首先導入mysql的驅動jar包

1、第一種方法

public class Demo1 {
    //jdbc協議:數據庫子協議://主機:端口號/連接的數據庫
    private String url = "jdbc:mysql://localhost:3306/test";
    private String user = "root";
    private String password = "root";
      
    @Test  
    public void test1(){
        Driver driver = new com.mysql.jdbc.Driver();
        
        Properties props 
 
= new Properties();
        props.setProperty("user", user);
        props.setProperty("password", password);
        
        Connection conn = driver.connect(url, props);
        
        System.out.println(conn);
    }          
}

2、第二種方法

public class Demo2 {
    //jdbc協議:數據庫子協議://主機:端口號/連接的數據庫
    private
 
 String url = "jdbc:mysql://localhost:3306/test";
    private String user = "root";
    private String password = "root";
      
    @Test  
    public void test2(){
        Driver driver = new com.mysql.jdbc.Driver();
        //1、註冊驅動程序（可以註冊多個程序）
        DriverManager.registerDriver(driver);
        
        
 
//2、連接到具體數據庫
        Connection conn = DriverManager.getConnection(url,user,password);
        System.out.println(conn);
    }          
}
//分析Driver類的源碼這樣寫道
static {
  try{
   java.sql.DriverManager.registerDriver(new Driver());
  }catch(SQLException e){
   throw new RuntimeException("Can‘t register driver!");
  }
 }  
//靜態代碼塊在加載類的時候就已經執行了，所以上面的代碼相當於註冊了兩次。改進方法二，得方法3
    

3、第三種方法

public class Demo3{
    //jdbc協議:數據庫子協議://主機:端口號/連接的數據庫
    private String url = "jdbc:mysql://localhost:3306/test";
    private String user = "root";
    private String password = "root";
      
    @Test  
    public void test3() throws Exception{
        Class.forName("com.mysql.jdbc.Driver");
        
        Connection conn = DriverManager.getConnection(url,user,password);
        System.out.println(conn);
    }          
}

JDBC連接MySQL數據庫