java-技术点

1.数据验证

  1.1 依赖引用

  org.springframework.boot
  spring-boot-starter-validation

  1.2 加@Valid注解

@RequestMapping(value = "/doLogin", method = RequestMethod.POST)
@ResponseBody
public RespBean doLogin(@Valid LoginVo loginVo) {
    return RespBean.success();
}

  1.3 LoginVo加注解

public class LoginVo {

    @NotNull
    @IsMobile
    private String mobile;

    @NotNull
    @Length(min = 32)
    private String password;

    @Override
    public String toString() {
        return "LoginVo{" +
                "mobile='" + mobile + '\'' +
                ", password='" + password + '\'' +
                '}';
    }

    public String getMobile() {
        return mobile;
    }

    public void setMobile(String mobile) {
        this.mobile = mobile;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }
}

  1.4 创建@IsMobile

    @Constraint自定义类

@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.METHOD, ElementType.FIELD, ElementType.ANNOTATION_TYPE, ElementType.CONSTRUCTOR, ElementType.PARAMETER, ElementType.TYPE_USE})
@Documented
@Constraint(validatedBy = {IsMobileValidator.class})
@Constraint(validatedBy = {IsMobileValidator.class})
public @interface IsMobile {

    boolean required() default true;

    String message() default "手机号码格式错误";

    Class[] groups() default {};

    Class[] payload() default {};

}

  1.5 创建IsMobileValidator

    ConstraintValidator

import com.example.seckill.utils.ValidatorUtil;
import org.thymeleaf.util.StringUtils;
import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;
 
public class IsMobileValidator implements ConstraintValidator {

    private boolean required = false;

    @Override
    public void initialize(IsMobile constraintAnnotation) {
        required = constraintAnnotation.required();
    }

    @Override
    public boolean isValid(String s, ConstraintValidatorContext constraintValidatorContext) {

        //必须填写
        if (this.required) {
            return ValidatorUtil.isMobile(s);
        } else {
            if (StringUtils.isEmpty(s)) {
                return true;
            } else {
                return ValidatorUtil.isMobile(s);
            }
        }

    }
}

  1.6 此时错误还不能返回页面，需要添加全局类

@RestControllerAdvice
public class GlobalExceptionHandler {

    @ExceptionHandler(Exception.class)
    public RespBean ExceptionHandler(Exception e) {
        if (e instanceof GlobalException) {
            GlobalException exception = (GlobalException) e;
            return RespBean.error(exception.getRespBeanEnum());
        } else if (e instanceof BindException) {
            BindException bindException = (BindException) e;
            RespBean respBean = RespBean.error(RespBeanEnum.BIND_ERROR);
            respBean.setMessage("参数校验异常：" + bindException.getBindingResult().getAllErrors().get(0).getDefaultMessage());
            return respBean;
        }
        System.out.println("异常信息" + e);
        return RespBean.error(RespBeanEnum.ERROR);
    }
}
public class GlobalException extends RuntimeException {

    private RespBeanEnum respBeanEnum;

    public RespBeanEnum getRespBeanEnum() {
        return respBeanEnum;
    }

    public void setRespBeanEnum(RespBeanEnum respBeanEnum) {
        this.respBeanEnum = respBeanEnum;
    }

    public GlobalException(RespBeanEnum respBeanEnum) {
        this.respBeanEnum = respBeanEnum;
    }
}

2.@EnableWebMvc静态资源无效

@Configuration
@EnableWebMvc
public class WebConfig implements WebMvcConfigurer {

    @Autowired
    private UserArgumentResolver userArgumentResolver;

    @Override
    public void addArgumentResolvers(List resolvers) {
        resolvers.add(userArgumentResolver);
    }

    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler("/**").addResourceLocations("classpath:/static/");
        //swagger 和 knife4j
        registry.addResourceHandler("swagger-ui.html").addResourceLocations("classpath:/META-INF/resources/");
        registry.addResourceHandler("doc.html").addResourceLocations("classpath:/META-INF/resources/");
        registry.addResourceHandler("/webjars/**").addResourceLocations("classpath:/META-INF/resources/webjars/");
    }

}

3.redis时间格式化jsr310

  not supported by default: add Module "com.fasterxml.jackson.datatype:jackson-datatype-jsr310"

private RedisSerializer