24. 스프링 REST API 사용하기

// 스프링 3 방식: 메서드마다 @ResponseBody
@Controller
public class OldController {

    @RequestMapping("/api/data")
    @ResponseBody
    public String getData() {
        return "hello";
    }
}

// 스프링 4 방식: 클래스에 @RestController
@RestController
public class NewController {

    @RequestMapping("/api/data")
    public String getData() {
        return "hello";
    }
}

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.5.4</version>
</dependency>

@RestController
@RequestMapping("/test")
public class TestController {

    // /test/notice/10 요청 시
    // num = 10
    @RequestMapping(
        value = "/notice/{num}",
        method = RequestMethod.GET)
    public int notice(
        @PathVariable("num") int num)
        throws Exception {
        return num;
    }
}

@RequestMapping("/boards/{category}/{id}")
public Board getBoard(
    @PathVariable("category") String category,
    @PathVariable("id") int id) {

    return boardService
        .findByCategoryAndId(category, id);
}

@RequestMapping(
    value = "/members",
    method = RequestMethod.POST)
public String addMember(
    @RequestBody MemberVO member) {

    memberService.add(member);
    return "success";
}

@Controller
public class BoardController {

    // JSP 반환 (기본)
    @RequestMapping("/list")
    public String list(Model model) {
        model.addAttribute("boards",
            boardService.findAll());
        return "boardList";  // JSP 이름
    }

    // 데이터 직접 반환
    @RequestMapping("/api/list")
    @ResponseBody
    public List<BoardVO> apiList() {
        return boardService.findAll();
        // JSON 변환되어 전송
    }
}

@RequestMapping("/members/{id}")
public ResponseEntity<MemberVO> getMember(
    @PathVariable("id") int id) {

    MemberVO member =
        memberService.findById(id);

    if (member == null) {
        return ResponseEntity
            .status(HttpStatus.NOT_FOUND)
            .body(null);
    }
    return ResponseEntity
        .status(HttpStatus.OK)
        .body(member);
}

@RestController
@RequestMapping("/boards")
public class BoardController {

    @Autowired
    private BoardService boardService;

    // 새 글 등록
    @RequestMapping(
        method = RequestMethod.POST)
    public ResponseEntity<String> create(
        @RequestBody BoardVO board) {
        boardService.add(board);
        return ResponseEntity
            .status(HttpStatus.CREATED)
            .body("등록 성공");
    }

    // 글 조회
    @RequestMapping(
        value = "/{id}",
        method = RequestMethod.GET)
    public ResponseEntity<BoardVO> read(
        @PathVariable("id") int id) {
        BoardVO board =
            boardService.findById(id);
        return ResponseEntity.ok(board);
    }

    // 글 수정
    @RequestMapping(
        value = "/{id}",
        method = RequestMethod.PUT)
    public ResponseEntity<String> update(
        @PathVariable("id") int id,
        @RequestBody BoardVO board) {
        board.setId(id);
        boardService.update(board);
        return ResponseEntity.ok("수정 성공");
    }

    // 글 삭제
    @RequestMapping(
        value = "/{id}",
        method = RequestMethod.DELETE)
    public ResponseEntity<String> delete(
        @PathVariable("id") int id) {
        boardService.delete(id);
        return ResponseEntity.ok("삭제 성공");
    }
}

<filter>
    <filter-name>
        httpMethodFilter
    </filter-name>
    <filter-class>
        org.springframework.web.filter
        .HiddenHttpMethodFilter
    </filter-class>
</filter>
<filter-mapping>
    <filter-name>
        httpMethodFilter
    </filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>