studentvalidator.java

velocity的一个例子

package com.vc.validator;

import org.springframework.validation.Errors;
import org.springframework.validation.Validator;

import com.vc.maps.Student;

public class StudentValidator implements Validator{

	public boolean supports(Class aClass) {
		return aClass.equals(Student.class);
	}

	public void validate(Object obj, Errors errors) {
		Student student = (Student)obj;
		
		if(null == student){
			errors.rejectValue("message", "error", null, "Please input the student's information!");
		}
		
		if(null == student.getUsername() || student.getUsername().length() <= 0){
			errors.rejectValue("username", "error", null, "username must be required!");
		}
		
		if(null == student.getPassword() || student.getPassword().length() <= 0){
			errors.rejectValue("password", "error", null, "password must be required!");
		}
		
		if(student.getAge() == 0 ){
			errors.rejectValue("age", "error", null, "age must be required!");
		}
		
	}

}