java JSTL如果条件在JSP页面中不起作用

1 月 Questions & Answers 1411

我基本上是试图向JSP页面发送一个arraylist，页面中的if条件决定在下拉列表中设置为“selected”的值

Servlet:

public class FeatureServlet extends HttpServlet {

    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        ArrayList<FeaturePermission> permList = new ArrayList<FeaturePermission>();

        FeaturePermission perm = new FeaturePermission();
        perm.setStatus("2");
        permList.add(perm);

        request.setAttribute("perms", permList); 
        RequestDispatcher rd = getServletContext().getRequestDispatcher("/CheckData.jsp");  
        rd.forward(request, response);

    }
}

检查数据。jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ page import="java.util.*" %>
<!DOCTYPE html>
<html lang="en">
    <head>
        <title>Test Page</title>
    </head>
    <body>
         <select id="check_status" name="check_status">
                <optgroup label="Choose Status">
                    <option value="1" <c:if test="${perms[0].status == 1}"> <c:out value="selected=selected"></c:out></c:if>>1</option>
                    <option value="2" <c:if test="${perms[0].status == 2}"> <c:out value="selected=selected"></c:out></c:if>>2</option>
                </optgroup>
        </select>
    </body>
</html>

功能权限类：

String ID = "";
String Status = "";

//Getter Setter & Constructors

我基本上需要检查参数“Status”中的值是否等于1，然后为下拉列表中的所有选项设置所选选项为1，依此类推

但是，当我运行它时，没有选择正确的值。我的代码正确吗

<option value="1" <c:if test="${perms[0].status == '1'}"> <c:out value="selected=selected"></c:out></c:if>>1</option> <option value="2" <c:if test="${perms[0].status == '2'}"> <c:out value="selected=selected"></c:out></c:if>>2</option>

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java JSTL如果条件在JSP页面中不起作用

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