使用jfreechart統計資料，生成折線圖（座標x,y值大小可以自己設定）
阿新 • • 發佈：2019-02-08
需求：一個目錄下包含多個txt檔案，每個txt檔案每行儲存一個數據，根據每個txt檔案的資料生成一個折線圖，y軸為每行的資料，x軸表示第幾行。
b.建立新的java工程時，依賴這2個jar包。
c.相關jfreechart介紹:
org.jfree.chart.ChartFactory ：得到各種型別chart的工廠類
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 (nullpermitted).xAxisLabel- a label for the X-axis (nullpermitted).yAxisLabel- a label for the Y-axis (nullpermitted).dataset- the dataset for the chart (nullpermitted).orientation- the plot orientation (horizontal or vertical) (nullNOT 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.
GetData.java 處理資料
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 {
//從一個txt檔案中讀取資料
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;
}
//求陣列元素的平均值
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 {
// 儲存為影象檔案
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);
// 儲存為PNG
ChartUtilities.writeChartAsPNG(out, chart, weight, height);
//儲存為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
}
}
}
}
//介面名
static String interfaceName;
public static XYSeriesCollection createDataSet(String fileName) {
//要處理的txt檔案的路徑
String path = "e:\\interfaceTest\\gz\\" + fileName;
//獲取介面名
String result = path.substring(0,path.length()-4);
interfaceName = result.substring(20, result.length());
//獲取資料，放到陣列中
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 + "介面，平均響應時間：" + 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("響應時間統計", //圖表標題
"介面呼叫次數", //X軸標題
"響應時間（毫秒）", //Y軸標題
createDataSet(fileName), //繪圖資料集
PlotOrientation.VERTICAL, //繪製方向
true, //顯示圖例
true, //採用標準生成器
false); //是否生成超連結
//ChartFrame frame=new ChartFrame("介面響應時間統計",chart);
//設定標題字型
chart.getTitle().setFont(new Font("宋體", Font.BOLD, 15));
chart.getLegend().setItemFont(new Font("黑體", Font.BOLD, 15)); // 設定圖例類別字型
//獲取圖表區域物件
XYPlot plot = (XYPlot) chart.getPlot();
ValueAxis domainAxis=plot.getDomainAxis();
domainAxis.setTickLabelFont(new Font("黑體", Font.BOLD, 15));
/*------設定X軸座標上的文字-----------*/
domainAxis.setTickLabelFont(new Font("黑體", Font.PLAIN, 11));
/*------設定X軸的標題文字------------*/
domainAxis.setLabelFont(new Font("宋體", Font.PLAIN, 12));
NumberAxis numberaxis = (NumberAxis) plot.getRangeAxis();
/*------設定Y軸座標上的文字-----------*/
numberaxis.setTickLabelFont(new Font("黑體", Font.PLAIN, 12));
/*------設定Y軸的標題文字------------*/
numberaxis.setLabelFont(new Font("宋體", Font.PLAIN, 12));
//終端顯示
//frame.pack();
//frame.setVisible(true);
System.out.println(interfaceName);
//儲存影象的大小
int weight = 800;
int height = 600;
//存放影象的目錄
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的目錄
File file = new File("e:\\interfaceTest\\gz\\");
if(file.isDirectory())
{
File[] files = file.listFiles();
for(File myFile:files)
{
if(myFile.isFile())
{
createLineChart(myFile.getName());
}
}
}
}
}生成的圖，如下：
