MS Lesson5: Spring Configuration

 1. @Value

server.port=9595

amazon.url="https://amazon.com/transfer"

package com.amazon.demoapp.config;

import com.amazon.demoapp.controller.Student;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class BeanConfiguration {

    @Value("${amazon.url}")
    private String url;

    @Bean
    public Student getStudent() {
        System.out.println("Azericard url is: " + url);
        return new Student();
    }

}

2. @ConfigurationProperties

package com.amazon.demoapp.config;

import com.amazon.demoapp.controller.Student;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
@ConfigurationProperties(prefix = "amazon")
public class BeanConfiguration {

    private String url;
    private Integer timeout;

    public String getUrl() {
        return url;
    }

    public void setUrl(String url) {
        this.url = url;
    }

    public Integer getTimeout() {
        return timeout;
    }

    public void setTimeout(Integer timeout) {
        this.timeout = timeout;
    }

    @Bean
    public Student getStudent() {
        System.out.println("Azericard url is: " + url);
        System.out.println("Azericard timeout is: " + timeout);
        return new Student();
    }

}

ve ya

package com.amazon.demoapp.config;

import com.amazon.demoapp.controller.Student;
import lombok.Data;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Data
@Configuration
@ConfigurationProperties(prefix = "amazon")
public class BeanConfiguration {

    private String url;
    private Integer timeout;

    @Bean
    public Student getStudent() {
        System.out.println("Azericard url is: " + url);
        System.out.println("Azericard timeout is: " + timeout);
        return new Student();
    }

}

ve ya

server.port=9595

amazon.url=${AMAZON_URL:https://amazon.com/transfer}
amazon.connection.timeout=${AMAZON_TIMEOUT:10}

package com.amazon.demoapp.config;

import com.amazon.demoapp.controller.Student;
import lombok.Data;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Data
@Configuration
@ConfigurationProperties(prefix = "amazon")
public class BeanConfiguration {

    private String url;
    private Connection connection;

    @Bean
    public Student getStudent() {
        System.out.println("Azericard url is: " + url);
        System.out.println("Azericard timeout is: " + connection.getTimeout());
        return new Student();
    }

    @Data
    public static class Connection {
        private Integer timeout;
    }

}

ve ya

package com.amazon.demoapp.config;

import lombok.Data;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;

@Data
@Component
@ConfigurationProperties(prefix = "amazon")
public class AmazonProperties {

    private String url;
    private Connection connection;

    @Data
    public static class Connection {
        private Integer timeout;
    }
    
}

ve ya

server:
  port: 9595

amazon:
  url: ${AMAZON_URL:https://amazon.com/transfer}
  connection-timeout: ${AMAZON_TIMEOUT:10}

package com.amazon.demoapp.config;

import lombok.Data;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;

@Data
@Component
@ConfigurationProperties(prefix = "amazon")
public class AmazonProperties {

    private String url;
    private Integer connectionTimeout;

}

3. Multiple profiles

spring:
  profiles:
    include: 
      - common
      - amazon

amazon:
  url: ${AMAZON_URL:https://amazon.com/transfer}
  connection-timeout: ${AMAZON_TIMEOUT:10}

server:
  port: 9595

4. @Qualifier annotation

package com.amazon.demoapp.controller;

import com.amazon.demoapp.service.StudentIdGeneratorService;
import lombok.RequiredArgsConstructor;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.web.bind.annotation.RestController;

@RestController
//@RequiredArgsConstructor
public class TestController {

    private StudentIdGeneratorService service;

    public TestController(@Qualifier(value = "randomStudentIdGeneratorService") StudentIdGeneratorService abc) {
        service = abc;
        String strategy = service.getStrategy();
    }

}