SPRING IN ACTION 第4版笔记-第五章BUILDING SPRING WEB APPLICATIONS-007-表单验证@Valid、Error

一、

Starting with Spring 3.0, Spring supports the Java Validation API in Spring MVC . No extra configuration is required to make Java Validation work in Spring MVC . You just need to make sure an implementation of the Java API , such as Hibernate Validator, is in the project’s classpath.

1.

2.在实体类写约束

 public class Spitter {

   private Long id;

   @NotNull
   @Size(min=5, max=16)
   private String username;

   @NotNull
   @Size(min=5, max=25)
   private String password;

   @NotNull
   @Size(min=2, max=30)
   private String firstName;

   @NotNull
   @Size(min=2, max=30)
   private String lastName;

   @NotNull
   @Email
   private String email;

3.controller中

 @RequestMapping(value="/register", method=POST)
   public String processRegistration(
       @Valid Spitter spitter,
       Errors errors) {
     if (errors.hasErrors()) {
       return "registerForm";
     }