空屬性賦值問題

MyBeanUtils類

public class MyBeanUtils {
  
  public static String[] getNullPropertyNames(Object source){
    BeanWrapper beanWrapper=new BeanWrapperImpl(source);
    PropertyDescriptor[] pds=beanWrapper.getPropertyDescriptors();
    List<String> nullPropertyNames=new ArrayList<>();
    for (PropertyDescriptor pd:pds){
      String propertyName=pd.getName();
      if(beanWrapper.getPropertyValue(propertyName)==null){
        nullPropertyNames.add(propertyName);
      }
    }
    return nullPropertyNames.toArray(new String[nullPropertyNames.size()]);
  }
}

在NewServiceImpl中對updateNew方法進行修改

@Override
  public News updateNew(Long id,News news) {
    News news1=newRepository.findById(id).orElse(null);
    if(news1==null){
    //   System.out.println("未獲得更新物件");
      throw new NotFoundException("該新聞不存在");
    }
    //更新後傳入的news複製給news1，查詢更新資料news中空值屬性，忽略不復制給news1
    BeanUtils.copyProperties(news,news1,MyBeanUtils.getNullPropertyNames(news));
    news1.setUpdateTime(new Date());
    return newRepository.save(news1);
  }

日誌列印

新建一個LogAspect類

@Aspect
@Component
public class LogAspect {

  private final Logger logger= LoggerFactory.getLogger(this.getClass());

  @Pointcut("execution(* com.zr0726.news.web.*.*(..))")
  public void log(){}

  @Before("log()")
  public void doBefore(JoinPoint joinPoint){
    //獲得request
    ServletRequestAttributes attributes=(ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
    HttpServletRequest request=attributes.getRequest();
    //獲得url和ip
    String url=request.getRequestURL().toString();
    String ip=request.getRemoteAddr();
    String classMethod=joinPoint.getSignature().getDeclaringTypeName()+"."+joinPoint.getSignature().getName();
    Object[] args=joinPoint.getArgs();
    Requestlog requestlog=new Requestlog(url,ip,classMethod,args);
    logger.info("_____________________doBefore_______________________");
  }

  @After("log()")
  public void doAfter(){
    logger.info("_____________________doAfter_______________________");
  }

  @AfterReturning(returning = "result",pointcut = "log()")
  public void adAfterReturn(Object result){
    logger.info("Result: {}",result);
  }
  
  private class Requestlog{
    private String url;
    private String ip;
    private String classMethod;
    private Object[] args;

    public Requestlog(String url,String ip,String className,Object[] args) {
      this.url = url;
      this.ip = ip;
      this.classMethod = className;
      this.args = args;
    }

    @Override
    public String toString() {
      return "Requestlog{" +
          "url='" + url + '\'' +
          ",ip='" + ip + '\'' +
          ",classMethod='" + classMethod + '\'' +
          ",args=" + Arrays.toString(args) +
          '}';
    }
  }
}

效果展示

總結

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