springboot(1)

一。标签

@PathVariable：获取url中的参数 例如：http://localhost:8090/girl/say/1 

@RequestMapping(value="/say/{id}", method=RequestMethod.GET)
    public String say(@PathVariable(value = "id") Integer id) {
        return "id:"+id;
    }

@RequestParam: 获取http://localhost:8090/girl/say?id=1

@Value : 读取application.yml中的配置项

@ConfigurationProperties：从application.yml中的配置项封装到类

@Component
@ConfigurationProperties(prefix = "girl")
public class Girl {
    private String cupSize;
    private String age;
    public String getCupSize() {
        return cupSize;
    }
    public void setCupSize(String cupSize) {
        this.cupSize = cupSize;
    }
    public String getAge() {
        return age;
    }
    public void setAge(String age) {
        this.age = age;
    }
}

girl:
  cupSize: F
  age: 20

 二。AOP拦截器

@Aspect，@Before，@After，@AfterReturning

@Aspect
@Component
public class HttpAspect {
    Logger log = LoggerFactory.getLogger(this.getClass());
    
    @Pointcut("execution(public * com.yjm.test1.controller.GirlController.*(..))")
    public void log() {
        
    }
    @Before("log()")
    public void beforeLog(JoinPoint joinPoint) {
        ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
        HttpServletRequest request = attributes.getRequest();
        // url 
        log.info("url={}", request.getRequestURL());
        //method
        log.info("method={}", request.getMethod());
        //ip
        log.info("ip={}", request.getRemoteAddr());
        //class
        log.info("class={}", joinPoint.getClass()+"."+joinPoint.getSignature().getDeclaringTypeName());
        //参数
        log.info("args={}", joinPoint.getArgs());
        
        log.info("beforeLog !!!");
    }
    
    @After("log()")
    public void afterLog() {
        log.info("afterLog !!!");
    }
    @AfterReturning(returning = "object", pointcut = "log()")
    public void returnLog(Object object) {
        log.info("return={}", object.toString());
    }

三。表单校验

@Valid

首先实体类中使用@Size，@Max,@Min等条件约束

@Size(min = 1,max = 1)
private String cupSize;

再在control层 用@Valid和BindingResult 来校验并获取错误信息

@RequestMapping(value = "/girls", method = RequestMethod.POST)
    public Result addOne(@Valid Girl girl, BindingResult bindingResult){
        if(bindingResult.hasErrors()) {
            logger.error(bindingResult.getFieldError().getDefaultMessage());
            return ResultUtil.error(1, bindingResult.getFieldError().getDefaultMessage());
        }
        return ResultUtil.success(girlRespository.save(girl));
    }

四。统一异常处理

1.自定义异常

public class GirlException extends RuntimeException {
    private Integer code;
    public GirlException(Integer code, String msg) {
        super(msg);
        this.code = code;
    }
    public Integer getCode() {
        return code;
    }
    public void setCode(Integer code) {
        this.code = code;
    }
}

2.定义异常处理类

@ControllerAdvice
public class ExceptionHandle {
    Logger logger = LoggerFactory.getLogger(this.getClass());
    
    @ExceptionHandler(Exception.class)
    @ResponseBody
    public Result handle(Exception e) {
        if(e instanceof GirlException) {
            return ResultUtil.error(((GirlException) e).getCode(),e.getMessage());
        } else {
            logger.error("未知错误", e);
            return ResultUtil.error(-1, "未知错误");
        }
    }
}

@ControllerAdvice：controller增强处理
抛出异常都会先走这里

五。返回json中忽略null
5.1全局配置

sping:
  jackson:
    default-property-inclusion: non_null

5.2 单独类配置

@JsonInclude(Include.NON_NULL)
public class WithdrawDetail implements Serializable {

}