Hibernate-Validation的运用

Hibernate-Validation的使用

以前弄过hibernate-validation的，可今天想用一下的时候发现某些东西自己又忘了，于是又重新整理了下，并做了点实验：

首先是要加入下面两个包

hibernate-validator-4.1.0.Final.jar
?validation-api-1.0.0.GA.jar

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如果在验证不通过的时候进行了添加、更新或删除操作的时候，则会抛出javax.validation.ConstraintViolationException异常

下面是测试用的类

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Model2：

import javax.persistence.Entity;import javax.persistence.GeneratedValue;import javax.persistence.GenerationType;import javax.persistence.Id;import javax.persistence.ManyToOne;import javax.persistence.Table;import javax.persistence.TableGenerator;import javax.validation.Valid;import javax.validation.constraints.Max;import javax.validation.constraints.Min;import javax.validation.constraints.NotNull;import javax.validation.constraints.Size;import org.hibernate.validator.constraints.Email;import org.hibernate.validator.constraints.URL;@Entity@Table(name="t_Model2")@TableGenerator(name="mytable",initialValue=1,allocationSize=1)public class Model2 {private int id;private String name;private String address;private String phoneNumber;private String email;private int age;private Model3 model3;private String url;@Id@GeneratedValue(generator="mytable",strategy=GenerationType.TABLE)public int getId() {return id;}public void setId(int id) {this.id = id;}@NotNull(message="姓名不能为空！")public String getName() {return name;}public void setName(String name) {this.name = name;}@NotNull(message="地址不能为空！")public String getAddress() {return address;}public void setAddress(String address) {this.address = address;}@Size(max=11,min=11,message="长度只能为11位！")public String getPhoneNumber() {return phoneNumber;}public void setPhoneNumber(String phoneNumber) {this.phoneNumber = phoneNumber;}@Email(message="email地址无效！")@NotNull(message="email地址不能为空！")public String getEmail() {return email;}public void setEmail(String email) {this.email = email;}@NotNull(message = "Model3不能为空！")@Valid@ManyToOnepublic Model3 getModel3() {return model3;}public void setModel3(Model3 model3) {this.model3 = model3;}@Min(value=18,message="必须年满18岁！")@Max(value=30,message="年龄不能大于30岁！")public int getAge() {return age;}public void setAge(int age) {this.age = age;}@URL(message="无效的URL地址")@NotNull(message = "URL不能为空！")public String getUrl() {return url;}public void setUrl(String url) {this.url = url;}}

?Model3：

import javax.persistence.Entity;import javax.persistence.GeneratedValue;import javax.persistence.Id;import javax.persistence.Table;import javax.validation.constraints.NotNull;@Entity@Table(name="t_Model3")public class Model3 {private int id;private String name;@Id@GeneratedValuepublic int getId() {return id;}public void setId(int id) {this.id = id;}@NotNull(message="model3的名称不能为空！")public String getName() {return name;}public void setName(String name) {this.name = name;}}

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Test类：

import org.springframework.context.ApplicationContext;import com.tiantian.test.model.Model2;import com.tiantian.test.service.Model2Service;import com.tiantian.test20110430.util.Util;public class Test1 {public static void main(String args[]) {ApplicationContext context = Util.getContext();Model2Service service = context.getBean(Model2Service.class);Model2 model = new Model2();model.setName("hello");model.setEmail("testHibernateValidate@sohu.com");model.setAddress("湖南长沙");model.setPhoneNumber("15012345678");String result = Util.validateModel(model);// 返回的验证结果，验证结果就是一个字符串，如果有错误的话则该字符串的长度大于0System.out.println(result);if (result.length() == 0)// 验证不通过的时候就不添加service.add(model);}}

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?上面用到的Util类：

import java.util.Iterator;import java.util.Set;import javax.validation.ConstraintViolation;import javax.validation.Validation;import javax.validation.Validator;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;public class Util {private static ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");public static ApplicationContext getContext() {return context;}public static String validateModel(Object obj) {//验证某一个对象StringBuffer buffer = new StringBuffer(64);//用于存储验证后的错误信息Validator validator = Validation.buildDefaultValidatorFactory().getValidator();Set<ConstraintViolation<Object>> constraintViolations = validator.validate(obj);//验证某个对象,，其实也可以只验证其中的某一个属性的Iterator<ConstraintViolation<Object>> iter = constraintViolations.iterator();while (iter.hasNext()) {String message = iter.next().getMessage();buffer.append(message);}return buffer.toString();}}

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下面是一些主要的注解：

@AssertTrue //用于boolean字段，该字段只能为true@AssertFalse//该字段的值只能为false@CreditCardNumber//对信用卡号进行一个大致的验证@DecimalMax//只能小于或等于该值@DecimalMin//只能大于或等于该值@Digits(integer=2,fraction=20)//检查是否是一种数字的整数、分数,小数位数的数字。@Email//检查是否是一个有效的email地址@Future//检查该字段的日期是否是属于将来的日期@Length(min=,max=)//检查所属的字段的长度是否在min和max之间,只能用于字符串@Max//该字段的值只能小于或等于该值@Min//该字段的值只能大于或等于该值@NotNull//不能为null@NotBlank//不能为空，检查时会将空格忽略@NotEmpty//不能为空，这里的空是指空字符串@Null//检查该字段为空@Past//检查该字段的日期是在过去@Size(min=, max=)//检查该字段的size是否在min和max之间，可以是字符串、数组、集合、Map等@URL(protocol=,host,port)//检查是否是一个有效的URL，如果提供了protocol，host等，则该URL还需满足提供的条件@Valid//该注解只要用于字段为一个包含其他对象的集合或map或数组的字段，或该字段直接为一个其他对象的引用，//这样在检查当前对象的同时也会检查该字段所引用的对象

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