将查询结果的总和作为单独的数据

Question

实体

@Entity
public class DateFMail {

    @Id
    
    private double balance;

    public DateFMail() {
    }

    public DateFMail(double balance) {this.balance = balance;}

    public DateFMail(DateFMail dateFMail) {
    }

    public double getBalance() { return balance;}

    @Override
    public String toString() {
        return "DateFMail{" +
                "balance=" + balance +
                '}';
    }
}

服务

public interface DateFMailService {
    List<DateFMail> findAll();
}

实现

@服务 public class DateFMailServiceImpl 实现 DateFMailService {

@Autowired
private DateFMailRepository mailRepository;

@Override
public List<DateFMail> findAll() {
    return mailRepository.findAll();
}

}

存储库

@存储库 public 接口 DateFMailRepository 扩展 JpaRepository {

@Query(value = "SELECT SUM(balance) \n" +
        "      FROM agents", nativeQuery = true)
List<DateFMail> findAll();

}

邮件家宴

@Service
public class EmailDos {

    @Autowired
    private JavaMailSender mailSender;

     private DateFMailRepository mailRepository;

    String fileDate1 = new SimpleDateFormat("dd.MM.yyyy").format(new Date());

    LocalDate today = LocalDate.now();
    String fileDate = (today.minusDays(1)).format(DateTimeFormatter.ofPattern("dd MMM"));
    String fileDate2 = (today.minusMonths(1)).format(DateTimeFormatter.ofPattern("MMM"));

    public void sendMailSum(String from, String to, String subject, String body, String fileToAttach) throws SQLException {

            List<DateFMail> list = new ArrayList<>(mailRepository.findAll());
            List<DateFMail> list1 = list.stream()
                    .map(DateFMail::new)
                    .collect(Collectors.toList());
       
        System.out.println("sending email...................");
        System.out.println(list1);
        MimeMessagePreparator preparator = new MimeMessagePreparator() {
            public void prepare(MimeMessage mimeMessage) throws Exception {
                mimeMessage.setFrom(new InternetAddress(from));
                mimeMessage.setRecipient(Message.RecipientType.TO, new InternetAddress(to));
                mimeMessage.setSubject(subject);
                mimeMessage.setText(body);

                FileSystemResource file = new FileSystemResource(new File("C:...xlsx"));
                MimeMessageHelper helper = new MimeMessageHelper(mimeMessage, true);
                helper.setFrom("SomeAddress@gmail.com");
                helper.setTo(InternetAddress.parse("SomeAddress@gmail.com"));  
                helper.setText("Good day!\nIn attachment payments for " + fileDate + " с 12.00-00.00" + "\nAmount for " + fileDate1 + list1);

                helper.addAttachment("...xlsx", file);

                mailSender.send(mimeMessage);
                System.out.println("email Fab was successfully sent.....");
            }
        };

        try {
            mailSender.send(preparator);
        } catch (MailException ex) {
            System.err.println(ex.getMessage());
        }
    }
}

控制器

@Component
public class DateFMailController {

    @Autowired
    private DateFMailService mailService;

    public void saveSum() throws IOException {
        saveExcel(mailService.findAll(), "....xlsx");
    }

    private void saveExcel(List<DateFMail> list, String fileName) throws IOException {

        Workbook workbook = new XSSFWorkbook();
        CreationHelper createHelper = workbook.getCreationHelper();

        Sheet sheet = workbook.createSheet("ECards");
        sheet.autoSizeColumn(0);

        Row header = sheet.createRow(0);

        CellStyle headerStyle = workbook.createCellStyle();
        headerStyle.setFillForegroundColor(IndexedColors.LIGHT_BLUE.getIndex());
        headerStyle.setFillPattern(FillPatternType.SOLID_FOREGROUND);

        XSSFFont font = ((XSSFWorkbook) workbook).createFont();
        font.setFontName("Arial");
        font.setFontHeightInPoints((short) 10);
        font.setBold(true);
        headerStyle.setFont(font);

        Cell headerCell = header.createCell(0);
        headerCell.setCellValue("Sum");
        headerCell.setCellStyle(headerStyle);

        CellStyle style = workbook.createCellStyle();
        style.setWrapText(true);

        int ix_row=2;
        for (DateFMail dateFMail : list) {
            Row row = sheet.createRow(ix_row);
            Cell cell = row.createCell(0);
            cell.setCellValue(dateFMail.getBalance());
            cell.setCellStyle(style);

            ix_row++;
        }

        FileOutputStream outputStream = new FileOutputStream(fileName);
        workbook.write(outputStream);
        workbook.close();
    }
}

拯救符文

@Component
public class SaveCardsStartupRunner implements ApplicationRunner {

    @Autowired
    private ECardController eCardController;
    private DateFMailController controller;
  

//    @Autowired
//    private EmailDos emailDos;

    String fileDate1 = new SimpleDateFormat("dd.MM.yyyy").format(new Date());

    LocalDate today = LocalDate.now();
    String fileDate = (today.minusDays(1)).format(DateTimeFormatter.ofPattern("dd MMM"));
    String fileDate2 = (today.minusMonths(1)).format(DateTimeFormatter.ofPattern("MMM"));

    @Override
    public void run(ApplicationArguments args) throws Exception {
        eCardController.saveCards();
        controller.saveSum();
    }
}

我已经更正了我的问题。我已经在此处粘贴了与我的问题相关的所有代码。对于初学者，我想简单地将存储库的查询结果输出到控制台。但是在我刚刚发布在这里的表格中，我得到了一个 NullPointerException 错误，并在代码的一部分中说：controller.saveSum (); -控制器=空。

Answer 1

创建一个 PaymentService class，它应该包含方法 getTotalPayment。在 EmailSend 中注入此 class（提示：请将此 class 名称从 EmailSend 更改为 EmailSender，因为 class 名称应为名词）class。然后在 PaymentService Class 中，您应该与 Data Repository class 交互。从 EmailSend class.

调用此 getTotalPayment 方法

将查询结果的总和作为单独的数据

Take the sum of the query result as separate data

spring

spring-boot

spring-data