原文链接：http://blog.csdn.net/xing_sky/article/details/8484551
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：
Java代码
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：
Java代码
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：
Java代码
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：
Java代码
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：
Java代码
@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