springboot 传入对象信息的验证

因为比较简单，所以留下真实代码，看了就懂了

package com.imooc.pojo.bo.center;

import io.swagger.annotations.ApiModel;
import io.swagger.annotations.ApiModelProperty;
import org.hibernate.validator.constraints.Length;

import javax.validation.constraints.*;
import java.util.Date;

@ApiModel(value="用户对象", description="从客户端，由用户传入的数据封装在此entity中")
public class CenterUserBO {

    @ApiModelProperty(value="用户名", name="username", example="json", required = false)
    private String username;
    @ApiModelProperty(value="密码", name="password", example="123456", required = false)
    private String password;
    @ApiModelProperty(value="确认密码", name="confirmPassword", example="123456", required = false)
    private String confirmPassword;


    @NotBlank(message = "用户昵称不能为空")
    @Length(max = 12, message = "用户昵称不能超过12位")
    @ApiModelProperty(value="用户昵称", name="nickname", example="杰森", required = false)
    private String nickname;

    @Length(max = 12, message = "用户真实姓名不能超过12位")
    @ApiModelProperty(value="真实姓名", name="realname", example="杰森", required = false)
    private String realname;

    @Pattern(regexp = "^(((13[0-9]{1})|(15[0-9]{1})|(18[0-9]{1}))+\\d{8})$", message = "手机号格式不正确")
    @ApiModelProperty(value="手机号", name="mobile", example="13999999999", required = false)
    private String mobile;

    @Email
    @ApiModelProperty(value="邮箱地址", name="email", example="[e-mail]", required = false)
    private String email;

    @Min(value = 0, message = "性别选择不正确")
    @Max(value = 2, message = "性别选择不正确")
    @ApiModelProperty(value="性别", name="sex", example="0:女 1:男 2:保密", required = false)
    private Integer sex;
    @ApiModelProperty(value="生日", name="birthday", example="1900-01-01", required = false)
    private Date birthday;

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getConfirmPassword() {
        return confirmPassword;
    }

    public void setConfirmPassword(String confirmPassword) {
        this.confirmPassword = confirmPassword;
    }

    public String getNickname() {
        return nickname;
    }

    public void setNickname(String nickname) {
        this.nickname = nickname;
    }

    public String getRealname() {
        return realname;
    }

    public void setRealname(String realname) {
        this.realname = realname;
    }

    public String getMobile() {
        return mobile;
    }

    public void setMobile(String mobile) {
        this.mobile = mobile;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public Integer getSex() {
        return sex;
    }

    public void setSex(Integer sex) {
        this.sex = sex;
    }

    public Date getBirthday() {
        return birthday;
    }

    public void setBirthday(Date birthday) {
        this.birthday = birthday;
    }

    @Override
    public String toString() {
        return "CenterUserBO{" +
                "username='" + username + '\'' +
                ", password='" + password + '\'' +
                ", confirmPassword='" + confirmPassword + '\'' +
                ", nickname='" + nickname + '\'' +
                ", realname='" + realname + '\'' +
                ", mobile='" + mobile + '\'' +
                ", email='" + email + '\'' +
                ", sex=" + sex +
                ", birthday=" + birthday +
                '}';
    }
}

可以看到验证信息的注解有@NotBlank @Length等等 ，那么在controller怎么去做呢，如下：

@ApiOperation(value = "修改用户信息", notes = "修改用户信息", httpMethod = "POST")
    @PostMapping("update")
    public IMOOCJSONResult update(
            @ApiParam(name = "userId", value = "用户id", required = true)
            @RequestParam String userId,
            @RequestBody @Valid CenterUserBO centerUserBO,
            BindingResult result,
            HttpServletRequest request, HttpServletResponse response) {

        System.out.println(centerUserBO);

        // 判断BindingResult是否保存错误的验证信息，如果有，则直接return
        if (result.hasErrors()) {
            Map<String, String> errorMap = getErrors(result);
            return IMOOCJSONResult.errorMap(errorMap);
        }

        Users userResult = centerUserService.updateUserInfo(userId, centerUserBO);

        userResult = setNullProperty(userResult);
        CookieUtils.setCookie(request, response, "user",
                JsonUtils.objectToJson(userResult), true);

        // TODO 后续要改，增加令牌token，会整合进redis，分布式会话

        return IMOOCJSONResult.ok();
    }

private Map<String, String> getErrors(BindingResult result) {
        Map<String, String> map = new HashMap<>();
        List<FieldError> errorList = result.getFieldErrors();
        for (FieldError error : errorList) {
            // 发生验证错误所对应的某一个属性
            String errorField = error.getField();
            // 验证错误的信息
            String errorMsg = error.getDefaultMessage();

            map.put(errorField, errorMsg);
        }
        return map;
    }

接收参数的地方加上 @Valid，然后报错信息由BindingResult来接收，并进行逻辑处理即可