freemarker错误九

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1、错误叙述性说明

五月 30, 2014 11:52:04 下午 freemarker.log.JDK14LoggerFactory$JDK14Logger error
严重: Template processing error: "Can't convert the date to string, because it is not known which parts of the date variable are in use. Use ?date, ?time or ?datetime built-in, or ?string.\u003Cformat> or ?string(format) built-in with this date."

Can't convert the date to string, because it is not known which parts of the date variable are in use. Use ?
date, ?time or ?datetime built-in, or ?
string.<format> or ?string(format) built-in with this date.The problematic instruction:----------==> ${nowsday} [on line 23, column 6 in type.ftl]----------Java backtrace for programmers:----------freemarker.template.TemplateModelException: Can't convert the date to string, because it is not known which parts of the date variable are in use. Use ?date, ?
time or ?datetime built-in, or ?string.<format> or ?string(format) built-in with this date.	at freemarker.core.Environment.formatDate(Environment.java:776)	at freemarker.core.Expression.getStringValue(Expression.java:105)	at freemarker.core.Expression.getStringValue(Expression.java:93)	at freemarker.core.DollarVariable.accept(DollarVariable.java:76)	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:173)	at com.you.test.freemarker.FreemarkerTest.testDataType(FreemarkerTest.java:160)	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基本数据类型</title>  </head>    <body>          张三丰          123,456          true     false          Can't convert the date to string, because it is not known which parts of the date variable are in use. Use ?
date, ?
time or ?
datetime built-in, or ?
string.<format> or ?string(format) built-in with this date.The problematic instruction:----------==> ${nowsday} [on line 23, column 6 in type.ftl]----------Java backtrace for programmers:----------freemarker.template.TemplateModelException: Can't convert the date to string, because it is not known which parts of the date variable are in use. Use ?
date, ?
time or ?datetime built-in, or ?string.<format> or ?string(format) built-in with this date.	at freemarker.core.Environment.formatDate(Environment.java:776)	at freemarker.core.Expression.getStringValue(Expression.java:105)	at freemarker.core.Expression.getStringValue(Expression.java:93)	at freemarker.core.DollarVariable.accept(DollarVariable.java:76)	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:173)	at com.you.test.freemarker.FreemarkerTest.testDataType(FreemarkerTest.java:160)	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)Can't convert the date to string, because it is not known which parts of the date variable are in use. Use ?date, ?
time or ?datetime built-in, or ?string.<format> or ?string(format) built-in with this date.The problematic instruction:----------==> ${nowsday} [on line 23, column 6 in type.ftl]----------Java backtrace for programmers:----------freemarker.template.TemplateModelException: Can't convert the date to string, because it is not known which parts of the date variable are in use. Use ?
date, ?time or ?
datetime built-in, or ?string.<format> or ?string(format) built-in with this date.	at freemarker.core.Environment.formatDate(Environment.java:776)	at freemarker.core.Expression.getStringValue(Expression.java:105)	at freemarker.core.Expression.getStringValue(Expression.java:93)	at freemarker.core.DollarVariable.accept(DollarVariable.java:76)	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:173)	at com.you.test.freemarker.FreemarkerTest.testDataType(FreemarkerTest.java:160)	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基本数据类型
	 * @Title:testDataType
	 * @Description:
	 * @param:
	 * @return: void
	 * @throws
	 */
	@Test
	public void testDataType()
	{
		root.put("nowsday", new Date());
		studentPrint("type.ftl");
	}

${nowsday}

不能将日期类型直接转换为字符串。由于不知道是日期类型中的哪一种在使用。是date、time还是datetime。而且不知道转换成字符串日期究竟显示成什么格式，是yyyy-MM-dd。还是HH:mm:ss，还是yyyy-MM-dd HH:mm:ss

3、解决的方法

 <#--日期类型-->
${nowsday?string("yyyy-MM-dd")}

结果：2014-05-31

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