spring的Validator接口用法

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spring的Validator接口用于实体bean的验证，同时把验证结果存放在Errors里。

1。

package com.beans;

public class Person {

private String name;
private int age;
public String getName() {
  return name;
}
public void setName(String name) {
  this.name = name;
}
public int getAge() {
  return age;
}
public void setAge(int age) {
  this.age = age;
}
}

2。

package com.beans;

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

public class PersonValidator implements Validator {

public boolean supports(Class clazz) {
        return Person.class.equals(clazz);
    }

    public void validate(Object obj, Errors e) {
        ValidationUtils.rejectIfEmpty(e, "name", "name.empty");
        Person p = (Person) obj;
        if (p.getAge() <= 0) {
            e.rejectValue("age", "age is wrong");
        } else if (p.getAge() > 110) {
            e.rejectValue("age", "too.darn.old");
        }
    }

}

3。测试如下：

public class ValidateTest {
public static void main(String[] args){
  Person photo = new Person();
  Validator validator = new PersonValidator();
  Errors errors = new BindException(photo, "photo");
  boolean isSupport = validator.supports(Person.class);
  validator.validate(photo, errors);
  List<ObjectError> allErrors = errors.getAllErrors();
  System.out.println(allErrors.size());
  System.out.println(allErrors.get(1).getCode());
}
}

4。在spring mvc时候，用@Valid表示实体参数进行验证，再用@isEmpty等对实体的属性验证等等。