Spring Bean校验器设计

Bean:

 

package Bean.Validator;

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

 配置文件：主要配置资源文件

 

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">

<beans>

<bean id="messageSource" class="org.springframework.context.support.ResourceBundleMessageSource">
  <property name="basenames">
    <list>
      <value>ApplicationResources</value>
    </list>
  </property>
</bean>
 
</beans>

校验器：

 

package Bean.Validator;

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

public class PersonValidator implements Validator ...{

    public boolean supports(Class arg0) ...{
        
        return Person.class.equals(arg0);
    }

    public void validate(Object obj, Errors e) ...{
        //拒绝name属性为空
        ValidationUtils.rejectIfEmpty(e, "name", "name.empty");
        Person p=(Person)obj;
        if(p.getAge()<0)...{
            e.rejectValue("age", "negativevalue");
        }else if(p.getAge()>100)...{
            e.rejectValue("age","tooold");
        }

    }

}

 

测试代码：

getMessage()需要一个数据作为参数，此处可以设置一个空数组即可

package Bean.Validator;

import java.util.List;
import java.util.Locale;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.FileSystemXmlApplicationContext;
import org.springframework.validation.BindException;
import org.springframework.validation.Errors;
import org.springframework.validation.ObjectError;
import org.springframework.validation.Validator;

public class Test ...{

    /** *//**
     * @param args
     */
    public static void main(String[] args) ...{
          String path=new Test().getClass().getResource("/").getPath();
            String realpath=path.substring(1, path.length());
            ApplicationContext context=new FileSystemXmlApplicationContext(realpath+"/validator.xml");
        Person p=new Person();
        p.setName(null);
        p.setAge(200);
        Errors errors=new BindException(p,"person");
        //创建校验器
        Validator personValidator=new PersonValidator();
        //校验
        personValidator.validate(p, errors);
        //打印错误数量
        System.out.println(errors.getErrorCount());
        List errorList=errors.getAllErrors();
        for(int i=0;i<errorList.size();i++)...{
            ObjectError oe=(ObjectError)errorList.get(i);
            Object b[]=...{};
            System.out.println(context.getMessage(oe.getCode(), b,Locale.getDefault()));
        }

    }

}

运行结果：

2
Person实例的name属性不能为空
Person实例的age不能大于100