Question

下面是我的JSP和控制器类，而我在tomcat中运行我的应用程序时遇到此异常。

<form:form action="userDetails" method="post" commandName="user">
  <form:label path="firstName">First Name</form:label>
  <form:input path="firstName"/><br/>
  <form:label path="lastName">Last Name</form:label>
  <form:input path="lastName"/><br/>
  <form:label path="nickName">Nick Name</form:label>
  <form:input path="nickName"/><br/>
  <form:label path="emailAddress">Email Address</form:label>
  <form:input path="emailAddress"/><br/>
  <input type="submit" value="submit"/>
</form:form>

控制器：

@RequestMapping(value="userDetails",method=RequestMethod.GET)
    public String getEmployeeDetailsPost(@ModelAttribute("user")User user,ModelMap map){
        map.put("firstName", user.getFirstName());
        map.put("lastName", user.getLastName());
        map.put("nicName", user.getNickName());
        map.put("email", user.getEmailAddress());
        return "success";
    }

Answer 1

只需将此方法添加到您的控制器：

@ModelAttribute("user")
public User getUserForm() {
    return new User();
}

您必须使其可用于请求。通过这种方法，spring将在模型中初始化User对象，并且能够在表单提交请求上分配值。

Answer 2

尝试这样的事情：

控制器：

    @RequestMapping(value = "/userDetails", method = RequestMethod.GET)
    public String userFormRender(Model model)
    {
        model.addAttribute("user", new User());
        return "jspPageName";
    }

    @RequestMapping(value = "/userDetails", method = RequestMethod.POST)
    public String userFormAction(@ModelAttribute("user") User user, Model model)
    {
        System.out.println("User firstName: " + user.getFirstName());

        return "redirect:/";
    }

JSP：

<form:form method="post" commandName="user">
  <form:label path="firstName">First Name</form:label>
  <form:input path="firstName"/><br/>
  <form:label path="lastName">Last Name</form:label>
  <form:input path="lastName"/><br/>
  <form:label path="nickName">Nick Name</form:label>
  <form:input path="nickName"/><br/>
  <form:label path="emailAddress">Email Address</form:label>
  <form:input path="emailAddress"/><br/>
  <input type="submit" value="submit"/>
</form:form>

BindingResult和bean名称'user'的普通目标对象都不可用作请求属性

2 个答案: