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";
    }