Java 网络是无法访问的异常

当我试图通过

https://graph.facebook.com/oauth/access_token?client_id=xxx&client_secret=xxx8&grant_type=fb_exchange_token&fb_exchange_token=xxx

对于HttpClient类，我得到的响应类似于

异常：网络不可访问

。它以前工作过，但今天突然停止了工作。我没有对我的代码和网络配置设置做任何更改，我想知道可能是什么问题。当我检查日志时，错误是由以下原因引起的：

：java.net.SocketException:网络不可访问

如果我尝试调用url

https://graph.facebook.com/oauth/access_token?client_id=xxx&client_secret=xxx8&grant_type=fb_exchange_token&fb_exchange_token=xxx

我可以直接从浏览器获取accesstoken

我被这个问题困住了。谢谢

下面是异常堆栈跟踪

at java.net.PlainSocketImpl.socketConnect(Native Method)
    at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:333)
    at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:195)
    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:182)
    at java.net.Socket.connect(Socket.java:507)
    at java.net.Socket.connect(Socket.java:457)
    at sun.net.NetworkClient.doConnect(NetworkClient.java:157)
    at sun.net.www.http.HttpClient.openServer(HttpClient.java:365)
    at sun.net.www.http.HttpClient.openServer(HttpClient.java:477)
    at sun.net.www.protocol.https.HttpsClient.<init>(HttpsClient.java:280)
    at sun.net.www.protocol.https.HttpsClient.New(HttpsClient.java:337)
    at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.getNewHttpClient(AbstractDelegateHttpsURLConnection.java:176)
    at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:736)
    at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:162)
    at sun.net.www.protocol.https.HttpsURLConnectionImpl.connect(HttpsURLConnectionImpl.java:133)
    at eqs.snp.util.HTTPRequestClient.setContent(HTTPRequestClient.java:132)
    at eqs.snp.sn.facebook.connector.FacebookAPI.refreshAccessToken(FacebookAPI.java:1750)
    at eqs.snp.sn.facebook.facade.FacebookFacade.getRegisterUser(FacebookFacade.java:262)
    at eqs.snp.sn.facebook.struts.action.FbUserAction.fbredirect(FbUserAction.java:195)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:585)
    at com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:440)
    at com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:279)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:242)
    at com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:163)
    at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
    at com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:249)
    at org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68)
    at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
    at com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:122)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
    at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:195)
    at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
    at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:195)
    at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
    at com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:148)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
    at org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:93)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
    at org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:235)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
    at com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:89)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
    at com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:128)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
    at org.apache.struts2.interceptor.ProfilingActivationInterceptor.intercept(ProfilingActivationInterceptor.java:104)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
    at org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:267)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
    at com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:126)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
    at com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:138)
    at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
    at com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:148)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
    at org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
    at com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:128)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
    at com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:176)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
    at org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:52)
    at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:468)
    at org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)
    at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:76)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:172)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
    at org.apache.catalina.valves.FastCommonAccessLogValve.invoke(FastCommonAccessLogValve.java:482)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174)
    at org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:200)
    at org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:283)
    at org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:773)
    at org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:703)
    at org.apache.jk.common.ChannelSocket$SocketConnection.runIt(ChannelSocket.java:895)
    at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689)
    at java.lang.Thread.run(Thread.java:595)

位于java.net.PlainSocketImpl.socketConnect（本机方法）
位于java.net.PlainSocketImpl.doConnect（PlainSocketImpl.java:333）
位于java.net.PlainSocketImpl.connectToAddress（PlainSocketImpl.java:195）
位于java.net.PlainSocketImpl.connect（PlainSocketImpl.java:182）
位于java.net.Socket.connect（Socket.java:507）
位于java.net.Socket.connect（Socket.java:457）
位于sun.net.NetworkClient.doConnect（NetworkClient.java:157）
位于sun.net.www.http.HttpClient.openServer（HttpClient.java:365）
位于sun.net.www.http.HttpClient.openServer（HttpClient.java:477）
在sun.net.www.protocol.https.HttpsClient.（HttpsClient.java:280）
位于sun.net.www.protocol.https.HttpsClient.New（HttpsClient.java:337）
位于sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.getNewHttpClient（AbstractDelegateHttpsURLConnection.java:176）
位于sun.net.www.protocol.http.HttpURLConnection.plainConnect（HttpURLConnection.java:736）
位于sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect（AbstractDelegateHttpsURLConnection.java:162）
位于sun.net.www.protocol.https.HttpsURLConnectionImpl.connect（HttpsURLConnectionImpl.java:133）
位于eqs.snp.util.HTTPRequestClient.setContent（HTTPRequestClient.java:132）
位于eqs.snp.sn.facebook.connector.FacebookAPI.refreshAccessToken（FacebookAPI.java:1750）
在eqs.snp.sn.facebook.facade.FacebookFacade.getRegisterUser（FacebookFacade.java:262）
位于eqs.snp.sn.facebook.struts.action.FbUserAction.fbredirect（FbUserAction.java:195）
在sun.reflect.NativeMethodAccessorImpl.invoke0（本机方法）处
位于sun.reflect.NativeMethodAccessorImpl.invoke（NativeMethodAccessorImpl.java:39）
在sun.reflect.DelegatingMethodAccessorImpl.invoke（DelegatingMethodAccessorImpl.java:25）中
位于java.lang.reflect.Method.invoke（Method.java:585）
在com.opensymphony.xwork2.DefaultActionInvocation.invokeAction（DefaultActionInvocation.java:440）
位于com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly（DefaultActionInvocation.java:279）
位于com.opensymphony.xwork2.DefaultActionInvocation.invoke（DefaultActionInvocation.java:242）
在com.opensymphony.xwork2.intercept.DefaultWorkflowIntercept.doIntercept（DefaultWorkflowIntercept.java:163）
在com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept（MethodFilterInterceptor.java:87）
位于com.opensymphony.xwork2.DefaultActionInvocation.invoke（DefaultActionInvocation.java:236）
位于com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept（ValidationInterceptor.java:249）
位于org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept（AnnotationValidationInterceptor.java:68）
在com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept（MethodFilterInterceptor.java:87）
位于com.opensymphony.xwork2.DefaultActionInvocation.invoke（DefaultActionInvocation.java:236）
在com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept上（ConversionErrorInterceptor.java:122）
位于com.opensymphony.xwork2.DefaultActionInvocation.invoke（DefaultActionInvocation.java:236）
在com.opensymphony.xwork2.interceptor.parameters-sinterceptor.doIntercept（parameters-sinterceptor.java:195）
在com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept（MethodFilterInterceptor.java:87）
位于com.opensymphony.xwork2.DefaultActionInvocation.invoke（DefaultActionInvocation.java:236）
在com.opensymphony.xwork2.interceptor.parameters-sinterceptor.doIntercept（parameters-sinterceptor.java:195）
在com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept（MethodFilterInterceptor.java:87）
位于com.opensymphony.xwork2.DefaultActionInvocation.invoke（DefaultActionInvocation.java:236）
在com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept上（StaticParametersInterceptor.java:148）
位于com.opensymphony.xwork2.DefaultActionInvocation.invoke（DefaultActionInvocation.java:236）
位于org.apache.struts2.interceptor.CheckboxInterceptor.intercept（CheckboxInterceptor.java:93）
位于com.opensymphony.xwork2.DefaultActionInvocation.invoke（DefaultActionInvocation.java:236）
位于org.apache.struts2.interceptor.FileUploadInterceptor.intercept（FileUploadInterceptor.java:235）
位于com.opensymphony.xwork2.DefaultActionInvocation.invoke（DefaultActionInvocation.java:236）
在com.opensymphony.xwork2.interceptor.modeldriventerceptor.intercept（modeldriventerceptor.java:89）
位于com.opensymphony.xwork2.DefaultActionInvocation.invoke（DefaultActionInvocation.java:236）
位于com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept（ScopedModelDrivenInterceptor.java:128）
位于com.opensymphony.xwork2.DefaultActionInvocation.invoke（DefaultActionInvocation.java:236）
位于org.apache.struts2.interceptor.ProfilingActivationInterceptor.interceptor（ProfilingActivationInterceptor.java:104）
位于com.opensymphony.xwork2.DefaultActionInvocation.invoke（DefaultActionInvocation.java:236）
位于org.apache.struts2.interceptor.debug.DebuggingInterceptor.intercept（DebuggingInterceptor.java:267）
A.