[问题记录] spring-boot 打印启动时间

叁歲伎倆 2022-06-06 07:09 403阅读 0赞

**问题**  
spring-boot 工程启动结束会打印启动时间  
`Started Application in 12.805 seconds (JVM running for 20.686)`

最近新建一个工程发现启动完后并没有打印上面的那句话

**解决**

查看源码，发现打印日志在

public ConfigurableApplicationContext run(String... args) {
            StopWatch stopWatch = new StopWatch();
            stopWatch.start();
            ConfigurableApplicationContext context = null;
            FailureAnalyzers analyzers = null;
            configureHeadlessProperty();
            SpringApplicationRunListeners listeners = getRunListeners(args);
            listeners.starting();
            try {
                ApplicationArguments applicationArguments = new DefaultApplicationArguments(
                        args);
                ConfigurableEnvironment environment = prepareEnvironment(listeners,
                        applicationArguments);
                Banner printedBanner = printBanner(environment);
                context = createApplicationContext();
                analyzers = new FailureAnalyzers(context);
                prepareContext(context, environment, listeners, applicationArguments,printedBanner);
    
                //著名的refresh 
                refreshContext(context);
    
                afterRefresh(context, applicationArguments);
                listeners.finished(context, null);
                stopWatch.stop();
    
                //打印启动时间日志
                if (this.logStartupInfo) {
                    new StartupInfoLogger(this.mainApplicationClass)
                            .logStarted(getApplicationLog(), stopWatch);
                }
                return context;
            }
            catch (Throwable ex) {
                handleRunFailure(context, listeners, analyzers, ex);
                throw new IllegalStateException(ex);
            }
        }

public void logStarted(Log log, StopWatch stopWatch) {
            if (log.isInfoEnabled()) {
                log.info(getStartedMessage(stopWatch));
            }
        }

其打印是的info级日志，而我在logback配置启动类Application包的别类是WARN级别的，所以它并不打印时间，把启动类Application所在包日志级别改为info即可。