jfreechat frame 折线图实现

 

package com.test.jfree;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartFrame;
import org.jfree.chart.ChartUtilities;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.data.category.CategoryDataset;
import org.jfree.data.general.DatasetUtilities;

//JFreeChart Line Chart（折线图）    
public class CreateJFreeChartLine {

    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, "c:\\line.jpg", 600, 400);
        ChartFrame preview = new ChartFrame("zs information",freeChart); 
        preview.setSize(1000,400);
        preview.setVisible(true);
    }

    // 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
            // ChartUtilities.writeChartAsPNG(out, chart, 600, 400);
            // 保存为JPEG
            ChartUtilities.writeChartAsJPEG(out, chart, 600, 400);
            out.flush();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (out != null) {
                try {
                    out.close();
                } catch (IOException e) {
                    // do nothing
                }
            }
        }
    }

    // 根据CategoryDataset创建JFreeChart对象
    public static JFreeChart createChart(CategoryDataset categoryDataset) {
        // 创建JFreeChart对象：ChartFactory.createLineChart
        JFreeChart jfreechart = ChartFactory.createLineChart("titles", // 标题
                "years", // categoryAxisLabel （category轴，横轴，X轴标签）
                "total", // valueAxisLabel（value轴，纵轴，Y轴的标签）
                categoryDataset, // dataset
                PlotOrientation.VERTICAL, true, // legend
                false, // tooltips
                false); // URLs

        // 使用CategoryPlot设置各种参数。以下设置可以省略。
        CategoryPlot plot = (CategoryPlot) jfreechart.getPlot();
        // 背景色 透明度
        plot.setBackgroundAlpha(0.5f);
        // 前景色 透明度
        plot.setForegroundAlpha(0.5f);
        // 其他设置 参考 CategoryPlot类

        return jfreechart;
    }

    public static CategoryDataset createDataset() {

        String[] rowKeys = { "A_tip" };
        String[] colKeys = { "0:00", "1:00", "2:00", "7:00", "8:00", "9:00",
                "10:00", "11:00", "12:00", "13:00", "16:00", "20:00", "21:00",
                "23:00" };

        double[][] data = { { 1.5, 3, 50, 1, 1, 1, 2, 20, 2, 1, 3, 2, 1, 1 }
         };

        // 或者使用类似以下代码
        // DefaultCategoryDataset categoryDataset = new
        // DefaultCategoryDataset();
        // categoryDataset.addValue(10, "rowKey", "colKey");
        return DatasetUtilities.createCategoryDataset(rowKeys, colKeys, data);
    }
}