使用 JEXCEL API 和 netbeans Maven 从数据库数据生成 Excel 然后将其作为电子邮件附件发送

Question

你好我正在尝试学习 jexcel api 如果我是运行它是通过主 class 它实际工作并生成 excel文件，但是如果我放入 maven 插件，我再也找不到生成的 excel 我没有收到错误，它一直说 excel 已生成，但有 none。如果可能的话，我想询问如何将文件存储在变量或临时目录中然后将其作为电子邮件附件调用的建议？可能吗？因为我真的不需要存储它我只需要调用生成的文件附加到我的电子邮件中

       try{

           //*** for Database Connected ***//
            Connection connect = null;
            Statement s = null;

            Class.forName("com.mysql.jdbc.Driver");
            connect =  DriverManager.getConnection("jdbc:mysql://localhost/mydatabase" +
                    "?user=root&password=root");

            s = connect.createStatement();

            String sql = "SELECT * FROM  customer ORDER BY CustomerID ASC";

            ResultSet rec = s.executeQuery(sql);



            //*** for Excel Report ***//
            String fileName = "C:\java\myExcel.xls";

            WritableWorkbook workbook = Workbook.createWorkbook(new File(fileName));

            //*** Create Font ***//
            WritableFont fontBlue = new WritableFont(WritableFont.TIMES, 10);
            fontBlue.setColour(Colour.BLUE);

            WritableFont fontRed = new WritableFont(WritableFont.TIMES, 10);
            fontRed.setColour(Colour.RED);




            //*** Sheet 1 ***//
            WritableSheet ws1 = workbook.createSheet("mySheet1", 0);


            //*** Header ***//
            WritableCellFormat cellFormat1 = new WritableCellFormat(fontRed);
            //cellFormat2.setBackground(Colour.ORANGE);
            cellFormat1.setAlignment(Alignment.CENTRE);
            cellFormat1.setVerticalAlignment(VerticalAlignment.CENTRE);
            cellFormat1.setBorder(Border.ALL, BorderLineStyle.THIN);


            //*** Data ***//
            WritableCellFormat cellFormat2 = new WritableCellFormat(fontBlue);
           // cellFormat2.setWrap(true);
            cellFormat2.setAlignment(jxl.format.Alignment.CENTRE);
            cellFormat2.setVerticalAlignment(VerticalAlignment.CENTRE);
            cellFormat2.setWrap(true);
            cellFormat2.setBorder(jxl.format.Border.ALL, jxl.format.BorderLineStyle.HAIR,
            jxl.format.Colour.BLACK);

            ws1.mergeCells(0, 0, 5, 0);
            Label lable = new Label(0, 0,"Customer Report", cellFormat1);
            ws1.addCell(lable);

            //*** Header ***//
            ws1.setColumnView(0, 10); // Column CustomerID
            ws1.addCell(new Label(0,1,"CustomerID",cellFormat1));

            ws1.setColumnView(1, 15); // Column Name
            ws1.addCell(new Label(1,1,"Name",cellFormat1));

            ws1.setColumnView(2, 25); // Column Email
            ws1.addCell(new Label(2,1,"Email",cellFormat1));

            ws1.setColumnView(3, 12); // Column CountryCode
            ws1.addCell(new Label(3,1,"CountryCode",cellFormat1));

            ws1.setColumnView(4, 10); // Column Budget
            ws1.addCell(new Label(4,1,"Budget",cellFormat1));

            ws1.setColumnView(5, 10); // Column Used
            ws1.addCell(new Label(5,1,"Used",cellFormat1));

            int iRows = 2;
            while((rec!=null) && (rec.next()))
            {    
                ws1.addCell(new Label(0,iRows,rec.getString("CustomerID"),cellFormat2));
                ws1.addCell(new Label(1,iRows,rec.getString("Name"),cellFormat2));
                ws1.addCell(new Label(2,iRows,rec.getString("Email"),cellFormat2));
                ws1.addCell(new Label(3,iRows,rec.getString("CountryCode"),cellFormat2));
                ws1.addCell(new Label(4,iRows,rec.getString("Budget"),cellFormat2));
                ws1.addCell(new Label(5,iRows,rec.getString("Used"),cellFormat2));
                ++iRows;
            }

            workbook.write();
            workbook.close();

            System.out.println("Excel file created.");

            // Close
            try {
                if(connect != null){
                    s.close();
                    connect.close();
                }
            } catch (SQLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }   

        }
        catch (Exception e) {
            e.printStackTrace();
        }

    }


   }

Answer 1

jexcelapi 2.4.2

javax.mail 1.4.7

您可以使用 ByteArrayOutputStream 将文件附加到您的电子邮件

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Properties;

import javax.activation.DataHandler;
import javax.activation.DataSource;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Multipart;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.AddressException;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;
import javax.mail.util.ByteArrayDataSource;

import jxl.Workbook;
import jxl.format.Alignment;
import jxl.format.Border;
import jxl.format.BorderLineStyle;
import jxl.format.Colour;
import jxl.format.VerticalAlignment;
import jxl.write.Label;
import jxl.write.WritableCellFormat;
import jxl.write.WritableFont;
import jxl.write.WritableSheet;
import jxl.write.WritableWorkbook;

public class Stack {


    public static void main(String[] args) throws IOException {

        try {

            // *** for Database Connected ***//
            Connection connect = null;
            Statement s = null;

            Class.forName("com.mysql.jdbc.Driver");
            connect = DriverManager.getConnection("jdbc:mysql://localhost/mydatabase?user=root&password=root");

            s = connect.createStatement();

            String sql = "SELECT * FROM customer ORDER BY CustomerID ASC";

            ResultSet rec = s.executeQuery(sql);

            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            WritableWorkbook workbook = Workbook.createWorkbook(baos);

            // *** Create Font ***//
            WritableFont fontBlue = new WritableFont(WritableFont.TIMES, 10);
            fontBlue.setColour(Colour.BLUE);

            WritableFont fontRed = new WritableFont(WritableFont.TIMES, 10);
            fontRed.setColour(Colour.RED);

            // *** Sheet 1 ***//
            WritableSheet ws1 = workbook.createSheet("mySheet1", 0);

            // *** Header ***//
            WritableCellFormat cellFormat1 = new WritableCellFormat(fontRed);
            // cellFormat2.setBackground(Colour.ORANGE);
            cellFormat1.setAlignment(Alignment.CENTRE);
            cellFormat1.setVerticalAlignment(VerticalAlignment.CENTRE);
            cellFormat1.setBorder(Border.ALL, BorderLineStyle.THIN);

            // *** Data ***//
            WritableCellFormat cellFormat2 = new WritableCellFormat(fontBlue);
            // cellFormat2.setWrap(true);
            cellFormat2.setAlignment(jxl.format.Alignment.CENTRE);
            cellFormat2.setVerticalAlignment(VerticalAlignment.CENTRE);
            cellFormat2.setWrap(true);
            cellFormat2.setBorder(jxl.format.Border.ALL, jxl.format.BorderLineStyle.HAIR, jxl.format.Colour.BLACK);

            ws1.mergeCells(0, 0, 5, 0);
            Label lable = new Label(0, 0, "Customer Report", cellFormat1);
            ws1.addCell(lable);

            // *** Header ***//
            ws1.setColumnView(0, 10); // Column CustomerID
            ws1.addCell(new Label(0, 1, "CustomerID", cellFormat1));

            ws1.setColumnView(1, 15); // Column Name
            ws1.addCell(new Label(1, 1, "Name", cellFormat1));

            ws1.setColumnView(2, 25); // Column Email
            ws1.addCell(new Label(2, 1, "Email", cellFormat1));

            ws1.setColumnView(3, 12); // Column CountryCode
            ws1.addCell(new Label(3, 1, "CountryCode", cellFormat1));

            ws1.setColumnView(4, 10); // Column Budget
            ws1.addCell(new Label(4, 1, "Budget", cellFormat1));

            ws1.setColumnView(5, 10); // Column Used
            ws1.addCell(new Label(5, 1, "Used", cellFormat1));

            int iRows = 2;
             while((rec!=null) && (rec.next())) {
                ws1.addCell(new Label(0, iRows, rec.getString("CustomerID"), cellFormat2));
                ws1.addCell(new Label(1, iRows, rec.getString("Name"), cellFormat2));
                ws1.addCell(new Label(2, iRows, rec.getString("Email"), cellFormat2));
                ws1.addCell(new Label(3, iRows, rec.getString("CountryCode"), cellFormat2));
                ws1.addCell(new Label(4, iRows, rec.getString("Budget"), cellFormat2));
                ws1.addCell(new Label(5, iRows, rec.getString("Used"), cellFormat2));
                ++iRows;
             }

            workbook.write();
            workbook.close();

            System.out.println("Excel file created.");

            // Close
            try {
                if (connect != null) {
                    s.close();
                    connect.close();
                }
            } catch (SQLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }

            sendMail(baos);

        } catch (Exception e) {
            e.printStackTrace();
        }

    }

    private static void sendMail(ByteArrayOutputStream baos) throws AddressException, MessagingException {

        final String username = "your.mail.id@gmail.com";
        final String password = "your.password";

        Properties props = new Properties();
        props.put("mail.smtp.auth", true);
        props.put("mail.smtp.starttls.enable", true);
        props.put("mail.smtp.host", "smtp.gmail.com");
        props.put("mail.smtp.port", "587");
        props.put("protocol", "smtp");

        Session session = Session.getInstance(props, new javax.mail.Authenticator() {
            protected PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication(username, password);
            }
        });

        Message message = new MimeMessage(session);
        message.setFrom(new InternetAddress("from.mail.id@g_mail.com"));
        message.setRecipients(Message.RecipientType.TO, InternetAddress.parse("to.your.mail@g_mail.com"));
        message.setSubject("Testing Subject");
        message.setText("PFA");

        MimeBodyPart messageBodyPart = new MimeBodyPart();

        Multipart multipart = new MimeMultipart();

        messageBodyPart = new MimeBodyPart();

        String fileName = "attachmentName.xls";
        DataSource aAttachment = new ByteArrayDataSource(baos.toByteArray(), "application/octet-stream");
        messageBodyPart.setDataHandler(new DataHandler(aAttachment));
        messageBodyPart.setFileName(fileName);
        multipart.addBodyPart(messageBodyPart);

        message.setContent(multipart);

        System.out.println("Sending");

        Transport.send(message);

        System.out.println("Done");
    }

}

Sending mail attachment using Java

How to add Attachments to Email in java using outputstream

使用 JEXCEL API 和 netbeans Maven 从数据库数据生成 Excel 然后将其作为电子邮件附件发送

Generate Excel from database data using JEXCEL API and netbeans Maven then send it as attachment to email

java

maven

netbeans

jexcelapi