Question

我不确定如何在Spring MVC表单标记中定义value属性。我正在查询数据库，我想将数据返回给jsp。我以列表的形式将对象返回到视图。我想知道如何为选项列表和输入框编写属性值。以下是我的代码：

JSP

<form:form id="citizenRegistration" name ="citizenRegistration" method="POST" commandName="citizens" action="citizen_registration.htm">

<li>
<label>Select Gender</label><form:select path="genderId" id="genderId" title="Select Your Gender"><form:options items = "${gender.genderList}" selected=???? itemValue="genderId" itemLabel="genderDesc" />
</form:select><form:errors path="genderId" class="errors"/>
</li>               
                                            <li><form:label for="weight" path="weight">Enter Weight <i>(lbs)</i></form:label>
<form:input path="weight" id="weight" title="Enter Weight" value= ???/><form:errors path="weight" class="errors"/>
</li>

JavaDao

该函数返回： ........................

   List<Citizens> listOfCitizens = getJdbcTemplate().query(sql, new CitizensMapper());      
    return listOfCitizens;

控制器

if (user_request.equals("Query")){
 logger.debug("about to preform query");
 citizenManager.getListOfCitizens(citizen);

 if(citizenManager.getListOfCitizens(citizen).isEmpty()){
    model.addAttribute("icon","ui-icon ui-icon-circle-close");
    model.addAttribute("results","Notice: Query Caused No Records To Be Retrived!");    
  }

//how do i return the List<Citizens> listOfCitizens
//or what should be done to send the user the data from the database
return new ModelAndView("citizen_registration");                    
}

Answer 1

该值来自您的表单citizens属性定义的模型对象（在您的案例中为commandName）。 Spring使用它和path属性来查找表单对象的值。

因此，例如，没有必要专门为value属性提供值。

修改

这是一个简化的例子：

@RequestMapping(value = "/editCitizen", method = RequestMethod.GET) public String editCitizen(@ModelAttribute("citizen") Citizen citizen, Model model) { // set attributes of citizen citizen.genderId = "M"; citizen.weight = 180; // etc. // set other model attributes like lists for <form:select>s model.addAttribute("genderList", <list of genders>); return "path.to.my.jsp"; } <form:form id="citizenRegistration" name ="citizenRegistration" method="POST" commandName="citizen" action="citizen_registration.htm"> <form:select path="genderId" items="${genderList}" itemLabel="genderDesc" itemValue="genderId"></form:select> <form:input path="weight" id="weight" title="Enter Weight"/> </form:form>

Spring MVC jsp标签占位符用于标记值

1 个答案: