JDBC连接数据库并将resultset中的文件输出为excel

使用jdbc来连接具体的数据库，下面是具体的代码示例

    private void startJob(String merchantNo, Date date) throws Exception {
        Connection con = null;
        Statement statement = null;
        Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
        String conUrl = "jdbc:sqlserver://188.40.1.189\MSSQLSERVER2;DatabaseName=TransactionBase;user=app;password=sf@tlgd20!7";
        log.info("数据库连接URL: " + conUrl);
        con = DriverManager.getConnection(conUrl);
        statement = con.createStatement();
        String tbName = "Trxrecord_T1-"+df.format(date);
        String sql = "select t.[交易流水号],t.[商户号],m.[商户名称],t.[终端号],"
                + "s.[门店名称],t.[交易时间],t.[清算日期],t.[交易类型],"
                + "t.[交易卡号],t.[卡类别],t.[发卡机构代码],t.[交易初始金额],"
                + "t.[交易金额],t.[商户手续费],t.[交易状态],t.[订单号],"
                + "t.[失败原因],t.[父交易流水号],t.[交易备注]"
                + " from ["+tbName+"] t"
                +" left join Merrecord m on m.[商户号] = t.[商户号]"
                +" left join Subbranch s on s.[商户号] = t.[商户号] and s.[门店编号] = t.[门店号]"
                +" where  t.[交易类型] in ('银联扫码支付','银联扫码撤销','银联扫码退货')"
                +" and m.[父商户号] = '"+merchantNo+"'"
                +" and left(t.[交易时间],10)='"+format.format(date)+"'"
                +" and t.[产品名称] = '网上收银'"
                + " order by t.[交易时间]";
        ResultSet resultSet = statement.executeQuery(sql);
        String path = PropertiesUtil.get("FILE_PATH")+merchantNo+"record"+format.format(date) +".xlsx";
        log.info("数据存放路径为："+path);
        log.info("开始导出为excel");
        createExcel(resultSet,path,format.format(date));
        log.info("导出为excel成功");
        String subject =format.format(date)+ "商户号为"+merchantNo+"的交易明细";
        log.info("开始发送邮件");
        MailSender.send(subject, path);
        log.info("邮件发送成功");
    }

将文件输出为具体的文件夹位置

    private void createExcel(ResultSet resultSet,String path,String date) throws Exception{
        List<Map<String,Object>> list =  downToMap(resultSet);
        ExportExcel<Map<String, Object>> ex = new ExportExcel<Map<String, Object>>();
        String[] headers = { "交易单号", "商户号", "商户名称", "门店名称", "终端号","交易时间", "清算日期", "交易类型","交易账号",
                        "卡类型","所属银行","原始金额","交易金额","手续费","处理状态","订单号","原因","原交易单号","备注"};    
        String[] keys = {"tradeNo","merchantNo","merchantName","subbranchName","terminalNo",
                "tradeTime","settleTime","tradeType","accountNo","accountType",
                "bankCode","amount","tradeAmount","fee","tradeStatus",
                "orderNo","errMsg","fOrderNo","remark"};    
        File file = new File(path);
        OutputStream out = new FileOutputStream(file);
        ex.exportExcel(headers, keys,list, out,"yyyy-MM-dd");
        out.close();
    }

将result中的文件导出为excel

@SuppressWarnings("unchecked")
    public void exportExcel(String title, String[] headers, String[] keys,
            Collection<T> dataset, OutputStream out, String pattern) {
        // 声明一个工作薄
        SXSSFWorkbook workbook = new SXSSFWorkbook();
        // 生成一个表格
        Sheet sheet = workbook.createSheet(title);
        // 设置表格默认列宽度为15个字节
        sheet.setDefaultColumnWidth(20);
        //设置表格默认行高为15
        sheet.setDefaultRowHeightInPoints(16);
        
        // 生成一个样式
        CellStyle style = workbook.createCellStyle();
        // 设置这些样式
        style.setBorderBottom(XSSFCellStyle.BORDER_THIN);
        style.setBorderLeft(XSSFCellStyle.BORDER_THIN);
        style.setBorderRight(XSSFCellStyle.BORDER_THIN);
        style.setBorderTop(XSSFCellStyle.BORDER_THIN);
        style.setAlignment(XSSFCellStyle.ALIGN_CENTER);
        style.setVerticalAlignment(CellStyle.VERTICAL_CENTER);
        // 生成一个字体
        Font font = workbook.createFont();
        font.setFontHeightInPoints((short) 14);
        font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
        font.setColor(HSSFColor.BLUE.index);
        // 把字体应用到当前的样式
        style.setFont(font);
        
        // 生成并设置另一个样式
        CellStyle style2 = workbook.createCellStyle();
        style2.setBorderBottom(XSSFCellStyle.BORDER_THIN);
        style2.setBorderLeft(XSSFCellStyle.BORDER_THIN);
        style2.setBorderRight(XSSFCellStyle.BORDER_THIN);
        style2.setBorderTop(XSSFCellStyle.BORDER_THIN);
        style2.setAlignment(XSSFCellStyle.ALIGN_CENTER);
        style2.setVerticalAlignment(XSSFCellStyle.VERTICAL_CENTER);
        // 生成另一个字体
        Font font2 = workbook.createFont();
        font2.setBoldweight(XSSFFont.BOLDWEIGHT_NORMAL);
        // 把字体应用到当前的样式
        style2.setFont(font2);

        // 声明一个画图的顶级管理器
        Drawing patriarch = sheet.createDrawingPatriarch();
        // 定义注释的大小和位置,详见文档
        Comment comment = patriarch.createCellComment(new XSSFClientAnchor(0,
                0, 0, 0, (short) 4, 2, (short) 6, 5));
        // 设置注释内容
        comment.setString(new XSSFRichTextString("可以在POI中添加注释！"));

        // 产生表格标题行
        Row row = sheet.createRow(0);
        for (short i = 0; i < headers.length; i++) {
            Cell cell = row.createCell(i);
            cell.setCellStyle(style);
            XSSFRichTextString text = new XSSFRichTextString(headers[i]);
            cell.setCellValue(text);
        }

        // 遍历集合数据，产生数据行
        Iterator<T> it = dataset.iterator();
        int index = 0;
        Font font3 = workbook.createFont();
        font3.setColor(HSSFColor.BLACK.index);
        while (it.hasNext()) {
            index++;
            row = sheet.createRow(index);
            Map<String, Object> map = (Map<String, Object>) it.next();
            for (short i = 0; i < keys.length; i++) {

                Cell cell = row.createCell(i);
                cell.setCellStyle(style2);
                try {
                    Object value = map.get(keys[i]);
                    // 判断值的类型后进行强制类型转换
                    String textValue = null;
                    if (value instanceof Date) {
                        Date date = (Date) value;
                        SimpleDateFormat sdf = new SimpleDateFormat(pattern);
                        textValue = sdf.format(date);
                        XSSFRichTextString richString = new XSSFRichTextString(
                                textValue);
                        
                        richString.applyFont(font3);
                        cell.setCellValue(richString);  
                    } else if (value instanceof byte[]) {
                        // 有图片时，设置行高为60px;
                        row.setHeightInPoints(60);
                        // 设置图片所在列宽度为80px,注意这里单位的一个换算
                        sheet.setColumnWidth(i, (short) (35.7 * 80));
                        // sheet.autoSizeColumn(i);
                        byte[] bsValue = (byte[]) value;
                        XSSFClientAnchor anchor = new XSSFClientAnchor(0, 0,
                                1023, 255, (short) 6, index, (short) 6, index);
                        anchor.setAnchorType(2);
                        patriarch.createPicture(anchor, workbook.addPicture(
                                bsValue, HSSFWorkbook.PICTURE_TYPE_JPEG));
                    } else {
                        // 其它数据类型都当作字符串简单处理
                        if (null != value)
                            textValue = value.toString();
                        else
                            textValue = "";
                        // 如果不是图片数据，就利用正则表达式判断textValue是否全部由数字组成
                        if (textValue != null) {
                            Pattern p = Pattern.compile("^\d+(\.\d+)?$");
                            Pattern p1 = Pattern.compile("^\d+\.\d+$");
                            Matcher matcher = p.matcher(textValue);
                            Matcher matcher1 = p1.matcher(textValue);
                            if (matcher.matches()||matcher1.matches()) {
                                // 是数字当作double处理
                                String findValues = matcher.group();
                                if(findValues.length() < 10){
                                    cell.getCellStyle().setFont(font3);
                                    cell.setCellValue(Double.parseDouble(textValue));
                                }else{
                                    short text1 = 0x31;
                                    style2.setDataFormat(text1);
                                    XSSFRichTextString richString = new XSSFRichTextString(
                                            textValue);
                                    
                                    richString.applyFont(font3);
                                    cell.setCellValue(richString);  
                                }    
                            }else{
                                XSSFRichTextString richString = new XSSFRichTextString(
                                        textValue);
                                
                                richString.applyFont(font3);
                                cell.setCellValue(richString);
                            } 
                        }
                    }
                } catch (SecurityException e) {
                    e.printStackTrace();
                } catch (IllegalArgumentException e) {
                    e.printStackTrace();
                } finally {
                    // 清理资源
                }

            }
            // T t = (T) it.next();
            // // 利用反射，根据javabean属性的先后顺序，动态调用getXxx()方法得到属性值
            // Field[] fields = t.getClass().getDeclaredFields();
            // for (short i = 0; i < fields.length; i++)
            // {}
        }
        try {
            
            workbook.write(out);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

关键语句list

List<Map<String,Object>> list =  downToMap(resultSet);

使用downToMap将resultset转换成list

private List<Map<String, Object>> downToMap(ResultSet resultSet) throws Exception {
        List<Map<String,Object >> list = new ArrayList<Map<String, Object>>();
        while(resultSet.next()){
            Map<String,Object> map = new HashMap<String,Object>();
            map.put("tradeNo",resultSet.getString(1));
            map.put("merchantNo",resultSet.getString(2));
            map.put("merchantName",resultSet.getString(3));
            map.put("terminalNo",resultSet.getString(4));
            map.put("subbranchName",resultSet.getString(5));
            map.put("tradeTime",resultSet.getString(6));
            map.put("settleTime",resultSet.getString(7));
            map.put("tradeType",resultSet.getString(8));
            map.put("accountNo",resultSet.getString(9).equals("0")? "":resultSet.getString(9).replaceAll("(\d{6})\d+(\w{4})","$1*****$2"));
            map.put("accountType",resultSet.getString(10));
            map.put("bankCode",resultSet.getString(11));
            map.put("amount",resultSet.getString(12));
            map.put("tradeAmount",resultSet.getString(13));
            map.put("fee",resultSet.getString(14));
            map.put("tradeStatus",resultSet.getString(15));
            map.put("orderNo",resultSet.getString(16));
            map.put("errMsg",resultSet.getString(17));
            map.put("fOrderNo",resultSet.getString(18).equals("0")? "":resultSet.getString(18));
            map.put("remark",resultSet.getString(19));
            list.add(map);
        }
        return list;
    }

  用这个博客来记录下，下次使用起来就很快了。