Parameter validation via hibernate-validation in Java

In the development of Java server-side code, we will encounter the external parameters of the validity of validation, and Hibernate-validator provides some common parameter check annotations, we can use.
The hibernate-validator corresponding jar is introduced in 1.maven:

<dependency>    <groupId>org.hibernate</groupId>    <artifactid>hibernate-validator </artifactId>    <version>4.3.1.Final</version> </dependency>

2. Define the field to validate in the model (that is, the field cannot be empty and the maximum length is 14):

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importjavax.validation.constraints.Pattern;import javax.validation.constraints.Size;importorg.hibernate.validator.constraints.NotEmpty;publicclassPayRequestDto {        /**     * 支付完成时间     **/    @NotEmpty(message="支付完成时间不能空")    @Size(max=14,message="支付完成时间长度不能超过{max}位")    privateString payTime;         /**     * 状态     **/    @Pattern(regexp = "0[0123]", message = "状态只能为00或01或02或03")    private String status;    publicString getPayTime() {        returnpayTime;    }    publicvoidsetPayTime(String payTime) {        this.payTime = payTime;    }    publicString getStatus() {        returnstatus;    }    publicvoidsetStatus(String status) {        this.status = status;    }}

3. Define the Validation tool class:

 Import Java.util.set;import Javax.validation.constraintviolation;import javax.validation.validation;import Javax.validation.validator;import Org.hibernate.validator.hibernatevalidator;import    Com.atai.framework.lang.appexception;public class Validationutils {/** * uses hibernate annotations for verification * */ private static Validator Validator = Validation. Byprovider (Hibernatevalidator.class). Configure (). FailFast (True    ). Buildvalidatorfactory (). Getvalidator ();     /** * Function Description: <br> *〈 Annotation Validation parameters 〉* * @param obj * @see [Related Classes/methods] (optional) * @since [Product/module version] (optional) */ public static <T> void validate (T obj) {set<constraintviolation<t>> constraintviolations = V        Alidator.validate (obj); Throw test Exception if (constraintviolations.size () > 0) {throw new Appexception ("0001", String.Format ("parameter check failed        :%s ", Constraintviolations.iterator (). Next (). GetMessage ())); }    }}

4. Call the tool class in the code to verify the parameters:

Validationutils.validate (requestdto);

The following is a description of some of the annotations in Hibernate-validator:

@AssertTrue	For Boolean fields, this field can be true only
@AssertFalse	The value of this field can only be false
@CreditCardNumber	Make 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=,fraction=)	Check whether it is a number of integers, fractions, digits of decimal digits
@Email	Check to see 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=)	Checks whether the length of the owning field is between Min and Max and can only be used 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 the value
@NotNull	Cannot be null
@NotBlank	cannot be empty, and whitespace is ignored when checking
@NotEmpty	Cannot be empty, here the null is the empty string
@Null	Check that the field is empty
@Past	The date that the field was checked is in the past
@Pattern (regex=,flag=)	The annotated element must conform to the specified regular expression
@Range (min=,max=,message=)	The annotated element must be within the appropriate range
@Size (min=, max=)	Checks whether 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	This annotation is used primarily for a field that contains a collection of other objects or a map or array, or a reference to a different object directly, so that the object referenced by the field is checked as well as the current object

Parameter validation via hibernate-validation in Java