Spring3 MVC的最佳实践和理解（8）

个人学习参考所用，勿喷！ 

 

8.Bean的注解式校验

为了使用JSR-303的注解式校验，首先必须要修饰一个Bean：

public class Member {

    // JSR-303 validation annotations
    @NotNull
    @Size(min=2)
    private String name;
    @NotNull
    @Size(min = 9, max = 14)
    private String phone;
    @Pattern(regexp=".+@.+\\.[a-z]+")
    private String email;
	
	...
}

 然后在控制器类中实施这些校验：

@Controller
@RequestMapping("/member/*")
@SessionAttributes("guests")
public class MemberController {
    // JSR-303 validator
    private static Validator validator;
    private MemberService memberService;

    @Autowired
    public MemberController(MemberService memberService) {
        this.memberService = memberService;

        // Initialize JSR-303 bean validation
        ValidatorFactory validatorFactory = Validation.buildDefaultValidatorFactory();
        validator = validatorFactory.getValidator();
    }

    ...

    @RequestMapping(method = RequestMethod.POST)
    public String submitForm(@ModelAttribute("member")
    Member member, BindingResult result, Model model) {
        // Get JSR-303 errors ( See domain Member class for annotations validation) 
        Set<ConstraintViolation<Member>> violations = validator.validate(member);

        for (ConstraintViolation<Member> violation : violations) {
            String propertyPath = violation.getPropertyPath().toString();
            String message = violation.getMessage();
            result.addError(new FieldError("member", propertyPath, "Invalid " + propertyPath + "(" + message + ")"));
        }

        if (!result.hasErrors()) {
            ...
        } else {
            ...
        }
    }
}

 在这里我们是手动的在构造器中完成了validator的初始化。其实也可以让Spring来注入，Spring的高级注入方式有工厂方式的注入。要使用上面的校验需要添加如下的jar支持：

<dependency>
	<groupId>javax.validation</groupId>
	<artifactId>validation-api</artifactId>
	<version>1.0.0.GA</version>
	<type>jar</type>
	<scope>compile</scope>
</dependency>
<dependency>
	<groupId>org.hibernate</groupId>
	<artifactId>hibernate-validator</artifactId>
	<version>4.3.0.Beta1</version>
	<type>jar</type>
	<scope>compile</scope>
</dependency>

 

 

参考：

juyon的blog:《spring3 MVC国际化支持之中文乱码》

Gary Mark等的书籍：《Spring Recipes》2ed