EL1004E: Method call: Method fmtdate(java.util.Date,java.lang.String) cannot be found on org.thymele

使用springboot与thymeleaf整合时，发现java8中关于时间的字段LocalDateTime在前台使用dates.format会报错。

<tr>
   <td>秒杀开始时间</td>
   <td th:text="${#dates.format(goods.startDate, 'yyyy-MM-dd HH:mm:ss')}"></td>
</tr>

报错信息：

org.springframework.expression.spel.SpelEvaluationException: EL1004E: Method call: Method format(java.time.LocalDateTime,java.lang.String) cannot be found on type org.thymeleaf.expression.Dates
    at org.springframework.expression.spel.ast.MethodReference.findAccessorForMethod(MethodReference.java:226) ~[spring-expression-5.3.12.jar:5.3.12]
    at org.springframework.expression.spel.ast.MethodReference.getValueInternal(MethodReference.java:135) ~[spring-expression-5.3.12.jar:5.3.12]
    at org.springframework.expression.spel.ast.MethodReference.access$000(MethodReference.java:55) ~[spring-expression-5.3.12.jar:5.3.12]
    at org.springframework.expression.spel.ast.MethodReference$MethodValueRef.getValue(MethodReference.java:387) ~[spring-expression-5.3.12.jar:5.3.12]
    at org.springframework.expression.spel.ast.CompoundExpression.getValueInternal(CompoundExpression.java:92) ~[spring-expression-5.3.12.jar:5.3.12]
    at org.springframework.expression.spel.ast.SpelNodeImpl.getValue(SpelNodeImpl.java:112) ~[spring-expression-5.3.12.jar:5.3.12]
    at org.springframework.expression.spel.standard.SpelExpression.getValue(SpelExpression.java:337) ~[spring-expression-5.3.12.jar:5.3.12]
    at org.thymeleaf.spring5.expression.SPELVariableExpressionEvaluator.evaluate(SPELVariableExpressionEvaluator.java:265) ~[thymeleaf-spring5-3.0.12.RELEASE.jar:3.0.12.RELEASE]
    at org.thymeleaf.standard.expression.VariableExpression.executeVariableExpression(VariableExpression.java:166) ~[thymeleaf-3.0.12.RELEASE.jar:3.0.12.RELEASE]
    at org.thymeleaf.standard.expression.SimpleExpression.executeSimple(SimpleExpression.java:66) ~[thymeleaf-3.0.12.RELEASE.jar:3.0.12.RELEASE]
    at org.thymeleaf.standard.expression.Expression.execute(Expression.java:109) ~[thymeleaf-3.0.12.RELEASE.jar:3.0.12.RELEASE]
    at org.thymeleaf.standard.expression.Expression.execute(Expression.java:138) ~[thymeleaf-3.0.12.RELEASE.jar:3.0.12.RELEASE]
    at org.thymeleaf.standard.processor.AbstractStandardExpressionAttributeTagProcessor.doProcess(AbstractStandardExpressionAttributeTagProcessor.java:144) ~[thymeleaf-3.0.12.RELEASE.jar:3.0.12.RELEASE]
    at org.thymeleaf.processor.element.AbstractAttributeTagProcessor.doProcess(AbstractAttributeTagProcessor.java:74) ~[thymeleaf-3.0.12.RELEASE.jar:3.0.12.RELEASE]
    at org.thymeleaf.processor.element.AbstractElementTagProcessor.process(AbstractElementTagProcessor.java:95) ~[thymeleaf-3.0.12.RELEASE.jar:3.0.12.RELEASE]
    at org.thymeleaf.util.ProcessorConfigurationUtils$ElementTagProcessorWrapper.process(ProcessorConfigurationUtils.java:633) ~[thymeleaf-3.0.12.RELEASE.jar:3.0.12.RELEASE]
    at org.thymeleaf.engine.ProcessorTemplateHandler.handleOpenElement(ProcessorTemplateHandler.java:1314) ~[thymeleaf-3.0.12.RELEASE.jar:3.0.12.RELEASE]
    at org.thymeleaf.engine.TemplateHandlerAdapterMarkupHandler.handleOpenElementEnd(TemplateHandlerAdapterMarkupHandler.java:304) ~[thymeleaf-3.0.12.RELEASE.jar:3.0.12.RELEASE]
    at org.thymeleaf.templateparser.markup.InlinedOutputExpressionMarkupHandler$InlineMarkupAdapterPreProcessorHandler.handleOpenElementEnd(InlinedOutputExpressionMarkupHandler.java:278) ~[thymeleaf-3.0.12.RELEASE.jar:3.0

解决方案：

查找相关资料，发现thymeleaf对于此类报错，增加了一个增强包，maven工程中需要在pom中引入如下包：

<dependency>
    <groupId>org.thymeleaf.extras</groupId>
    <artifactId>thymeleaf-extras-java8time</artifactId>
</dependency>

然后将thymeleaf中的代码改为如下即可：

<tr>
    <td>秒杀开始时间</td>
    <td th:text="${#temporals.format(goods.startDate,'yyyy-MM-dd HH:mm:ss')}"></td>
</tr>