Struts2 显示图像/从属性文件中获取图像 url
Struts2 display image / get image url from a properties file
在我分配的一个使用 Struts2 的项目中，我需要做以下事情，但我是使用 Struts2.
的新手
- 将文本从标题和最常见/重复的文本移动到
.properties 文件。
- 更改图像的 URL 以使系统参数化，因此它们也应该在同一个
.properties 文件中。
我已经能够更改一些标题，首先将 Struts2 链接到我的 .properties 文件，然后是 answer.
Content.properties
login.logo=/resources/media/login.png
login.title=Login
现在，我的 JSP 文件仅用作 HTML 文件，它是这样的：
login.jsp
<%@page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@taglib prefix="s" uri="/struts-tags"%>
<%@taglib prefix="sj" uri="/struts-jquery-tags"%>
<%@taglib prefix="sjg" uri="/struts-jquery-grid-tags"%>
<%@taglib prefix="sb" uri="/struts-bootstrap-tags"%>
<%@taglib prefix="decorator" uri="sitemesh-decorator"%>
<%
response.setHeader("Cache-Control", "no-cache"); //HTTP 1.1
response.setHeader("Pragma", "no-cache"); //HTTP 1.0
response.setDateHeader("Expires", -1); //evita o caching no servidor proxy
%>
<!DOCTYPE>
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8" />
<meta charset="UTF-8" />
<title><s:text name="login.title" /></title>
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<link rel="shortcut icon" href='<s:url value="/resources/media/favicon_seg.ico"/>' />
<!-- Le HTML5 shim, for IE6-8 support of HTML elements -->
<!--[if lt IE 9]>
<script src="http://html5shim.googlecode.com/svn/trunk/html5.js"></script>
<![endif]-->
<sj:head locale="es" jqueryui="true" jquerytheme="ui-lightness" compressed="true" defaultIndicator="ajax_loading" />
<sb:head />
<link rel="stylesheet" href='<s:url value="/resources/css/login.css"/>' />
</head>
<body>
<div class="panel-footer ">
<img height="40" src="<s:url value="/resources/media/login.png"/>" class="pagelogo" alt="Logo" /> My Company
</div>
</body>
</html>
但是，如果我想使用属性文件更改上面文件中的这一部分，如下所示：
<img height="40" src="<s:url value="${login.logo}"/>" class="pagelogo" alt="Logo" /> My Company
有时我的页面显示正确，有时不正确，但刷新后（F5）它又显示或不显示。未显示时出现以下错误：
SEVERE: Servlet.service() for servlet [jsp] threw exception
org.apache.jasper.JasperException: /WEB-INF/content/login.jsp (line: [87], column: [28]) According to TLD or attribute directive in tag file, attribute [value] does not accept any expressions
at org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:42)
at org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:291)
at org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:114)
at org.apache.jasper.compiler.Validator$ValidateVisitor.checkXmlAttributes(Validator.java:1241)
at org.apache.jasper.compiler.Validator$ValidateVisitor.visit(Validator.java:879)
at org.apache.jasper.compiler.Node$CustomTag.accept(Node.java:1545)
at org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2392)
at org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2444)
at org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2450)
at org.apache.jasper.compiler.Node$Root.accept(Node.java:471)
at org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2392)
at org.apache.jasper.compiler.Validator.validateExDirectives(Validator.java:1853)
at org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:221)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:374)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:351)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:335)
at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:601)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:368)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:385)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:329)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at com.opensymphony.sitemesh.webapp.SiteMeshFilter.doFilter(SiteMeshFilter.java:59)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:728)
at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:590)
at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:524)
at org.apache.jasper.runtime.JspRuntimeLibrary.include(JspRuntimeLibrary.java:895)
at org.apache.jasper.runtime.PageContextImpl.include(PageContextImpl.java:648)
at org.apache.struts2.dispatcher.ServletDispatcherResult.doExecute(ServletDispatcherResult.java:132)
at org.apache.struts2.dispatcher.StrutsResultSupport.execute(StrutsResultSupport.java:191)
at com.opensymphony.xwork2.DefaultActionInvocation.executeResult(DefaultActionInvocation.java:372)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:276)
at org.apache.struts2.interceptor.CookieProviderInterceptor.intercept(CookieProviderInterceptor.java:75)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
at org.apache.struts2.interceptor.CookieInterceptor.intercept(CookieInterceptor.java:258)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
at org.apache.struts2.interceptor.CookieInterceptor.intercept(CookieInterceptor.java:258)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
at com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:265)
at org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:76)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
at com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:138)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:229)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
at com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:191)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
at org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:91)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
at org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:253)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
at com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:100)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
at com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:145)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
at com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:171)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
at org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
at com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:193)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
at com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:189)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
at org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:54)
at org.apache.struts2.components.ActionComponent.executeAction(ActionComponent.java:288)
at org.apache.struts2.components.ActionComponent.end(ActionComponent.java:172)
at org.apache.struts2.views.jsp.ComponentTagSupport.doEndTag(ComponentTagSupport.java:42)
at org.apache.jsp.index_jsp._jspx_meth_s_005faction_005f0(index_jsp.java:168)
at org.apache.jsp.index_jsp._jspService(index_jsp.java:127)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:443)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:385)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:329)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at com.opensymphony.sitemesh.webapp.SiteMeshFilter.obtainContent(SiteMeshFilter.java:129)
at com.opensymphony.sitemesh.webapp.SiteMeshFilter.doFilter(SiteMeshFilter.java:77)
at org.apache.catalina.core.ApplicationFilterC2017-12-11 11:04:52,566 ERROR (org.apache.struts2.components.ActionComponent) - Could not execute action: //login
hain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:96)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:478)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:650)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:803)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1459)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:748)
获取图像路径并将其显示在 JSP 中且有时不会出现上述错误的正确方法是什么？
我发现了一些与此错误相关的问题，但他们使用的是 JSTL 而我没有。
我在写这个问题时发现了另一个 post：JSP2 expression in Struts2 form input 他们在其中推荐使用 OGNL，而我读到的是以下形式：
<s:url ...>
如果我错了请纠正我，因为这些对我来说是新概念
这是post摘录
By default you cannot pass a JSP EL expression to a Struts2 tag. This is done for security purposes. If you wanted to, you could make a copy of struts-tags.tld and set to true for all of the tags. However, you should be aware of the security vulnerability involved in allowing tags to accept both JSP EL and OGNL expressions.
JSP EL is evaluated prior to invoking the tag handler, OGNL is evaluated afterwards (inside the tag). As such, if ${retPage} evaluated to an OGNL expression, then the tag may wind up doing something you didn't expect.
所以，在这种情况下，是否可以有任何解决方法来完成我想做的事情（从我的属性文件中获取图像 url 并使用 OGNL 或 EL 以任何一种方式显示它？
编辑：
我也尝试过这个答案的解决方案：
这建议将 s:url 更改为 c:url 在这种情况下它不会产生空白页（正如问题中提到的那样，这也是我重新加载页面时发生的情况），但这会导致 broken-image 图像以及一些 html ，如下所示：
如果需要，我可以提供所需的任何额外信息，因为我认为这是必需的，但正如我所说，我是这些技术的新手，因此不知道这个问题是否还需要其他任何信息完整或清楚足以回答。
我一直在寻找问题的答案，发现了以下问题：How to create dynamic images with struts2?
其中包含我在 accepted answer 中的问题的答案：
There is another simple way by using <img src=<s:text name="genTP" /> />. But I think is quite strange.
在我的例子中翻译成这样：
<img height="40" src="<s:text name="login.logo"/>" class="pagelogo" alt="Logo" /> Login
我的 content.properties 文件以这种方式更改图像路径：
login.logo=/oneFolderBefore/resources/media/login.png
login.title=Login
这样，我就能够正确显示我的属性文件中的图像，避免了上述错误。
在我分配的一个使用 Struts2 的项目中，我需要做以下事情，但我是使用 Struts2.
的新手- 将文本从标题和最常见/重复的文本移动到
.properties文件。 - 更改图像的 URL 以使系统参数化，因此它们也应该在同一个
.properties文件中。
我已经能够更改一些标题，首先将 Struts2 链接到我的 .properties 文件，然后是 answer.
Content.properties
login.logo=/resources/media/login.png
login.title=Login
现在，我的 JSP 文件仅用作 HTML 文件，它是这样的：
login.jsp
<%@page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@taglib prefix="s" uri="/struts-tags"%>
<%@taglib prefix="sj" uri="/struts-jquery-tags"%>
<%@taglib prefix="sjg" uri="/struts-jquery-grid-tags"%>
<%@taglib prefix="sb" uri="/struts-bootstrap-tags"%>
<%@taglib prefix="decorator" uri="sitemesh-decorator"%>
<%
response.setHeader("Cache-Control", "no-cache"); //HTTP 1.1
response.setHeader("Pragma", "no-cache"); //HTTP 1.0
response.setDateHeader("Expires", -1); //evita o caching no servidor proxy
%>
<!DOCTYPE>
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8" />
<meta charset="UTF-8" />
<title><s:text name="login.title" /></title>
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<link rel="shortcut icon" href='<s:url value="/resources/media/favicon_seg.ico"/>' />
<!-- Le HTML5 shim, for IE6-8 support of HTML elements -->
<!--[if lt IE 9]>
<script src="http://html5shim.googlecode.com/svn/trunk/html5.js"></script>
<![endif]-->
<sj:head locale="es" jqueryui="true" jquerytheme="ui-lightness" compressed="true" defaultIndicator="ajax_loading" />
<sb:head />
<link rel="stylesheet" href='<s:url value="/resources/css/login.css"/>' />
</head>
<body>
<div class="panel-footer ">
<img height="40" src="<s:url value="/resources/media/login.png"/>" class="pagelogo" alt="Logo" /> My Company
</div>
</body>
</html>
但是，如果我想使用属性文件更改上面文件中的这一部分，如下所示：
<img height="40" src="<s:url value="${login.logo}"/>" class="pagelogo" alt="Logo" /> My Company
有时我的页面显示正确，有时不正确，但刷新后（F5）它又显示或不显示。未显示时出现以下错误：
SEVERE: Servlet.service() for servlet [jsp] threw exception
org.apache.jasper.JasperException: /WEB-INF/content/login.jsp (line: [87], column: [28]) According to TLD or attribute directive in tag file, attribute [value] does not accept any expressions
at org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:42)
at org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:291)
at org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:114)
at org.apache.jasper.compiler.Validator$ValidateVisitor.checkXmlAttributes(Validator.java:1241)
at org.apache.jasper.compiler.Validator$ValidateVisitor.visit(Validator.java:879)
at org.apache.jasper.compiler.Node$CustomTag.accept(Node.java:1545)
at org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2392)
at org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2444)
at org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2450)
at org.apache.jasper.compiler.Node$Root.accept(Node.java:471)
at org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2392)
at org.apache.jasper.compiler.Validator.validateExDirectives(Validator.java:1853)
at org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:221)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:374)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:351)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:335)
at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:601)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:368)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:385)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:329)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at com.opensymphony.sitemesh.webapp.SiteMeshFilter.doFilter(SiteMeshFilter.java:59)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:728)
at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:590)
at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:524)
at org.apache.jasper.runtime.JspRuntimeLibrary.include(JspRuntimeLibrary.java:895)
at org.apache.jasper.runtime.PageContextImpl.include(PageContextImpl.java:648)
at org.apache.struts2.dispatcher.ServletDispatcherResult.doExecute(ServletDispatcherResult.java:132)
at org.apache.struts2.dispatcher.StrutsResultSupport.execute(StrutsResultSupport.java:191)
at com.opensymphony.xwork2.DefaultActionInvocation.executeResult(DefaultActionInvocation.java:372)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:276)
at org.apache.struts2.interceptor.CookieProviderInterceptor.intercept(CookieProviderInterceptor.java:75)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
at org.apache.struts2.interceptor.CookieInterceptor.intercept(CookieInterceptor.java:258)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
at org.apache.struts2.interceptor.CookieInterceptor.intercept(CookieInterceptor.java:258)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
at com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:265)
at org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:76)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
at com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:138)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:229)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
at com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:191)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
at org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:91)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
at org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:253)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
at com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:100)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
at com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:145)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
at com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:171)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
at org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
at com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:193)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
at com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:189)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
at org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:54)
at org.apache.struts2.components.ActionComponent.executeAction(ActionComponent.java:288)
at org.apache.struts2.components.ActionComponent.end(ActionComponent.java:172)
at org.apache.struts2.views.jsp.ComponentTagSupport.doEndTag(ComponentTagSupport.java:42)
at org.apache.jsp.index_jsp._jspx_meth_s_005faction_005f0(index_jsp.java:168)
at org.apache.jsp.index_jsp._jspService(index_jsp.java:127)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:443)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:385)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:329)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at com.opensymphony.sitemesh.webapp.SiteMeshFilter.obtainContent(SiteMeshFilter.java:129)
at com.opensymphony.sitemesh.webapp.SiteMeshFilter.doFilter(SiteMeshFilter.java:77)
at org.apache.catalina.core.ApplicationFilterC2017-12-11 11:04:52,566 ERROR (org.apache.struts2.components.ActionComponent) - Could not execute action: //login
hain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:96)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:478)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:650)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:803)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1459)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:748)
获取图像路径并将其显示在 JSP 中且有时不会出现上述错误的正确方法是什么？
我发现了一些与此错误相关的问题，但他们使用的是 JSTL 而我没有。
我在写这个问题时发现了另一个 post：JSP2 expression in Struts2 form input 他们在其中推荐使用 OGNL，而我读到的是以下形式：
<s:url ...>
如果我错了请纠正我，因为这些对我来说是新概念
这是post摘录
By default you cannot pass a JSP EL expression to a Struts2 tag. This is done for security purposes. If you wanted to, you could make a copy of struts-tags.tld and set to true for all of the tags. However, you should be aware of the security vulnerability involved in allowing tags to accept both JSP EL and OGNL expressions.
JSP EL is evaluated prior to invoking the tag handler, OGNL is evaluated afterwards (inside the tag). As such, if ${retPage} evaluated to an OGNL expression, then the tag may wind up doing something you didn't expect.
所以，在这种情况下，是否可以有任何解决方法来完成我想做的事情（从我的属性文件中获取图像 url 并使用 OGNL 或 EL 以任何一种方式显示它？
编辑：
我也尝试过这个答案的解决方案：
这建议将 s:url 更改为 c:url 在这种情况下它不会产生空白页（正如问题中提到的那样，这也是我重新加载页面时发生的情况），但这会导致 broken-image 图像以及一些 html ，如下所示：
如果需要，我可以提供所需的任何额外信息，因为我认为这是必需的，但正如我所说，我是这些技术的新手，因此不知道这个问题是否还需要其他任何信息完整或清楚足以回答。
我一直在寻找问题的答案，发现了以下问题：How to create dynamic images with struts2?
其中包含我在 accepted answer 中的问题的答案：
There is another simple way by using
<img src=<s:text name="genTP" /> />. But I think is quite strange.
在我的例子中翻译成这样：
<img height="40" src="<s:text name="login.logo"/>" class="pagelogo" alt="Logo" /> Login
我的 content.properties 文件以这种方式更改图像路径：
login.logo=/oneFolderBefore/resources/media/login.png
login.title=Login
这样，我就能够正确显示我的属性文件中的图像，避免了上述错误。