Caused by: java.net.UnknownHostException: struts.apache.org

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啟動項目後報這個錯

Line: 184 - java/net/AbstractPlainSocketImpl.java:184:-1
 at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:70)
 at org.apache.struts2.dispatcher.Dispatcher.init_PreloadConfiguration(Dispatcher.java:446)
 at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:490)
 at org.apache.struts2.dispatcher.ng.InitOperations.initDispatcher(InitOperations.java:74)
 at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.init(StrutsPrepareAndExecuteFilter.java:57)
 at org.apache.catalina.core.ApplicationFilterConfig.initFilter(ApplicationFilterConfig.java:279)
 at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:260)
 at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:105)
 at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4809)
 at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5485)
 at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
 at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559)
 at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549)
 at java.util.concurrent.FutureTask.run(FutureTask.java:266)
 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
 at java.lang.Thread.run(Thread.java:745)
Caused by: Unable to load file:/D:/apache-tomcat-7.0.52/webapps/graduatephotos/WEB-INF/classes/struts.xml - Class: java.net.AbstractPlainSocketImpl
File: AbstractPlainSocketImpl.java
Method: connect
Line: 184 - java/net/AbstractPlainSocketImpl.java:184:-1
 at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.loadConfigurationFiles(XmlConfigurationProvider.java:1022)
 at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.loadDocuments(XmlConfigurationProvider.java:165)
 at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.init(XmlConfigurationProvider.java:132)
 at com.opensymphony.xwork2.config.impl.DefaultConfiguration.reloadContainer(DefaultConfiguration.java:225)
 at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:67)
 ... 16 more
Caused by: struts.apache.org - Class: java.net.AbstractPlainSocketImpl
File: AbstractPlainSocketImpl.java
Method: connect
Line: 184 - java/net/AbstractPlainSocketImpl.java:184:-1
 at com.opensymphony.xwork2.util.DomHelper.parse(DomHelper.java:119)
 at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.loadConfigurationFiles(XmlConfigurationProvider.java:1017)
 ... 20 more
Caused by: java.net.UnknownHostException: struts.apache.org
 at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:184)
 at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
 at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
 at java.net.Socket.connect(Socket.java:589)
 at java.net.Socket.connect(Socket.java:538)

報錯的原因就是因為沒有連網，它無法載入"http://struts.apache.org/dtds/struts-2.5.dtd這個DTD檔案，所以報錯，解決辦法除了讓電腦連上網之外，就是修改"http://struts.apache.org/dtds/struts-2.5.dtd對應的檔案位置，讓它從本地去尋找這個DTD檔案，而不是在網上載入這個檔案，做法如下：

　　

 

Struts中的dtd檔案地址：struts-2.3.15.3-all\src\core\src\main\resources

URL地址：

 

 這樣設定好後，即使不連網也能正常載入dtd檔案了

 

Caused by: java.net.UnknownHostException: struts.apache.org