初始Spring DI！

package com.apesource.test; import java.io.InputStream; import java.sql.Connection; import java.sql.DriverManager; import java.util.Properties; /** * 演示：解耦过程 * * */ public class Test01 { public static void main(String[] args) throws Exception{ /*************************高耦合******************************/ // DriverManager.registerDriver(new com.mysql.cj.jdbc.Driver()); // Connection root = DriverManager.getConnection("jdbc:mysql://localhost:3306/2404db?serverTimezone=GMT", "root", "123456"); // System.out.println(root); /*************************中耦合******************************/ // Class.forName("com.mysql.cj.jdbc.Driver"); // Connection root = DriverManager.getConnection("jdbc:mysql://localhost:3306/2404db?serverTimezone=GMT", "root", "123456"); // System.out.println(root); /*************************低耦合******************************/ //1.创建工具类 Properties properties = new Properties(); //2.加载文件 InputStream inputStream = Test01.class.getClassLoader().getResourceAsStream("jdbc.properties"); properties.load(inputStream); //3.通过key获取value String driver = properties.getProperty("msg1"); String url = properties.getProperty("msg2"); String name = properties.getProperty("msg3"); String pwd = properties.getProperty("msg4"); //4.获取连接 Class.forName(driver); Connection root = DriverManager.getConnection(url,name,pwd); System.out.println(root); } }