java - Servlet 3.1应用程序中监听器的IllegalArgumentException加载属性

Question

我有一个ServletContextListener，当它试图从文件中加载属性时，它给了我一个IllegalArgumentException。我的代码如下：

private final static Properties properties = new Properties(); 

@Override
public void contextInitialized(ServletContextEvent sce) {        
    ServletContext sc = sce.getServletContext();  

    try {                        
        // Load MyProject's properties file.
        properties.load(sc.getResourceAsStream(sc.getInitParameter("myProjectPropsFilePath")));                                        
    } 
    catch(IOException e) {                                     
        Utils.printStackTrace(e);
    }

    // Write properties to ServletContext.
    sc.setAttribute("properties", properties);
}

从 web.xml中检索了context参数，但是我不明白为什么在行中抛出 IllegalArgumentException：

properties.load(sc.getResourceAsStream(sc.getInitParameter("myProjectPropsFilePath")));

stacktrace如下：

08-Jun-2015 12:52:07.439 SEVERE [http-apr-8080-exec-34] org.apache.catalina.core.StandardContext.listenerStart Exception sending context initialized event to listener instance of class myProject.listener.SetPropertiesServletContextListener
java.lang.IllegalArgumentException: The resource path [\WEB-INF\properties\MyProject.properties] is not valid
at org.apache.catalina.webresources.StandardRoot.validate(StandardRoot.java:237)
at org.apache.catalina.webresources.StandardRoot.getResource(StandardRoot.java:199)
at org.apache.catalina.webresources.StandardRoot.getResource(StandardRoot.java:193)
at org.apache.catalina.core.ApplicationContext.getResourceAsStream(ApplicationContext.java:559)
at org.apache.catalina.core.ApplicationContextFacade.getResourceAsStream(ApplicationContextFacade.java:209)
at myProject.listener.SetPropertiesServletContextListener.contextInitialized(SetPropertiesServletContextListener.java:26)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4738)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5158)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:726)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:702)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:697)
at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:579)
at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:455)
at org.apache.catalina.startup.HostConfig.check(HostConfig.java:1554)
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:483)
at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:300)
at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)
at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)
at org.apache.catalina.manager.ManagerServlet.check(ManagerServlet.java:1428)
at org.apache.catalina.manager.ManagerServlet.deploy(ManagerServlet.java:885)
at org.apache.catalina.manager.ManagerServlet.doGet(ManagerServlet.java:343)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:618)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:301)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.filters.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:108)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:615)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:136)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:74)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:610)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:516)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1015)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:652)
at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:277)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2451)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2440)
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:744)

有任何想法吗？我正在使用 Apache Tomcat 8.0.3。

web.xml的适当部分是：

<!-- Listeners and parameters. -->
<listener>
    <description>SetPropertiesServletContextListener</description>
    <listener-class>myProject.listener.SetPropertiesServletContextListener</listener-class>
</listener>
<context-param>
    <param-name>myProjectPropsFilePath</param-name>
    <param-value>\WEB-INF\properties\myProject.properties</param-value>
</context-param>

Answer 1

该路径应包含/作为分隔符，因为/ WEB-INF /在Windows和Linux中保持相同。您可能在web.xml中有错误的值。根据Java API specs，您始终使用/。
这是错误的：<param-value>\WEB-INF\properties\myProject.properties</param-value>
应该是：
<param-value>/WEB-INF/properties/myProject.properties</param-value>