java中，如何解决@NotBlank不生效的问题 @NotBlank @NotEmpty不生效，以及对象嵌套问题

这篇文章主要介绍了如何解决@NotBlank不生效的问题，具有很好的参考价值，希望对大家有所帮助。如有错误或未考虑完全的地方，望不吝赐教。

1.解决@NotBlank不生效

最近做一个新项目，写新接口时发现@NotBlank @NotEmpty不生效，@NotNull则生效，令人费解。仔细检查一下2步骤

用法：

step1、Controller层接口入参处加@Validated注解(org.springframework.validation.annotation包的)

step2、入参对象的属性上加@NotBlank 或@NotEmpty 或 @NotNull --均来自于javax.validation.constraints包下， 三者区别可百度

属性循环嵌套问题，入参对象bean中 属性也为javabean对象，也希望子对象中的属性能够被校验

用法： 在子对象属性上面加@Valid 注解即可

WxCollectUserinfo.java

package com.joolun.system.domain;

import com.joolun.common.annotation.Excel;
import com.joolun.common.core.domain.BaseEntity;
import com.joolun.system.domain.vo.UserVo;
import org.apache.commons.lang3.builder.ToStringBuilder;
import org.apache.commons.lang3.builder.ToStringStyle;

import javax.validation.Valid;
import javax.validation.constraints.NotBlank;
import javax.validation.constraints.NotNull;

/**
 * 门店信息对象 wx_collect_userinfo
 * 
 * @author qiaosl
 * @date 2022-10-03
 */
public class WxCollectUserinfo extends BaseEntity
{
    private static final long serialVersionUID = 1L;

    /** 主键 */
    @Excel(name = "主键")
    private Long wcuId;

    @NotNull(message = "userVo不能为空")
    @Valid
    private UserVo userVo;

    /** 门店名称 */
    @NotBlank(message = "门店名称不能为空")
    @Excel(name = "门店名称")
    private String storesName;

    /** 用户名称 */
    @NotBlank(message = "姓名不能为空")
    @Excel(name = "用户名称")
    private String userName;

    /** 门店地址 */
    @NotBlank(message = "门店地址不能为空")
    @Excel(name = "门店地址")
    private String storesAddress;

    /** 手机号码 */
    @Excel(name = "手机号码")
    @NotBlank(message = "手机号码不能为空")
    private String userTelnumber;

    public void setWcuId(Long wcuId) 
    {
        this.wcuId = wcuId;
    }

    public Long getWcuId() 
    {
        return wcuId;
    }
    public void setStoresName(String storesName) 
    {
        this.storesName = storesName;
    }

    public String getStoresName() 
    {
        return storesName;
    }
    public void setUserName(String userName) 
    {
        this.userName = userName;
    }

    public String getUserName() 
    {
        return userName;
    }
    public void setStoresAddress(String storesAddress) 
    {
        this.storesAddress = storesAddress;
    }

    public String getStoresAddress() 
    {
        return storesAddress;
    }
    public void setUserTelnumber(String userTelnumber) 
    {
        this.userTelnumber = userTelnumber;
    }

    public String getUserTelnumber() 
    {
        return userTelnumber;
    }

    public UserVo getUserVo() {
        return userVo;
    }

    public void setUserVo(UserVo userVo) {
        this.userVo = userVo;
    }

    @Override
    public String toString() {
        return new ToStringBuilder(this, ToStringStyle.MULTI_LINE_STYLE)
            .append("wcuId", getWcuId())
            .append("storesName", getStoresName())
            .append("userName", getUserName())
            .append("storesAddress", getStoresAddress())
            .append("userTelnumber", getUserTelnumber())
            .append("createBy", getCreateBy())
            .append("createTime", getCreateTime())
            .append("updateBy", getUpdateBy())
            .append("updateTime", getUpdateTime())
            .append("remark", getRemark())
            .toString();
    }
}

UserVo.java

package com.joolun.system.domain.vo;

import javax.validation.constraints.NotBlank;

public class UserVo {

    @NotBlank(message = "title不能为空")
    private String title;

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }
}