昨天写了一篇将Excel中的数据保存到数据库中的文档,今天续写一篇将数据库中的数据导出成Excel文件的

写的不好,也是最基础的,请多多指教

直接贴上代码:

1.还是一样先导入pom文件

<dependency>  
        <groupId>org.apache.poi</groupId>  
        <artifactId>poi-ooxml</artifactId>  
        <version>3.17</version>  
    </dependency>  
    <dependency>  
        <groupId>org.apache.poi</groupId>  
        <artifactId>poi-ooxml-schemas</artifactId>  
        <version>3.17</version>  
    </dependency>  
    <dependency>  
        <groupId>org.apache.poi</groupId>  
        <artifactId>poi</artifactId>  
        <version>3.17</version>  
    </dependency>

2.将数据导出成Excel文件的Util类

/**
     * 将数据导出成Excel文件
     *
     * @param sheetName sheet名称
     * @param title 标题
     * @param values 内容
     * @param wb HSSFWorkbook对象
     * @return
     */
    public static HSSFWorkbook getHSSFWorkbook(String sheetName, String[] title, String[][] values, HSSFWorkbook wb) {

        // 第一步,创建一个HSSFWorkbook,对应一个Excel文件
        if (wb == null) {
            wb = new HSSFWorkbook();
        }

        // 第二步,在workbook中添加一个sheet,对应Excel文件中的sheet
        HSSFSheet sheet = wb.createSheet(sheetName);

        // 第三步,在sheet中添加表头第0行,注意老版本poi对Excel的行数列数有限制
        HSSFRow row = sheet.createRow(0);

        // 第四步,创建单元格,并设置值表头 设置表头居中
        HSSFCellStyle style = wb.createCellStyle();
        style.setAlignment(HorizontalAlignment.CENTER); // 创建一个居中格式
        //设置单元格宽度自适应,在此基础上把宽度调至1.5倍
        for (int i = 0; i < title.length; i++) {
            sheet.autoSizeColumn(i, true);
            sheet.setColumnWidth(i, sheet.getColumnWidth(i) * 15 / 10);
        }
        // 声明列对象
        HSSFCell cell = null;

        // 创建标题
        for (int i = 0; i < title.length; i++) {
            cell = row.createCell(i);
            cell.setCellValue(title[i]);
            cell.setCellStyle(style);
            sheet.autoSizeColumn(i);
            sheet.setColumnWidth(i, sheet.getColumnWidth(i) * 17 / 10);
        }

        // 创建内容
        for (int i = 0; i < values.length; i++) {
            row = sheet.createRow(i + 1);
            for (int j = 0; j < values[i].length; j++) {
                // 将内容按顺序赋给对应的列对象
                row.createCell(j).setCellValue(values[i][j]);
            }
        }
        return wb;
    }

3.控制层

/**
     * 导出数据为Excel文件
     * 下面注释的代码为直接响应到服务器的
     * @param request
     * @param response
     * @return
     */
    @GetMapping("/exportExcel")
    public String exportExcel(HttpServletRequest request, HttpServletResponse response) {
        List<TzJobSet> list = tzJobSetService.list();
        String resultName ="";
        String[] title = {"ID", "标题", "排序", "创建时间"};
//        String filename = "jobSet.xls";
        String sheetName = "职称设置表";
        String[][] content = new String[list.size()][4];
        try {
            for (int i = 0; i < list.size(); i++) {
                content[i][0] = String.valueOf(list.get(i).getId());
                content[i][1] = list.get(i).getTitle();
                content[i][2] = String.valueOf(list.get(i).getSortId());
                content[i][3] = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(list.get(i).getAddTime());
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        HSSFWorkbook wb = ImportExcel.getHSSFWorkbook(sheetName, title, content, null);
        try {
            String ctxPath = "D://upFiles";
            String name = new SimpleDateFormat("ddHHmmss").format(new Date());
            String fileName=name+"jobSet.xlsx";
            String bizPath = "files";
            String nowday = new SimpleDateFormat("yyyyMMdd").format(new Date());
            File file = new File(ctxPath + File.separator + bizPath + File.separator + nowday);
            if (!file.exists()) {
                file.mkdirs();// 创建文件根目录
            }
            String savePath = file.getPath() + File.separator + fileName;
            resultName = bizPath + File.separator + nowday+ File.separator + fileName;
            if (resultName.contains("\\")) {
                resultName = resultName.replace("\\", "/");
            }
            System.out.print(resultName);
            System.out.print(savePath);
            // 响应到客户端需要下面注释的代码
//            this.setResponseHeader(response, filename);
//            OutputStream os = response.getOutputStream(); //响应到服务器
            OutputStream os = new FileOutputStream(savePath); // 保存到当前路径savePath
            wb.write(os);
            os.flush();
            os.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return resultName;
    }

下面的代码是向客户端发送响应流方法(个人喜欢将文件保存返回地址)

/**
     * 向客户端发送响应流方法
     *
     * @param response
     * @param fileName
     */
    public void setResponseHeader(HttpServletResponse response, String fileName) {
        try {
            try {
                fileName = new String(fileName.getBytes(), "UTF-8");
            } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
            }
            response.setContentType("application/vnd.ms-excel");
            response.setHeader("Content-disposition", "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8"));
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }