JavaWeb项目创建、部署、连接数据库保姆级教程(tomcat)

//mysql80
package database;

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

public class JDBC {
    //驱动类路径
    private static final String DRIVER = "com.mysql.cj.jdbc.Driver";
    //
    private static final String URL="jdbc:mysql://localhost:3306/homework";
    private static final String USER="root";
    private static final String PASSWORD="123456";

    private static Connection conn=null;
    private static Statement stat=null;

    static {
        try {
            //
            Class.forName("com.mysql.cj.jdbc.Driver");
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
    }

    public static Connection getConn(){
        try {
            conn = DriverManager.getConnection(URL,USER,PASSWORD);
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }
        return conn;
    }

    //
    public static Statement getStat() {
        try {
            stat=getConn().createStatement();
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }
        return stat;
    }
    public static void main(String[] args){
        System.out.println(getStat());
    }

}

//mysql57
public class JDBC {
    //驱动类路径
    private static final String DRIVER = "com.mysql.jdbc.Driver";
    //
    private static final String URL="jdbc:mysql://localhost:3306/homework";
    private static final String USER="root";
    private static final String PASSWORD="123456";

    private static Connection conn=null;
    private static Statement stat=null;

    static {
        try {
            //
            Class.forName("com.mysql.jdbc.Driver");
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
    }
//后续不变