Spring mvc adopts jsr303 bean validation framework

This is a specification that defines some elements for bean data validation. For example, your model has a user. java with an email in it. When a user registers, it needs to verify that the email is valid. The general approach is js front-end verification, but it is not secure. As a complete security solution, we must perform backend verification. Table 1. the built-in constraint Constraint details in Bean Validation @ Null the annotated element must be null @ NotNull the annotated element must not be null @ AssertTrue the annotated element must be true @ AssertFalse the annotated element must be false @ Min (value) the element to be commented must be a number and its value must be greater than or equal to the specified minimum value @ Max (value). The element to be commented must be a number, the value must be less than or equal to the specified maximum value @ DecimalMin (value) The annotated element must be a number and its value must be greater than or equal to the specified minimum value @ DecimalMax (value) the annotated element must be a number and its value must be less than or equal to the specified maximum value @ Size (max, min) the size of the element to be commented must be within the specified range @ Digits (integer, fraction) the element to be commented must be a number, The value must be within the acceptable range. @ Past the annotated element must be a previous date @ Future the annotated element must be a Future date @ Pattern (value) the annotated elements must comply with the specified Regular Expression hibernate implements and extends this specification; constraint details @ Email the annotated element must be the Email address @ Length the size of the annotated string must be within the specified Range @ NotEmpty the annotated string must be non-empty @ Range the annotated element must be within the appropriate range of 2, jsr303 implements Hibernate Validator, which is a reference implementation of Bean validation. hibernate Validator provides all built-in constraint implementations in the JSR 303 specification, in addition to some additional constraint. This verification framework can be used independently, even if your architecture is spring mvc + ibatis. The following figure shows the benefits: 3. How to Use jsr303 validation in spring mvc 1) First, configure <mvc: annotation-driven/> 2 in spring Based on the annotion annotation driver) related jar packages, if maven [html] <repositories> <repository> <id> JBoss repository </id> <url> http://repository.jboss.org/nexus/content/groups/public/ </url> </repository> </repositories> <properties> <spring. version> 3.0.5.RELEASE </spring. version> </properties> <dependencies> <! -- Spring 3 dependencies --> <dependency> <groupId> org. springframework </groupId> <artifactId> spring-core </artifactId> <version >$ {spring. version }</version> </dependency> <groupId> org. springframework </groupId> <artifactId> spring-web </artifactId> <version >$ {spring. version }</version> </dependency> <groupId> org. springframework </groupId> <artifactId> spring-webmvc </artifactId> <v Ersion >$ {spring. version }</version> </dependency> <! -- Hibernate Validator --> <dependency> <groupId> org. hibernate </groupId> <artifactId> hibernate-validator </artifactId> <version> 4.2.0.Final </version> </dependency> </dependencies> if it is not maven, come down hibernate-validator.jar to the project alone. 3) declare [java] @ NotEmpty (message = "name cannot be blank") private String name in model (some objects of data interaction, or vo; @ NotEmpty (message = "email cannot be blank") @ Email (message = "invalid email format") private String email; [java] 4) use @ valid and BindingResult in the controller: [java] view plaincopy <span style = "font-size: 18px;"> @ RequestMapping (value = "/test ") @ ResponseBody private User test (@ Valid User u, BindingResultresult) {if (result. hasErrors () {// This is spring va Result object returned after lidation verification // What do you want to do if verification fails? String code = result. getFieldError (). getCode (); // The type name of the verification error, such as NotEmpty result. getFieldError (). getdefamessage message (); // return m;} else {return null ;}</span> 5) if an error is displayed on the page, you can either use the el expression to obtain the model value or use the spring form label: <form: errors path = "*" cssClass = "errorblock" element = "div"/>, I am using spring mvc + mybatis. hibernate validation is an independent component and has little to do with orm. Ibatis is not implemented in the validation specification.