JSP中输出CSV文件

<%@page import="com.opensymphony.xwork2.util.ValueStack"%>
<%
    ValueStack vs = (ValueStack)request.getAttribute("struts.valueStack");  
    String aa = (String)vs.findValue("downloadContent");
    response.setContentType("application/csv");
    response.setHeader("Content-Disposition", "inline; filename=result.csv");
    out.print(aa);
%>