Spring WebFlux - 몽고 DB 연동하기 :: 개발 흔적 남기기

Spring WebFlux - 몽고 DB 연동하기

WebFlux에서 몽고 DB 연동하는 법을 알아 보겠습니다.

Webflux에서 몽고 DB 연동하기

1. 프로젝트 생성하기

디펜던시도 선택해줍니다.

Lombok, 반응형 스프링용으로 나온 Reactive Mongo, Reactive Web까지 선택하였습니다.

그리고 Finish를 해줍니다.

2. 뷰 설정

뷰 페이지에서 사용할 thymeleaf가 빠졌네요. 추가된 pom.xml 입니다.

<dependencies>
	<dependency>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-data-mongodb-reactive</artifactId>
	</dependency>
	
	<dependency>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-thymeleaf</artifactId>
	</dependency>
	
	<dependency>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-webflux</artifactId>
	</dependency>

	<dependency>
		<groupId>org.projectlombok</groupId>
		<artifactId>lombok</artifactId>
		<optional>true</optional>
	</dependency>
	<dependency>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-test</artifactId>
		<scope>test</scope>
		<exclusions>
			<exclusion>
				<groupId>org.junit.vintage</groupId>
				<artifactId>junit-vintage-engine</artifactId>
			</exclusion>
		</exclusions>
	</dependency>
	<dependency>
		<groupId>io.projectreactor</groupId>
		<artifactId>reactor-test</artifactId>
		<scope>test</scope>
	</dependency>
</dependencies>

WebConfig.java

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.reactive.config.EnableWebFlux;
import org.springframework.web.reactive.config.ViewResolverRegistry;
import org.springframework.web.reactive.config.WebFluxConfigurer;
import org.thymeleaf.spring5.ISpringWebFluxTemplateEngine;
import org.thymeleaf.spring5.SpringWebFluxTemplateEngine;
import org.thymeleaf.spring5.templateresolver.SpringResourceTemplateResolver;
import org.thymeleaf.spring5.view.reactive.ThymeleafReactiveViewResolver;
import org.thymeleaf.templatemode.TemplateMode;
import org.thymeleaf.templateresolver.ITemplateResolver;

@EnableWebFlux
@Configuration
public class WebConfig implements ApplicationContextAware, WebFluxConfigurer {
	
	ApplicationContext context;

	@Override
	public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
		this.context = context;
	}
	
	@Bean
	public ITemplateResolver thymeleafTemplateResolver() {
	    final SpringResourceTemplateResolver resolver = new SpringResourceTemplateResolver();
	    resolver.setApplicationContext(this.context);
	    resolver.setPrefix("classpath:templates/");
	    resolver.setSuffix(".html");
	    resolver.setTemplateMode(TemplateMode.HTML);
	    resolver.setCacheable(false);
	    resolver.setCheckExistence(false);
	    return resolver;
	}
	
	@Bean
	public ISpringWebFluxTemplateEngine thymeleafTemplateEngine() {
	    SpringWebFluxTemplateEngine templateEngine = new SpringWebFluxTemplateEngine();
	    templateEngine.setTemplateResolver(thymeleafTemplateResolver());
	    return templateEngine;
	}
	
	@Bean
	public ThymeleafReactiveViewResolver thymeleafReactiveViewResolver() {
	    ThymeleafReactiveViewResolver viewResolver = new ThymeleafReactiveViewResolver();
	    viewResolver.setTemplateEngine(thymeleafTemplateEngine());
	    return viewResolver;
	}
	
	@Override
	public void configureViewResolvers(ViewResolverRegistry registry) {
	    registry.viewResolver(thymeleafReactiveViewResolver());
	}
}

view 설정을 해줍니다.

resources/templates 하위에 있는 html파일을 읽도록 처리할 예정입니다.

3. document 설정

Lombok을 활용한 document를 설정합니다.

JPA로 만들기 때문에 매핑할 Movie 클래스를 정의하였습니다.

import org.springframework.data.annotation.Id;
import org.springframework.data.mongodb.core.mapping.Document;

import lombok.Getter;
import lombok.Setter;
import lombok.ToString;

@Getter
@Setter
@ToString
@Document(collection="list")
public class Movie {
	@Id
	private String id;
	private String title;
	private String director;
	private String since;
	private int audienceCnt;
	
	public Movie(String title, String director, String since, int audienceCnt) {
		super();
		this.title = title;
		this.director = director;
		this.since = since;
		this.audienceCnt = audienceCnt;
	}
}

몽고 DB 데이터는 아래와 같습니다.

4. repository 생성하기

MovieRepository.java

import org.springframework.data.mongodb.repository.ReactiveMongoRepository;
import org.springframework.stereotype.Repository;

import com.psw.movie.document.Movie;

@Repository
public interface MovieRepository extends ReactiveMongoRepository<Movie, String>{
}

ReactiveMongoRepository를 상속받아 구현합니다.

5. 서비스 생성

import org.springframework.context.ApplicationEventPublisher;
import org.springframework.stereotype.Service;

import com.psw.movie.document.Movie;
import com.psw.movie.repository.MovieRepository;

import reactor.core.publisher.Flux;

@Service
public class MovieService {

	private final ApplicationEventPublisher publisher;
	private final MovieRepository movieRepository;
	
	public MovieService(ApplicationEventPublisher publisher, MovieRepository movieRepository) {
		this.publisher = publisher;
		this.movieRepository = movieRepository;
	}
	
	public Flux<Movie> allMovies(){
		return movieRepository.findAll();
	}
}

생성한 repository에서 데이터를 가공하거나 변경할 서비스를 생성합니다.

해당 포스팅에서는 다른 기능없이 전체를 가져오는 findAll()메소드를 통해 전부 가져올 예정입니다.

6. handler 작성

import org.springframework.http.MediaType;
import org.springframework.stereotype.Component;
import org.springframework.web.reactive.function.server.ServerRequest;
import org.springframework.web.reactive.function.server.ServerResponse;

import com.psw.movie.document.Movie;
import com.psw.movie.service.MovieService;

import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;

@Component
public class MovieHandler {
	
	private final MovieService movieService;
	
	public MovieHandler(MovieService service) {
		this.movieService = service;
	}
	
	final static MediaType TEXT_HTML = MediaType.TEXT_HTML;
	final static MediaType APPLICATION_JSON = MediaType.APPLICATION_JSON;
	
	//movie.html로 변환
	public Mono<ServerResponse> movie(ServerRequest request){
		return ServerResponse.ok().contentType(TEXT_HTML).render("movie");
	}
	
	//요청이오면 JSON형태로 데이터 파싱
	public Mono<ServerResponse> getMovieList(ServerRequest request){
		Flux<Movie> list = this.movieService.allMovies();
		return ServerResponse.ok().contentType(APPLICATION_JSON).body(list, Movie.class);
	}
}

서비스를 사용하여 모든 영화리스트를 가져오는 핸들러를 작성합니다.

7. 핸들러를 연결할 라우터를 작성합니다.

요청에 따라 파싱해줄 라우터입니다.

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.MediaType;
import org.springframework.web.reactive.function.server.RequestPredicates;
import org.springframework.web.reactive.function.server.RouterFunction;
import org.springframework.web.reactive.function.server.RouterFunctions;
import org.springframework.web.reactive.function.server.ServerResponse;

import com.psw.movie.handler.MovieHandler;

@Configuration
public class MovieRouter {
	
	final static MediaType TEXT_HTML = MediaType.TEXT_HTML;
	final static MediaType APPLICATION_JSON = MediaType.APPLICATION_JSON;
	
	@Bean
	public RouterFunction<ServerResponse> index(MovieHandler movieHandler){
		return RouterFunctions.route(
				RequestPredicates.GET("/").and(RequestPredicates.accept(TEXT_HTML)), movieHandler::movie)
				.andRoute(RequestPredicates.GET("/movie").and(RequestPredicates.accept(TEXT_HTML)), movieHandler::movie);
	}
	
	@Bean
	public RouterFunction<ServerResponse> getMoiveList(MovieHandler movieHandler){
		return RouterFunctions.route(
					RequestPredicates
						.POST("/getMovieList")
						.and(RequestPredicates.accept(APPLICATION_JSON)), 
						movieHandler::getMovieList);
	}
	
	@Bean
	public RouterFunction<ServerResponse> getMoiveListSearch(MovieHandler movieHandler){
		return RouterFunctions.route(
					RequestPredicates
						.POST("/getMovieList/{req}")
						.and(RequestPredicates.accept(APPLICATION_JSON)), 
						movieHandler::getMovieList);
	}
}

8. html소스 작성

마지막으로 뷰페이지 html소스를 작성하고 부트 프로젝트를 구동합니다.

movie.html

<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title>Movie</title>
		<style>
	    	*{padding:0; margin:0;}
	    	table tr th{background-color: #FFBB00;}
	    	table tr th, td{border: 1px solid black; text-align: center; width: 200px;padding: 5px;}
	    	.inputMovieData tr td{padding: 5px;}
	    </style>
	</head>
	<script src="https://code.jquery.com/jquery-3.4.1.js"></script>
	<body>
		<h1>WebFlux Asynchronous</h1>
		<br/><br/><br/>
		<h1>Movie List</h1>
			<table id="MovieTable">
				<tr>
					<th>제목</th>
					<th>감독</th>
					<th>연도</th>
					<th>관객수</th>
				</tr>
			</table>			
	</body>
	<script>
	$(document).ready(function(){
	    init();
	});
	
	function init(){
		reqAjaxPost("/getMovieList", "", fnSuccess);
	}
	
	function fnSuccess(res){
		if(res != null){
			var tag = "<tr><th>제목</th><th>감독</th><th>연도</th><th>관객수</th>	</tr>";
			res.forEach(function(d){
				tag += "<tr>" +
							"<td>" + d.title + "</td>" +
							"<td>" + d.director + "</td>" +
							"<td>" + d.since + "</td>" +
							"<td>" + d.audienceCnt + "</td>" +
						"</tr>";
			});
			
			$("#MovieTable").empty().append(tag);
		}
	}
	
	function reqAjaxPost(url, param, fnSuccess){
		$.ajax({
			url: url,
			type: "POST",
			data: param,
			dataType: "JSON",
			success: function(args){
				fnSuccess(args);
			},
			error: function(args){
				alert("에러가 발생했습니다.");
			}
		});
	}
	</script>
</html>

완성된 소스의 구조

스프링 부트 프로젝트를 구동합니다.

로컬 몽고DB에서 데이터를 가져와 영화정보를 파싱하는 예제를 작성해보았습니다.

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