问题描述
我创建了一个自定义验证器来验证字符串。它适用于单个字符串,但不适用于字符串列表。这是我迄今为止尝试过的:
@Get("/test1")
public String test1(
@QueryValue(value = "ids") List<@DurationPattern String> ids) { //NOT WORKING
return "not working";
}
@Get("/test2")
public String test2(
@QueryValue(value = "id") @DurationPattern String id){ //WORKS
//it does not get here which is what I want.
return "done";
}
我的 @DurationPattern
代码:
package my.package;
import javax.validation.Constraint;
import java.lang.annotation.Documented;
import java.lang.annotation.Repeatable;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;
import static java.lang.annotation.ElementType.*;
import my.package.DurationPattern.List;
@Target({ METHOD,FIELD,ANNOTATION_TYPE,CONSTRUCTOR,ParaMETER,TYPE_USE,TYPE,LOCAL_VARIABLE,PACKAGE,TYPE_ParaMETER,MODULE })
@Repeatable(List.class)
@Retention(RUNTIME)
@Documented
@Constraint(validatedBy = { })
public @interface DurationPattern {
String message() default "invalid duration ({validatedValue})";
@Target({ METHOD,MODULE})
@Retention(RUNTIME)
@Documented
public @interface List {
DurationPattern[] value();
}
}
实际验证者:
package my.package;
import io.micronaut.context.annotation.Factory;
import io.micronaut.validation.validator.constraints.ConstraintValidator;
import javax.inject.Singleton;
@Factory
public class MyValidatorFactory {
@Singleton
ConstraintValidator<DurationPattern,CharSequence> durationPatternValidator() {
return (value,annotationMetadata,context) -> {
System.out.println("Please Print!!! It doesn't for Strings within List");
return value == null || value.toString().matches("^PT?[\\d]+[SMHD]{1}$");
};
}
}
解决方法
基本上,创建 io.micronaut.validation.validator.constraints.ConstraintValidator
的实现并在 @Constraint(validatedBy = { })
中提供它们
@Target({METHOD,FIELD,ANNOTATION_TYPE,CONSTRUCTOR,PARAMETER,TYPE_USE})
@Repeatable(Regexp.List.class)
@Retention(RUNTIME)
@Documented
@Constraint(validatedBy = {DurationPatternValidator.class,DurationPatternValidatorList.class}) //to validate a single string or a list of strings
public @interface DurationPattern {
...
}
@Singleton
public class RegexValidatorList implements ConstraintValidator<DurationPattern,Collection<CharSequence>> {
@Override
public boolean isValid(...) {
....
}
然后在控制器的处理程序方法中您将使用
@Get("/test1")
public String test1(
@QueryValue(value = "ids") @DurationPattern List<String> ids) { //@DurationPattern would appear outside of diamond brackets for it to work.
return "working now";
}