如何获取地图 <String, String[]> 控制器中的@RequestParam获取数据？

Question

I have a page with many questions, and they can have multiple answers.

It's look like this, for every question:

<div th:each="answer: ${question.answers}">
    <input th:type="${question.type == T(test_system.entity.QuestionType).SINGLE ? 'radio' : 'checkbox'}"
           type="radio" th:name="${question.id}" th:value="${answer.id}"/>
    [[${answer.text}]]
</div>

I want to get a Map<String, String[]> in controller, which processes this request. (key is id of question, values is answers for this question)

I have this code in controller:

@RequestMapping(value = "/work/{id}/finish", method = RequestMethod.POST)
public String sendTestAnswers(@PathVariable final long id, @RequestParam final Map<String, String[]> data, final HttpServletRequest request, final Model model) {
    ...
}

But in data I see Map<String, String> , with only one anwer for every question.

Also in request.getParameterMap() I see Map<String, String[]> with all values that I need.

How can I bind arguments to get prepared object with all data that I need? I don't want to work with HttpServletRequest directly.

Answer 1

I think you should give MultiValueMap a try: http://docs.spring.io/spring-framework/docs/current/javadoc-api/org/springframework/util/MultiValueMap.html

It is better suited for these kind of data.