hibernate_validator_01

1.环境准备(Maven工程)

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.wy</groupId>
    <artifactId>validator_1</artifactId>
    <version>1.0-SNAPSHOT</version>
    <dependencies>
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-validator</artifactId>
            <version>4.3.2.Final</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/junit/junit -->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>

    </dependencies>

</project>

2.准备po类

package po;

import javax.validation.constraints.Min;
import javax.validation.constraints.NotNull;
import javax.validation.constraints.Size;

/**
 * Created by Administrator on 2016/7/12.
 */
public class Car {
    @NotNull
    private String manufacturer;
    @NotNull
    @Size(min = 2, max = 14)
    private String licensePlate;
    @Min(2)
    private int seatCount;
    public Car(String manufacturer, String licencePlate, int seatCount) {
        this.manufacturer = manufacturer;
        this.licensePlate = licencePlate;
        this.seatCount = seatCount;
    }
}

3.验证测试

package test;

import org.junit.BeforeClass;
import org.junit.Test;
import po.Car;

import javax.validation.ConstraintViolation;
import javax.validation.Validation;
import javax.validation.Validator;
import javax.validation.ValidatorFactory;
import java.util.Set;

/**
 * Created by Administrator on 2016/7/12.
 */
public class CarTest {
    private static Validator validator;
    /*获取验证器*/
    @BeforeClass
    public static void setUp() {
        ValidatorFactory factory = Validation.buildDefaultValidatorFactory();
        validator = factory.getValidator();
    }
    @Test
    public void test1() {
        Car car = new Car(null, "DD-AB-123", 4);
        //validate() 方法会返回一个set的 ConstraintViolation 的实例的集合, 我们可以通过遍历它来查看哪些验证错误
        Set<ConstraintViolation<Car>> constraintViolations = validator.validate(car);
        System.out.println(constraintViolations.size());
        System.out.println(constraintViolations);
        //[ConstraintViolationImpl{interpolatedMessage='不能为null', propertyPath=manufacturer, rootBeanClass=class po.Car, messageTemplate='{javax.validation.constraints.NotNull.message}'}]
    }
    @Test
    public void licensePlateTooShort() {
        Car car = new Car("Morris", "D", 4);
        Set<ConstraintViolation<Car>> constraintViolations =
                validator.validate(car);
        System.out.println(constraintViolations.size());
        System.out.println(constraintViolations);
        //[ConstraintViolationImpl{interpolatedMessage='个数必须在2和14之间', propertyPath=licensePlate, rootBeanClass=class po.Car, messageTemplate='{javax.validation.constraints.Size.message}'}]
    }
    @Test
    public void seatCountTooLow() {
        Car car = new Car("Morris", "DD-AB-123", 1);
        Set<ConstraintViolation<Car>> constraintViolations =
                validator.validate(car);
        System.out.println(constraintViolations.size());
        System.out.println(constraintViolations);
        //[ConstraintViolationImpl{interpolatedMessage='最小不能小于2', propertyPath=seatCount, rootBeanClass=class po.Car, messageTemplate='{javax.validation.constraints.Min.message}'}]
    }
    @Test
    public void carIsValid() {
        Car car = new Car("Morris", "DD-AB-123", 2);
        Set<ConstraintViolation<Car>> constraintViolations =
                validator.validate(car);
        System.out.println(constraintViolations.size());
        System.out.println(constraintViolations);
        //此时为一切正常
    }
}