在java代码的servlet中输出alert乱码问题

 		***response.setContentType("text/html;charset=UTF-8");
        PrintWriter out ;
        String contextPath = request.getContextPath();***


ProductService productService=new
                ProductServiceImpl();
        int result=productService.insert(productInfo);

        out = response.getWriter();
        if (result == -1) {
            out.print("<script type=\"text/javascript\">");
            out.print("alert(\"添加没有成功\");");
            out.print("location.href=\"" + contextPath
                    + "/ListServlet\";");
            out.print("</script>");
        } else if (result == 0) {
            out.print("<script type=\"text/javascript\">");
            out.print("alert(\"未找到相关信息\");");
            out.print("location.href=\"" + contextPath
                    + "/ListServlet\";");
            out.print("</script>");
        } else {
            out.print("<script type=\"text/javascript\">");
            out.print("alert(\"已经成功添加信息，点击确认返回首页\");");
            out.print("location.href=\"" + contextPath
                    + "/ListServlet\";");
            out.print("</script>");
        }