spring注解

Annotate_Stu/src/main/java/com/wsstart/ApplicationConfig.java

+package com.wsstart;
+
+
+import com.alibaba.druid.pool.DruidDataSource;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.ComponentScan;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.PropertySource;
+
+@Configuration
+@ComponentScan("com.wsstart")
+@PropertySource("jdbc.properties")
+public class ApplicationConfig {
+
+    @Value("${jdbc.driver}")
+    private String driverClassName;
+    @Value("${jdbc.url}")
+    private String url;
+    @Value("${jdbc.username}")
+    private String username;
+    @Value("${jdbc.password}")
+    private String password;
+
+
+    @Bean
+    public DruidDataSource getDataSource(){
+        DruidDataSource druidDataSource = new DruidDataSource();
+        druidDataSource.setDriverClassName(driverClassName);
+        druidDataSource.setUsername(username);
+        druidDataSource.setUrl(url);
+        druidDataSource.setPassword(password);
+        return druidDataSource;
+    }
+
+}

Annotate_Stu/src/main/java/com/wsstart/Demo.java

@@ -4,6 +4,8 @@ import com.wsstart.dao.UserDao;
 import com.wsstart.service.UserService;
 import org.springframework.context.support.ClassPathXmlApplicationContext;
 
+import javax.sql.DataSource;
+
 public class Demo {
 
     public static void main(String[] args) {
@@ -16,5 +18,9 @@ public class Demo {
         userService.show();
         System.out.println(userDao);
         userDao.show();
+
+
+        DataSource dataSource = classPathXmlApplicationContext.getBean(DataSource.class);
+        System.out.println(dataSource);
     }
 }

Annotate_Stu/src/main/resources/jdbc.properties

+jdbc.driver=com.mysql.jdbc.Driver
+jdbc.url=jdbc:mysql://localhost:3306/mybatis_db
+jdbc.username=root
+jdbc.password=root
\ No newline at end of file