无法访问Thymeleaf中的会话属性
[英]Can't access session attributes in Thymeleaf
问题描述
I'm using Thymeleaf with Springboot2.1.2 and I have problem accessing session attributes in the templates. 
我在Springboot2.1.2中使用Thymeleaf，但在访问模板中的会话属性时遇到问题。
Here's the code: 这是代码：
This is one of the controllers: 这是控制器之一：
@GetMapping("/profile")
public String getProfile(HttpServletRequest request) {
HttpSession session = request.getSession(false);
String email = (String) session.getAttribute("userId");
User user = userService.getProfile(email);
session.setAttribute("user", user);
return "user/profile";
}
And the corresponding view(html): 和相应的视图（html）：
<body th:object="${session.user}">
//some code using the user object here...
</body>
When I run the application, I got the exception: 运行应用程序时，出现异常：
java.lang.IllegalStateException: Neither BindingResult nor plain target object for bean name 'session' available as request attribute
I've also tried for #session and something else, they didn't work. 我也尝试了#session和其他方法，但是它们没有用。 However, in another controller, I can access the object by using Model: 但是，在另一个控制器中，我可以使用Model来访问对象：
@GetMapping("/register/user")
public String registerUser(Model model) {
model.addAttribute("user", new User());
return "user/register";
}
And the view is like: 而且视图就像：
<form th:object="${user}" method="post" action="#" th:action="@{/register/user}">
//some code using the user object...
</form>
It's driving me crazy since all the tutorials I can find tell me I can access session attributes by ${session.something} , in reality, it doesn't work. 这让我发疯，因为我可以找到的所有教程都告诉我可以通过${session.something}访问会话属性，实际上这是行不通的。
Could you help me? 你可以帮帮我吗？
2 个解决方案
解决方案1
0 2019-02-11 09:55:35
You should be using Spring-Security with thymeleaf extensions to accomplish what you want. 您应该将Spring-Security与thymeleaf扩展结合使用来完成所需的工作。 Here is an example of what you want to do. 这是您想做的一个例子 。 If you follow the example you can access user information as follows: 如果遵循该示例，则可以按以下方式访问用户信息：
<div sec:authentication="name"><!-- Display UserName Here --></div>
Please note that for spring-boot 2.1.X you should use the following dependency: 请注意，对于spring-boot 2.1.X，您应该使用以下依赖项：
<dependency>
<groupId>org.thymeleaf.extras</groupId>
<artifactId>thymeleaf-extras-springsecurity4</artifactId>
</dependency>
解决方案2
0 已采纳 2019-02-11 10:38:56
You are saving the information in the session, this is not visible by thymeleaf. 您正在会话中保存信息，百里香叶看不到该信息。 you need to create a model for your thymeleaf template and add the attribute (or the session) to the model and then return that. 您需要为您的百里香模板创建一个模型，并将属性（或会话）添加到该模型中，然后将其返回。
@GetMapping("/profile")
public ModelAndView getProfile(HttpServletRequest request) {
User user = userService.getProfile(email);
ModelAndView model = new ModelAndView(NAME_OF_THYMELEAF_PROFILE_FILE);
model.addObject("user",user);
return model;
}
Beware that for the thymeleaf to see the template it needs to be in a default path (resources/templates) or you need to define where your templates are stored. 请注意，要使百里香叶看到模板，它必须位于默认路径（资源/模板）中，或者您需要定义模板的存储位置。
If you want to use session again the solution is similar. 如果您想再次使用会话，则解决方案类似。
@GetMapping("/profile")
public ModelAndView getProfile(HttpServletRequest request) {
HttpSession session = request.getSession(false);
User user = userService.getProfile(email);
session.setAttribute("user", user);
ModelAndView model = new
ModelAndView(NAME_OF_THYMELEAF_PROFILE_FILE);
model.addObject("session",session);
return model;
}
UPDATE use model and return String: UPDATE使用模型并返回String：
@GetMapping("/profile")
public String getProfile(HttpServletRequest request, Model model) {
HttpSession session = request.getSession(false);
String email = (String) session.getAttribute("userId");
User user = userService.getProfile(email);
session.setAttribute("user", user);
model.addAttribute("session", session);
return "user/profile";
}
I used ModelAndView , you can do the same with Model , just instead of addObject() you must use addAttribute() . 我使用了ModelAndView ，您可以对Model进行同样的操作，只是必须使用addAttribute()代替addObject() addAttribute() 。
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