<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>

package com.abel.example;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import springfox.documentation.builders.ApiInfoBuilder;
import springfox.documentation.builders.PathSelectors;
import springfox.documentation.builders.RequestHandlerSelectors;
import springfox.documentation.service.ApiInfo;
import springfox.documentation.spi.DocumentationType;
import springfox.documentation.spring.web.plugins.Docket;
import springfox.documentation.swagger2.annotations.EnableSwagger2;
/**
 * Created by yangyibo on 2018/9/7.
 */
@Configuration
@EnableSwagger2
public class Swagger2 {
  /**
   * 創(chuàng)建API應(yīng)用
   * apiInfo() 增加API相關(guān)信息
   * 通過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指定要建立API的目錄。
   * @return
   */
  @Bean
  public Docket createRestApi() {
    return new Docket(DocumentationType.SWAGGER_2)
        .apiInfo(apiInfo())
        .select()
        .apis(RequestHandlerSelectors.basePackage("com.abel.example.controller"))
        .paths(PathSelectors.any())
        .build();
  }
  /**
   * 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）
   * 訪問地址：http://項(xiàng)目實(shí)際地址/swagger-ui.html
   * @return
   */
  private ApiInfo apiInfo() {
    return new ApiInfoBuilder()
        .title("Spring Boot中使用Swagger2構(gòu)建RESTful APIs")
        .description("更多請(qǐng)關(guān)注https://blog.csdn.net/u012373815")
        .termsOfServiceUrl("https://blog.csdn.net/u012373815")
        .contact("abel")
        .version("1.0")
        .build();
  }
}

package com.abel.example.controller;
import javax.servlet.http.HttpServletRequest;
import java.util.Map;
import com.abel.example.bean.User;
import io.swagger.annotations.*;
import org.apache.log4j.Logger;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;
import com.abel.example.service.UserService;
import com.abel.example.util.CommonUtil;
@Controller
@RequestMapping(value = "/users")
@Api(value = "用戶的增刪改查")
public class UserController {
  @Autowired
  private UserService userService;
  /**
   * 查詢所有的用戶
   * api :localhost:8099/users
   * @return
   */
  @RequestMapping(method = RequestMethod.GET)
  @ResponseBody
  @ApiOperation(value = "獲取用戶列表，目前沒有分頁")
  public ResponseEntity<Object> findAll() {
    return new ResponseEntity<>(userService.listUsers(), HttpStatus.OK);
  }
  /**
   * 通過id 查找用戶
   * api :localhost:8099/users/1
   * @param id
   * @return
   */
  @RequestMapping(value = "/{id}", method = RequestMethod.GET)
  @ResponseBody
  @ApiOperation(value = "通過id獲取用戶信息", notes="返回用戶信息")
  public ResponseEntity<Object> getUserById(@PathVariable Integer id) {
    return new ResponseEntity<>(userService.getUserById(Long.valueOf(id)), HttpStatus.OK);
  }
  /**
   * 通過spring data jpa 調(diào)用方法
   * api :localhost:8099/users/byname?username=xxx
   * 通過用戶名查找用戶
   * @param request
   * @return
   */
  @RequestMapping(value = "/byname", method = RequestMethod.GET)
  @ResponseBody
  @ApiImplicitParam(paramType = "query",name= "username" ,value = "用戶名",dataType = "string")
  @ApiOperation(value = "通過用戶名獲取用戶信息", notes="返回用戶信息")
  public ResponseEntity<Object> getUserByUserName(HttpServletRequest request) {
    Map<String, Object> map = CommonUtil.getParameterMap(request);
    String username = (String) map.get("username");
    return new ResponseEntity<>(userService.getUserByUserName(username), HttpStatus.OK);
  }
  /**
   * 通過spring data jpa 調(diào)用方法
   * api :localhost:8099/users/byUserNameContain?username=xxx
   * 通過用戶名模糊查詢
   * @param request
   * @return
   */
  @RequestMapping(value = "/byUserNameContain", method = RequestMethod.GET)
  @ResponseBody
  @ApiImplicitParam(paramType = "query",name= "username" ,value = "用戶名",dataType = "string")
  @ApiOperation(value = "通過用戶名模糊搜索用戶信息", notes="返回用戶信息")
  public ResponseEntity<Object> getUsers(HttpServletRequest request) {
    Map<String, Object> map = CommonUtil.getParameterMap(request);
    String username = (String) map.get("username");
    return new ResponseEntity<>(userService.getByUsernameContaining(username), HttpStatus.OK);
  }
  /**
   * 添加用戶啊
   * api :localhost:8099/users
   * @param user
   * @return
   */
  @RequestMapping(method = RequestMethod.POST)
  @ResponseBody
  @ApiModelProperty(value="user",notes = "用戶信息的json串")
  @ApiOperation(value = "新增用戶", notes="返回新增的用戶信息")
  public ResponseEntity<Object> saveUser(@RequestBody User user) {
    return new ResponseEntity<>(userService.saveUser(user), HttpStatus.OK);
  }
  /**
   * 修改用戶信息
   * api :localhost:8099/users
   * @param user
   * @return
   */
  @RequestMapping(method = RequestMethod.PUT)
  @ResponseBody
  @ApiModelProperty(value="user",notes = "修改后用戶信息的json串")
  @ApiOperation(value = "新增用戶", notes="返回新增的用戶信息")
  public ResponseEntity<Object> updateUser(@RequestBody User user) {
    return new ResponseEntity<>(userService.updateUser(user), HttpStatus.OK);
  }
  /**
   * 通過ID刪除用戶
   * api :localhost:8099/users/2
   * @param id
   * @return
   */
  @RequestMapping(value = "/{id}", method = RequestMethod.DELETE)
  @ResponseBody
  @ApiOperation(value = "通過id刪除用戶信息", notes="返回刪除狀態(tài)1 成功 0 失敗")
  public ResponseEntity<Object> deleteUser(@PathVariable Integer id) {
    return new ResponseEntity<>(userService.removeUser(id.longValue()), HttpStatus.OK);
  }
}

@Api：用在類上，說明該類的作用。
@ApiOperation：注解來給API增加方法說明。
@ApiImplicitParams : 用在方法上包含一組參數(shù)說明。
@ApiImplicitParam：用來注解來給方法入?yún)⒃黾诱f明。
@ApiResponses：用于表示一組響應(yīng)
@ApiResponse：用在@ApiResponses中，一般用于表達(dá)一個(gè)錯(cuò)誤的響應(yīng)信息
   code：數(shù)字，例如400
   message：信息，例如"請(qǐng)求參數(shù)沒填好"
   response：拋出異常的類  
@ApiModel：描述一個(gè)Model的信息（一般用在請(qǐng)求參數(shù)無法使用@ApiImplicitParam注解進(jìn)行描述的時(shí)候）
@ApiModelProperty：描述一個(gè)model的屬性