springmvc_参数校验自定义注解

javax.validation.Valid

@Valid启用实体类中的自定义注解,BindingResult 用来返回错误信息

//import org.springframework.validation.BindingResult;
//import org.springframework.validation.Errors;
public Xxxx login(@Valid xxxModel , BindingResult bindingResult){
    if(bindingResult.hasErrors()){//返回具体的错误信息
      System.out.println("message="+bindingResult.getFieldError().getDefaultMessage());  //返回的具体信息
    }
}
public Xxxx login(@Valid xxxModel , Errors errors){
if(errors != null && errors.hasErrors()){
  String message = errors.getAllErrors().stream()
    .filter(objectError -> objectError instanceof FieldError)
    .map(objectError -> {
        FieldError fieldError = (FieldError) objectError;
        return "{" + fieldError.getField() + "}" + fieldError.getDefaultMessage();
        })
    .collect(Collectors.joining(";"));
  System.out.println("message="+message);
}
}
常用的自定义注解
@NotEmpty(message = "password 为空")   //javax.validation.constraints.NotEmpty;
@Min //不能低于某个值
@AssertFalse //该字段为false时才能验证通过
@AssertTrue  //该字段为true时才能验证通过
@DecimalMax  //验证小数的最大值@DecimalMax(value = "12.35")
@DecimalMin  //验证小数的最小值
@Digits(integer = 2, fraction = 2) //验证数字的整数位和小数位的位数是否超过指定的长度 private double money;
---日期---
@Future //必须在当前日期之后 private Date date;
@Past //必须在当前日期之前 private Date date ;
@Pattern(regexp = "[abc]") //与给定的正则相配制

自己实现自定义校验注解 

自定义的注解里必须有这几样要素
a.  String message() default "";
b.  public Class<?>[] groups() default {};
c.  Class<? extends Payload>[] payload() default {};
@Constraint(validatedBy = Xxxx.class)  指定具体的约束类(也可以为内部类) 用来实现自定义的校验规则

import javax.validation.ConstraintValidator;

import com.qbsea.mysboot2common.modlues.app.service.AppService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import javax.validation.Constraint;
import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;
import javax.validation.Payload;
import java.lang.annotation.*;
import static java.lang.annotation.ElementType.FIELD;
import static java.lang.annotation.ElementType.METHOD;


@Target({FIELD,METHOD})
@Retention(RetentionPolicy.RUNTIME)
@Constraint(validatedBy = {MqbStringChecker.IsMobileValidator.class})
@Inherited
@Documented
public @interface MqbStringChecker {
    String message() default "手机号不正确";
    public Class<?>[] groups() default {};
    Class<? extends Payload>[] payload() default {};

    @Service
    class IsMobileValidator implements ConstraintValidator<MqbStringChecker,String> {
        @Autowired
        AppService appService;

        @Override
        public boolean isValid(String value, ConstraintValidatorContext context) {
            System.out.println(appService.findBy().get());
            if(value.startsWith("150")){//测试不能能150开头的手机号
                return false;
            }
            return true;
        }
    }
}