抽取数据库配置 到properties文件 配置代码解耦合

springLearn202503/src/main/java/com/sec/Main.java

@@ -4,29 +4,55 @@ import com.alibaba.druid.pool.DruidDataSource;
 import com.alibaba.druid.pool.DruidPooledConnection;
 import com.mchange.v2.c3p0.ComboPooledDataSource;
 import com.sec.dao.UserDao;
+import org.springframework.context.annotation.AnnotationConfigApplicationContext;
 import org.springframework.context.support.ClassPathXmlApplicationContext;
+import org.springframework.context.support.FileSystemXmlApplicationContext;
 
 import java.beans.PropertyVetoException;
 import java.sql.*;
+import java.util.ResourceBundle;
 
 //TIP To <b>Run</b> code, press <shortcut actionId="Run"/> or
 // click the <icon src="AllIcons.Actions.Execute"/> icon in the gutter.
 public class Main {
-    static String driver = "com.mysql.jdbc.Driver";
-    static String url = "jdbc:mysql://47.103.155.22:3306/learn_spring";
-    static String user = "root";
-    static String password = "mysql_wafeYX";
-    public static void main(String[] args) {
+    static String driver = "";
+    static String url = "";
+    static String user = "";
+    static String password = "";
 
-//        ApplicationContext application=new ClassPathXmlApplicationContext("application.xml");
+    public static void main(String[] args) {
+        Main.getSpring();
+        Main.getSetting();
+        Main.getDruid();
+        Main.getC3p0();
+    }
+
+    //spring api
+    //1.ClassPathXmlApplicationContext   读取根目录下的配置文件
+    //2.FileSystemXmlApplicationContext  读取xml下的配置文件
+    //3.AnnotationConfigApplicationContext   读取注解文件
+    public static  void getSpring(){
+    //     ApplicationContext application=new ClassPathXmlApplicationContext("application.xml");
         ClassPathXmlApplicationContext application=new ClassPathXmlApplicationContext("application.xml");
         UserDao userDao1 = (UserDao)application.getBean("UserDao");
 //      UserDao userDao2 = (UserDao)application.getBean("UserDao");
         System.out.println(userDao1);
         application.close();
 //      System.out.println(userDao2);
-
 //      userDao.getData();
+    }
+
+    //读取properties文件 对数据库连接信息进行设置
+    //目的是为了将配置信息与代码进行解耦
+    public static void getSetting(){
+        ResourceBundle rb = ResourceBundle.getBundle("jdbc");
+        driver=rb.getString("jdbc.driver");
+        url=rb.getString("jdbc.url");
+        user=rb.getString("jdbc.user");
+        password=rb.getString("jdbc.password");
+    }
+
+    public static void getDruid(){
         DruidDataSource druidDataSource=new DruidDataSource();
         druidDataSource.setDriverClassName(driver);
         druidDataSource.setUrl(url);
@@ -39,7 +65,6 @@ public class Main {
             ResultSet resultSet = preparedStatement.executeQuery();
             while (resultSet.next()) {
                 System.out.println(resultSet.getString("user_name")+" "+resultSet.getString("account_name"));
-//                System.out.println(resultSet.getString("account_name"));
             }
             resultSet.close();
             preparedStatement.close();
@@ -47,6 +72,9 @@ public class Main {
         } catch (SQLException e) {
             throw new RuntimeException(e);
         }
+    }
+
+    public static void getC3p0(){
         ComboPooledDataSource comboPooledDataSource=new ComboPooledDataSource();
         try {
             comboPooledDataSource.setDriverClass(driver);
@@ -65,8 +93,5 @@ public class Main {
         } catch (PropertyVetoException | SQLException e) {
             throw new RuntimeException(e);
         }
-
-
-
     }
 }

springLearn202503/src/main/resources/jdbc.properties

@@ -0,0 +1,4 @@
+jdbc.driver=com.mysql.jdbc.Driver
+jdbc.url=jdbc:mysql://47.103.155.22:3306/learn_spring
+jdbc.user=root
+jdbc.password=mysql_wafeYX