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Question

我正在尝试使用Coldfusion 9上的表扩展来获得Markdown。在stackoverflow上还有一些关于CF和Markdown的类似问题，但没有一个涉及扩展。

到目前为止，我已经尝试过了;

markdownj来自javaloader.cfc
pegdown来自javaloader.cfc
showdownjs via orangepips nice cfc （我会链接所有这些，但没有超过2的代表）

所有这些都适用于基本Markdown，但没有一个支持开箱即用的表格 pegdown和showdown.js都支持表扩展。但Markdownj目前并不支持它，但我认为值得一试。

我认为我的问题在于在pegdown或showdown中加载扩展名的语法是否正确。两者的工作方式完全不同，一个是纯Java，另一个是Javascript解释。

对于pegdown

我的代码非常简单，只需使用javaloader加载pegdown和它所需的parboiled库。这部分看起来工作正常，没有错误但是当我尝试使用pegdown类时，我得到一个相当普遍的错误;

An exception occurred while instantiating a Java object. The class must not be an interface or an abstract class. Error: ''.

调用pegdown的代码;

<cfscript>
    jClass = [
        "#getDirectoryFromPath(getCurrentTemplatePath())#/pegdown/pegdown-1.2.1.jar"
        ,   "#getDirectoryFromPath(getCurrentTemplatePath())#/pegdown/parboiled-core-1.1.3.jar"
        ];
    javaloader      = createObject('component','components.javaloader.JavaLoader').init(jClass, true);

    variables.pegdown = javaloader.create("org.pegdown.PegDownProcessor");
</cfscript>
<cfdump var="#variables.pegdown#" />

对于showdownjs：

我已经尝试将扩展文件（extensions / table.js）添加到var进行评估，并根据文档将扩展var添加到转换器选项，但它不起作用。我猜测showdown.js不希望在底层Java scriptEngineManager中运行，因为主showdown.js脚本无法“看到”表扩展，在第246行失败;

The script had an error: sun.org.mozilla.javascript.internal.JavaScriptException: Extension 'undefined' could not be loaded. It was either not found or is not a valid extension. (#246) in at line number 246

我的showdown.js代码基于上面链接问题中的Orangepips答案。

<cfcomponent output="false" accessors="true">
    <cffunction name="init" output="false" access="public" returntype="Showdown" hint="Constructor">
        <cfset variables.manager = createObject("java", "javax.script.ScriptEngineManager").init()>
        <cfset variables.engine = manager.getEngineByName("javascript")>
        <cfreturn this/>
    </cffunction>

    <cffunction name="toHTML" output="false" access="public" returntype="any" hint="">
        <cfargument name="markdownText" type="string" required="true"/>
        <cfset var local = structNew()/>
        <cfset var bindings = variables.engine.createBindings()>
        <cfset var result = "">
        <cfset var showdownJS = "" />

        <cftry>
            <cfset bindings.put("markdownText", arguments.markdownText)>
            <cfset variables.engine.setBindings(bindings, createObject("java", "javax.script.ScriptContext").ENGINE_SCOPE)>
            <cfset showdownJS &= fileRead('#getDirectoryFromPath(getCurrentTemplatePath())#/showdown.js')>
            <cfset showdownJS &= fileRead('#getDirectoryFromPath(getCurrentTemplatePath())#/extensions/table.js')>
            <cfset showdownJS &= showdownAdapterJS()>
            <cfset result = engine.eval(showdownJS)>
            <cfcatch type="javax.script.ScriptException">
                <cfset result = "The script had an error: " & cfcatch.Message>
            </cfcatch>
        </cftry>

        <cfreturn result>
    </cffunction>

    <cffunction name="showdownAdapterJS" output="false" access="private" returntype="string" hint="">
        <cfset var local = structNew()/>
<cfsavecontent variable="local.javascript">
<cfoutput>#chr(13)##chr(10)#
var __converter = new Showdown.converter({extensions:['table']});
__converter.makeHtml(markdownText);</cfoutput>
</cfsavecontent>
        <cfreturn local.javascript>
    </cffunction>
</cfcomponent>

我对任何想法持开放态度，对一种解决方案没有任何特别的偏好。

栈跟踪

java.lang.ClassNotFoundException: org.parboiled.BaseParser at 
coldfusion.bootstrap.BootstrapClassLoader.loadClass(BootstrapClassLoader.java:235) at 
java.lang.ClassLoader.loadClass(Unknown Source) at 
com.compoundtheory.classloader.NetworkClassLoader.loadClass(NetworkClassLoader.java:463) at 
java.lang.ClassLoader.loadClass(Unknown Source) at 
java.lang.ClassLoader.loadClassInternal(Unknown Source) at 
java.lang.ClassLoader.defineClass1(Native Method) at 
java.lang.ClassLoader.defineClass(Unknown Source) at 
java.lang.ClassLoader.defineClass(Unknown Source) at 
com.compoundtheory.classloader.NetworkClassLoader.loadClass(NetworkClassLoader.java:450) at 
java.lang.ClassLoader.loadClass(Unknown Source) at 
java.lang.ClassLoader.loadClassInternal(Unknown Source) at 
java.lang.Class.getDeclaredFields0(Native Method) at 
java.lang.Class.privateGetDeclaredFields(Unknown Source) at 
java.lang.Class.privateGetPublicFields(Unknown Source) at 
java.lang.Class.getFields(Unknown Source) at 
coldfusion.runtime.java.ObjectHandler.Initialize(ObjectHandler.java:35) at 
coldfusion.runtime.java.ObjectHandler.<init>(ObjectHandler.java:30) at 
coldfusion.runtime.java.ReflectionCache$1.fetch(ReflectionCache.java:29) at 
coldfusion.util.SoftCache.get_statsOff(SoftCache.java:133) at 
coldfusion.util.SoftCache.get(SoftCache.java:81) at 
coldfusion.runtime.java.ReflectionCache.get(ReflectionCache.java:36) at 
coldfusion.runtime.java.JavaProxy.<init>(JavaProxy.java:35) at 
sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at 
sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source) at 
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source) at 
java.lang.reflect.Constructor.newInstance(Unknown Source) at 
coldfusion.runtime.java.JavaProxy.CreateObject(JavaProxy.java:166) at 
coldfusion.runtime.java.JavaProxy.invoke(JavaProxy.java:80) at 
coldfusion.runtime.CfJspPage._invoke(CfJspPage.java:2360) at 
cfJavaLoader2ecfc535209679$funcCREATEJAVAPROXY.runFunction(/srv/vhosts/myproject/httpdocs/components/javaloader/JavaLoader.cfc:329) at 
coldfusion.runtime.UDFMethod.invoke(UDFMethod.java:472) at 
coldfusion.filter.SilentFilter.invoke(SilentFilter.java:47) at 
coldfusion.runtime.UDFMethod$ReturnTypeFilter.invoke(UDFMethod.java:405) at 
coldfusion.runtime.UDFMethod$ArgumentCollectionFilter.invoke(UDFMethod.java:368) at 
coldfusion.filter.FunctionAccessFilter.invoke(FunctionAccessFilter.java:55) at 
coldfusion.runtime.UDFMethod.runFilterChain(UDFMethod.java:321) at 
coldfusion.runtime.UDFMethod.invoke(UDFMethod.java:220) at 
coldfusion.runtime.CfJspPage._invokeUDF(CfJspPage.java:2582) at 
cfJavaLoader2ecfc535209679$funcCREATE.runFunction(/srv/vhosts/myproject/httpdocs/components/javaloader/JavaLoader.cfc:87) at 
coldfusion.runtime.UDFMethod.invoke(UDFMethod.java:472) at 
coldfusion.filter.SilentFilter.invoke(SilentFilter.java:47) at 
coldfusion.runtime.UDFMethod$ReturnTypeFilter.invoke(UDFMethod.java:405) at 
coldfusion.runtime.UDFMethod$ArgumentCollectionFilter.invoke(UDFMethod.java:368) at 
coldfusion.filter.FunctionAccessFilter.invoke(FunctionAccessFilter.java:55) at 
coldfusion.runtime.UDFMethod.runFilterChain(UDFMethod.java:321) at 
coldfusion.runtime.UDFMethod.invoke(UDFMethod.java:220) at 
coldfusion.runtime.TemplateProxy.invoke(TemplateProxy.java:491) at 
coldfusion.runtime.TemplateProxy.invoke(TemplateProxy.java:337) at 
coldfusion.runtime.CfJspPage._invoke(CfJspPage.java:2360) at 
cfpegdown2ecfm1473046932.runPage(/srv/vhosts/myproject/httpdocs/_temp/markdown/pegdown.cfm:22) at 
coldfusion.runtime.CfJspPage.invoke(CfJspPage.java:231) at 
coldfusion.tagext.lang.IncludeTag.doStartTag(IncludeTag.java:416) at 
coldfusion.runtime.CfJspPage._emptyTcfTag(CfJspPage.java:2722) at 
cfApplication2ecfc294205112$funcONREQUEST.runFunction(/srv/vhosts/myproject/httpdocs/Application.cfc:377) at 
coldfusion.runtime.UDFMethod.invoke(UDFMethod.java:472) at 
coldfusion.runtime.UDFMethod$ReturnTypeFilter.invoke(UDFMethod.java:405) at 
coldfusion.runtime.UDFMethod$ArgumentCollectionFilter.invoke(UDFMethod.java:368) at 
coldfusion.filter.FunctionAccessFilter.invoke(FunctionAccessFilter.java:55) at 
coldfusion.runtime.UDFMethod.runFilterChain(UDFMethod.java:321) at 
coldfusion.runtime.UDFMethod.invoke(UDFMethod.java:220) at 
coldfusion.runtime.TemplateProxy.invoke(TemplateProxy.java:491) at 
coldfusion.runtime.TemplateProxy.invoke(TemplateProxy.java:337) at 
coldfusion.runtime.AppEventInvoker.invoke(AppEventInvoker.java:88) at 
coldfusion.runtime.AppEventInvoker.onRequest(AppEventInvoker.java:280) at 
coldfusion.filter.ApplicationFilter.invoke(ApplicationFilter.java:356) at 
coldfusion.filter.RequestMonitorFilter.invoke(RequestMonitorFilter.java:48) at 
coldfusion.filter.MonitoringFilter.invoke(MonitoringFilter.java:40) at 
coldfusion.filter.PathFilter.invoke(PathFilter.java:94) at 
coldfusion.filter.ExceptionFilter.invoke(ExceptionFilter.java:70) at 
coldfusion.filter.BrowserDebugFilter.invoke(BrowserDebugFilter.java:79) at 
coldfusion.filter.ClientScopePersistenceFilter.invoke(ClientScopePersistenceFilter.java:28) at 
coldfusion.filter.BrowserFilter.invoke(BrowserFilter.java:38) at 
coldfusion.filter.NoCacheFilter.invoke(NoCacheFilter.java:46) at 
coldfusion.filter.GlobalsFilter.invoke(GlobalsFilter.java:38) at 
coldfusion.filter.DatasourceFilter.invoke(DatasourceFilter.java:22) at 
coldfusion.filter.CachingFilter.invoke(CachingFilter.java:62) at 
coldfusion.CfmServlet.service(CfmServlet.java:200) at 
coldfusion.bootstrap.BootstrapServlet.service(BootstrapServlet.java:89) at 
jrun.servlet.FilterChain.doFilter(FilterChain.java:86) at 
com.intergral.fusionreactor.filter.FusionReactorCoreFilter.doRequestNoFilter(FusionReactorCoreFilter.java:712) at 
com.intergral.fusionreactor.filter.FusionReactorCoreFilter.doFusionRequest(FusionReactorCoreFilter.java:341) at 
com.intergral.fusionreactor.filter.FusionReactorCoreFilter.doFilter(FusionReactorCoreFilter.java:246) at 
com.intergral.fusionreactor.filter.FusionReactorFilter.doFilter(FusionReactorFilter.java:121) at 
jrun.servlet.FilterChain.doFilter(FilterChain.java:94) at 
coldfusion.monitor.event.MonitoringServletFilter.doFilter(MonitoringServletFilter.java:42) at 
coldfusion.bootstrap.BootstrapFilter.doFilter(BootstrapFilter.java:46) at 
jrun.servlet.FilterChain.doFilter(FilterChain.java:94) at 
jrun.servlet.FilterChain.service(FilterChain.java:101) at 
jrun.servlet.ServletInvoker.invoke(ServletInvoker.java:106) at 
jrun.servlet.JRunInvokerChain.invokeNext(JRunInvokerChain.java:42) at 
jrun.servlet.JRunRequestDispatcher.invoke(JRunRequestDispatcher.java:286) at 
jrun.servlet.ServletEngineService.dispatch(ServletEngineService.java:543) at 
jrun.servlet.jrpp.JRunProxyService.invokeRunnable(JRunProxyService.java:203) at 
jrunx.scheduler.ThreadPool$ThreadThrottle.invokeRunnable(ThreadPool.java:428) at 
jrunx.scheduler.WorkerThread.run(WorkerThread.java:66)

更新

现在感谢barnyr了问题源于我对Java的不了解以及PegDown和Parboiled的一些额外依赖。

Parboiled需要Pegdown的java和核心.jars。 Pegdown希望找到ASM library 我使用的是4.1版并包含-all-版本。建议只包括必要的asm罐子，但现在这足以让我更进一步。

CF9的工作代码（在JRUN / Linux上运行）

<!--- Load some demo markdown content --->
<cfset markdownString = fileRead("#getDirectoryFromPath(getCurrentTemplatePath())#/demo.txt")>

<!--- Directory containing all the necessary jar files. --->
<cfset jarDir = "#getDirectoryFromPath(getCurrentTemplatePath())#pegdown" />

<!--- Array of necessary classes --->
<cfset jClass = [
        "#jarDir#/parboiled-java-1.1.3.jar"
        ,   "#jarDir#/asm-all-4.1.jar"
        ,   "#jarDir#/parboiled-core-1.1.3.jar"
        , "#jarDir#/pegdown-1.2.1.jar"
        ] />
<cfset javaloader = createObject('component','components.javaloader.JavaLoader').init(jClass, false) />

<!--- Hex values for different extensions can be found in org.pegdown.Extensions.java (0x20 is for tables support) --->
<cfset variables.pegdown = javaloader.create("org.pegdown.PegDownProcessor").init(javaCast("int", InputBaseN("0x20", 16))) />

<!--- Output the HTML conversion --->
<cfoutput>#variables.pegdown.markdownToHtml(markdownString)#</cfoutput>

Answer 1

你得到的错误是因为PegDown的依赖 - parboiled的分布方式。

这是一个scala项目，它会生成多个JAR。你所拥有的精简核心jar似乎只有核心算法和Scala语言API。

要使用Java API，您还需要获取提供绑定的parboiled-java库（包括上面例外中提到的BaseParser类）。 GitHub repo只有1.1.4文件，但这里有1.1.3 jar的副本：http://mirrors.ibiblio.org/maven2/org/parboiled/parboiled-java/1.1.3/parboiled-java-1.1.3.jar

如果您下载并将其添加到您正在递送到JavaLoader的jar文件数组中，那么您应该没问题。

Coldfusion 9中的Markdown处理，具有表扩展支持

对于pegdown

对于showdownjs：

栈跟踪

更新

CF9的工作代码（在JRUN / Linux上运行）

1 个答案: