对于maven工程，需要引入依赖： 在pom.xml中，添加如下内容

        
      
       jfree
         
      
       jfreechart
         
      
       1.0.13
       
     

　　/**生成普通折线图    * @param imgTitle  图片的title 　　* @param xLabel x轴标签 　　* @param yLabel y轴标签 　　/  1 public static void drawPNG(DefaultCategoryDataset ds, String savingPath, String imgTitle, String xLabel, String yLabel, int width, int height) { 2         JFreeChart lineChart = ChartFactory.createLineChart(imgTitle, xLabel, yLabel, ds, PlotOrientation.VERTICAL, true, true, false); 3         File chart = new File(savingPath); 4         try { 5             ChartUtilities.saveChartAsPNG(chart, lineChart, width, height); 6         } catch (Exception e) { 7             System.out.println(ErrorCodeEnum.CREATE_IMAGE_FAILED.getMessage()); 8             e.printStackTrace(); 9         }10 11     } 　　

　　

1 //创建数据集对象 2    public static   DefaultCategoryDataset getDataSet(){    3         DefaultCategoryDataset line_chart_dataset = new DefaultCategoryDataset(); 4         line_chart_dataset.addValue(15, "schools", "1970"); 5         line_chart_dataset.addValue(30, "schools", "1980"); 6         line_chart_dataset.addValue(60, "schools", "1990"); 7         line_chart_dataset.addValue(120, "schools", "2000"); 8         line_chart_dataset.addValue(240, "schools", "2010"); 9         line_chart_dataset.addValue(300, "schools", "2014"); 10         11         return line_chart_dataset;12 }