Type mismatch: cannot convert from Object to String

在jsp页面中获取从action中传入request中的值，报如下错误：

An error occurred at line: 28 in the jsp file: /homepage.jsp
Type mismatch: cannot convert from Object to String
25:   
26:   
27:     This is my homepage page. 

28:     <%String ss = request.getAttribute("gender"); %>
29:     gender: <% =ss%>
30:   
31: 

action中相关代码如下：

Map request = (Map)ActionContext.getContext().get("request");
Reader rea = (Reader)list.get(0);
request.put("gender", rea.getGender());

jsp中相关代码如下：

  
    This is my homepage page. 

    <%String ss = request.getAttribute("gender"); %>
    gender: <%=ss%>
  

原因：
    request.getAttribute(“gender”);返回的是一个object对象，不能直接转换成String，需要强制转换，即采用：

<%String ss = (String)request.getAttribute("gender"); %>

替换掉jsp中的代码即可。

运行结果为：