1、準(zhǔn)備Jar包：jfreechart-1.0.13.jar和jcommon-1.0.16.jar

2、配置web.xml

<!-- JFreeChart --> 
    <servlet> 
        <servlet-name>DisplayChart</servlet-name> 
        <servlet-class>org.jfree.chart.servlet.DisplayChart</servlet-class> 
    </servlet> 
    <servlet-mapping> 
        <servlet-name>DisplayChart</servlet-name> 
        <url-pattern>/DisplayChart</url-pattern> 
    </servlet-mapping> 

3、Action(Struts2)

/**  
     * 曲線圖  
     * */ 
    @SuppressWarnings("deprecation")  
    public String quxiantu() throws Exception {  
        String plateNum = request.getParameter("plateNum");  
        String startDateTimeStr = request.getParameter("startTime");  
        String stopDateTimeStr = request.getParameter("stopTime");  
        List<Object[]> dataSet = mileageStatService.getVehicleFuelByPlateNum(plateNum, startDateTimeStr, stopDateTimeStr);  
          
        //訪問(wèn)量統(tǒng)計(jì)時(shí)間線  
        TimeSeries timeSeries = new TimeSeries(plateNum+"油耗統(tǒng)計(jì)", Minute.class);  
        //時(shí)間曲線數(shù)據(jù)集合  
        TimeSeriesCollection lineDataset = new TimeSeriesCollection();         
        //構(gòu)造數(shù)據(jù)集合  
        for(Object[] obj : dataSet){  
            timeSeries.addOrUpdate(new Minute(dateformat.parse(obj[0].toString())), Long.valueOf(obj[1].toString()));  
        }  
        lineDataset.addSeries(timeSeries);  
        //**************************************************************************************  
        //解決中文亂碼  
        StandardChartTheme standardChartTheme = new StandardChartTheme("JFree");  //或者為L(zhǎng)egacy     
        standardChartTheme.setLargeFont(new Font("宋體", Font.BOLD, 12));     
        standardChartTheme.setRegularFont(new Font("宋體", Font.BOLD, 12));     
        standardChartTheme.setExtraLargeFont(new Font("宋體", Font.BOLD, 12));     
        standardChartTheme.setSmallFont(new Font("宋體", Font.BOLD, 12));     
        ChartFactory.setChartTheme(standardChartTheme);    
        //**************************************************************************************  
        JFreeChart chart = ChartFactory.createTimeSeriesChart("油耗統(tǒng)計(jì)時(shí)間線", "時(shí)間", "油耗", lineDataset, true, true, true);           
        //***********************************************************************************  
          
        XYPlot plot = chart.getXYPlot();  
        //設(shè)置網(wǎng)格背景顏色  
        plot.setBackgroundPaint(Color.white);  
        //設(shè)置網(wǎng)格豎線顏色  
        plot.setDomainGridlinePaint(Color.LIGHT_GRAY);  
        //設(shè)置網(wǎng)格橫線顏色  
        plot.setRangeGridlinePaint(Color.LIGHT_GRAY);  
        //設(shè)置曲線圖與xy軸的距離  
        plot.setAxisOffset(new RectangleInsets(0D, 0D, 0D, 10D));  
        //設(shè)置X軸（日期軸）  
        DateAxis dateaxis = (DateAxis) plot.getDomainAxis();  
        //時(shí)間軸間距是5分鐘,格式為小時(shí):分鐘  
        dateaxis.setTickUnit(new DateTickUnit(DateTickUnit.MINUTE, 30));  
        dateaxis.setDateFormatOverride(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"));  
        //X軸日期垂直顯示(沒找到傾斜多少度顯示)  
        dateaxis.setVerticalTickLabels(true);  
        //***********************************************************************************  
        //設(shè)置子標(biāo)題  
        TextTitle subtitle = new TextTitle(startDateTimeStr+" 到 "+stopDateTimeStr, new Font("宋體", Font.PLAIN, 12));  
        chart.addSubtitle(subtitle);  
        //設(shè)置主標(biāo)題  
        chart.setTitle(new TextTitle(plateNum+"油耗統(tǒng)計(jì)", new Font("黑體", Font.BOLD, 15)));  
        chart.setAntiAlias(true);  
          
        String filename = ServletUtilities.saveChartAsPNG(chart, 700, 500, null, request.getSession());  
        String graphURL = request.getContextPath() + "/DisplayChart?filename=" + filename;  
          
        request.setAttribute("graphURL", graphURL);  
        request.setAttribute("filename", filename);  
          
        return "quxiantu";  
    } 

4、JSP

<img src="${graphURL}" width="550" height="350" border="0" usemap="#${filename}" > 

附圖：

原文鏈接：http://zhangzi.iteye.com/blog/1130051

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