OSS有时连接不上的

17:23:55.993 CjpadSync ->   采集平板智慧课堂数据开始=========时间Mon Jan 14 17:23:55 CST 2019 
17:24:22.032  oss ->   [Client]Unable to execute HTTP request: UnknownHost 
17:24:22.633  oss ->   [Client]Unable to execute HTTP request: UnknownHost 
17:24:23.834  oss ->   [Client]Unable to execute HTTP request: UnknownHost 
17:24:26.235  oss ->   [Client]Unable to execute HTTP request: UnknownHost 
17:24:26.237 ConditionEvaluationReportLoggingListener ->   

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled. 
17:24:26.241 SpringApplication ->   Application run failed 
java.lang.IllegalStateException: Failed to execute CommandLineRunner
	at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:793)
	at org.springframework.boot.SpringApplication.callRunners(SpringApplication.java:774)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:335)
	at com.ecaicn.datasync.CjkjDataSyncApplication.main(CjkjDataSyncApplication.java:47)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:48)
	at org.springframework.boot.loader.Launcher.launch(Launcher.java:87)
	at org.springframework.boot.loader.Launcher.launch(Launcher.java:50)
	at org.springframework.boot.loader.JarLauncher.main(JarLauncher.java:51)
Caused by: com.aliyun.oss.ClientException: UnknownHost
	at com.aliyun.oss.common.utils.ExceptionFactory.createNetworkException(ExceptionFactory.java:71)
	at com.aliyun.oss.common.comm.DefaultServiceClient.sendRequestCore(DefaultServiceClient.java:128)
	at com.aliyun.oss.common.comm.ServiceClient.sendRequestImpl(ServiceClient.java:123)
	at com.aliyun.oss.common.comm.ServiceClient.sendRequest(ServiceClient.java:68)
	at com.aliyun.oss.internal.OSSOperation.send(OSSOperation.java:94)
	at com.aliyun.oss.internal.OSSOperation.doOperation(OSSOperation.java:149)
	at com.aliyun.oss.internal.OSSOperation.doOperation(OSSOperation.java:113)
	at com.aliyun.oss.internal.OSSBucketOperation.listObjects(OSSBucketOperation.java:420)
	at com.aliyun.oss.OSSClient.listObjects(OSSClient.java:526)
	at com.aliyun.oss.OSSClient.listObjects(OSSClient.java:520)
	at com.ecaicn.datasync.file.Oss.listObjects(Oss.java:26)
	at com.ecaicn.datasync.sync.CjpadSync.sync(CjpadSync.java:72)
	at com.ecaicn.datasync.CjkjDataSyncApplication.start(CjkjDataSyncApplication.java:99)
	at com.ecaicn.datasync.CjkjDataSyncApplication.initRunner(CjkjDataSyncApplication.java:78)
	at com.ecaicn.datasync.CjkjDataSyncApplication.run(CjkjDataSyncApplication.java:53)
	at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:790)
	... 11 common frames omitted
Caused by: java.net.UnknownHostException: cj-test.oss-cn-shenzhen.aliyuncs.com
	at java.net.InetAddress.getAllByName0(InetAddress.java:1280)
	at java.net.InetAddress.getAllByName(InetAddress.java:1192)
	at java.net.InetAddress.getAllByName(InetAddress.java:1126)
	at org.apache.http.impl.conn.SystemDefaultDnsResolver.resolve(SystemDefaultDnsResolver.java:45)
	at org.apache.http.impl.conn.DefaultHttpClientConnectionOperator.connect(DefaultHttpClientConnectionOperator.java:112)
	at org.apache.http.impl.conn.PoolingHttpClientConnectionManager.connect(PoolingHttpClientConnectionManager.java:373)
	at org.apache.http.impl.execchain.MainClientExec.establishRoute(MainClientExec.java:381)
	at org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:237)
	at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:185)
	at org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:111)
	at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:185)
	at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:83)
	at com.aliyun.oss.common.comm.DefaultServiceClient.sendRequestCore(DefaultServiceClient.java:125)
	... 25 common frames omitted
17:24:26.242 AnnotationConfigApplicationContext ->   Closing org.springframework.context.annotation.AnnotationConfigApplicationContext@30e6a763: startup date [Mon Jan 14 17:23:26 CST 2019]; root of context hierarchy 
17:24:26.244 AnnotationMBeanExporter ->   Unregistering JMX-exposed beans on shutdown 
17:24:26.244 AnnotationMBeanExporter ->   Unregistering JMX-exposed beans 
17:24:26.246 DruidDataSource ->   {dataSource-1} closed