因此，我目前正在参加有关Spring MVC的udemy课程。在当前部分中，正在构建一个简单的表单来提交名字和姓氏。
So i'm currently taking a course on udemy about Spring MVC. In the current section there's a simple form being build to submit firstname and lastname.
Hey user, may i know your name? <form:form action="hello" modelAttribute="info"> First Name: <form:input path="firstName" /> Last Name: <form:input path="lastName" /> <input type="submit" value="Submit" /> </form:form>输入信息通过信息类提交给HelloController
The input gets submitted via an Information Class to the HelloController
@Controller public class HelloController { @RequestMapping("/hello") public ModelAndView helloWorld(@RequestAttribute("info") Information userInfo) { ModelAndView model = new ModelAndView("hello"); model.addObject("firstName", userInfo.getFirstName()); model.addObject("lastName", userInfo.getLastName()); return model; } @RequestMapping("/") public ModelAndView homepage() { ModelAndView model = new ModelAndView("index", "info", new Information()); return model; }信息类别：
public class Information { private String firstName; private String lastName; public String getFirstName() { return firstName; } public void setFirstName(String firstName) { this.firstName = firstName; } public String getLastName() { return lastName; } public void setLastName(String lastName) { this.lastName = lastName; } }接下来应将信息类转发到视图文件hello.jsp
Next the informatiion Class should be forwarded to the view file hello.jsp
<body> <h2> Hello ${firstName} ${lastName} </h2><br/> </body>我以为这实际上很简单，但是在提交表单后，我得到了例外缺少请求属性信息类型的信息。我与udemy讲师的代码进行了双重检查，但没有发现任何错误。有人可以帮忙吗？
I thought this is actually rather simple, but after submitting the form i get the exception "Missing request attribute 'info' of type Information". I double-checked my code against the code from the udemy instructor, but couldn't find any errors. Can someone help?
在旁注中，我不知道它是否与该错误有关，但是在添加了 @Controller 到该类，eclipse中的自动完成功能将停止为该类工作。删除注释后，自动完成功能将再次开始起作用。
On a sidenote, i don't know if it has anything todo with this error, but after adding @Controllerto the Class, auto-completion in eclipse stops working for this Class. After removing the annotation auto-completion starts towork again.
推荐答案您使用了错误的注释。 @RequestAttribute 用于检索使用 setAttribute 。但是，您希望将请求参数绑定到对象，因此应使用 @ModelAttribute 批注。
You are using the wrong annotation. @RequestAttribute is for retrieving attributes set on the HttpServletRequest using setAttribute. You however want to bind request parameters to an object, for that you should use the @ModelAttribute annotation instead.
@RequestMapping("/hello") public ModelAndView helloWorld(@ModelAttribute("info") Information userInfo) { ... }更改注释将使其起作用。
Changing the annotation will make it work.
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Spring MVC缺少请求属性
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