gsp中的grailsApplication.controllerClasses過濾器

Question

我在stackoverflow中搜索grailsApplication.controllerClasses過濾器，我按照正確的答案。

我寫這樣的代碼。

<g:each var="c" in="${grailsApplication.controllerClasses.each{GrailsClassUtils.isClassBelowPackage(it.clazz, ['com.posplus.product']) }.sort{ it.fullName } }"> 
     <li> 
     <g:link controller="${c.logicalPropertyName}" action="list" data-pjax='#main'> 
        <g:message code="${c.logicalPropertyName}.label" default="${c.logicalPropertyName}"/> 
     </g:link> 
     </li> 
</g:each> 

它會導致錯誤堆棧

org.codehaus.groovy.grails.web.pages.exceptions.GroovyPagesException: Error applying layout : bootstrap 
    java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) 
    java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) 
    java.lang.Thread.run(Thread.java:680) 
root cause 

org.codehaus.groovy.grails.web.pages.exceptions.GroovyPagesException: Error processing GroovyPageView: Error executing tag <g:include>: Unable to execute include: Request processing failed; nested exception is org.codehaus.groovy.grails.web.pages.exceptions.GroovyPagesException: Error evaluating expression [grailsApplication.controllerClasses.each{GrailsClassUtils.isClassBelowPackage(it.clazz, ['com.posplus.product']) }.sort{ it.fullName }] on line [13]: null 
    java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) 
    java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) 
    java.lang.Thread.run(Thread.java:680) 
root cause 

org.codehaus.groovy.grails.web.taglib.exceptions.GrailsTagException: Error executing tag <g:include>: Unable to execute include: Request processing failed; nested exception is org.codehaus.groovy.grails.web.pages.exceptions.GroovyPagesException: Error evaluating expression [grailsApplication.controllerClasses.each{GrailsClassUtils.isClassBelowPackage(it.clazz, ['com.posplus.product']) }.sort{ it.fullName }] on line [13]: null 
    Users_wenhaoliu_Documents_workspace_posplus_grails_app_views_layouts_bootstrap_gsp$_run_closure2.doCall(bootstrap.gsp:13) 
    Users_wenhaoliu_Documents_workspace_posplus_grails_app_views_layouts_bootstrap_gsp.run(bootstrap.gsp:21) 
    java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) 
    java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) 
    java.lang.Thread.run(Thread.java:680) 
root cause 

org.codehaus.groovy.grails.web.servlet.mvc.exceptions.ControllerExecutionException: Unable to execute include: Request processing failed; nested exception is org.codehaus.groovy.grails.web.pages.exceptions.GroovyPagesException: Error evaluating expression [grailsApplication.controllerClasses.each{GrailsClassUtils.isClassBelowPackage(it.clazz, ['com.posplus.product']) }.sort{ it.fullName }] on line [13]: null 
    Users_wenhaoliu_Documents_workspace_posplus_grails_app_views_layouts_bootstrap_gsp$_run_closure2.doCall(bootstrap.gsp:13) 
    Users_wenhaoliu_Documents_workspace_posplus_grails_app_views_layouts_bootstrap_gsp.run(bootstrap.gsp:21) 
    java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) 
    java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) 
    java.lang.Thread.run(Thread.java:680) 
root cause 

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.codehaus.groovy.grails.web.pages.exceptions.GroovyPagesException: Error evaluating expression [grailsApplication.controllerClasses.each{GrailsClassUtils.isClassBelowPackage(it.clazz, ['com.posplus.product']) }.sort{ it.fullName }] on line [13]: null 
    Users_wenhaoliu_Documents_workspace_posplus_grails_app_views_layouts_bootstrap_gsp$_run_closure2.doCall(bootstrap.gsp:13) 
    Users_wenhaoliu_Documents_workspace_posplus_grails_app_views_layouts_bootstrap_gsp.run(bootstrap.gsp:21) 
    java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) 
    java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) 
    java.lang.Thread.run(Thread.java:680) 
root cause 

org.codehaus.groovy.grails.web.pages.exceptions.GroovyPagesException: Error evaluating expression [grailsApplication.controllerClasses.each{GrailsClassUtils.isClassBelowPackage(it.clazz, ['com.posplus.product']) }.sort{ it.fullName }] on line [13]: null 
    Users_wenhaoliu_Documents_workspace_posplus_grails_app_views_includes_subnav_gsp.run(subnav.gsp:13) 
    Users_wenhaoliu_Documents_workspace_posplus_grails_app_views_layouts_bootstrap_gsp$_run_closure2.doCall(bootstrap.gsp:13) 
    Users_wenhaoliu_Documents_workspace_posplus_grails_app_views_layouts_bootstrap_gsp.run(bootstrap.gsp:21) 
    java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) 
    java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) 
    java.lang.Thread.run(Thread.java:680) 
root cause 

java.lang.NullPointerException 
    Users_wenhaoliu_Documents_workspace_posplus_grails_app_views_includes_subnav_gsp$_run_closure3_closure8.doCall(subnav.gsp:13) 
    Users_wenhaoliu_Documents_workspace_posplus_grails_app_views_includes_subnav_gsp$_run_closure3.doCall(subnav.gsp:13) 
    Users_wenhaoliu_Documents_workspace_posplus_grails_app_views_includes_subnav_gsp.run(subnav.gsp:13) 
    Users_wenhaoliu_Documents_workspace_posplus_grails_app_views_layouts_bootstrap_gsp$_run_closure2.doCall(bootstrap.gsp:13) 
    Users_wenhaoliu_Documents_workspace_posplus_grails_app_views_layouts_bootstrap_gsp.run(bootstrap.gsp:21) 
    java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) 
    java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) 
    java.lang.Thread.run(Thread.java:680) 

，但如果我改變代碼

<g:each var="c" in="${grailsApplication.controllerClasses.each{GrailsClassUtils.isClassBelowPackage(it.class, ['com.posplus.product']) }.sort{ it.fullName } }"> 
     <li> 
      <g:link controller="${c.logicalPropertyName}" action="list" data-pjax='#main'> 
        <g:message code="${c.logicalPropertyName}.label" default="${c.logicalPropertyName}"/> 
      </g:link> 
     </li> 
</g:each> 

它列出所有的控制器。這裏有什麼錯？

Answer 1

我處理那個，因爲GrailsClassUtils.isClassBelowPackage不能處理非包類。我寫了一個函數來解決這個問題。

public static boolean isClassBelowPackage(Class<?> theClass, List<?> packageList) { 
    if(theClass.package==null)return false 
    String classPackage = theClass.package.name; 
    for (Object packageName : packageList) { 
     if (packageName != null) { 
      if (classPackage.startsWith(packageName.toString())) { 
       return true; 
      } 
     } 
    } 
    return false; 
} 

在GSP

是：

<g:each var="c" in="${grailsApplication.controllerClasses.findAll{MyGrailsClassUtils.isClassBelowPackage(it.clazz, ['com.posplus.product']) }.sort{ it.fullName } }"> 
     <li> 
     <g:link controller="${c.logicalPropertyName}" action="list" data-pjax='#main'> 
        <g:message code="${c.logicalPropertyName}.label" default="${c.logicalPropertyName}"/> 
     </g:link> 
     </li> 
</g:each> 

Answer 2

雖然我相信你的答案是工作就好了，我不明白，爲什麼你不使用原始GrailsClassUtils。所有你需要做的就是導入它們。

這就是我所做的，它的工作原理非常完美。

這不是我打算回覆使用的答案，但由於缺乏聲譽，我不得不。