gsp中的grailsApplication.ControllerClass过滤器

我在stackoverflow中搜索grailsApplication.controllerClasses过滤器，并遵循正确答案

我写这样的代码

  <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>

它会导致错误堆栈

    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)

但是如果我把代码改成

<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>

---

它列出了所有控制器。这里的错误是什么？

我处理这个问题。因为grailClassUtils.isClassBelowPackage无法处理非包类。我编写了一个函数来解决这个问题

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;
}

在普惠制中：

<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>

---

虽然我确信您的答案很好，但我不明白您为什么不使用原始的GrailsClassUtils。您所需要做的就是导入它们

我就是这么做的，而且效果非常好

---

我不打算用答案回答，但由于缺乏声誉，我不得不这样做。

检查这个答案嗨。我在提问之前已经阅读了答案。你有没有试过我的代码或看一下。当我使用它时。clazz，引起nullpointexception。我知道了原因。我有一个类是没有包的，所以它会引起nullpointexception。askwer是对的！谢谢。在5年前的版本中，版本没有处理这个问题。也可以说我们有一个bug！我想是的，这是固定在你的版本上的。