action直接输出流

action 里边输出JS代码，已经测试成功，解决乱码问题：
HttpServletResponse response = (HttpServletResponse) ServletActionContext.getResponse(); 
response.setCharacterEncoding("gb2312");
PrintWriter out = response.getWriter();
out.println("<script   type=\"text/javascript\"   language=\"javascript\">");  
out.println("alert(\"操作成功！\")");  
out.println("</script>");  
out.close();

return null