Basic Spring Configuration

Posted On: 2023-03-26 16:09:21 Spring

-----------------------------------1.application.properties -----------------------

driver=MySQLDriver
url=jdbc:mysql

-----------------------------------2.AppConfig.java -----------------------------------

package com.sunil;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.PropertySource;
@ComponentScan(basePackages="com.sunil.bean")
@PropertySource("sunil.properties")
public class AppConfig {
}

-----------------------------------3.DbCon.java------------------------------------------

package com.sunil.bean;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
@Component
public class DbCon {    
    @Value("${url}")
    private String url;
    @Value("${driver}")
    private String driver;
    @Override
    public String toString() {
        return "DbCon [url=" + url + ", driver=" + driver + "]";
    }
}
------------------------------------4.Test .java without AppConfig.class---------------------------------

public class Test {
    public static void main(String[] args) {
        //Creating Spring  Container Reference 
        AnnotationConfigApplicationContext ac=new AnnotationConfigApplicationContext();
        //Scan all the class file in below package
        ac.scan("com.sunil.bean");
        //create object,provide data,link object
        ac.refresh();
        //read the object from spring Container
        Object ob=ac.getBean("dbCon","DbCon.class");
        //print the object
        System.out.println(ob);    
        //Destroy the object in Spring Container
        ac.close();
    }
}

-----------------------------------5.Test1.java with AppConfig.class------------------------------------

public class Test1 {
    public static void main(String[] args) {
        AnnotationConfigApplicationContext ac=new AnnotationConfigApplicationContext(AppConfig.class);
        Object ob=ac.getBean("dbCon","DbCon.class");
        System.out.println(ob);    
        ac.close();
    }
}