java - Spring MVC表单提交: view to controller pass not put form attribute

Question

我有一个 portlet，它能够显示表单，然后允许将用户设置的内容传递到对象中的 Controller 。而且效果很好。我只是希望应用程序能够从 jsp 设置附加属性，但不能从表单的输入中设置附加属性。

模型

public class Person {
    String firstName;
    String middleName;
    String attributeSetStatically;

    // Setters and getters

    public void setAttributeSetStatically(String attributeFromJsp)
    {
        System.out.println("Call setAttributeSetStatically  "+attributeFromJsp);
        this.attributeSetStatically=attributeFromJsp;
    }
}

Controller

@Controller(value = "MyFirstSpringMVCPortlet")
@RequestMapping("VIEW")
public class MyFirstSpringMVCPortlet {

    @RenderMapping
    public ModelAndView handleRenderRequest() {
        ModelAndView modelAndView = new ModelAndView("welcome");
        modelAndView.addObject("person", new Person());
        modelAndView.addObject("msg", "Hello Spring MVC");
        return modelAndView; 
    }


    @ActionMapping(value = "handleSubmitPerson")
    public void submitPerson(@ModelAttribute("person") Person person,ActionRequest actionRequest, ActionResponse actionResponse,Model model) {
            System.out.println("FirstName= "+person.getFirstName());
            System.out.println("MiddleName= "+person.getMiddleName());
            System.out.println("attributeSetStatically= "+person.getAttributeSetStatically());
    }

}

查看(welcome.jsp)

<%@taglib uri="http://www.springframework.org/tags/form" prefix="form"%>
<%@ taglib uri="http://java.sun.com/portlet_2_0" prefix="portlet" %>
<h1>${msg}</h1>
<portlet:defineObjects />
<portlet:actionURL var="submitFormURL" name="handleSubmitPerson"/>
<form:form name="person" method="post" modelAttribute="person" action="<%=submitFormURL.toString() %>">
${person.setAttributeSetStatically('attributeSetStatically of person')}
<br/>
    <table style="margin-left:80px">
        <tbody>
            <tr>
                <td><form:label path="firstName">First Name</form:label></td>
                <td><form:input path="firstName"></form:input></td>
            </tr>
            <tr>
                <td><form:label path="middleName">Middle Name</form:label></td>
                <td><form:input path="middleName"></form:input></td>
            </tr>
            <tr>
                <td colspan="2"><input type="submit" value="Submit Form">
                </td>
            </tr>
        </tbody>
    </table>
</form:form>

我在控制台中得到的输出是:

FirstName= Kallel
MiddleName= Omar
attributeSetStatically= null
Call setAttributeSetStatically  attributeSetStatically of person

所以这个 ${person.setAttributeSetStatically('attributeSetStatically of person')} 在提交后被调用。为什么？有没有办法做我想做的事？

Answer 1

attributeSetStatically 可以在表单内的隐藏输入中设置:

<form:input type="hidden" name="attributeSetStatically" value="attributeSetStatically of person">