Swagger——一个规范和完整的框架，用于接口的文档在线自动生成。

1、描述

Swagger 是一个规范和完整的框架，用于生成、描述、调用和可视化 RESTful 风格的 Web 服务。

作用：

1.接口的文档在线自动生成。

2.功能测试。

2、运用

a) maven导入Swagger

b) 创建Swagger2配置类

3、注解及其说明

@Api : 用在类上，说明该类的主要作用。

@ApiOperation：用在方法上，给API增加方法说明。

@ApiImplicitParams : 用在方法上，包含一组参数说明。

@ApiImplicitParam：用来注解来给方法入参增加说明。

@ApiResponses：用于表示一组响应。

@ApiResponse：用在@ApiResponses中，一般用于表达一个错误的响应信息

​ l code：数字，例如400

​ l message：信息，例如"请求参数没填好"

​ l response：抛出异常的类

@ApiModel：用在返回对象类上，描述一个Model的信息（一般用在请求参数无法使用@ApiImplicitParam注解进行描述的时候）

​ l @ApiModelProperty：描述一个model的属性

@RestController
@RequestMapping("emp")
@Api(value = "用户管理类")
public class EmployeeController {
​
 @Autowired
 private EmployeeReposiroty employeeReposiroty;

/**
      * 增加人物
      * @param employee
      * @return
      */

 @PostMapping(value = "employee") 

@ApiOperation(value = "新增一个用户",notes = "新增之后返回对象") 
//@ApiOperation：用在方法上，给API增加方法说明。
@ApiImplicitParam(paramType = "query",name = "employee",value = "用户",required = true)
//@ApiImplicitParam：用来注解来给方法入参增加说明。
 @ApiResponse(code = 400,message = "参数没有填好",response = String.class) public String insert(Employee employee){ Employee employee1 = employeeReposiroty.save(employee); if(employee1 != null) { return SysNode.Judge.SUCCESS.getResult(); }else { return SysNode.Judge.FAILD.getResult(); } }

//@ApiResponse：用在@ApiResponses中，一般用于表达一个错误的响应信息

/**
    * 删除单个用户
      * @param id
      * @return
      */@DeleteMapping(value = "employee/{id}")      //两个参数名必须保持一致
      @ApiOperation(value = "删除用户",notes = "根据成员id删除单个用户")
      @ApiImplicitParam(paramType = "path",name = "id",value = "用户id",required = true,dataType = "Integer")
      @ApiResponse(code = 400,message = "参数没有填好",response = String.class)

      public String delete(@PathVariable("id")Integer id){    //占位映射符     
@PathVariable是spring3.0的一个新功能：接收请求路径中占位符的值
语法：

• @PathVariable("xxx")
•  通过 @PathVariable 可以将URL中占位符参数{xxx}绑定到处理器类的方法形参中@PathVariable(“xxx“) 
• @RequestMapping(value=”user/{id}/{name}”)

  

           try{
                employeeReposiroty.deleteById(id);
                return SysNode.Judge.SUCCESS.getResult();
           }catch (Exception e){
                e.printStackTrace();
               return SysNode.Judge.FAILD.getResult();
           }
      }
​
      /**
      * 修改单个成员
      * @param employee
      * @return
      */
      @PutMapping(value = "employee/{id}")
      @ApiOperation(value = "修改用户信息",notes = "根据成员id修改单个用户")
      @ApiImplicitParam(paramType = "path",name = "id",value = "用户id",required = true,dataType = "Integer")
      public String update(Employee employee){
           /**
           * save方法如果参数属性缺失，会导致原本存在的数据为null
           */
           Employee employee1 = employeeReposiroty.saveAndFlush(employee);
           if (employee1 != null) {
                return SysNode.Judge.SUCCESS.getResult();
           }else {
               return SysNode.Judge.FAILD.getResult();
           }
      }
​
      /**
      * 获取所有成员,升序排列
      * @return
      */
      @GetMapping(value = "employee/sort")
      @ApiOperation(value = "查询全部用户",notes = "默认根据升序查询全部用户信息")
      public List<Employee> findAll(){
           Sort orders = new Sort(Sort.Direction.DESC,"employeeId");
           List<Employee> employeeList = employeeReposiroty.findAll(orders);
           return employeeList;
      }
​
      /**
     * 获取所有成员,升序排列
     * @return
      */
      @GetMapping(value = "employee/pageSort")
      @ApiOperation(value = "查询用户信息",notes = "查询用户信息")
      @ApiImplicitParams({
           @ApiImplicitParam(paramType = "query",name = "sort",value = "排序方式:asc|desc",dataType = "String",required = true),
           @ApiImplicitParam(paramType = "query",name = "pagenumber",value = "第几页",dataType = "Integer",required = true),
           @ApiImplicitParam(paramType = "query",name = "pageSize",value = "分页数",dataType = "Integer",required = true)
      })
      public List<Employee> findAllByPage(String sort,Integer pagenumber,Integer pageSize){
           try {
                Sort.Direction sortlast;
                if("desc".equals(sort.toLowerCase())){
                     sortlast = Sort.Direction.DESC;
               }else{          
                      sortlast = Sort.Direction.ASC;
               }
                     Sort orders = new Sort(sortlast, "employeeId");
                     Pageable pageable = new PageRequest(pagenumber, pageSize, orders);
​
                     Page<Employee> employeePage = employeeReposiroty.findAll(pageable);
                     List<Employee> employeeList = employeePage.getContent();
                     return employeeList;
           }catch (Exception e){
                e.printStackTrace();
                return null;
           }
      }
    /**
     * 自定义拓展jpa，根据用户名查找单个用户
     * @param username
     * @return
     */
     @GetMapping(value = "employee/find/{username}")
     @ApiOperation(value = "查询用户信息",notes = "根据用户登录名查询该用户信息")
     @ApiImplicitParam(paramType = "path",name = "username",value = "用户登录名",required = true,dataType = "String")
     public Employee findByUsername(@PathVariable("username") String username){
         List<Employee> employeeList = employeeReposiroty.findByUserNameOrderByEmployeeIdAsc(username);
         if (employeeList != null && !employeeList.isEmpty()){
             return employeeList.get(0);
         }
         return null;
     }
​
     /**
     * 测试用
     * @return
     */
     @GetMapping(value = "employee/grade")
     public List<Object[]> findEmployeeAndGrade(){
         Pageable pageable = new PageRequest(0,3);
​
         Page<Object[]> page = employeeReposiroty.findEmployeeAndGrade(pageable);
         System.out.println(page.getTotalElements()+"----------结果总数------------");
         System.out.println(page.getTotalPages()+"--------根据pageSize的总页数-----------");
         System.out.println(page.getNumber()+"--------当前页数，pageNumber----------");
         System.out.println(page.getNumberOfElements()+"--------当前页有几个数据--------");
         System.out.println(page.getSize()+"---------PageSize-------------");
         System.out.println(page.getSort()+"---------排序方式，没有则是'UNSORTED'----------");
​
         List<Object[]> objects = page.getContent();
         return objects;
    }
}

4、测试登录 localhost:8080/swagger-ui.html

API 操作测试，修改

5、@ApiModel 接收对象传参

注意： 在后台采用对象接收参数时，Swagger自带的工具采用的是JSON传参， 测试时需要在参数上加入@RequestBody,正常运行采用form或URL提交时候请删除。

/**
 * @program: jpademo
 * @description: Employee
 * @author: ZengGuangfu
 * @create 2018-10-23 10:20
 */
​
​
@Getter
@Setter
@Data
@Entity
@Table(name = "employee")
@ApiModel(value = "用户对象模型")
public class Employee {
​
   @Id
   @GeneratedValue(strategy = GenerationType.IDENTITY)
   @Column(name = "employee_id")
   @Min(value = 1,groups = Employee.Children.class)
   private Integer employeeId;
​
   @Column(name = "user_name",length = 20,nullable = true)
   @ApiModelProperty(value = "userName",required = true)
   private String userName;
​
   @Column(nullable = true)
   @Size(min = 0,max = 65,message = "年龄超过范围限制",groups = Employee.Audit.class)
   @ApiModelProperty(value = "age",required = true)
   private Integer age;
​
   @Column(name="gra_id")
   @ApiModelProperty(value = "graId",required = true)
   //@Digits(integer = 12,fraction = 4)  //限制必须为一个小数，且整数部分的 位数 不能超过integer，小数部分的 位数 不能超过fraction
   private Integer graId;
​
   public interface Audit{};
​
   public interface Children{};
​
}