Boot Application.java

package com.example.boot_20220228;

import java.time.Duration;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.data.mongodb.repository.config.EnableMongoRepositories;
import org.springframework.session.data.mongo.JdkMongoSessionConverter;
import org.springframework.session.data.mongo.config.annotation.web.http.EnableMongoHttpSession;

@SpringBootApplication

@ComponentScan(basePackages = { 
	"com.example.controller", 
	"com.example.service" })

@EnableMongoRepositories(basePackages = {"com.example.repository"})

@EnableMongoHttpSession(collectionName = "sessions", maxInactiveIntervalInSeconds = 1800)

public class Boot20220228Application {

	public static void main(String[] args) {
		SpringApplication.run(Boot20220228Application.class, args);
	}

	// @Bean => 프로그램이 구동되기 전에 미리 만들어지는 객체.
	// 몽고DB에서 attr을 쉽게 확인하기 위해
	// @Bean
	// public JacksonMongoSessionConverter mongoSessionConverter() {
	// return new JacksonMongoSessionConverter();
	// }

	// attr의 값이 byte[]로 보임
	@Bean
	public JdkMongoSessionConverter mongoSessionConverter() {
		return new JdkMongoSessionConverter(Duration.ofMinutes(30));
	}
}