JAVA JDBC连接mysql数据库

1、下载JDBC,下载地址

https://dev.mysql.com/downloads/connector/j/

3、引入包，jdk是1.8 的，选用jdbc 8.0.18 

4、添加源代码，直接选择ZIP包，源代码自动添加，选中Driver，按住ctrl，再点击鼠标左键

5、静态代码块

 6、连接数据库代码

public static void main(String[] args) {
		

		//DriverManager.getConnection("jdbc:mysql://localhost:3306/netsafe&useUnicode=true&characterEncoding=utf-8&allowMultiQueries=true&useSSL=false")
	 Connection connection  = null;
	 Statement statement= null;

	 ResultSet resultSet =  null;
	 //注册驱动
		try {
			//DriverManager.deregisterDriver(new Driver());
			Class.forName("com.mysql.cj.jdbc.Driver");
			connection= 	DriverManager.getConnection("jdbc:mysql://localhost:3306/8888?useUnicode=true&characterEncoding=UTF-8&serverTimezone=UTC", "root", "root");
			
			statement  = connection.createStatement();
 
			 String sqlString = "SELECT * from dept";
			 resultSet = statement.executeQuery(sqlString);	
		 while (resultSet.next()) {
			String deparString = resultSet.getString("DeptNo");
			System.out.println(deparString);
			
		}

			
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		finally {
			 try {
				resultSet.close();
			} catch (SQLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			 try {
				statement.close();
			} catch (SQLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			 try {
				connection.close();
			} catch (SQLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
       System.out.println("测试34");
	}