/
    private static CellStyle createStyle(Workbook workbook, Font font) {
        CellStyle cellStyle = workbook.createCellStyle();
        cellStyle.setFont(font);
        //居中
        cellStyle.setAlignment(HorizontalAlignment.CENTER);
        //背景颜色
        cellStyle.setFillForegroundColor(IndexedColors.WHITE.index);
        cellStyle.setFillBackgroundColor(IndexedColors.WHITE.index);
        cellStyle.setFillPattern(FillPatternType.FINE_DOTS);
        //边框
        cellStyle.setBorderBottom(BorderStyle.THIN);
        cellStyle.setBorderLeft(BorderStyle.THIN);
        cellStyle.setBorderRight(BorderStyle.THIN);
        cellStyle.setBorderTop(BorderStyle.THIN);
        return cellStyle;
    }

    public static boolean exportExcel(HttpServletResponse response,List<Map<String, Object>> list) throws IOException {
        String fileName = list.get(0).get("fileName").toString();
        String[] excelHeader = (String [])list.get(0).get("excelHeader");
        String[] keys = (String [])list.get(0).get("keys");
        String title = list.get(0).get("title").toString();
        
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        try {
            createWorkBoot(title, excelHeader, list, keys).write(baos);
        } catch (IOException e) {
            LOG.error("将workbook中信息写入输出流时失败");
            return false;
        }
        byte[] content = baos.toByteArray();
        InputStream is = new ByteArrayInputStream(content);

        response.reset();
        response.setContentType("application/vnd.ms-excel;charset=utf-8");
        BufferedInputStream bis = null;
        BufferedOutputStream bos = null;
        try {
            response.setHeader("Content-Disposition", "attachment;filename="
                    + new String((fileName + ".xls").getBytes(), "iso-8859-1"));
            ServletOutputStream sos = response.getOutputStream();
            bis = new BufferedInputStream(is);
            bos = new BufferedOutputStream(sos);
            byte[] buff = new byte[2048];
            int byteRead = 0;
            while (-1 != (byteRead = bis.read(buff, 0, buff.length))) {
                bos.write(buff, 0, byteRead);
            }
        } catch (IOException e) {
            LOG.error("创建excel文件时失败");
            return false;
        } finally {
            if (bos != null)
                bos.close();
            if (bis != null)
                bis.close();
            if(is != null)
                is.close();
            if(baos != null)
                baos.close();
        }
        return true;
    }

导出效果