Question

我有一个包含这样的地图的列表：

Map<String, Long> count = new HashMap<>();
count.put("totalMessageCount", 5L);         
Map<String, Map<String, Long>> names = new HashMap<>();
names.put("someKey", count);
List<Map<String, Map<String, Long>>> list = new ArrayList<>();
list.add(names);

我正在将此列表从控制器发送到视图。

我已经尝试过了：

<table>
        <tr th:each="element : ${list}">
        <td th:text="${element.key}"></td>
        <td th:text="${element.value}"></td>
</table>

我得到一个错误：

org.springframework.expression.spel.SpelEvaluationException：EL1008E：在类型'java.util.HashMap'的对象上找不到属性或字段'key'-可能不是公共的或无效的吗？在org.springframework.expression.spel.ast.PropertyOrFieldReference.readProperty（PropertyOrFieldReference.java:217）在org.springframework.expression.spel.ast.PropertyOrFieldReference.getValueInternal（PropertyOrFieldReference.java:104）在org.springframework.expression.spel.ast.PropertyOrFieldReference.access处$ 000（PropertyOrFieldReference.java:51）在org.springframework.expression.spel.ast.PropertyOrFieldReference $ AccessorLValue.getValue（PropertyOrFieldReference.java:406）在org.springframework.expression.spel.ast.CompoundExpression.getValueInternal（CompoundExpression.java:90）在org.springframework.expression.spel.ast.SpelNodeImpl.getValue（SpelNodeImpl.java:109）在org.springframework.expression.spel.standard.SpelExpression.getValue（SpelExpression.java:328）在org.thymeleaf.spring5.expression.SPELVariableExpressionEvaluator.evaluate（SPELVariableExpressionEvaluator.java:263）在org.thymeleaf.standard.expression.VariableExpression.executeVariableExpression（VariableExpression.java:166）在org.thymeleaf.standard.expression.SimpleExpression.executeSimple（SimpleExpression.java:66）在org.thymeleaf.standard.expression.Expression.execute（Expression.java:109）在org.thymeleaf.standard.expression.AdditionExpression.executeAddition（AdditionExpression.java:96）在org.thymeleaf.standard.expression.ComplexExpression.executeComplex（ComplexExpression.java:62）在org.thymeleaf.standard.expression.Expression.execute（Expression.java:112）在org.thymeleaf.standard.expression.Expression.execute（Expression.java:138）在org.thymeleaf.standard.processor.AbstractStandardExpressionAttributeTagProcessor.doProcess（AbstractStandardExpressionAttributeTagProcessor.java:144）在org.thymeleaf.processor.element.AbstractAttributeTagProcessor.doProcess（AbstractAttributeTagProcessor.java:74）在org.thymeleaf.processor.element.AbstractElementTagProcessor.process（AbstractElementTagProcessor.java:95）在org.thymeleaf.util.ProcessorConfigurationUtils $ ElementTagProcessorWrapper.process（ProcessorConfigurationUtils.java:633）在org.thymeleaf.engine.ProcessorTemplateHandler.handleOpenElement（ProcessorTemplateHandler.java:1314）在org.thymeleaf.engine.OpenElementTag.beHandled（OpenElementTag.java:205）在org.thymeleaf.engine.Model.process（Model.java:282）在org.thymeleaf.engine.Model.process（Model.java:290）在org.thymeleaf.engine.IteratedGatheringModelProcessable.processIterationModel（IteratedGatheringModelProcessable.java:367）在org.thymeleaf.engine.IteratedGatheringModelProcessable.process（IteratedGatheringModelProcessable.java:221）处在org.thymeleaf.engine.ProcessorTemplateHandler.handleCloseElement（ProcessorTemplateHandler.java:1640）在org.thymeleaf.engine.CloseElementTag.beHandled（CloseElementTag.java:139）在org.thymeleaf.engine.Model.process（Model.java:282）在org.thymeleaf.engine.Model.process（Model.java:290）在org.thymeleaf.engine.IteratedGatheringModelProcessable.processIterationModel（IteratedGatheringModelProcessable.java:367）在org.thymeleaf.engine.IteratedGatheringModelProcessable.process（IteratedGatheringModelProcessable.java:221）处在org.thymeleaf.engine.ProcessorTemplateHandler.handleCloseElement（ProcessorTemplateHandler.java:1640）在org.thymeleaf.engine.CloseElementTag.beHandled（CloseElementTag.java:139）在org.thymeleaf.engine.Model.process（Model.java:282）在org.thymeleaf.engine.Model.process（Model.java:290）在org.thymeleaf.engine.IteratedGatheringModelProcessable.processIterationModel（IteratedGatheringModelProcessable.java:367）在org.thymeleaf.engine.IteratedGatheringModelProcessable.process（IteratedGatheringModelProcessable.java:221）处在org.thymeleaf.engine.ProcessorTemplateHandler.handleCloseElement（ProcessorTemplateHandler.java:1640）在org.thymeleaf.engine.CloseElementTag.beHandled（CloseElementTag.java:139）在org.thymeleaf.engine.TemplateModel.process（TemplateModel.java:136）在org.thymeleaf.engine.TemplateManager.parseAndProcess（TemplateManager.java:661）在org.thymeleaf.TemplateEngine.process（TemplateEngine.java:1098）在org.thymeleaf.TemplateEngine.process（TemplateEngine.java:1072）在org.thymeleaf.spring5.view.ThymeleafView.renderFragment（ThymeleafView.java:362）在org.thymeleaf.spring5.view.ThymeleafView.render（ThymeleafView.java:189）在org.springframework.web.servlet.DispatcherServlet.render（DispatcherServlet.java:1370）在org.springframework.web.servlet.DispatcherServlet.processDispatchResult（DispatcherServlet.java:1116）在org.springframework.web.servlet.DispatcherServlet.doDispatch（DispatcherServlet.java:1055）在org.springframework.web.servlet.DispatcherServlet.doService（DispatcherServlet.java:942）在org.springframework.web.servlet.FrameworkServlet.processRequest（FrameworkServlet.java:1005）在org.springframework.web.servlet.FrameworkServlet.doGet（FrameworkServlet.java:897）在javax.servlet.http.HttpServlet.service（HttpServlet.java:634）在org.springframework.web.servlet.FrameworkServlet.service（FrameworkServlet.java:882）在javax.servlet.http.HttpServlet.service（HttpServlet.java:741）在org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:231）在org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:166）在org.apache.tomcat.websocket.server.WsFilter.doFilter（WsFilter.java:53）在org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:193）在org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:166）在org.springframework.web.filter.RequestContextFilter.doFilterInternal（RequestContextFilter.java:99）在org.springframework.web.filter.OncePerRequestFilter.doFilter（OncePerRequestFilter.java:107）在org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:193）在org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:166）在org.springframework.web.filter.FormContentFilter.doFilterInternal（FormContentFilter.java:92）在org.springframework.web.filter.OncePerRequestFilter.doFilter（OncePerRequestFilter.java:107）在org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:193）在org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:166）在org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal（HiddenHttpMethodFilter.java:93）在org.springframework.web.filter.OncePerRequestFilter.doFilter（OncePerRequestFilter.java:107）在org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:193）在org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:166）在org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal（CharacterEncodingFilter.java:200）在org.springframework.web.filter.OncePerRequestFilter.doFilter（OncePerRequestFilter.java:107）在org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:193）在org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:166）在org.apache.catalina.core.StandardWrapperValve.invoke（StandardWrapperValve.java:200）在org.apache.catalina.core.StandardContextValve.invoke（StandardContextValve.java:96）在org.apache.catalina.authenticator.AuthenticatorBase.invoke（AuthenticatorBase.java:490）在org.apache.catalina.core.StandardHostValve.invoke（StandardHostValve.java:139）在org.apache.catalina.valves.ErrorReportValve.invoke（ErrorReportValve.java:92）在org.apache.catalina.core.StandardEngineValve.invoke（StandardEngineValve.java:74）在org.apache.catalina.valves.AbstractAccessLogValve.invoke（AbstractAccessLogValve.java:668）在org.apache.catalina.connector.CoyoteAdapter.service（CoyoteAdapter.java:343）在org.apache.coyote.http11.Http11Processor.service（Http11Processor.java:408）在org.apache.coyote.AbstractProcessorLight.process（AbstractProcessorLight.java:66）在org.apache.coyote.AbstractProtocol $ ConnectionHandler.process（AbstractProtocol.java:834）在org.apache.tomcat.util.net.NioEndpoint $ SocketProcessor.doRun（NioEndpoint.java:1415）在org.apache.tomcat.util.net.SocketProcessorBase.run（SocketProcessorBase.java:49）在java.base / java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1135）在java.base / java.util.concurrent.ThreadPoolExecutor $ Worker.run（ThreadPoolExecutor.java:635）在org.apache.tomcat.util.threads.TaskThread $ WrappingRunnable.run（TaskThread.java:61）在java.base / java.lang.Thread.run（Thread.java:844）

感谢您的帮助。

Answer 1

您很有可能需要另一层嵌套。

<table>
    <th:block th:each="map : ${list}">
       <tr th:each="e : ${map}">
          <td th:text="${e.key}"></td>
          <td th:text="${e.value}"></td>
       </tr>
    </th:block>
</table>

key和value是Map.Entry的属性。

遍历Thymeleaf中的地图列表

1 个答案: