javax.el.PropertyNotFoundException：在类型java.lang.String上找不到属性'tname' [英] javax.el.PropertyNotFoundException: Property 'tname' not found on type java.lang.String

问题描述

我之前使用过scriptlet，但现在我切换到了mvc。我无法在JSP页面上检索值并收到错误：

I was using scriptlets earlier, but now I switched to the mvc. I am not able to retrieve values on to the JSP page and getting errors:

javax.el.PropertyNotFoundException: Property 'tname' not found on type java.lang.String

Bean的代码：

public class regForm extends org.apache.struts.validator.ValidatorForm implements Iprafunctions {

    private String tname = null;
    private String tfee = null;

    public String getTfee() {
        return tfee;
    }

    public void setTfee(String tfee) {
        this.tfee = tfee;
    }

    public String getTname() {
        return tname;
    }

    public void setTname(String tname) {
        this.tname = tname;
    }
    public regForm() {
        super();
    }
}

行动控制人：

public ActionForward mvc(ActionMapping mapping, ActionForm form,
        HttpServletRequest request, HttpServletResponse response)
        throws Exception {
    regForm reg = (regForm) form;
    String sql = "Select tname,tfee from addtest order by tname";
    ResultSet rs = SQLC.getData(sql, null);
    Collection myBeans = new ArrayList();
    while (rs.next()) {
        String testname = rs.getString("tname");
        String testfee = rs.getString("tfee");
        reg.setTname(testname);
        reg.setTfee(testfee);
        myBeans.add(reg.getTname());
        myBeans.add(reg.getTfee());
    }
    request.setAttribute("myBeans", myBeans);
    return mapping.findForward(SUCCESS);
}

JSP页面访问

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<table>
    <tr><td>Name</td><td>Fee</td></tr>
    <c:forEach var="reg" items="${myBeans}">
        <tr>
            <td><c:out value="${reg.tname}"></c:out></td>
            <td><c:out value="${reg.tfee}"></c:out></td>
        </tr>
    </c:forEach>
</table>

推荐答案

我想你是直接添加名字和费用到arraylist，但你应该在arraylist中添加整个 regForm 对象。

I think you are adding the names and the fee directly to the arraylist, but you should be adding the whole regForm object in the arraylist.

而不是下面的代码

myBeans.add(reg.getTname());
myBeans.add(reg.getTfee());

你需要做的事情

myBeans.add(reg);

此外，不要使用从表单中获得的相同对象。尝试创建新对象并添加到arraylist并尝试使用泛型。

moreover dont use the same object that you got from the form. Try to create new objects and add in the arraylist and try to use generics.

编辑：

while (rs.next()) {
        String testname = rs.getString("tname");
        String testfee = rs.getString("tfee");
        regForm beanObject = new regForm();
        beanObject.setTname(testname);
        beanObject.setTfee(testfee);
        myBeans.add(beanObject);
    }

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