Spring Boot를 기반으로 API 주석 및 문서 생성을 구현하는 방법

<dependency>
   <groupId>io.springfox</groupId>
   <artifactId>springfox-swagger2</artifactId>
   <version>2.9.2</version>
</dependency>

<dependency>
   <groupId>io.springfox</groupId>
   <artifactId>springfox-swagger-ui</artifactId>
   <version>2.9.2</version>
</dependency>

@SpringBootApplication
@EnableSwagger2
public class DemoApplication {
   public static void main(String[] args) {
      SpringApplication.run(DemoApplication.class, args);
   }
}

@RestController
@RequestMapping("/user")
public class UserController {
  
   @ApiOperation(value = "获取用户列表", notes = "获取所有用户的列表")
   @GetMapping("/list")
   public List<User> getUserList() {
      return userService.getUserList();
   }
  
   @ApiOperation(value = "创建用户", notes = "根据User对象创建用户")
   @PostMapping("/")
   public String postUser(@RequestBody User user) {
      userService.saveUser(user);
      return "success";
   }
  
   @ApiOperation(value = "获取用户详情", notes = "根据id获取用户的详情")
   @GetMapping("/{id}")
   public User getUser(@PathVariable Long id) {
      return userService.getUserById(id);
   }
  
   @ApiOperation(value = "更新用户信息", notes = "根据id更新用户的信息")
   @PutMapping("/{id}")
   public String putUser(@PathVariable Long id, @RequestBody User user) {
      User u = userService.getUserById(id);
      if (u == null) {
          return "用户不存在";
      }
      userService.updateUser(user);
      return "success";
   }
  
   @ApiOperation(value = "删除用户", notes = "根据id删除用户")
   @DeleteMapping("/{id}")
   public String deleteUser(@PathVariable Long id) {
      User u = userService.getUserById(id);
      if (u == null) {
          return "用户不存在";
      }
      userService.deleteUser(id);
      return "success";
   }
}

<dependency>
   <groupId>org.springframework.restdocs</groupId>
   <artifactId>spring-restdocs-mockmvc</artifactId>
   <version>2.0.2.RELEASE</version>
</dependency>

@RunWith(SpringRunner.class)
@WebMvcTest(UserController.class)
public class UserControllerTests {
  
   @Autowired
   private MockMvc mockMvc;
  
   @Test
   public void getUserList() throws Exception {
      this.mockMvc.perform(get("/user/list"))
         .andExpect(status().isOk())
         .andDo(document("getUserList", 
             responseFields(
                 fieldWithPath("[].id").description("用户ID"),
                 fieldWithPath("[].name").description("用户名"),
                 fieldWithPath("[].age").description("用户年龄")
             )));
   }
  
   @Test
   public void postUser() throws Exception {
      User user = new User();
      user.setName("Tom");
      user.setAge(20);
      ObjectMapper mapper = new ObjectMapper();
      String userJson = mapper.writeValueAsString(user);
      this.mockMvc.perform(post("/user/")
         .contentType(MediaType.APPLICATION_JSON)
         .content(userJson))
         .andExpect(status().isOk())
         .andDo(document("postUser", 
             requestFields(
                 fieldWithPath("name").description("用户名"),
                 fieldWithPath("age").description("用户年龄")
             )));
   }
  
   @Test
   public void getUser() throws Exception {
      this.mockMvc.perform(get("/user/{id}", 1))
         .andExpect(status().isOk())
         .andDo(document("getUser", 
             pathParameters(
                 parameterWithName("id").description("用户ID")
             ),
             responseFields(
                 fieldWithPath("id").description("用户ID"),
                 fieldWithPath("name").description("用户名"),
                 fieldWithPath("age").description("用户年龄")
             )));
   }
  
   @Test
   public void putUser() throws Exception {
      User user = new User();
      user.setName("Tom");
      user.setAge(20);
      ObjectMapper mapper = new ObjectMapper();
      String userJson = mapper.writeValueAsString(user);
      this.mockMvc.perform(put("/user/{id}", 1)
         .contentType(MediaType.APPLICATION_JSON)
         .content(userJson))
         .andExpect(status().isOk())
         .andDo(document("putUser", 
             pathParameters(
                 parameterWithName("id").description("用户ID")
             ),
             requestFields(
                 fieldWithPath("name").description("用户名"),
                 fieldWithPath("age").description("用户年龄")
             )));
   }
  
   @Test
   public void deleteUser() throws Exception {
      this.mockMvc.perform(delete("/user/{id}", 1))
         .andExpect(status().isOk())
         .andDo(document("deleteUser", 
             pathParameters(
                 parameterWithName("id").description("用户ID")
             )));
   }
}