Question

我在stackoverflow中搜索grailsApplication.controllerClasses过滤器，然后我按照正确的答案。

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>

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)

但如果我将代码更改为

<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>

列出所有控制器。这有什么问题？

Answer 1

我处理那个。因为GrailsClassUtils.isClassBelowPackage无法处理非包类。我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;
}

gsp中的

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

虽然我确信您的答案工作得很好，但我无法理解为什么您没有使用原始GrailsClassUtils。您需要做的就是导入它们。

这就是我所做的，而且它的工作非常完美。

我不打算使用答案回复，但由于缺乏声誉，我必须这样做。

gils中的grailsApplication.controllerClasses过滤器

2 个答案: