servlet提交后弹出提示框并页面跳转

    PrintWriter out = response.getWriter();
    out.print("<script>alert('数据添加成功');location.href='/JFreeChartTest/upload_file.jsp'</script>");

如果前台弹出的提示框中显示的是????，需添加response.setContentType( "text/html;charset=GBK ");

即：     response.setContentType( "text/html;charset=GBK ");
            PrintWriter out = response.getWriter();
            out.print("<script>alert('数据添加成功');location.href='/JFreeChartTest/upload_file.jsp'</script>");