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Let s now look at NameValidator, where some real validation is performed. Listing 8-24 shows the NameValidator class. Listing 8-24. NameValidator package com.apress.springbook.chapter08.web; import org.springframework.validation.Validator; import org.springframework.validation.Errors; import com.apress.springbook.chapter08.domain.Name; import static com.apress.springbook.chapter08.web.ValidationUtils.rejectIfEmpty; import static com.apress.springbook.chapter08.web.ValidationUtils. rejectIfLengthGreaterThan; public class NameValidator implements Validator { public boolean supports(Class clazz) { return Name.class.isAssignableFrom(clazz); } public void validate(Object obj, Errors errors) { if (rejectIfEmpty("first", errors)) { rejectIfLengthGreaterThan (255, "first", errors); }
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CHAPTER 8 SPRING MVC
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if (rejectIfEmpty("last", errors)) { rejectIfLengthGreaterThan(255, "last", errors); } rejectIfLengthGreaterThan(255, "middle", errors); } } The nice thing about NameValidator is that it is decoupled from any other validator or object; it is focused on validating Name objects only. Designing validators like this keeps your validation system flexible. Now, how is validation performed The actual logic for validation is found inside the ValidationUtils object, which is filled with useful, small validation routines. These routines are built to work with any property from any class.
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Spring MVC ships with a very limited set of built-in validation routines. It is up to you to write more specific validation routines.
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The ValidationUtils Class
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Because Spring MVC does not ship with many validation routines, we will create a base set for this sample application. The routines themselves are imported into a validator through JDK 5 s static import feature. Using the new language feature helps to keep the code clutter to a minimum. All the routines work approximately the same way. They require the errors object, as it contains the object being validated plus any errors that have occurred. The routine also needs to know the name of the field to validate. To keep the routines flexible, we chose to reference the field names through Strings. The downside to this is that your IDE s refactoring tool won t recognize these field names if you attempt to rename a field. You can fix this by using anonymous inner classes that return the field value to be validated, with the cost of added lines of code. Any other specific validation routine parameters are included, such as maximum or minimum field lengths. And what happens if there is an error Let s look at ValidationUtils.rejectIfEmpty(), in Listing 8-25. Listing 8-25. rejectIfEmpty() Validation Routine public static boolean rejectIfEmpty(String field, Errors errors) { Object value = errors.getFieldValue(field); if (!StringUtils.hasLength(value.toString())) { errors.rejectValue(field, MSG_REQUIRED, new Object[]{ msr(field,errors)}, "Field " + field + " is required"); return false; } return true; }
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ValidationUtils is a class written specifically for the sample application. You can download it with the rest of the source code from the book s website. It also includes the msr() method, which we ll show later in Listing 8-28.
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CHAPTER 8 SPRING MVC
The actual check, using org.springframework.util.StringUtils.hasLength(String), is straightforward in its intent. However, direct your attention to errors.rejectValue(), which has the signature rejectValue(String field, String errorCode, Object[] errorArgs, String defaultMessage). The arguments are as follows: field: The name of the field that failed the validation. errorCode: The error message name, such as errors.required, which is turned into a full String when rendered on the UI. errorArgs: Arguments to the error message, for instance, the name of the field. defaultMessage: If a valid translation of the errorCode can t be found, the defaultMessage is displayed. The errors and error messages rely on the Spring Framework s ability to perform i18n tasks such as translations. This is why rejectValue() requires an errorCode, such as errors.required, instead of a full error message such as The field is required. Requiring translation of error messages is useful for two reasons: It forces you to centralize the error messages into a single file (which you ll see very shortly). This has an added benefit of enforcing reuse of error messages. It natively handles i18n when you need to provide multiple language support. You might not need it immediately, but you ll be happy it s there when you do. So where does the errorArgs parameter come into play To answer that, let s look at the error messages themselves. Listing 8-26 shows the messages_en.properties file, which contains the English translations for the error messages and supporting messages. Listing 8-26. The messages_en.properties File errors.required={0} is required. errors.too-long={0} must not be longer than {1} characters. errors.value-between={0} must be between {1} and {2}. name.first=First Name name.middle=Middle Name name.last=Last Name areaCode=Area Code number=Phone Number address.line1=Line 1 address.line2=Line 2 address.city=City address.state=State/Province address.zip=Zip/Postal Code This file is specified inside an ApplicationContext as a ResourceBundleMessageSource instance. We ve declared the bean inside the spring-servlet.xml file, as it contains messages specific to the web application. Listing 8-27 shows the bean definition that uses this messages file. Listing 8-27. messageSource Bean Definition in spring-servlet.xml <bean id="messageSource" class="org.springframework.context.support. ReloadableResourceBundleMessageSource">
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