spring的jsr 303小例子

用于验证传进来的参数

1.User类

public class User implements Serializable {

@NotNull(message="名字不能为空")

private StringuserName;

private Stringemail;

public String getUserName() {

returnuserName;

}

publicvoid setUserName(StringuserName) {

this.userName =userName ==null ?null :userName.trim();

}

public String getEmail() {

returnemail;

}

publicvoid setEmail(Stringemail) {

this.email =email ==null ?null :email.trim();

}

}

2.Controller

@Controller

@RequestMapping(value = "/hello")

public class TestController {

    

  @RequestMapping(value = "/index", method = RequestMethod.GET)

  @ResponseBody

  public  String test(@Valid  Useruser){

  return"test";

  }

}

3.统一处理controller的异常类

@ControllerAdvice

public class ControllerValidationHandler {

    @ExceptionHandler(BindException.class)

    @ResponseBody

    public void processValidationError(BindExceptionex) {

BindingResult result =ex.getBindingResult();

        FieldError error = result.getFieldError();

        List<ObjectError> errors = result.getAllErrors();

        for (ObjectError objectError : errors) {

            LOG.error("code:{},message:{}", objectError.getCode(), objectError.getDefaultMessage());

        }

    }

}

4.配置依赖

<dependency>  

      <groupId>org.hibernate</groupId>  

      <artifactId>hibernate-validator</artifactId>  

      <version>5.2.1.Final</version>  

</dependency>

5.前端测试

6.总结

一旦前端对应的user的userName为空，那么这个验证框架就会在controller层抛出异常，而@ControllerAdvice注解的类会对这个异常统一进行处理，然后我们可以自己选择如何处理，再返回给前端