详解SpringMVC验证框架Validation特殊用法

public class UserModel { 
 
  @NotNull(message = "{id.empty}", groups = { First.class }) 
  private int id; 
 
  @NotNull(message = "{username.empty}", groups = { First.class, Second.class }) 
  private String username; 
 
  @NotNull(message = "{content.empty}", groups = { First.class, Second.class }) 
  private String content; 
 
  public int getId() { 
    return id; 
  } 
 
  public void setId(int id) { 
    this.id = id; 
  } 
 
  public String getUsername() { 
    return username; 
  } 
 
  public void setUsername(String username) { 
    this.username = username; 
  } 
 
  public String getContent() { 
    return content; 
  } 
 
  public void setContent(String content) { 
    this.content = content; 
  } 
} 
public interface First { 
} 
 
public interface Second { 
} 

@RequestMapping(value = "/save.action", method = RequestMethod.POST) 
public String save(@Validated( { Second.class }) UserModel userModel, BindingResult result) { 
  if (result.hasErrors()) { 
    return "validate/error"; 
  } 
  return "redirect:/success"; 
} 
 
@RequestMapping(value = "/update.action", method = RequestMethod.POST) 
public String update(@Validated( { First.class, Second.class }) UserModel user, BindingResult result) { 
  if (result.hasErrors()) { 
    return "validate/error"; 
  } 
  return "redirect:/success"; 
} 

public interface GroupA { 
} 
 
public interface GroupB { 
} 
 
@GroupSequence( { Default.class, GroupA.class, GroupB.class }) 
public interface Group { 
} 
 
public class User { 
  @NotEmpty(message = "firstname may be empty") 
  private String firstname; 
 
  @NotEmpty(message = "middlename may be empty", groups = Default.class) 
  private String middlename; 
 
  @NotEmpty(message = "lastname may be empty", groups = GroupA.class) 
  private String lastname; 
 
  @NotEmpty(message = "country may be empty", groups = GroupB.class) 
  private String country; 
} 
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@RequestMapping(value = "/update.action", method = RequestMethod.POST) 
public String register(@Validated(Group.class) User user, BindingResult result) { 
  if (result.hasErrors()) { 
    return "validate/error"; 
  } 
  return "redirect:/success"; 
} 

@RequestMapping("/validate/multi") 
public String multi(@Valid @ModelAttribute("a") A a, BindingResult aErrors, @Valid @ModelAttribute("b") B b, BindingResult bErrors) { 
 
  if (aErrors.hasErrors()) { //如果a模型对象验证失败 
    return "validate/error"; 
  } 
  if (bErrors.hasErrors()) { //如果a模型对象验证失败 
    return "validate/error"; 
  } 
  return "redirect:/success"; 
} 

@Test 
public void testValidate() { 
  AnnotationDescriptor<EqualsAny> descriptor = new AnnotationDescriptor<EqualsAny>(EqualsAny.class); 
  EqualsAny equalsAny = AnnotationFactory.create(descriptor); 
  EqualsAnyValidator equalsAnyValidator = new EqualsAnyValidator(); 
  equalsAnyValidator.initialize(equalsAny); 
  Assert.assertTrue(equalsAnyValidator.isValid("123", null)); 
}