JDBC如何利用反射获得连接对象实例化

Class类forName方法

java.lang.Class<T>

public static Class<?> forName(String className) throws ClassNotFoundException

利用Class类提供的方法实例化对象

Class.forName("org.gjt.mm.mysql.Driver");

package org.gjt.mm.mysql;

import java.sql.SQLException;

public class Driver extends com.mysql.jdbc.Driver {
    public Driver() throws SQLException {
    }
}

Driver类继承自com.mysql.jdbc.Driver方法。com.mysql.jdbc.Driver 中静态块，调用DriverManager类静态方法，将实例化Driver类注册到DriverManager中。

package com.mysql.jdbc;

import java.sql.DriverManager;
import java.sql.SQLException;

public class Driver extends NonRegisteringDriver implements java.sql.Driver {
    public Driver() throws SQLException {
    }

    static {
        try {
            DriverManager.registerDriver(new Driver());
        } catch (SQLException var1) {
            throw new RuntimeException("Can't register driver!");
        }
    }
}

DriverManager类中getConnection方法，取得注册在DriverManager类中的驱动对象。

public static Connection getConnection(String url,String user, String password) throws SQLException