Use of validate in Hibernate

Original link: http://blog.csdn.net/xing_sky/article/details/8484551

The first is to add the following two packages

Hibernate-validator-4.1.0.final.jar
Validation-api-1.0.0.ga.jar

An Javax.validation.ConstraintViolationException exception is thrown if an add, update, or delete operation is made when the validation is not passed

Here is the class for testing

Model2:

Java code

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= "name cannot be empty! " )

Public String GetName () {

return name;

}

public void SetName (String name) {

this. Name = name;

}

@NotNull (message= "address cannot be empty!) " )

Public String getaddress () {

return address;

}

public void setaddress (String address) {

this. Address = address;

}

@Size (max= One, min= one, message= "can only be 11 bits long! " )

Public String Getphonenumber () {

return phonenumber;

}

public void Setphonenumber (String phonenumber) {

this. PhoneNumber = PhoneNumber;

}

@Email (message= "Email address is invalid! " )

@NotNull (message= "email address cannot be empty! " )

Public String Getemail () {

return email;

}

public void Setemail (String email) {

this. email = email;

}

@NotNull (message = "MODEL3 cannot be empty!") " )

@Valid

@ManyToOne

Public Model3 GetModel3 () {

return model3;

}

public void SetModel3 (Model3 model3) {

this. Model3 = Model3;

}

@Min (value=, message= "must be over 18 years old! " )

@Max (value=, message= "age cannot be more than 30 years old! " )

public int getage () {

return age;

}

public void Setage (int.) {

this. Age = age;

}

@URL (message= "Invalid URL address")

@NotNull (message = "URL cannot be empty! " )

Public String GetUrl () {

return URL;

}

public void SetUrl (String URL) {

this. url = URL;

}

}

Model3:

Java code

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;

}

The name of the @NotNull (message= "MODEL3 cannot be empty! " )

Public String GetName () {

return name;

}

public void SetName (String name) {

this. Name = name;

}

}

Test class:

Java code

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 ("Changsha, Hunan");

Model.setphonenumber ("15012345678");

string result = Util.validatemodel (model);//Returns the validation result, the validation result is a string, if there is an error, the length of the string is greater than 0

SYSTEM.OUT.PRINTLN (result);

if (result.length () = = 0)//verification does not add when not passed

Service.add (model);

}

}

The Util class used above:

Java code

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) {//Validates an object

StringBuffer buffer = new StringBuffer (64); Used to store the error message after validation

Validator Validator = Validation.builddefaultvalidatorfactory ()

. Getvalidator ();

set<constraintviolation<object>> constraintviolations = Validator

. validate (obj);//Validation of an object, in fact, you can only verify that one of the properties of the

iterator<constraintviolation<object>> iter = constraintviolations

. iterator ();

while (Iter.hasnext ()) {

String message = Iter.next (). GetMessage ();

Buffer.append (message);

}

return buffer.tostring ();

}

}

Here are some of the main annotations:

Java code

@AssertTrue//For Boolean fields, this field can only be true

@AssertFalse//The value of this field can only be false

@CreditCardNumber//A rough verification of the credit card number

@DecimalMax//can only be less than or equal to this value

@DecimalMin//can only be greater than or equal to this value

@Digits (integer= 2, fraction= 20)//Check whether the number is a number of integers, fractions, and decimal digits.

@Email//Check if it is a valid Email address

@Future//Check if the date of the field is a date that belongs to the future

@Length (min=,max=)//Check whether the length of the field to which it belongs is between Min and Max, only for strings

@Max//The value of the field can only be less than or equal to the value

@Min//The value of the field can only be greater than or equal to this value

@NotNull//cannot be null

@NotBlank//cannot be empty, and whitespace is ignored when checking

@NotEmpty//cannot be empty, where null is the empty string

@Null//Check that the field is empty

@Past//Check the date of the field is in the past

@Size (min=, max=)//Check if the Size of the field is between Min and Max, which can be a string, array, collection, map, and so on

@URL (protocol=,host,port)//Check if it is a valid URL, and if Protocol,host is provided, the URL must also meet the conditions provided

@Valid//The annotation is used whenever the field is a field that contains a collection of other objects or a map or array, or if the field is a reference directly to a different object.

This will also check the object referenced by the field while checking the current object

Use of validate in Hibernate (RPM)