servlet 输出 javascript 乱码

response.setContentType("text/html;charset=utf-8");

response.setCharacterEncoding("utf-8");
都是以这种方法就解决的。
成功添加 条记录=》\成\功\添\加 \条\记\录
  response.setContentType("text/html");

  PrintWriter out = response.getWriter();
  out.println("alert(\"\\成\\功\\添\\加 "+items.length+" \\条\\记\\录!\")");

  out.println("self.location.href=\"enterprise.do\"");

  out.println("</script>");

  

  out.flush();

  out.close();
或
response.setContentType("text/html;charset=utf8");

response.setCharacterEncoding("utf-8");

out.println("<script language = javascript >alert('验证码错误！');");

out.println("location.href='/MyF01/Admin/Login_Admin.jsp'</script>");