java - Highcharts - 从 Servlet 到 JSP

Question

我在使用 Highcharts 和 servlet/jsp 时遇到一些问题。

我对 AJAX 和 JQUERY 不太熟悉。

我想在 jsp 页面 2 中显示实时线系列，并通过 java servlet 从数据库加载相关数据 (x,y)。

这是我的jsp中的代码:

<script type="text/javascript">
$(function () {

    var seriesOptions = [];
    $.getJSON('Grafico', function(data) {

        // Populate series
        for (i = 0; i < data.DeltaRealTime.length; i++){
            seriesOptions[i] = {
                name: data.DeltaRealTime[i].name,
                data: [data.DeltaRealTime[i].key, parseFloat(data.DeltaRealTime[i].value)]
            };
        }

        $('#container').highcharts({
            chart: {
                type: 'spline',
                animation: Highcharts.svg, // don't animate in old IE
                marginRight: 10,

                events: {
                    load: function() {

                        // set up the updating of the chart each second
                        setInterval(function() {

                            $.getJSON('Grafico', function(data) {
                                // Populate series
                                for (i = 0; i < data.DeltaRealTime.length; i++){
                                    var chart = $('#container').highcharts();
                                    chart.series[i].addPoint([data.DeltaRealTime[i].key, parseFloat(data.DeltaRealTime[i].value)]);
                                }
                            });
                        }, 1000);
                    }
                }
            },
            title: {
                text: "Valori Delta"
            },
            xAxis: {
                title: {
                    text: 'Campione'
                }
            },
            yAxis: {
                labels: {
                    format: '{value:.1f}'
                },
                title: {
                    text: 'Delta(f)'
                },
            },
            series: seriesOptions
        });
    });
});
</script>

这是“Grafico”servlet:

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

    response.setContentType("text/json");
    PrintWriter out = response.getWriter();

    try {

        HttpSession session = request.getSession();

        Seriale seriale = (Seriale)session.getAttribute("seriale");

        if(seriale == null)
            System.out.println("SERIALE=NULL");
        else {
            if(seriale.getSeriale().isOpen())
                System.out.println("SERIALE APERTA");

            System.out.println("ID SESSIONE DATI="+seriale.getSessioneDati().getId());
        }


        if(seriale != null && seriale.getSeriale().isOpen()) {

            System.out.println("INIZIO A LEGGERE I DATI DAL DB");

            Db db = new Db();
            db.apriConnessione();

            String sql = "SELECT * FROM MisuraRiposo ORDER BY id DESC LIMIT 1";
            PreparedStatement ps = db.getConnection().prepareStatement(sql);

            ResultSet rs = ps.executeQuery();

            Map<String, String> data1 = new HashMap<String,String>();
            Map<String, String> data2 = new HashMap<String,String>();

            if(rs.next()) {
                data1.put("name", "f1");
                data1.put("key", rs.getString("campione"));
                data1.put("value", rs.getString("f1"));
                data2.put("name", "f2");
                data2.put("key", rs.getString("campione"));
                data2.put("value", rs.getString("f2"));
            }

            rs.close();
            ps.close();
            db.chiudiConnessione();

            JSONObject json1 = new JSONObject(data1);
            JSONObject json2 = new JSONObject(data2);
            JSONArray array = new JSONArray();
            array.put(json1);
            array.put(json2);
            JSONObject finalObject = new JSONObject();
            finalObject.put("DeltaRealTime", array);

            out.write(finalObject.toString());
        }

    }
    catch(JSONException jse) {
        jse.printStackTrace();
    }
    catch(Exception e) {
        e.printStackTrace();
    }
    finally {
        out.flush();
        out.close();

        System.out.println("Fine servlet grafico");
    }

}

问题是我无法获得所需的行为。我只获得断开的点。

提前感谢您的帮助:)

Answer 1

我发现了问题。 Internet Explorer 上似乎存在 JQUERY 问题。

$.getJSON('Grafico', function(data) { ... }

在 IE11 中不起作用。

我改变了它

$.ajax({
                        type: $('#form1').attr('method'),
                        url: "Grafico",
                        cache:false,
                        dataType:'json',
                        success: function(data){
                            for (var i = 0; i < data.DeltaRealTime.length; i++){
                                chart1.series[i].addPoint([parseInt(data.DeltaRealTime[i].key),parseFloat(data.DeltaRealTime[i].value)]);
                            }
                        }
                    });

一切都运行良好。