java PrintWriter 页面 js 乱码

PrintWriter printWriter;

    try {
     response.setContentType("text/html; charset=GBK");//解决乱码
     printWriter = response.getWriter();
     printWriter.append("<script language=\"javascript\">");
     printWriter.append("alert('原密码不正确！');");
     printWriter
       .append("self.location.href='jsp/operator/myinfo.jsp'");
     printWriter.append("</script>");
     printWriter.flush();
    } catch (IOException e) {

     e.printStackTrace();
    }