java - 用 Java 形成邮件正文

Question

目前正在开发一个项目，其中我的 DataRetrival 类将在 java Mail API 主体中设置。

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.util.ArrayList;
import java.util.List;
//import com.mysql.jdbc.Statement;
public class DataRetrival {

    public List<Employee> javaData() {
        DatabaseConnect dc = new DatabaseConnect();
        Connection con;

        List<Employee> employees = new ArrayList<>();
        try {
            con = dc.connect();
            String query ="SELECT * FROM employee";
            Statement st = con.createStatement();
            ResultSet rs = st.executeQuery(query);

               while (rs.next())
                  {

                  Employee emp = new Employee();
                   emp.setID(rs.getInt("ID"));
                   emp.setEmployee_Number(rs.getString("Employee_Number"));
                   emp.setFirstName(rs.getString("FirstName"));
                   emp.setLastName(rs.getString("LastName"));
                   emp.setEmailAddress(rs.getString("EmailAddress"));
                   emp.setPdfName(rs.getString("PdfName"));
                   emp.setEmailAddress(rs.getString("Sup_EmailAddress")); 
                   employees.add(emp);


                   String employeeNumber = rs.getString("Employee_Number");
                   System.out.println(employeeNumber);

                  }

        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return employees;
    }

创建了这样的新实例。

DataRetrival dtr = new DataRetrival();

从这个新实例或任何其他方法中，我想用上述字段填充 InterenetAddress.parse 字段，该字段包含另一个名为 JavaMail 的类代码段中提到的EmailAddress；

message.setRecipients(Message.RecipientType.TO,
                    InternetAddress.parse(Want get called Email_Adress));

Answer 1

来自comment :

i want to call javaData() and get getEmailAddress to another class

调用javaData():

DataRetrival dtr = new DataRetrival();
List<Employee> employees = dtr.javaData();

获取getEmailAddress:

for (Employee employee : employees) {
    String emailAddress = employee.getEmailAddress();
    // use value here
}

上述两个构造都是核心 Java 功能，因此我建议您(重新)阅读 how to do method calls 上的 Java 指南和 how to iterate a list .