• freemarker报错之十四


    1、错误描述

    <html>
      <head>
        <meta http-equiv="content-type" content="text/html; charset=UTF-8">
        <title>freemarker处理哈希表的内建函数</title>
    
      </head>
      
      <body>
         	 张三强
    	 
    
    Expected collection or sequence. maps evaluated instead to freemarker.core.HashLiteral$SequenceHash on line 13, column 17 in map.ftl.
    The problematic instruction:
    ----------
    ==> list maps as map [on line 13, column 10 in map.ftl]
    ----------
    
    Java backtrace for programmers:
    ----------
    freemarker.template.TemplateException: Expected collection or sequence. maps evaluated instead to freemarker.core.HashLiteral$SequenceHash on line 13, column 17 in map.ftl.
    	at freemarker.core.TemplateObject.invalidTypeException(TemplateObject.java:136)
    	at freemarker.core.IteratorBlock$Context.runLoop(IteratorBlock.java:190)
    	at freemarker.core.Environment.visit(Environment.java:428)
    	at freemarker.core.IteratorBlock.accept(IteratorBlock.java:102)
    	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:210)
    	at com.you.test.freemarker.FreemarkerTest.testMap(FreemarkerTest.java:197)
    	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$2.evaluate(ParentRunner.java:222)
    	at org.junit.runners.ParentRunner.run(ParentRunner.java:300)
    	at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
    	at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
    	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
    	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
    	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
    	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
    六月 04, 2014 10:52:14 下午 freemarker.log.JDK14LoggerFactory$JDK14Logger error
    严重: Template processing error: "Expected collection or sequence. maps evaluated instead to freemarker.core.HashLiteral$SequenceHash on line 13, column 17 in map.ftl."
    
    Expected collection or sequence. maps evaluated instead to freemarker.core.HashLiteral$SequenceHash on line 13, column 17 in map.ftl.
    The problematic instruction:
    ----------
    ==> list maps as map [on line 13, column 10 in map.ftl]
    ----------
    
    Java backtrace for programmers:
    ----------
    freemarker.template.TemplateException: Expected collection or sequence. maps evaluated instead to freemarker.core.HashLiteral$SequenceHash on line 13, column 17 in map.ftl.
    	at freemarker.core.TemplateObject.invalidTypeException(TemplateObject.java:136)
    	at freemarker.core.IteratorBlock$Context.runLoop(IteratorBlock.java:190)
    	at freemarker.core.Environment.visit(Environment.java:428)
    	at freemarker.core.IteratorBlock.accept(IteratorBlock.java:102)
    	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:210)
    	at com.you.test.freemarker.FreemarkerTest.testMap(FreemarkerTest.java:197)
    	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)
    
    
    Expected collection or sequence. maps evaluated instead to freemarker.core.HashLiteral$SequenceHash on line 13, column 17 in map.ftl.
    The problematic instruction:
    ----------
    ==> list maps as map [on line 13, column 10 in map.ftl]
    ----------
    
    Java backtrace for programmers:
    ----------
    freemarker.template.TemplateException: Expected collection or sequence. maps evaluated instead to freemarker.core.HashLiteral$SequenceHash on line 13, column 17 in map.ftl.
    	at freemarker.core.TemplateObject.invalidTypeException(TemplateObject.java:136)
    	at freemarker.core.IteratorBlock$Context.runLoop(IteratorBlock.java:190)
    	at freemarker.core.Environment.visit(Environment.java:428)
    	at freemarker.core.IteratorBlock.accept(IteratorBlock.java:102)
    	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:210)
    	at com.you.test.freemarker.FreemarkerTest.testMap(FreemarkerTest.java:197)
    	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

        maps不是一个序列,不能用list遍历map

     <#--freemarker HashMap取值-->
    <#assign maps={"1":"张三丰","2":"李思思","3":"张三强","4":"王五"}>
    ${maps["3"]}
    	 
    <#list maps as map>
     ${map}
    </#list>

    3、解决办法

        先获取map中的key值,再通过key值序列遍历map

    <#--freemarker HashMap取值-->
    	 <#assign maps={"1":"张三丰","2":"李思思","3":"张三强","4":"王五"}>
    	 ${maps["3"]}
    	 
    	 <#assign keys=maps?keys>
    	 <#list keys as key>
    	    ${key}----${maps[key]}
    	 </#list>


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  • 原文地址:https://www.cnblogs.com/hzcya1995/p/13315050.html
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