idea创建javaweb项目

IDEA告警详解：Optional.isPresent can be replaced with functional-style expression IDEA告警：Unnecessary unboxing ‘xxx.intValue()‘ idea文件旁边都有0%classes,0% lines covered IDEA连接数据库错误：Server returns invalid timezone. Go to ‘Advanced‘ tab and set ‘serverTimezon‘ 错误 IDEA 告警：Library source does not match the bytecode for class IDEA 告警Unpredictable ‘new BigDecimal()‘ call 取消IDEA的Autowired对字段注解告警 IDEA 告警：Stream API call chain can be simplified IDEA告警：Field can be converted to a local varible IntelliJ IDEA 中看到 classes, sources, javadocs 三种jar的区别和各自的作用