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('未獲得更新對象'); throw new NotFoundException('該新聞不存在'); } //更新后傳入的news復制給news1，查找更新數據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); }

日志打印

新建一個LogAspect類

@Aspect@Componentpublic 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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