JFreeChart生成折线图（生成图片本地保存，有解决中文乱码的通用方法）

package jfreechart;
import java.awt.Color;
import java.awt.Font;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.text.SimpleDateFormat;

import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartUtilities;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.plot.XYPlot;
import org.jfree.data.time.Month;
import org.jfree.data.time.TimeSeries;
import org.jfree.data.time.TimeSeriesCollection;
import org.jfree.ui.RectangleInsets;
import org.jfree.chart.renderer.xy.XYLineAndShapeRenderer;
import org.jfree.chart.renderer.xy.XYItemRenderer;
import org.jfree.chart.axis.DateAxis;
import org.jfree.chart.labels.*;
import org.jfree.ui.*;

/**
 * 创建JFreeChart Line Chart（折线图）
 */
public class CopyOfCreateJFreeChartLine {
	public static void main(String[] args) {
		// 步骤1：创建CategoryDataset对象（准备数据）
		TimeSeriesCollection 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://jfreechart//testline.png", 500, 300);
	}

	// 创建TimeSeriesCollection对象
	public static TimeSeriesCollection createDataset() {
		TimeSeriesCollection lineDataset = new TimeSeriesCollection();
		TimeSeries timeSeries = new TimeSeries("统计");
		timeSeries.add(new Month(1, 2007), 11200);
		timeSeries.add(new Month(2, 2007), 9000);
		timeSeries.add(new Month(3, 2007), 6200);
		timeSeries.add(new Month(4, 2007), 8200);
		timeSeries.add(new Month(5, 2007), 8200);
		timeSeries.add(new Month(6, 2007), 12200);
		timeSeries.add(new Month(7, 2007), 13200);
		timeSeries.add(new Month(8, 2007), 8300);
		timeSeries.add(new Month(9, 2007), 12400);
		timeSeries.add(new Month(10, 2007), 12500);
		timeSeries.add(new Month(11, 2007), 13600);
		timeSeries.add(new Month(12, 2007), 12500);
		
		TimeSeries timeSeries1 = new TimeSeries("统计1");
		timeSeries1.add(new Month(1, 2007), 112001);
		timeSeries1.add(new Month(2, 2007), 90001);
		timeSeries1.add(new Month(3, 2007), 62001);
		timeSeries1.add(new Month(4, 2007), 82001);
		timeSeries1.add(new Month(5, 2007), 82001);
		timeSeries1.add(new Month(6, 2007), 122001);
		timeSeries1.add(new Month(7, 2007), 132001);
		timeSeries1.add(new Month(8, 2007), 83001);
		timeSeries1.add(new Month(9, 2007), 124001);
		timeSeries1.add(new Month(10, 2007), 125001);
		timeSeries1.add(new Month(11, 2007), 136001);
		timeSeries1.add(new Month(12, 2007), 125001);
		
		lineDataset.addSeries(timeSeries);
		lineDataset.addSeries(timeSeries1);
		return lineDataset;
	}

	// 根据CategoryDataset生成JFreeChart对象
	public static JFreeChart createChart(TimeSeriesCollection lineDataset) {
		JFreeChart jfreechart = ChartFactory.createTimeSeriesChart(
				"统计", 		// 标题
				"月份", 		// categoryAxisLabel （category轴，横轴，X轴的标签）
				"访问量", 	// valueAxisLabel（value轴，纵轴，Y轴的标签）
				lineDataset,// dataset
				true, 		// legend
				true, 		// tooltips
				true); 		// URLs


		// 配置字体（解决中文乱码的通用方法）
		Font xfont = new Font("宋体", Font.PLAIN, 16); // X轴
		Font yfont = new Font("宋体", Font.PLAIN, 16); // Y轴
		Font kfont = new Font("宋体", Font.PLAIN, 14); // 底部
		Font titleFont = new Font("隶书", Font.BOLD, 20); // 图片标题

		jfreechart.setBackgroundPaint(Color.white);
		XYPlot xyplot = (XYPlot) jfreechart.getPlot(); // 获得 plot：XYPlot！

		xyplot.getDomainAxis().setLabelFont(xfont);
		xyplot.getRangeAxis().setLabelFont(yfont);
		jfreechart.getLegend().setItemFont(kfont);
		jfreechart.getTitle().setFont(titleFont);
		
		//设置时间格式，同时也解决了乱码问题
		DateAxis dateaxis = (DateAxis)xyplot.getDomainAxis();
		SimpleDateFormat sfd = new SimpleDateFormat("yy-MM");
		dateaxis.setDateFormatOverride(sfd);
		xyplot.setDomainAxis(dateaxis);

		// 以下的设置可以由用户定制，也可以省略
		XYPlot plot = (XYPlot) jfreechart.getPlot();
		XYLineAndShapeRenderer xylineandshaperenderer = (XYLineAndShapeRenderer) plot.getRenderer();
		// 设置网格背景颜色
		plot.setBackgroundPaint(Color.white);
		// 设置网格竖线颜色
		plot.setDomainGridlinePaint(Color.pink);
		// 设置网格横线颜色
		plot.setRangeGridlinePaint(Color.pink);
		// 设置曲线图与xy轴的距离
		plot.setAxisOffset(new RectangleInsets(0D, 0D, 0D, 10D));
		// 设置曲线是否显示数据点
//		xylineandshaperenderer.setBaseShapesVisible(true);
		// 设置曲线显示各数据点的值
//		XYItemRenderer xyitem = plot.getRenderer();
//		xyitem.setBaseItemLabelsVisible(true);
//		xyitem.setBasePositiveItemLabelPosition(new ItemLabelPosition(
//				ItemLabelAnchor.OUTSIDE12, TextAnchor.BASELINE_LEFT));
//		xyitem.setBaseItemLabelGenerator(new StandardXYItemLabelGenerator());
//		xyitem.setBaseItemLabelFont(new Font("Dialog", 1, 14));
//		plot.setRenderer(xyitem);

		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, 600, 350);
			// 保存为JPEG文件
		    //ChartUtilities.writeChartAsJPEG(out, chart, 500, 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
				}
			}
		}
	}

}