JFreeChart
作者:互联网
星朝博客:jFreeChart利用CategoryDatase,ChartFactory.createBarChart生成的柱状图
/**
* 创建JFreeChart Bar Chart(柱状图)
*/
public static void main(String[] args) {
//步骤1:创建CategoryDataset对象(准备数据)
CategoryDataset dataset = createDataset();
//步骤2:根据Dataset 生成JFreeChart对象,以及做相应的设置
JFreeChart freeChart = createChart(dataset);
//步骤3:将JFreeChart对象输出到文件,Servlet输出流等
saveAsFile(freeChart, "D:\\资料\\bar.png", 500, 400);
}
// 创建CategoryDataset对象
public static CategoryDataset createDataset() {
String []rowKeys = {"One", "Two", "Three"};
String []colKeys = {"1987", "1997", "2007"};
double [][] data = {
{100, 20, 50},
{20, 10.5, 40},
{40, 30.0008, 38.24},
};
//也可以使用以下代码
DefaultCategoryDataset categoryDataset = new DefaultCategoryDataset();
categoryDataset.addValue(688, "小a", "sum");
categoryDataset.addValue(600, "小b", "sum");
categoryDataset.addValue(95, "小a", "avg");
categoryDataset.addValue(80, "小b", "avg");
// return DatasetUtilities.createCategoryDataset(rowKeys, colKeys, data);
return categoryDataset;
}
//根据CategoryDataset生成JFreeChart对象
public static JFreeChart createChart(CategoryDataset categoryDataset) {
JFreeChart jfreechart = ChartFactory.createBarChart("测试表", //标题
"ss", //categoryAxisLabel (category轴,横轴,X轴的标签)
"aa", //valueAxisLabel(value轴,纵轴,Y轴的标签)
categoryDataset, // dataset
PlotOrientation.VERTICAL,
true, // legend
false, // tooltips
false); // URLs
Font font = new Font("新宋体", Font.BOLD, 15);
//设置整个图片的标题字体
jfreechart.getTitle().setFont(font);
jfreechart.getLegend().setItemFont(font);
//以下的设置可以由用户定制,也可以省略
CategoryPlot plot = (CategoryPlot) jfreechart.getPlot();
//背景色 透明度
plot.setBackgroundAlpha(1f);
//前景色 透明度
plot.setForegroundAlpha(1f);
//其它设置可以参考 CategoryPlot
return jfreechart;
}
//保存为文件
public static void saveAsFile(JFreeChart chart, String outputPath, int weight, int height) {
FileOutputStream out = null;
try {
File outFile = new File(outputPath);
if (!outFile.getParentFile().exists()) {
outFile.getParentFile().mkdirs();
}
out = new FileOutputStream(outputPath);
//保存为PNG文件
ChartUtilities.writeChartAsPNG(out, chart, weight, height);
//保存为JPEG文件
//ChartUtilities.writeChartAsJPEG(out, chart, weight, height);
out.flush();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (out != null) {
try {
out.close();
} catch (IOException e) {
//do nothing
}
}
}
}
标签:JFreeChart,CategoryDataset,static,jfreechart,categoryDataset,out 来源: https://www.cnblogs.com/loveDonkey/p/16080420.html