springmvc中使用response的out.print问题

public ModelAndView handleRequest(HttpServletRequest request,  
        HttpServletResponse response) throws Exception {  
    Member member = (Member) RequestUtil.parseRequestToObject(request,Member.class);  
    if (member == null) {  
        jzLogic.insertMember(member);  
        return new ModelAndView("index");  
    } else {  
        return new ModelAndView("Error", "message", "账号已被注册!");  
    }  
}  

在上述代码中如果需要使用out.print打印如alert("");信息可按以下方式进行:

......  
    response.setContentType("text/html; charset=gbk");  
    PrintWriter out = response.getWriter();   
    out.println("");   
    return null;  
......  

return null,如果return new ModelAndView则直接转发

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