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
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
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 @ManyToOne public 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 @GeneratedValue public 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; } }
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("[email protected]"); 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0 System.out.println(result); if (result.length() == 0)// 验证不通过的时候就不添加 service.add(model); } }
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(); } }
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