对于maven工程，需要引入依赖：
在pom.xml中，添加如下内容
<dependency>
<groupId>jfree</groupId>
<artifactId>jfreechart</artifactId>
<version>1.0.13</version>
</dependency>
/**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 }
