如何使用 Thymeleaf 从集合中获取信息

【问题标题】：How do I get information from a collection using Thymeleaf如何使用 Thymeleaf 从集合中获取信息
【发布时间】：2014-01-10 13:28:02
【问题描述】：

我的控制器如下所示：

@ModelAttribute("adminMenu")
public Collection<Menu> getAdminMenu(HttpSession session, HttpServletRequest request) {
    Collection<Menu> menuCollection = this.stormfallService.findMenuByType("A", "A");
    log.debug("The collection for admin has " + menuCollection.size() + " records");
    session.setAttribute("adminMenu", menuCollection);
    /*Menu menu;
    Iterator<Menu> itr = menuCollection.iterator();
    while (itr.hasNext()) {
        menu = (Menu)itr.next();
        log.debug("The id = " + menu.getId());
        log.debug("The menu text is " + menu.getMenuText());
        log.debug("The menu type is " + menu.getMenuType());
        log.debug("The menu url is " + menu.getMenuUrl());
        log.debug("The menu sort order is " + menu.getSortOrder());
        log.debug("The menu status is " + menu.getStatus());
    }*/

    return menuCollection;
    //return null;
}

我认为这是正确的，但如果不是，请告诉我应该是什么。

我的片段如下所示：

<div th:fragment="sidebar" class="sidebar" id="textbar">
    <h4>Admin Functions</h4>
            <ul class="menu">
                    <!-- li th:each="menu,rowStat : ${adminMenu}" -->
                    <li th:each="menu,rowStat : #{session.adminMenu}">
                    <a href="#" th:href="${menu.menuUrl}" th:text="${menu.menuText}">Some Admin Text</a></li>
            </ul>
    <h4>User Functions</h4>
            <ul class="menu">
                    <!-- li th:each="menu,rowStat : ${userMenu}" -->
                    <li th:each="menu,rowStat : #{session.userMenu">
                    <a href="#" th:href="${menu.menuUrl}" th:text="${menu.menuText}">Some User Text</a></li>
            </ul>
    <h4>Tools</h4>
            <ul class="menu">
                <li><a href="#">Change Password</a></li>
                <li><a href="#">Logout</a></li>
            </ul>
</div>

当我不使用会话时，注释掉的代码会构建菜单，但是当它转到其他页面时，菜单就会消失。所以它需要在会话中。

我收到以下新代码错误：

HTTP 状态 500 - 请求处理失败；嵌套异常是 org.thymeleaf.exceptions.TemplateProcessingException：评估 SpringEL 表达式的异常：“menu.menuUrl”（布局：141）

输入异常报告

消息请求处理失败；嵌套异常是 org.thymeleaf.exceptions.TemplateProcessingException：评估 SpringEL 表达式的异常：“menu.menuUrl”（布局：141）

描述服务器遇到了一个内部错误，导致它无法完成这个请求。

exception

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.thymeleaf.exceptions.TemplateProcessingException: Exception evaluating SpringEL expression: "menu.menuUrl" (layout:141)
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:948)
    org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:827)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
    org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:812)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:77)
    org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)

root cause

org.thymeleaf.exceptions.TemplateProcessingException: Exception evaluating SpringEL expression: "menu.menuUrl" (layout:141)
    org.thymeleaf.spring3.expression.SpelVariableExpressionEvaluator.evaluate(SpelVariableExpressionEvaluator.java:153)
    org.thymeleaf.standard.expression.VariableExpression.executeVariable(VariableExpression.java:149)
    org.thymeleaf.standard.expression.SimpleExpression.executeSimple(SimpleExpression.java:59)
    org.thymeleaf.standard.expression.Expression.execute(Expression.java:103)
    org.thymeleaf.standard.expression.Expression.execute(Expression.java:133)
    org.thymeleaf.standard.expression.Expression.execute(Expression.java:120)
    org.thymeleaf.standard.processor.attr.AbstractStandardSingleAttributeModifierAttrProcessor.getTargetAttributeValue(AbstractStandardSingleAttributeModifierAttrProcessor.java:67)
    org.thymeleaf.spring3.processor.attr.SpringHrefAttrProcessor.getTargetAttributeValue(SpringHrefAttrProcessor.java:68)
    org.thymeleaf.processor.attr.AbstractSingleAttributeModifierAttrProcessor.getModifiedAttributeValues(AbstractSingleAttributeModifierAttrProcessor.java:59)
    org.thymeleaf.processor.attr.AbstractAttributeModifierAttrProcessor.processAttribute(AbstractAttributeModifierAttrProcessor.java:61)
    org.thymeleaf.processor.attr.AbstractAttrProcessor.doProcess(AbstractAttrProcessor.java:87)
    org.thymeleaf.processor.AbstractProcessor.process(AbstractProcessor.java:212)
    org.thymeleaf.dom.Node.applyNextProcessor(Node.java:973)
    org.thymeleaf.dom.Node.processNode(Node.java:928)
    org.thymeleaf.dom.NestableNode.computeNextChild(NestableNode.java:654)
    org.thymeleaf.dom.NestableNode.doAdditionalProcess(NestableNode.java:637)
    org.thymeleaf.dom.Node.processNode(Node.java:947)
    org.thymeleaf.dom.NestableNode.computeNextChild(NestableNode.java:654)
    org.thymeleaf.dom.NestableNode.doAdditionalProcess(NestableNode.java:637)
    org.thymeleaf.dom.Node.processNode(Node.java:947)
    org.thymeleaf.dom.NestableNode.computeNextChild(NestableNode.java:654)
    org.thymeleaf.dom.NestableNode.doAdditionalProcess(NestableNode.java:637)
    org.thymeleaf.dom.Node.processNode(Node.java:947)
    org.thymeleaf.dom.NestableNode.computeNextChild(NestableNode.java:654)
    org.thymeleaf.dom.NestableNode.doAdditionalProcess(NestableNode.java:637)
    org.thymeleaf.dom.Node.processNode(Node.java:947)
    org.thymeleaf.dom.NestableNode.computeNextChild(NestableNode.java:654)
    org.thymeleaf.dom.NestableNode.doAdditionalProcess(NestableNode.java:637)
    org.thymeleaf.dom.Node.processNode(Node.java:947)
    org.thymeleaf.dom.NestableNode.computeNextChild(NestableNode.java:654)
    org.thymeleaf.dom.NestableNode.doAdditionalProcess(NestableNode.java:637)
    org.thymeleaf.dom.Node.processNode(Node.java:947)
    org.thymeleaf.dom.NestableNode.computeNextChild(NestableNode.java:654)
    org.thymeleaf.dom.NestableNode.doAdditionalProcess(NestableNode.java:637)
    org.thymeleaf.dom.Node.processNode(Node.java:947)
    org.thymeleaf.dom.Document.process(Document.java:93)
    org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1155)
    org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1060)
    org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1011)
    org.thymeleaf.spring3.view.ThymeleafView.renderFragment(ThymeleafView.java:335)
    org.thymeleaf.spring3.view.ThymeleafView.render(ThymeleafView.java:190)
    org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1208)
    org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:992)
    org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:939)
    org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856)
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:936)
    org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:827)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
    org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:812)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:77)
    org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)

root cause

org.springframework.expression.spel.SpelEvaluationException: EL1008E:(pos 5): Field or property 'menuUrl' cannot be found on object of type 'java.lang.String'
    org.springframework.expression.spel.ast.PropertyOrFieldReference.readProperty(PropertyOrFieldReference.java:246)
    org.springframework.expression.spel.ast.PropertyOrFieldReference.getValueInternal(PropertyOrFieldReference.java:112)
    org.springframework.expression.spel.ast.PropertyOrFieldReference.access$000(PropertyOrFieldReference.java:43)
    org.springframework.expression.spel.ast.PropertyOrFieldReference$AccessorLValue.getValue(PropertyOrFieldReference.java:87)
    org.springframework.expression.spel.ast.CompoundExpression.getValueInternal(CompoundExpression.java:82)
    org.springframework.expression.spel.ast.SpelNodeImpl.getValue(SpelNodeImpl.java:93)
    org.springframework.expression.spel.standard.SpelExpression.getValue(SpelExpression.java:94)
    org.thymeleaf.spring3.expression.SpelVariableExpressionEvaluator.evaluate(SpelVariableExpressionEvaluator.java:138)
    org.thymeleaf.standard.expression.VariableExpression.executeVariable(VariableExpression.java:149)
    org.thymeleaf.standard.expression.SimpleExpression.executeSimple(SimpleExpression.java:59)
    org.thymeleaf.standard.expression.Expression.execute(Expression.java:103)
    org.thymeleaf.standard.expression.Expression.execute(Expression.java:133)
    org.thymeleaf.standard.expression.Expression.execute(Expression.java:120)
    org.thymeleaf.standard.processor.attr.AbstractStandardSingleAttributeModifierAttrProcessor.getTargetAttributeValue(AbstractStandardSingleAttributeModifierAttrProcessor.java:67)
    org.thymeleaf.spring3.processor.attr.SpringHrefAttrProcessor.getTargetAttributeValue(SpringHrefAttrProcessor.java:68)
    org.thymeleaf.processor.attr.AbstractSingleAttributeModifierAttrProcessor.getModifiedAttributeValues(AbstractSingleAttributeModifierAttrProcessor.java:59)
    org.thymeleaf.processor.attr.AbstractAttributeModifierAttrProcessor.processAttribute(AbstractAttributeModifierAttrProcessor.java:61)
    org.thymeleaf.processor.attr.AbstractAttrProcessor.doProcess(AbstractAttrProcessor.java:87)
    org.thymeleaf.processor.AbstractProcessor.process(AbstractProcessor.java:212)
    org.thymeleaf.dom.Node.applyNextProcessor(Node.java:973)
    org.thymeleaf.dom.Node.processNode(Node.java:928)
    org.thymeleaf.dom.NestableNode.computeNextChild(NestableNode.java:654)
    org.thymeleaf.dom.NestableNode.doAdditionalProcess(NestableNode.java:637)
    org.thymeleaf.dom.Node.processNode(Node.java:947)
    org.thymeleaf.dom.NestableNode.computeNextChild(NestableNode.java:654)
    org.thymeleaf.dom.NestableNode.doAdditionalProcess(NestableNode.java:637)
    org.thymeleaf.dom.Node.processNode(Node.java:947)
    org.thymeleaf.dom.NestableNode.computeNextChild(NestableNode.java:654)
    org.thymeleaf.dom.NestableNode.doAdditionalProcess(NestableNode.java:637)
    org.thymeleaf.dom.Node.processNode(Node.java:947)
    org.thymeleaf.dom.NestableNode.computeNextChild(NestableNode.java:654)
    org.thymeleaf.dom.NestableNode.doAdditionalProcess(NestableNode.java:637)
    org.thymeleaf.dom.Node.processNode(Node.java:947)
    org.thymeleaf.dom.NestableNode.computeNextChild(NestableNode.java:654)
    org.thymeleaf.dom.NestableNode.doAdditionalProcess(NestableNode.java:637)
    org.thymeleaf.dom.Node.processNode(Node.java:947)
    org.thymeleaf.dom.NestableNode.computeNextChild(NestableNode.java:654)
    org.thymeleaf.dom.NestableNode.doAdditionalProcess(NestableNode.java:637)
    org.thymeleaf.dom.Node.processNode(Node.java:947)
    org.thymeleaf.dom.NestableNode.computeNextChild(NestableNode.java:654)
    org.thymeleaf.dom.NestableNode.doAdditionalProcess(NestableNode.java:637)
    org.thymeleaf.dom.Node.processNode(Node.java:947)
    org.thymeleaf.dom.Document.process(Document.java:93)
    org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1155)
    org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1060)
    org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1011)
    org.thymeleaf.spring3.view.ThymeleafView.renderFragment(ThymeleafView.java:335)
    org.thymeleaf.spring3.view.ThymeleafView.render(ThymeleafView.java:190)
    org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1208)
    org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:992)
    org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:939)
    org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856)
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:936)
    org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:827)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
    org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:812)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:77)
    org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)

note The full stack trace of the root cause is available in the Apache Tomcat/7.0.42 logs.
Apache Tomcat/7.0.42

任何帮助将不胜感激。

【问题讨论】：

    标签： spring spring-mvc thymeleaf


    【解决方案1】：

    您正在使用#{...}（国际化）语法而不是${...} 语法。

    这也解释了下面的异常，因为#{...}的结果是String。

    Field or property 'menuUrl' cannot be found on object of type 'java.lang.String'

    将#{session.adminMenu} 和#{session.userMenu（注意缺少的}）分别更改为${session.adminMenu} 和${session.userMenu}。

    【讨论】：

    • 这有帮助，但现在我得到：类型异常报告消息请求处理失败；嵌套异常是 org.thymeleaf.exceptions.TemplateProcessingException: 无法解析为 each: "menu,rowStat : ${session.userMenu" (layout:146)
    猜你喜欢
    • 1970-01-01
    • 2020-07-21
    • 1970-01-01
    • 1970-01-01
    • 1970-01-01
    • 1970-01-01
    • 2020-02-25
    • 2021-05-31
    • 1970-01-01
    相关资源
    最近更新 更多
    热门标签
    Java Python linux javascript Mysql C# Docker 算法 前端 SpringBoot Redis Vue spring 设计模式 .net core .net kubernetes c++ 数据库 数据结构 大数据 js 机器学习 微服务 Android Go 程序员 面试 JVM ASP.net core 云原生 人工智能 后端 PHP git CSS golang k8s Nginx Django mybatis 深度学习 多线程 React 架构 devops 爬虫 云计算 Spring Boot LeetCode