@ApiModel(description = "用戶實(shí)體")
public class User {
    @ApiModelProperty("用戶編號")
    private Long id;
    @NotNull //校驗(yàn)定義的字段不能為空
    @Size(min = 2, max = 5)
    @ApiModelProperty("用戶姓名")
    private String name;
    @NotNull
    @Max(100)
    @Min(10)
    @ApiModelProperty("用戶年齡")
    private Integer age;
    @NotNull
    @Email
    @ApiModelProperty("用戶郵箱")
    private String email;
    public User(Long id, String name, Integer age, String email) {
        this.id = id;
        this.name = name;
        this.age = age;
        this.email = email;
    }
    public User() {
    }
    public Long getId() {
        return id;
    }
    public void setId(Long id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public Integer getAge() {
        return age;
    }
    public void setAge(Integer age) {
        this.age = age;
    }
    public String getEmail() {
        return email;
    }
    public void setEmail(String email) {
        this.email = email;
    }
    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", age=" + age +
                ", email='" + email + '\'' +
                '}';
    }
    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        User user = (User) o;
        return Objects.equals(id, user.id) && Objects.equals(name, user.name) && Objects.equals(age, user.age) && Objects.equals(email, user.email);
    }
    @Override
    public int hashCode() {
        return Objects.hash(id, name, age, email);
    }
}

@Api(tags = "用戶管理")
@RestController
@RequestMapping(value = "/users")     // 通過這里配置使下面的映射都在/users下
public class UserController {
    // 創(chuàng)建線程安全的Map，模擬users信息的存儲
    static Map<Long, User> users = Collections.synchronizedMap(new HashMap<>());
    @GetMapping("/")
    @ApiOperation(value = "獲取用戶列表")
    public List<User> getUserList() {
        List<User> r = new ArrayList<>(users.values());
        return r;
    }
    @PostMapping("/")
    @ApiOperation(value = "創(chuàng)建用戶", notes = "根據(jù)User對象創(chuàng)建用戶")
    public String postUser(@Valid @RequestBody User user) {
        users.put(user.getId(), user);
        return "success";
    }
    @GetMapping("/{id}")
    @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")
    public User getUser(@PathVariable Long id) {
        return users.get(id);
    }
    @PutMapping("/{id}")
    @ApiImplicitParam(paramType = "path", dataType = "Long", name = "id", value = "用戶編號", required = true, example = "1")
    @ApiOperation(value = "更新用戶詳細(xì)信息", notes = "根據(jù)url的id來指定更新對象，并根據(jù)傳過來的user信息來更新用戶詳細(xì)信息")
    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";
    }
    @DeleteMapping("/{id}")
    @ApiOperation(value = "刪除用戶", notes = "根據(jù)url的id來指定刪除對象")
    public String deleteUser(@PathVariable Long id) {
        users.remove(id);
        return "success";
    }
}

curl -X POST \
  http://localhost:8080/users/ \
  -H 'Content-Type: application/json' \
  -H 'Postman-Token: 114db0f0-bdce-4ba5-baf6-01e5104a68a3' \
  -H 'cache-control: no-cache' \
  -d '{
    "name": "abcdefg",
    "age": 8,
    "email": "aaaa"
}'

{
    "timestamp": "2019-10-05T06:24:30.518+0000",
    "status": 400,
    "error": "Bad Request",
    "errors": [
        {
            "codes": [
                "Size.user.name",
                "Size.name",
                "Size.java.lang.String",
                "Size"
            ],
            "arguments": [
                {
                    "codes": [
                        "user.name",
                        "name"
                    ],
                    "arguments": null,
                    "defaultMessage": "name",
                    "code": "name"
                },
                5,
                2
            ],
            "defaultMessage": "個(gè)數(shù)必須在2和5之間",
            "objectName": "user",
            "field": "name",
            "rejectedValue": "abcdefg",
            "bindingFailure": false,
            "code": "Size"
        },
        {
            "codes": [
                "Min.user.age",
                "Min.age",
                "Min.java.lang.Integer",
                "Min"
            ],
            "arguments": [
                {
                    "codes": [
                        "user.age",
                        "age"
                    ],
                    "arguments": null,
                    "defaultMessage": "age",
                    "code": "age"
                },
                10
            ],
            "defaultMessage": "最小不能小于10",
            "objectName": "user",
            "field": "age",
            "rejectedValue": 8,
            "bindingFailure": false,
            "code": "Min"
        },
        {
            "codes": [
                "Email.user.email",
                "Email.email",
                "Email.java.lang.String",
                "Email"
            ],
            "arguments": [
                {
                    "codes": [
                        "user.email",
                        "email"
                    ],
                    "arguments": null,
                    "defaultMessage": "email",
                    "code": "email"
                },
                [],
                {
                    "defaultMessage": ".*",
                    "codes": [
                        ".*"
                    ],
                    "arguments": null
                }
            ],
            "defaultMessage": "不是一個(gè)合法的電子郵件地址",
            "objectName": "user",
            "field": "email",
            "rejectedValue": "aaaa",
            "bindingFailure": false,
            "code": "Email"
        }
    ],
    "message": "Validation failed for object='user'. Error count: 3",
    "path": "/users/"
}