Spring MVC data validation

Spring MVC data validation

 

Spring3 began to support the JSR-303 validation framework, JSR-303 supports XML-style and annotation-style validation.

 

 

example

package cn.javass.chapter7.model;  
import javax.validation.constraints.NotNull;  
public class UserModel {  
    @NotNull(message="{username.not.empty}")  
    private String username;  
}   

 

 

 

The built-in validation constraint annotations are shown in the following table (taken from the hibernate validator reference):

Validate annotations	Validated data type	illustrate
@AssertFalse	Boolean,boolean	Validate that the element value of the annotation is false
@AssertTrue	Boolean,boolean	Verify that the element value of the annotation is true
@NotNull	any type	Verify that the element value of the annotation is not null
@Null	any type	Validate that the element value of the annotation is null
@Min(value=value)	BigDecimal，BigInteger, byte, short, int, long, etc. any Subtype of Number or CharSequence (which stores numbers)	Verify that the element value of the annotation is greater than or equal to the value specified by @Min
@Max(value=value)	Same as @Min asked	Verify that the element value of the annotation is less than or equal to the value specified by @Max
@DecimalMin(value=值)	Same as @Min asked	Verify that the element value of the annotation is greater than or equal to the value specified by @DecimalMin
@DecimalMax(value=值)	Same as @Min asked	Verify that the element value of the annotation is less than or equal to the value specified by @DecimalMax
@Digits(integer=integer digits, fraction=decimal digits)	Same as @Min asked	Validate the maximum number of integers and decimals for the element value of the annotation
@Size(min=lower limit, max=upper limit)	String, Collection, Map, Array, etc.	Verify that the element value of the annotation is within the specified interval of min and max (inclusive), such as character length, set size
@Past	java.util.Date, java.util.Calendar; Date type of the Joda Time library	Validate that the element value of the annotation (date type) is earlier than the current time
@Future	Same as @Past request	Verify that the element value of the annotation (date type) is later than the current time
@NotBlank	CharSequence subtype	Verify that the element value of the annotation is not empty (not null, the length is 0 after removing the first space), unlike @NotEmpty, @NotBlank only applies to strings and will remove the first space of the string when comparing
@Length(min=lower limit, max=upper limit)	CharSequence subtype	Verify that the length of the element value of the annotation is within the min and max intervals
@NotEmpty	CharSequence subtype, Collection, Map, Array	Verify that the element value of the annotation is not null and not empty (string length is not 0, collection size is not 0)
@Range(min=minimum, max=maximum)	Atomic types and wrapper types such as BigDecimal, BigInteger, CharSequence, byte, short, int, long	Verify that the element value of the annotation is between the minimum and maximum values
@Email(regexp=regular expression, flag=flag mode)	CharSequence subtype (eg String)	Verify that the element value of the annotation is Email, or you can specify a custom email format through regexp and flag
@Pattern(regexp=regular expression, flag=flag mode)	String, any subtype of CharSequence	Verify that the element value of the annotation matches the specified regular expression
@Valid	any non-atomic type	Specify the object to recursively verify the association; If there is an address object property in the user object, if you want to verify the address object together with the user object, add the @Valid annotation to the address object to cascade verification

 

Only most of the validation constraint annotations provided by Hibernate Validator are listed here. Please refer to the official documentation of hibernate validator for other validation constraint annotations and custom validation constraint annotation definitions.