添加pom依賴：

<dependency>
    <groupId>io.springfox</groupId>
    <artifactId>springfox-swagger2</artifactId>
    <version>2.2.2</version>
</dependency>
<dependency>
    <groupId>io.springfox</groupId>
    <artifactId>springfox-swagger-ui</artifactId>
    <version>2.2.2</version>
</dependency>

創(chuàng)建Swagger2配置類：
在Application.java同級(jí)創(chuàng)建Swagger2的配置類Swagger2。

@Configuration
@EnableSwagger2
public class Swagger2 {
    @Bean
    public Docket createRestApi() {
        return new Docket(DocumentationType.SWAGGER_2)
                .apiInfo(apiInfo())
                .select()
                .apis(RequestHandlerSelectors.basePackage("com.sboot.web"))
                .paths(PathSelectors.any())
                .build();
    }
    private ApiInfo apiInfo() {
        return new ApiInfoBuilder()
                .title("My RESTful APIs")
                .description("用Swagger2構(gòu)建RESTful APIs")
                .termsOfServiceUrl("yourUrl")
                .contact("zzhblh")
                .version("1.0")
                .build();
    }
}

如上代碼所示，通過@Configuration注解，讓Spring來加載該類配置。再通過@EnableSwagger2注解來啟用Swagger2。
再通過createRestApi函數(shù)創(chuàng)建Docket的Bean之后，apiInfo()用來創(chuàng)建該Api的基本信息（這些基本信息會(huì)展現(xiàn)在文檔頁面中）。select()函數(shù)返回一個(gè)ApiSelectorBuilder實(shí)例用來控制哪些接口暴露給Swagger來展現(xiàn)，本例采用指定掃描的包路徑來定義，Swagger會(huì)掃描該包下所有Controller定義的API，并產(chǎn)生文檔內(nèi)容（除了被@ApiIgnore指定的請(qǐng)求）。

Controller：
通過@ApiOperation注解來給API增加說明、通過@ApiImplicitParams
，@ApiImplicitParam注解來給參數(shù)增加說明。

@RestController
@RequestMapping(value="/users")     // 通過這里配置使下面的映射都在/users下，可去除
public class UserController {
    static Map<Long, User> users = Collections.synchronizedMap(new HashMap<Long, User>());
    @ApiOperation(value="獲取用戶列表", notes="")
    @RequestMapping(value={""}, method=RequestMethod.GET)
    public List<User> getUserList() {
        List<User> r = new ArrayList<User>(users.values());
        return r;
    }
    @ApiOperation(value="創(chuàng)建用戶", notes="根據(jù)User對(duì)象創(chuàng)建用戶")
    @ApiImplicitParam(name = "user", value = "用戶詳細(xì)實(shí)體user", required = true, dataType = "User")
    @RequestMapping(value="", method=RequestMethod.POST)
    public String postUser(@RequestBody User user) {
        users.put(user.getId(), user);
        return "success";
    }
    @ApiOperation(value="獲取用戶詳細(xì)信息", notes="根據(jù)url的id來獲取用戶詳細(xì)信息")
    @ApiImplicitParam(name = "id", value = "用戶ID", required = true, dataType = "Long")
    @RequestMapping(value="/{id}", method=RequestMethod.GET)
    public User getUser(@PathVariable Long id) {
        return users.get(id);
    }
    @ApiOperation(value="更新用戶詳細(xì)信息", notes="根據(jù)url的id來指定更新對(duì)象，并根據(jù)傳過來的user信息來更新用戶詳細(xì)信息")
    @ApiImplicitParams({
            @ApiImplicitParam(name = "id", value = "用戶ID", required = true, dataType = "Long"),
            @ApiImplicitParam(name = "user", value = "用戶詳細(xì)實(shí)體user", required = true, dataType = "User")
    })
    @RequestMapping(value="/{id}", method=RequestMethod.PUT)
    public String putUser(@PathVariable Long id, @RequestBody User user) {
        User u = users.get(id);
        u.setName(user.getName());
        u.setAge(user.getAge());
        users.put(id, u);
        return "success";
    }
    @ApiOperation(value="刪除用戶", notes="根據(jù)url的id來指定刪除對(duì)象")
    @ApiImplicitParam(name = "id", value = "用戶ID", required = true, dataType = "Long")
    @RequestMapping(value="/{id}", method=RequestMethod.DELETE)
    public String deleteUser(@PathVariable Long id) {
        users.remove(id);
        return "success";
    }
}

查看文檔：
啟動(dòng)Spring Boot程序，訪問：http://localhost:8080/swagger-ui.html