Java基础知识—发送Emai和访问MySQL数据库（七）

package CommClass;

import java.util.Properties;

import javax.mail.Authenticator;
import javax.mail.Message;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;

public class EmailCommClass {
    public static void SendEmail()
    {
        String to="txxxxx@qq.com";
        String from="fxxxx@163.com";
        String host="smtp.163.com";
        Properties properties=System.getProperties();        
        // 设置邮件服务器
        properties.setProperty("mail.smtp.host", host);
        properties.put("mail.smtp.auth", "true");
        
        properties.setProperty("mail.user", "fxxxx@163.com");
        properties.setProperty("mail.password", "fxxxx");
        // 获取默认session对象 
        Session session = Session.getDefaultInstance(properties,new Authenticator()
        {
            public PasswordAuthentication getPasswordAuthentication()
            {
             return new PasswordAuthentication("fxxxx@163.com", "fxxxx"); //发件人邮件用户名、密码
            }
        });
        try{
            MimeMessage message=new MimeMessage(session);
            message.setFrom(new InternetAddress(from));
            message.addRecipient(Message.RecipientType.TO, new InternetAddress(to));
            message.setSubject("This is the Subject Line !");
            message.setText("This is actual message");
            Transport.send(message);
            System.out.println("Sent Message Successfully....");
            
        }
        catch(Exception ex)
        {
            ex.printStackTrace();
        }
    }
}

package CommClass;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;


public class MySQLHelper {
    // JDBC 驱动名及数据库 URL
    static final String JDBC_DRIVER = "com.mysql.jdbc.Driver";  
    static final String DB_URL = "jdbc:mysql://192.168.1.102:3306/ruidb";
    
    // 数据库的用户名与密码，需要根据自己的设置
    static final String USER = "root";
    static final String PASS = "root";
    
    public static void OpeartDB()
    {
        Connection conn=null;
        Statement stmt=null;
        try{
//            Class.forName(JDBC_DRIVER);
            System.out.println("连接数据库...");
            
            conn=DriverManager.getConnection(DB_URL,USER,PASS);
            System.out.println("实例化Statement对....");
            stmt=conn.createStatement();
            String sql="SELECT * from t_student";
            ResultSet rs=stmt.executeQuery(sql);
            while(rs.next())
            {                
                int id=rs.getInt("ID");
                String tname=rs.getString("Name");
                System.out.printf("ID:%d,Num:%s",id,tname);
            }
        }
        catch(Exception ex)
        {
            ex.printStackTrace();
        }
        finally{
            // 关闭资源
            try{
                if(stmt!=null) stmt.close();
            }catch(SQLException se2){
            }// 什么都不做
            try{
                if(conn!=null) conn.close();
            }catch(SQLException se){
                se.printStackTrace();
            }
        }
        
    }
}