Spring Boot Profiles

1.

2.  DemoApplication Class
package com.example.profiles;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ApplicationContext;

@SpringBootApplication
public class DemoApplication {

public static void main(String[] args) {
ApplicationContext ctx= SpringApplication.run(DemoApplication.class, args);
}
}

3.PageController  class
package com.example.profiles;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class PageController {

@Value("${spring.profiles.active}")
private String environment;
@RequestMapping("/")
public String home(){
return environment;
}
}


4.   application.properties
server.port=9009
spring.profiles.active=development

5. application-production.properties
msg=Hello from production properties

6. application-development.properties
msg=Hello from development properties


7 Run program

Browse http://localhost:9009/ 

--------------------------------------
8. Now Modify pageController

package com.example.profiles;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class PageController {

@Value("${spring.profiles.active}")
private String environment;
@Value("${msg}")
private String msg; 
@RequestMapping("/")
public String home(){
return msg;
}
}


9,  Run program

Browse http://localhost:9009/ 


----------------------------------------
8. Change profile from command line

9. Run program

Browse http://localhost:9009/ 

The output will change into production
---------------------------------
10.  Now remove command line arguments from Spring.

11.  Application.yml
environments:
  development:
    url: http://dev.bar.com
    name: Developer site
    production: https://foo.bar.com
    name: My Cool App
    
===========================================
12. DataSource class File
package com.example.profiles;


public class DataSource {
private String server;
private int port;
public DataSource(String server, int port) {
super();
this.server = server;
this.port = port;
}
public String getServer() {
return server;
}
public void setServer(String server) {
this.server = server;
}
public int getPort() {
return port;
}
public void setPort(int port) {
this.port = port;
}
@Override
public String toString() {
return "DataSource Result====> [server=" + server + ", port=" + port + "]";
}


}

13. DataSourceConfig class File
package com.example.profiles;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Profile;

@Configuration
public class DataSourceConfig {

@Profile("development")
@Bean(name="dataSource")
public DataSource development(){
return new DataSource("my-development-url", 9999);
}
@Profile("production")
@Bean(name="dataSource")
public DataSource production(){
return new DataSource("my-production-url", 9999);
}

}

14. package com.example.profiles;

import java.util.Arrays;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ApplicationContext;

@SpringBootApplication
public class DemoApplication {

public static void main(String[] args) {
ApplicationContext ctx= SpringApplication.run(DemoApplication.class, args);
 
String [] names=ctx.getBeanDefinitionNames();
Arrays.sort(names);
 
for(String name:names)
{
System.out.println(name);
}
 
System.out.println( ctx.getBean("dataSource").toString());
}
}


15. Run the program

Now the Result in Console.
DataSource Result====> [server=my-development-url, port=9999]


16  Now Change  in application properties 
server.port=9009

spring.profiles.active=production

17. Run the program

Now the Result in Console.
DataSource Result====> [server=my-production-url, port=9999]

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