准备用Java写通信的仿真平台作为毕业设计，相比matlab绘图，Java绘图需要自己去写很多工具类，博主在这采用了JFreeChart的开源解决方案，摸索着自己写了一个XY折线图工具类，话不多说贴源码，源码中写了很多注释，配了一套自己用的绘图样式，需要的童鞋可以借鉴借鉴，希望对你有帮助。源代码已上传我的github上。
首先用Maven引入Jar包
<!-- Java 绘图 -->
<dependency>
<groupId>jfree</groupId>
<artifactId>jfreechart</artifactId>
<version>1.0.13</version>
</dependency>
DrawingToolsTest工具类设计
先看效果
下方是我的测试方法，准备了x和y的数据放入Map中，然后传入已经写好的接口中，就一行代码。底层的过程都封装好了，调的话很方便
public class DrawingToolsTest {
@Test
public void testTools() {
int sum = 20;//随机生成20对数
Map<Double, Double> map1 = new HashMap<>();
double[] restX = RandomTools.getRadomDouble(1, 20, 1, sum);
double[] restY = RandomTools.getRadomDouble(1, 20, 1, sum);
for (int i = 0; i < sum; i++) {
map1.put(restX[i], restY[i]);
}
Map<Double, Double> map2 = new HashMap<>();
for (int i = 0; i < sum; i++) {
map2.put(restY[i], restX[i]);
}
Map<Double, Double>[] dataSet = new Map[]{map1, map2};
String[] types = new String[]{"A", "B"};
//调用绘图工具
DrawingTools.drawLineChart("axin", "测试", "这是X轴",
"这是y轴", dataSet, types);
Scanner in = new Scanner(System.in);
in.hasNext();
}
}
/**
* @author Axin
*/
public class RandomTools {
/**
* @param start
* @param end
* @param retain 保留几位小数
* @param sum 生成多少个数
* @return
*/
public static double[] getRadomDouble(int start, int end, int retain, int sum) {
double[] res = new double[sum];
for (int i = 0; i < sum; i++) {
BigDecimal db = new BigDecimal(Math.random() * (end - start) + start);
//四舍五入
res[i] = db.setScale(retain, BigDecimal.ROUND_HALF_UP).doubleValue();
}
return res;
}
}
运行后：
工具类源码
/**
* 后端绘图类
*
* @author Axin
* @date 2018-10-16
*/
@ConfigurationProperties(prefix = "draw")
public class DrawingTools extends ApplicationFrame {
private String titleFont;
private int titleFontSize;
private String xyFont;
private int xyFontSize;
DrawingTools() {
this("Axin");
}
public DrawingTools(String appTitle) {
super(appTitle);
this.titleFont = "微软雅黑";
this.titleFontSize = 20;
this.xyFont = "微软雅黑";
this.xyFontSize = 15;
}
/**
* @param appTitle 标题
* @param chartTitle 图标题
* @param xName x轴命名
* @param yName y轴命名
* @param dataSet 数据集
* @param types 线条种类
*/
public static void drawLineChart(String appTitle, String chartTitle,
String xName,
String yName,
Map<Double, Double>[] dataSet,
String[] types) {
DrawingTools tools = new DrawingTools(appTitle);
IntervalXYDataset dataset = tools.getLineDataset(dataSet, types);
JFreeChart chart = tools.getLineChart(chartTitle, xName, yName, dataset);
//绘图模式化
tools.setChartCSS(chart);
ChartPanel chartPanel = new ChartPanel(chart);
chartPanel.setPreferredSize(new java.awt.Dimension(900, 600));
tools.setContentPane(chartPanel);
tools.pack();
RefineryUtilities.centerFrameOnScreen(tools);
tools.setVisible(true);
}
private JFreeChart getLineChart(String title, String xName, String yName, XYDataset dataset) {
/**
* 图标标题，x轴名称，y轴名称，数据集合，图标显示方向，是否使用图示，是否生成工具栏，是否生成URL链接
*/
JFreeChart chart = ChartFactory.createXYLineChart(
title,
xName,
yName,
dataset,
PlotOrientation.VERTICAL,
true,
true,
false
);
return chart;
}
/**
* 自定义设置图表字体样式
*
* @param chart
*/
private void setChartCSS(JFreeChart chart) {
//初始化
chart.setBackgroundPaint(ChartColor.WHITE);
XYPlot plot = chart.getXYPlot();
//标题
TextTitle textTitle = chart.getTitle();
textTitle.setFont(new Font(titleFont, Font.BOLD, titleFontSize));
LegendTitle legendTitle = chart.getLegend();
legendTitle.setItemFont(new Font(titleFont, Font.PLAIN, titleFontSize));
//图表xy轴字体设置
plot.getDomainAxis().setLabelFont(new Font(xyFont, Font.PLAIN, xyFontSize));
plot.getDomainAxis().setTickLabelFont(new Font(xyFont, Font.PLAIN, xyFontSize));
plot.getRangeAxis().setTickLabelFont(new Font(xyFont, Font.PLAIN, xyFontSize));
plot.getRangeAxis().setLabelFont(new Font(xyFont, Font.PLAIN, xyFontSize));
//设置背景色-xy轴格子色
plot.setBackgroundPaint(ChartColor.WHITE);
plot.setRangeGridlinePaint(ChartColor.lightGray);
// plot.setDomainGridlinePaint(ChartColor.lightGray);
//折线图渲染
XYLineAndShapeRenderer renderer = new XYLineAndShapeRenderer();
plot.setRenderer(renderer);
// renderer.setPaint(ChartColor.BLACK);
chart.getLegend().setPosition(RectangleEdge.RIGHT);
}
/**
* @param dataSets int:double
* @param types 折线的种类
* @return
*/
private IntervalXYDataset getLineDataset(Map<Double, Double>[] dataSets, String[] types) {
XYSeriesCollection dataSet = new XYSeriesCollection();
int index = 0;
for (String type : types) {
XYSeries series = new XYSeries(type);
for (Map.Entry<Double, Double> data : dataSets[index++].entrySet()) {
series.add(data.getKey(), data.getValue());
}
dataSet.addSeries(series);
}
return dataSet;
}
}
结语
其实在真实生产环境中，后端已经不渲染报表图片之类了，都是后端传数据给前端，由前端来进行可视化，这里使用JFreeChart是为了后端做单元测试而编写的。