PrintWriter out = response.getWriter() 输出中文乱码问题

  HttpServletResponse response = ServletActionContext.getResponse();      
  response.setCharacterEncoding("utf-8");
  response.setContentType("text/xml;charset=utf-8");   
  response.setHeader("Cache-Control", "no-cache");  

  //确保在取得PrintWriter对象之前先设置response的编码；顺序搞错将无法解决中文乱码问题！
  PrintWriter out = response.getWriter();