需求：

Controller層直接alert

實現(xiàn)：

protected String alert(HttpServletResponse response, String msg, String url) {
  response.setCharacterEncoding("UTF-8");
  response.setHeader("Content-type", "text/html;charset=UTF-8");
  PrintWriter out = null;
  try {
    out = response.getWriter();
    out.print("<script>alert('" + msg + "');window.location.href='"
        + url + "';</script>");
    out.flush();
  } catch (IOException e) {
    e.printStackTrace();
  } finally {
    IOUtils.closeQuietly(out);
  }
  return "common/suc";

}

protected void alertAndclose(HttpServletResponse response, String msg) {
  response.setCharacterEncoding("UTF-8");
  response.setHeader("Content-type", "text/html;charset=UTF-8");
  PrintWriter out = null;
  try {
    out = response.getWriter();
    out.print("<script>alert('" + msg + "');window.close();</script>");
    out.flush();
  } catch (IOException e) {
    e.printStackTrace();
  } finally {
    IOUtils.closeQuietly(out);
  }

}