从带有EL的html表单获取servlet中的请求参数 [英] Getting a request parameter in a servlet from html form set with EL

问题描述

我有一个带有以下EL/html标记的JSP:

I have a JSP with the following EL/html tags:

    <c:forEach var="key" items="${resource.stringPropertyNames()}">
    <tr>
        <td>${key}</td>
        <td><input type = "text" name = "${key}" value = "${resource.get(key)}"></td>                           
    </tr>
    </c:forEach>

渲染我的jsp时，第一个<td>标记显示$ {key}的评估值.但是，在<input>标记中，未正确评估$ {key}.当我尝试从servlet(request.getParameter(StringKey))检索输入作为请求参数时，我得到的文字$key不带花括号.当我执行request.getParameter("$key")时，我得到了${resource.get(key)}在EL中求值的字符串的多个值.

When my jsp is rendered, the first <td> tag shows the evaluated value of ${key}. In the <input> tag however, the ${key} is not evaluated correctly. When I try to retrieve the input as request parameters from my servlet (request.getParameter(StringKey)), I get the literal $key without the braces. When I do request.getParameter("$key"), I get multiple values for the Strings that ${resource.get(key)} evaluate to in the EL.

这是怎么回事?

编辑

控制器方法(使用spring)代码:

Controller method (using spring) code:

    @RequestMapping(value = URI_PATH + "{fileName}", method = RequestMethod.GET)
    public String getProperties(@PathVariable String fileName, ModelMap modelMap) {
        Properties resource = ..//get properties file
        modelMap.addAttribute("resource", resource);
        return "configuration" // maps to my jsp;
    } 

推荐答案

如果资源是地图，则使用request.setAttribute("resource", resource)

If resource is a Map, which is set using request.setAttribute("resource", resource)

<c:forEach var="entry" items="${resource}">
<tr>
    <td>${entry.key}</td>
    <td><input type = "text" name = "${entry.key}" value = "${entry.value}"></td>                           
</tr>
</c:forEach>

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