Spring（十五）数据校验

数据校验简单来说就是判断你输入的是否合法，比如用户名不能为空

1.首先创建一个UserInfo类

public class UserInfo {
    @NotNull(message = "用户名不能为空")
    @Size(min = 6,max = 20,message = "用户名必须在{min}-{max}之间")
    private String name;

    @Max(value = 150,message = "年龄不能超过150岁")
    @Min(value = 10,message = "年龄最小不能小于10岁")
    private Integer age;




    @DateTimeFormat(style = "yyyy-MM-dd")
    private Date birthday;
    @NotNull(message = "手机不能为空")
    @Pattern(regexp = "1[35789]\d{9}",message = "手机格式不正确")
    private String phone;

    @NotNull(message = "邮箱不能为空")//wfewf@qq.com
    @Pattern(regexp = "^\w+@\w+\.\w+$",message = "邮箱格式不正确")
    private String email;
    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 Date getBirthday() {
        return birthday;
    }

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

    public String getPhone() {
        return phone;
    }

    public void setPhone(String phone) {
        this.phone = phone;
    }

    public String getEmail() {
        return email;
    }

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



}

2.创建一个类：

@Controller
public class FirstController {
    @RequestMapping("/first")
    public String doFirst(@Valid UserInfo info, BindingResult br, Model model){
        if(br.getErrorCount()>0){
            FieldError name = br.getFieldError("name");
            FieldError age = br.getFieldError("age");
            FieldError birthday = br.getFieldError("birthday");
            FieldError email = br.getFieldError("email");
            FieldError phone = br.getFieldError("phone");

            if (name!=null){
                String namemsg=name.getDefaultMessage();
                model.addAttribute("namemsg",namemsg);
                model.addAttribute("namevalue",info.getName());
            }
            if (age!=null){
                String agemsg=age.getDefaultMessage();
                model.addAttribute("agemsg",agemsg);
            }
            if (birthday!=null){
                String birthdaymsg=birthday.getDefaultMessage();
                model.addAttribute("birthdaymsg",birthdaymsg);
            }
            if (email!=null){
                String emailmsg=email.getDefaultMessage();
                model.addAttribute("emailmsg",emailmsg);
            }
            if (phone!=null){
                String phonemsg=phone.getDefaultMessage();
                model.addAttribute("phonemsg",phonemsg);
            }
            return "validator";

        }
        return "success";
    }
}

3.配置文件：

4.jsp注册页面：