<c:url var="addAction" value="/students/add"/>

<form:form action="${addAction}" commandName="student">
<table>
    <c:if test="${!empty student.name}">
        <tr>
            <td>
                <form:label path="id">
                    <spring:message text="ID"/>
                </form:label>
            </td>
            <td>
                <form:input path="id" readonly="true" size="8" disabled="true"/>
                <form:hidden path="id"/>
            </td>
        </tr>
    </c:if>
    <tr>
        <td>
            <form:label path="name">
                <spring:message text="Имя"/>
            </form:label>
        </td>
        <td>
            <form:input path="name"/>
        </td>
    </tr>

    ...

    <tr>
        <td colspan="2">
            <c:if test="${!empty student.name}">
                <input type="submit"
                       value="<spring:message text="Изменить студента"/>"/>
            </c:if>
            <c:if test="${empty student.name}">
                <input type="submit"
                       value="<spring:message text="Добавить студента"/>"/>
            </c:if>
        </td>
    </tr>
</table>

@RequestMapping(value = "/students/add", method = RequestMethod.POST)
public String addStudent(@ModelAttribute("student") Student student){

    this.studentService.addStudent(student);

    return "redirect:/students";
}