Question

这是我的控制器，

@Controller
public class CategoryController {
    @GetMapping(value="/categories")
    public String searchCategory(Map<String, Object> model, HttpSession session) {
        Category filter = (Category) session.getAttribute("filter");
        if(filter == null) {
            filter = new Category();
            session.setAttribute("filter", filter);
        }

        ...

        return "category-list";
    }   
}

我将对象存储到会话中，并使用下面的代码

在UI上显示它

<!DOCTYPE html>
<html lang="zh" xmlns:th="http://www.thymeleaf.org">
<body>
            ...
            <input type="text" class="form-control" id="name" th:field="${session.filter.name}" placeholder="name"/>
            ...
</body>

但我最后得到以下错误消息，在我看来，Thymeleaf将'session'视为请求中的正常对象，预定义的Webcontext对象的内容

2016-10-27 10:34:53.655 ERROR 5844 --- [nio-8080-exec-7] o.a.c.c.C.[.[.[.[dispatcherServlet]      : Servlet.service() fo
r servlet [dispatcherServlet] in context with path [/smartact] threw exception [Request processing failed; nested except
ion is org.thymeleaf.exceptions.TemplateInputException: An error happened during template parsing (template: "class path
 resource [templates/datamaster/category-list.html]")] with root cause

java.lang.IllegalStateException: **Neither BindingResult nor plain target object for bean name 'session' available as requ
est attribute**
        at org.springframework.web.servlet.support.BindStatus.<init>(BindStatus.java:144) ~[spring-webmvc-5.0.0.BUILD-SN
APSHOT.jar:5.0.0.BUILD-SNAPSHOT]
        at org.thymeleaf.spring4.util.FieldUtils.getBindStatusFromParsedExpression(FieldUtils.java:307) ~[thymeleaf-spri
ng4-3.0.0.RELEASE.jar:3.0.0.RELEASE]
        at org.thymeleaf.spring4.util.FieldUtils.getBindStatus(FieldUtils.java:258) ~[thymeleaf-spring4-3.0.0.RELEASE.ja
r:3.0.0.RELEASE]
        at org.thymeleaf.spring4.util.FieldUtils.getBindStatus(FieldUtils.java:227) ~[thymeleaf-spring4-3.0.0.RELEASE.ja
r:3.0.0.RELEASE]
        at org.thymeleaf.spring4.processor.AbstractSpringFieldTagProcessor.doProcess(AbstractSpringFieldTagProcessor.jav
a:173) ~[thymeleaf-spring4-3.0.0.RELEASE.jar:3.0.0.RELEASE]
        at org.thymeleaf.processor.element.AbstractAttributeTagProcessor.doProcess(AbstractAttributeTagProcessor.java:74
) ~[thymeleaf-3.0.0.RELEASE.jar:3.0.0.RELEASE]

感谢所有评论，提前感谢！

Answer 1

正如Prasanna Kumar所说，使用th:text="${filter.name}"（注意filter是属性的名称）。但是，还有一件更重要的事情：不要填写你的会话！在最坏的情况下，将其设置为Spring的会话属性。通常，您将使用请求属性：

@Controller
public class CategoryController {
    @GetMapping(value="/categories")
    public String searchCategory(@ModelAttribute("filter") Category filter, Model model) {
        filter = new Category();
        model.addAttribute("filter", filter);

        ...

        return "category-list";
    }   
}

Thymeleaf + Spring Boot：webcontext对象'session'无法正常工作

1 个答案: