問題描述

我想使用注釋針對一組值驗證字符串.

I want to validate a string against a set of values using annotations.

我想要的基本上是這樣的:

What I want is basically this:

@ValidateString(enumClass=com.co.enum)
String dataType;

int maxValue;
int minValue;
int precision;

或

@ValidateString(values={"String","Boolean", "Integer"})
String dataType;

int maxValue;
int minValue;
int precision;

我還想根據(jù) dataType 中設(shè)置的值對其他變量進行一些驗證:

I also want to do some validation on other variables depending upon the value set in dataType:

if (dataType = "String") {
    // maxValue, minValue, precision all should be null or zero
}

我想不出通過自定義注釋來實現(xiàn)這一點的方法.
有人請幫幫我.

I can't think of a way to achieve this by custom annotations.
Somebody please help me.

推薦答案

這就是我所做的.

注釋

public @interface ValidateString {

    String[] acceptedValues();

    String message() default "{uk.dds.ideskos.validator.ValidateString.message}";

    Class<?>[] groups() default { };

    Class<? extends Payload>[] payload() default { }; 
}

驗證類

public class StringValidator implements ConstraintValidator<ValidateString, String>{

    private List<String> valueList;

    @Override
    public void initialize(ValidateString constraintAnnotation) {
        valueList = new ArrayList<String>();
        for(String val : constraintAnnotation.acceptedValues()) {
            valueList.add(val.toUpperCase());
        }
    }

    @Override
    public boolean isValid(String value, ConstraintValidatorContext context) {
        return valueList.contains(value.toUpperCase());
    }

}

我用它喜歡

@ValidateString(acceptedValues={"Integer", "String"}, message="Invalid dataType")
String dataType;

Long maxValue;
Long minValue;

現(xiàn)在我需要弄清楚如何實現(xiàn)條件檢查IE.如果是字符串，那么 maxValue 和 minValue 應(yīng)該為 null 或零..

Now I need to figure out how to implement conditional check ie. if String then maxValue and minValue should be null or Zero..

有什么想法嗎?

這篇關(guān)于使用枚舉值和注解的 Java 字符串驗證的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網(wǎng)！