@Valid 注解的使用

逃离我推掉我的手 2022-04-11 10:13 327阅读 0赞

一、引入依赖包

<dependency>
        <groupId>javax.validation</groupId>
        <artifactId>validation-api</artifactId>
        <version>2.0.1.Final</version>
    </dependency>

二、实体类

import javax.validation.constraints.NotBlank;
    @TableName("sys_user")
    public class SysUser extends CurdEntity {
        @NotBlank(message="buenngweikong！")
        private String userName;
        //get set略
    }

三、controller---使用校验必须要加@Valid

//测试使用后台数据校验
    @PostMapping(value = "save111")
    public MsgBody save111(HttpServletRequest request,@Valid @RequestBody SysUser sysUser, BindingResult result ){
        MsgBody msgBody = new MsgBody();
       // 校验是否有问题result是validation里面出错的集合
       if(result.hasErrors()){
            List<ObjectError> ls=result.getAllErrors();
            for (int i = 0; i < ls.size(); i++) {
                System.out.println("error:"+ls.get(i).getDefaultMessage());
                msgBody.setMsg(ls.get(i).getDefaultMessage());
                return  msgBody;
            }
        }
        msgBody.setCode(Constant.Error.getCode());
        msgBody.setMsg("保存数据失败");
        try{
            getBaseService().save(sysUser);
            msgBody.setCode(Constant.Success.getCode());
            msgBody.setMsg("保存数据成功");
        }catch (RuntimeException e){
            msgBody.setCode(Constant.Error.getCode());
        }
        return  msgBody;
    }

四、jsp 方法 （这里对ajax传参有遇到些问题有兴趣的可以看看---》 [https://mp.csdn.net/postedit/84838789][https_mp.csdn.net_postedit_84838789]）

function login(){
        $.ajax({
            type:'post',
            url:'${ctx}/sysUser/save111',
            contentType:"application/json;charset=UTF-8",
            data:JSON.stringify({
                'userName':$('#userName').val(),
                'password':$('#password').val()
            }),
            dataType:"json",
            success:function (date) {
                console.log(date.msg)
            }
        });
    }

五、若这边name空值

![20181205164848650.png][]

执行login()方法之后执行代码如下

![20181205165104213.png][]

控制台

![20181205165156575.png][]（ @NotBlank(message="buenngweikong！")）

jsp控制台输出（ console.log(date.msg)）

![20181205165244540.png][]

六、到这里就完全成功了

[https_mp.csdn.net_postedit_84838789]: https://mp.csdn.net/postedit/84838789
[20181205164848650.png]: /images/20220411/198c217aac2c44649a51205ce07672fa.png
[20181205165104213.png]: /images/20220411/9c9a865281a949feb91b8f3f4d7e40d1.png
[20181205165156575.png]: /images/20220411/df38bcfdf6f64aa0b01da7b73e797ab6.png
[20181205165244540.png]: /images/20220411/0e8dbf9ded104a8c903edcb9d333cb00.png