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How to use Validator interface for data validation |
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Spring's org.springframework.validation.Validator interface is used to validate objects. The Validator interface is very simple and works with Errors object.
Following two methods are provided by the Validator interface.
supports(Class) - indicates whether or not this validator supports the given object.
validate(Object, org.springframework.validation.Errors) - validates the given object and in case of validation errors, put those in the given Errors object.
Example:
This example will show the implementation of Validator interface.
Consider the following Company class.
Company.java
public class Company {
private String name;
private int strength;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getStrength() {
return strength;
}
public void setStrength(int strength) {
this.strength = strength;
}
}
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Following class CompanyValidator.java is the Validator for the Company.java class. It will validate the value of strength field from 0 to 100000.
CompanyValidator.java
public class CompanyValidator implements Validator {
public boolean supports(Class clazz) {
return Company.class.equals(clazz);
}
}
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