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需求：一个目录下包含多个txt文件，每个txt文件每行保存一个数据，根据每个txt文件的数据生成一个折线图，y轴为每行的数据，x轴表示第几行。
a.先下载依赖的jar包：jfreechart-1.0.17.jar，jcommon-1.0.21.jar 。
b.创建新的java工程时，依赖这2个jar包。
c.相关jfreechart介绍:
org.jfree.chart.ChartFactory ：得到各种类型chart的工厂类
本例中使用createXYLineChart，原型如下：
public static JFreeChart createXYLineChart(java.lang.String title,
java.lang.String xAxisLabel,
java.lang.String yAxisLabel,
XYDataset dataset,
PlotOrientation orientation,
boolean legend,
boolean tooltips,
boolean urls)
-
Creates a line chart (based on an
XYDataset) with default settings.
-
Parameters:
-
title - the chart title (
null permitted).
-
xAxisLabel - a label for the X-axis (
null permitted).
-
yAxisLabel - a label for the Y-axis (
null permitted).
-
dataset - the dataset for the chart (
null permitted).
-
orientation - the plot orientation (horizontal or vertical) (
null NOT permitted).
-
legend - a flag specifying whether or not a legend is required.
-
tooltips - configure chart to generate tool tips?
-
urls - configure chart to generate URLs?
Returns:
-
The chart.
实现如下：
GetData.java 处理数据
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
public class GetData {
//从一个txt文件中读取数据
public static List writeToData(String path) {
File file = new File(path);
List list = new ArrayList();
try {
BufferedReader bw = new BufferedReader(new FileReader(file));
String line = null;
//先存入list集合中
while((line = bw.readLine()) != null){
list.add(line);
}
bw.close();
} catch (IOException e) {
e.printStackTrace();
}
return list;
}
//求数组元素的平均值
public static double average(double table[]) {
double sum=0.0;
for (int i=0;i<table.length;i++) {
sum += table[i];
}
return sum / table.length;
}
}
LineChart.java
import java.awt.Font;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.List;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartFrame;
import org.jfree.chart.ChartUtilities;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.XYPlot;
import org.jfree.data.xy.XYSeries;
import org.jfree.data.xy.XYSeriesCollection;
public class LineChart {
// 保存为图像文件
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
ChartUtilities.writeChartAsPNG(out, chart, weight, height);
//保存为JPEG
//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
}
}
}
}
//接口名
static String interfaceName;
public static XYSeriesCollection createDataSet(String fileName) {
//要处理的txt文件的路径
String path = "e:\\interfaceTest\\gz\\" + fileName;
//获取接口名
String result = path.substring(0,path.length()-4);
interfaceName = result.substring(20, result.length());
//获取数据，放到数组中
List list = GetData.writeToData(path);
double[] nums = new double[list.size()];
for(int k=0; k < list.size(); k++){
String s = (String) list.get(k);
nums[k] = Double.parseDouble(s);
}
double ave = GetData.average(nums);
System.out.println("ave: " + ave);
XYSeriesCollection seriesCollection = new XYSeriesCollection();
XYSeries series1 = new XYSeries(interfaceName + "接口，平均响应时间：" + ave + "ms");
for(int i=0; i < list.size(); i++){
series1.add(i, nums[i]);
}
seriesCollection.addSeries(series1);
return seriesCollection;
}
public static void createLineChart(String fileName) {
JFreeChart chart = ChartFactory.createXYLineChart("响应时间统计", //图表标题
"接口调用次数", //X轴标题
"响应时间（毫秒）", //Y轴标题
createDataSet(fileName), //绘图数据集
PlotOrientation.VERTICAL, //绘制方向
true, //显示图例
true, //采用标准生成器
false); //是否生成超链接
//ChartFrame frame=new ChartFrame("接口响应时间统计",chart);
//设置标题字体
chart.getTitle().setFont(new Font("宋体", Font.BOLD, 15));
chart.getLegend().setItemFont(new Font("黑体", Font.BOLD, 15)); // 设置图例类别字体
//获取图表区域对象
XYPlot plot = (XYPlot) chart.getPlot();
ValueAxis domainAxis=plot.getDomainAxis();
domainAxis.setTickLabelFont(new Font("黑体", Font.BOLD, 15));
/*------设置X轴坐标上的文字-----------*/
domainAxis.setTickLabelFont(new Font("黑体", Font.PLAIN, 11));
/*------设置X轴的标题文字------------*/
domainAxis.setLabelFont(new Font("宋体", Font.PLAIN, 12));
NumberAxis numberaxis = (NumberAxis) plot.getRangeAxis();
/*------设置Y轴坐标上的文字-----------*/
numberaxis.setTickLabelFont(new Font("黑体", Font.PLAIN, 12));
/*------设置Y轴的标题文字------------*/
numberaxis.setLabelFont(new Font("宋体", Font.PLAIN, 12));
//终端显示
//frame.pack();
//frame.setVisible(true);
System.out.println(interfaceName);
//保存图像的大小
int weight = 800;
int height = 600;
//存放图像的目录
String outputPath = "e:\\interfaceTest\\imgs\\" + interfaceName + ".png";
//String outputPath = "d:\\interface\\imgs\\" + interfaceName + ".png";
LineChart.saveAsFile(chart, outputPath, weight, height);
}
public static void main(String[] args) {
//存放.txt的目录
File file = new File("e:\\interfaceTest\\gz\\");
if(file.isDirectory())
{
File[] files = file.listFiles();
for(File myFile:files)
{
if(myFile.isFile())
{
createLineChart(myFile.getName());
}
}
}
}
}
生成的图，如下：
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