在 JSP 文件中导入带有 JSTL 核心的 XML 文件时，请求的资源不可用

【问题标题】：Requested resource is not available when importing XML file with JSTL core in JSP file在 JSP 文件中导入带有 JSTL 核心的 XML 文件时，请求的资源不可用
【发布时间】：2015-04-01 20:32:11
【问题描述】：

我是 Java EE 的新手，并且刚刚开始学习 JSTL1.2 核心 中的 XML 库。

我正在尝试编写一个简单的 JSP 文件来读取 XML 文件并显示它。 问题是，当我尝试导入 XML 文件时，服务器会抛出有关导入 XML 文件的行的异常：

请求的资源 (/test/document.xml) 不可用。

这是我的 JSP 文件：

<!DOCTYPE html>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title></title>
</head>
<body>
<c:import url="document.xml" varReader="documentReader" >
    <c:out value="${ documentReader }" />
</c:import>
</body>
</html>

XML 文件 document.xml 位于我项目的根目录。 这是服务器 Apache Tomcat 7.0.54 抛出的异常：

SEVERE: "Servlet.service()" pour la servlet default a lancé une exception
java.io.FileNotFoundException: The requested resource (/test/document.xml) is not available
    at org.apache.catalina.servlets.DefaultServlet.serveResource(DefaultServlet.java:807)
    at org.apache.catalina.servlets.DefaultServlet.doGet(DefaultServlet.java:442)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:620)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:748)
    at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:604)
    at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:543)
    at org.apache.taglibs.standard.tag.common.core.ImportSupport.acquireString(ImportSupport.java:314)
    at org.apache.taglibs.standard.tag.common.core.ImportSupport.acquireReader(ImportSupport.java:341)
    at org.apache.taglibs.standard.tag.common.core.ImportSupport.doStartTag(ImportSupport.java:151)
    at org.apache.jsp.test_005fel_jsp._jspx_meth_c_005fimport_005f0(test_005fel_jsp.java:109)
    at org.apache.jsp.test_005fel_jsp._jspService(test_005fel_jsp.java:77)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1040)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:607)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:314)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Unknown Source)

avr. 01, 2015 8:38:13 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [jsp] in context with path [/test] threw exception [An exception occurred processing JSP page /test_el.jsp at line 9

6: <title>Création d'un client.</title>
7: </head>
8: <body>
9: <c:import url="document.xml" varReader="monReader" >
10:     <c:out value="${ monReader }" />
11: </c:import>
12: </body>


Stacktrace:] with root cause
java.io.FileNotFoundException: The requested resource (/test/document.xml) is not available
    at org.apache.catalina.servlets.DefaultServlet.serveResource(DefaultServlet.java:807)
    at org.apache.catalina.servlets.DefaultServlet.doGet(DefaultServlet.java:442)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:620)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:748)
    at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:604)
    at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:543)
    at org.apache.taglibs.standard.tag.common.core.ImportSupport.acquireString(ImportSupport.java:314)
    at org.apache.taglibs.standard.tag.common.core.ImportSupport.acquireReader(ImportSupport.java:341)
    at org.apache.taglibs.standard.tag.common.core.ImportSupport.doStartTag(ImportSupport.java:151)
    at org.apache.jsp.test_005fel_jsp._jspx_meth_c_005fimport_005f0(test_005fel_jsp.java:109)
    at org.apache.jsp.test_005fel_jsp._jspService(test_005fel_jsp.java:77)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1040)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:607)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:314)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Unknown Source)

【问题讨论】：

    标签： xml jsp tomcat jakarta-ee


    【解决方案1】：

    我尝试了其他方法来使用文件的绝对路径读取 XML 文件。这不是最终解决方案，而是部分解决方案，可以提供更多帮助。 我已将以下 value 赋予属性 url ：

    <c:import url="file:/C:/PathToWS/WorkSpace/JavaEEProject/document.xml" varReader="xmlReader" >
<c:out value="${ xmlReader }" />
</c:import>

    我已经在 XML 文件的完整路径之前写了file，以指定用于访问资源（本例中的文件）的协议，我知道它也可以是http 或ftp。

    然后，我可以读取并解析存储在xmlReader 中的XML 文件的内容。

    当然，XML 文件不需要在 java EE 项目的根目录下，它可以在磁盘中的任何位置。

    【讨论】：

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