freemarker自定义标签

1、错误描述

 六月 05, 2014 11:31:35 下午 freemarker.log.JDK14LoggerFactory$JDK14Logger error
 严重: Template processing error: "Error executing macro: write\nrequired parameter: nums is not specified."

 Error executing macro: write
 required parameter: nums is not specified.
 The problematic instruction:
 ----------
 ==> macro write [on line 11, column 10 in myself.ftl]
  in user-directive write [on line 18, column 10 in myself.ftl]
 ----------

 Java backtrace for programmers:
 ----------
 freemarker.template.TemplateException: Error executing macro: write
 required parameter: nums is not specified.
     at freemarker.core.Macro$Context.sanityCheck(Macro.java:211)
     at freemarker.core.Macro$Context.runMacro(Macro.java:169)
     at freemarker.core.Environment.visit(Environment.java:614)
     at freemarker.core.UnifiedCall.accept(UnifiedCall.java:106)
     at freemarker.core.Environment.visit(Environment.java:221)
     at freemarker.core.MixedContent.accept(MixedContent.java:92)
     at freemarker.core.Environment.visit(Environment.java:221)
     at freemarker.core.Environment.process(Environment.java:199)
     at freemarker.template.Template.process(Template.java:259)
     at com.you.freemarker.FreemarkerTemplate.printFtl(FreemarkerTemplate.java:77)
     at com.you.test.freemarker.FreemarkerTest.studentPrint(FreemarkerTest.java:217)
     at com.you.test.freemarker.FreemarkerTest.testMyself(FreemarkerTest.java:204)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
     at java.lang.reflect.Method.invoke(Unknown Source)
     at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45)
     at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
     at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42)
     at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
     at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
     at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263)
     at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:68)
     at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47)
     at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)
     at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)
     at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)
     at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)
     at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)
     at org.junit.runners.ParentRunner.run(ParentRunner.java:300)
     at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
     at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

 <html>
   <head>
     <meta http-equiv="content-type" content="text/html; charset=UTF-8">
     <title>freemarker自定义标签</title>

   </head>

   <body>

 Error executing macro: write
 required parameter: nums is not specified.
 The problematic instruction:
 ----------
 ==> macro write [on line 11, column 10 in myself.ftl]
  in user-directive write [on line 18, column 10 in myself.ftl]
 ----------

 Java backtrace for programmers:
 ----------
 freemarker.template.TemplateException: Error executing macro: write
 required parameter: nums is not specified.
     at freemarker.core.Macro$Context.sanityCheck(Macro.java:211)
     at freemarker.core.Macro$Context.runMacro(Macro.java:169)
     at freemarker.core.Environment.visit(Environment.java:614)
     at freemarker.core.UnifiedCall.accept(UnifiedCall.java:106)
     at freemarker.core.Environment.visit(Environment.java:221)
     at freemarker.core.MixedContent.accept(MixedContent.java:92)
     at freemarker.core.Environment.visit(Environment.java:221)
     at freemarker.core.Environment.process(Environment.java:199)
     at freemarker.template.Template.process(Template.java:259)
     at com.you.freemarker.FreemarkerTemplate.printFtl(FreemarkerTemplate.java:77)
     at com.you.test.freemarker.FreemarkerTest.studentPrint(FreemarkerTest.java:217)
     at com.you.test.freemarker.FreemarkerTest.testMyself(FreemarkerTest.java:204)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
     at java.lang.reflect.Method.invoke(Unknown Source)
     at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45)
     at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
     at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42)
     at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
     at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
     at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263)
     at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:68)
     at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47)
     at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)
     at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)
     at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)
     at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)
     at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)
     at org.junit.runners.ParentRunner.run(ParentRunner.java:300)
     at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
     at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

 Error executing macro: write
 required parameter: nums is not specified.
 The problematic instruction:
 ----------
 ==> macro write [on line 11, column 10 in myself.ftl]
  in user-directive write [on line 18, column 10 in myself.ftl]
 ----------

 Java backtrace for programmers:
 ----------
 freemarker.template.TemplateException: Error executing macro: write
 required parameter: nums is not specified.
     at freemarker.core.Macro$Context.sanityCheck(Macro.java:211)
     at freemarker.core.Macro$Context.runMacro(Macro.java:169)
     at freemarker.core.Environment.visit(Environment.java:614)
     at freemarker.core.UnifiedCall.accept(UnifiedCall.java:106)
     at freemarker.core.Environment.visit(Environment.java:221)
     at freemarker.core.MixedContent.accept(MixedContent.java:92)
     at freemarker.core.Environment.visit(Environment.java:221)
     at freemarker.core.Environment.process(Environment.java:199)
     at freemarker.template.Template.process(Template.java:259)
     at com.you.freemarker.FreemarkerTemplate.printFtl(FreemarkerTemplate.java:77)
     at com.you.test.freemarker.FreemarkerTest.studentPrint(FreemarkerTest.java:217)
     at com.you.test.freemarker.FreemarkerTest.testMyself(FreemarkerTest.java:204)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
     at java.lang.reflect.Method.invoke(Unknown Source)
     at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45)
     at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
     at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42)
     at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
     at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
     at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263)
     at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:68)
     at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47)
     at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)
     at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)
     at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)
     at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)
     at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)
     at org.junit.runners.ParentRunner.run(ParentRunner.java:300)
     at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
     at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

2、错误原因

 <#--freemarker自定义标签-->
      <#--对于write自定义标签有两个参数，nums是次数，name是名称-->
      <#macro write nums name>
          <#list 1..nums as num>
                        姓名：张三丰
                        性别：男
          </#list>
      </#macro>

      <@write/>

由于write自定义标签有两个参数，在调用它的时候需要给两个参数指定值，否则报错

3、解决办法

 <@write nums=4 name="你好！"/>

给两个参数赋值

 <html>
   <head>
     <meta http-equiv="content-type" content="text/html; charset=UTF-8">
     <title>freemarker自定义标签</title>

   </head>

   <body>
      <#--freemarker自定义标签-->
      <#--对于write自定义标签有两个参数，nums是次数，name是名称-->
      <#macro write nums name>
          <#list 1..nums as num>
                        姓名：张三丰
                        性别：男
          </#list>
      </#macro>

      <@write nums=4 name="你好！"/>
   </body>
 </html>

运行结果：

 <html>
   <head>
     <meta http-equiv="content-type" content="text/html; charset=UTF-8">
     <title>freemarker自定义标签</title>

   </head>

   <body>

                        姓名：张三丰
                        性别：男
                        姓名：张三丰
                        性别：男
                        姓名：张三丰
                        性别：男
                        姓名：张三丰
                        性别：男
   </body>
 </html>

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