Spring 4 mvc에서 Restful API

dispatcher-servlet.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">

    <!-- RequestMappingHandlerMapping, RequestMappingHandlerAdapter 클래스를 빈으로 등록해줌 -->
    <mvc:annotation-driven />
    <!-- This tag allows for mapping the DispatcherServlet to "/" 이거 없으면 컨트롤러가 있어도 404에러 뜸 -->
    <mvc:default-servlet-handler />

    <!-- Process annotations on registered beans like @Autowired... -->
    <context:annotation-config/>
    <!-- 컴포넌트 스캔 -->
    <context:component-scan base-package="com.codingsquid.springMVCTest.controller" />

</beans>

pom.xml

<!-- json data bind를 위한 module (이것이 없으면 json, xml데이터 바인딩이 안됨) -->
<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.9.3</version>
</dependency>


<!-- spring mvc -->
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-webmvc</artifactId>
    <version>4.3.14.RELEASE</version>
</dependency>

<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-web</artifactId>
    <version>4.3.14.RELEASE</version>
</dependency>

<dependency>
    <groupId>javax.servlet</groupId>
    <artifactId>javax.servlet-api</artifactId>
    <version>3.1.0</version>
    <scope>provided</scope>
</dependency>

RestTest.java

package com.codingsquid.springMVCTest.dto;

import lombok.Data;

@Data
public class RestTest {

    private String name;
    private int age;
    private String currentTime;

}

RestAPITestController.java

package com.codingsquid.springMVCTest.controller;

import com.codingsquid.springMVCTest.dto.RestTest;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

import java.time.LocalDateTime;

@RestController
public class RestAPITestController {

    @RequestMapping(value = "/test", method = RequestMethod.GET)
    public RestTest testRestAPI() {
        RestTest test = new RestTest();
        test.setName("codingsquid");
        test.setAge(25);
        test.setCurrentTime(LocalDateTime.now().toString());
        return test;
    }

}

여기서 @RestController를 집고 넘어가자. @RestController는 스프링4.0부터 나온 것으로 @Controller와 @ResoponseBody를 합쳐 놓은 것이다. @Controller를 이용하여 Restful API를 만들려면 밑에 코드와 같이 @ResponseBody를 붙여야한다.

package com.codingsquid.springMVCTest.controller;

import com.codingsquid.springMVCTest.dto.RestTest;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;

import java.time.LocalDateTime;

@Controller
public class RestAPITestController {

    @RequestMapping(value = "/test", method = RequestMethod.GET)
    public @ResponseBody RestTest testRestAPI() {
        RestTest test = new RestTest();
        test.setName("codingsquid");
        test.setAge(25);
        test.setCurrentTime(LocalDateTime.now().toString());
        return test;
    }

}

참고 블로그 : http://highcode.tistory.com/24

결과