JFreechart工具类

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Font;
import java.io.IOException;
import java.text.DecimalFormat;
import java.text.NumberFormat;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

import org.apache.struts2.ServletActionContext;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.CategoryAxis;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.labels.ItemLabelAnchor;
import org.jfree.chart.labels.ItemLabelPosition;
import org.jfree.chart.labels.StandardCategoryItemLabelGenerator;
import org.jfree.chart.labels.StandardPieSectionLabelGenerator;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.PiePlot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.renderer.category.BarRenderer3D;
import org.jfree.chart.renderer.category.CategoryItemRenderer;
import org.jfree.chart.renderer.category.LineAndShapeRenderer;
import org.jfree.chart.servlet.ServletUtilities;
import org.jfree.chart.title.TextTitle;
import org.jfree.data.category.CategoryDataset;
import org.jfree.data.category.DefaultCategoryDataset;
import org.jfree.data.general.DefaultPieDataset;
import org.jfree.ui.TextAnchor;

public class JFreeChartUtil {

	/**
	 * 根据参数创建曲线图
	 * 
	 * @author HeCheng
	 * @time 2010-12-13 15:56:42
	 * 
	 * @return
	 */
	public static String[] createLineChartByCategoryDataset(
			CategoryDataset dataset, String firstTitle, String subTitle,
			int width, int height, int min, int max) {
		int pieWidth = getLineWidth(width);
		int pieHeight = getlineHeight(height);
		String fileName = "";
		String fileUrl = "";
		JFreeChart chart = ChartFactory.createLineChart(firstTitle, "", "",
				dataset, PlotOrientation.VERTICAL, true, true, true);
		chart.setBackgroundPaint(Color.white);

		// 设置子标题
		TextTitle subtitle = new TextTitle(subTitle, new Font("黑体", Font.BOLD,
				12));
		chart.addSubtitle(subtitle);
		
		Font titleFont = new Font("宋体", Font.PLAIN, 25); // 图片标题
		Font itemfont = new Font("宋体", Font.PLAIN, 15);// 图示字体
		chart.getTitle().setFont(titleFont);
		chart.getLegend().setItemFont(itemfont); // 设置最底下方框内的字体（图示）
		chart.getLegend().setVisible(false);// 不显示图示
		// 其他参数
		final CategoryPlot plot = (CategoryPlot) chart.getPlot();
		CategoryItemRenderer cgir = plot.getRenderer();
		// 在数量点上显示数值
		cgir.setBaseItemLabelsVisible(true);
		cgir.setBasePositiveItemLabelPosition(new ItemLabelPosition(
				ItemLabelAnchor.OUTSIDE12, TextAnchor.BASELINE_LEFT));
		cgir
				.setBaseItemLabelGenerator(new StandardCategoryItemLabelGenerator());
		// 设置数值字体
		cgir.setBaseItemLabelFont(new Font("Dialog", 0, 12));
		// 是否显示数值
		cgir.setBaseItemLabelsVisible(true);
		// 回传
		plot.setRenderer(cgir);
		// 背景色，线条色
		plot.setBackgroundPaint(Color.white);
		plot.setRangeGridlinePaint(Color.pink);

		// 线条属性
		NumberAxis rangeAxis = (NumberAxis) plot.getRangeAxis();
		rangeAxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());
		rangeAxis.setLowerBound(min);
		rangeAxis.setUpperBound(max);
		rangeAxis.setAutoRangeIncludesZero(false);

		// 其他属性
		final LineAndShapeRenderer renderer = (LineAndShapeRenderer) plot
				.getRenderer();
		renderer.setDrawOutlines(true);

		renderer.setSeriesStroke(0, new BasicStroke(2.0f,
				BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND, 1.0f,
				new float[] { 10.0f, 6.0f }, 0.0f));
		renderer.setSeriesStroke(1, new BasicStroke(2.0f,
				BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND, 1.0f,
				new float[] { 6.0f, 6.0f }, 0.0f));
		renderer.setSeriesStroke(2, new BasicStroke(2.0f,
				BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND, 1.0f,
				new float[] { 2.0f, 6.0f }, 0.0f));
		HttpServletRequest request = ServletActionContext.getRequest();
		HttpSession session = request.getSession();
		try {
			fileName = ServletUtilities.saveChartAsPNG(chart, pieWidth,
					pieHeight, null, session);
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		fileUrl = request.getContextPath() + "/DisplayChart?filename="
				+ fileName;
		return new String[] { fileName, fileUrl };
	}

	/**
	 * 获取曲线图默认宽度
	 * 
	 * @param width
	 * @return
	 */
	public static int getLineWidth(int width) {
		switch (width) {
		case 0:
			return 350;
		case 1:
			return 1000;
		default:
			return width;
		}
	}

	/**
	 * 获取曲线图默认高度
	 * 
	 * @param width
	 * @return
	 */
	public static int getlineHeight(int height) {
		switch (height) {
		case 0:
			return 300;
		case 1:
			return 560;
		default:
			return height;
		}
	}

	/**
	 * 根据参数创建饼图
	 * 
	 * @author HeCheng
	 * @time 2010-12-10 09:57:29
	 * @param dataset
	 * @return
	 */
	public static String[] createPieChartByDefaultPieDataset(
			DefaultPieDataset dataset, String imageName, int width, int height) {
		int pieWidth = getPieWidth(width);
		int pieHeight = getPieHeight(height);
		String fileName = "";
		String fileUrl = "";
		JFreeChart chart = ChartFactory.createPieChart(imageName, dataset,
				true, false, false);
		PiePlot pieplot = (PiePlot) chart.getPlot();

		// 设置标题栏字体
		chart.getTitle()
				.setFont(new Font("宋体", com.lowagie.text.Font.BOLD, 20));

		// 设置图块标识字体
		pieplot.setLabelFont(new Font("宋体", com.lowagie.text.Font.BOLD, 12));

		// 设置背景颜色
		pieplot.setBackgroundPaint(Color.white);

		// 设置饼图边框是否显示
		pieplot.setOutlineVisible(false);

		// 设置下方类别字体
		chart.getLegend().setItemFont(
				new Font("宋体", com.lowagie.text.Font.BOLD, 12));

		// 设置每一个方块里显示的内容，为name:数量(百分比),第2和第3个参数为格式化
		pieplot.setLabelGenerator(new StandardPieSectionLabelGenerator(
				"{0}:{1}({2}) ", NumberFormat.getNumberInstance(),
				new DecimalFormat("0.0000%")));

		HttpServletRequest request = ServletActionContext.getRequest();
		HttpSession session = request.getSession();
		try {
			fileName = ServletUtilities.saveChartAsPNG(chart, pieWidth,
					pieHeight, null, session);
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		fileUrl = request.getContextPath() + "/DisplayChart?filename="
				+ fileName;
		return new String[] { fileName, fileUrl };
	}

	/**
	 * 获取饼图默认宽度
	 * 
	 * @param width
	 * @return
	 */
	public static int getPieWidth(int width) {
		switch (width) {
		case 0:
			return 700;
		case 1:
			return 1000;
		default:
			return width;
		}
	}

	/**
	 * 获取饼图默认高度
	 * 
	 * @param width
	 * @return
	 */
	public static int getPieHeight(int height) {
		switch (height) {
		case 0:
			return 450;
		case 1:
			return 560;
		default:
			return height;
		}
	}

	/**
	 * 根据参数创建柱形图
	 * 
	 * @author HeCheng
	 * @time 2010-12-10 09:59:46
	 * @return
	 */
	public String[] createBarChartByDefaultCategoryDataset(
			DefaultCategoryDataset dataset) {
		String fileName = "";
		String fileUrl = "";
		// 第3个boolean值表示是否显示dataset的第二项
		JFreeChart chart = ChartFactory.createBarChart3D("肉类销量统计图", "四省对比情况",
				"销量", dataset, PlotOrientation.VERTICAL, true, true, true);

		CategoryPlot plot = chart.getCategoryPlot();// 获取图表区域对象
		CategoryAxis domainAxis = plot.getDomainAxis();

		// 设置标题字体
		chart.getTitle().setFont(new Font("宋体", Font.BOLD, 20));
		// 小标题字体
		domainAxis.setLabelFont(new Font("黑体", Font.BOLD, 14));
		// 各项字体（柱形下方）
		domainAxis.setTickLabelFont(new Font("宋体", Font.BOLD, 12));
		// 垂直标题
		ValueAxis rangeAxis = plot.getRangeAxis();// 获取柱状
		// 数值单位字体
		rangeAxis.setLabelFont(new Font("黑体", Font.BOLD, 15));
		// 各项字体（最下方）
		chart.getLegend().setItemFont(new Font("黑体", Font.BOLD, 15));

		CategoryPlot plot1 = chart.getCategoryPlot();
		// 设置网格背景颜色
		// plot1.setBackgroundPaint(Color.white);
		// 设置网格竖线颜色
		// plot1.setDomainGridlinePaint(Color.pink);
		// 设置网格横线颜色
		plot1.setRangeGridlinePaint(Color.pink);
		// 显示每个柱的数值，并修改该数值的字体属性
		BarRenderer3D renderer = new BarRenderer3D();
		renderer
				.setBaseItemLabelGenerator(new StandardCategoryItemLabelGenerator());
		renderer.setBaseItemLabelsVisible(true);
		// 默认的数字显示在柱子中，通过如下两句可调整数字的显示
		// 将数字显示出来
		renderer.setBasePositiveItemLabelPosition(new ItemLabelPosition(
				ItemLabelAnchor.OUTSIDE12, TextAnchor.BASELINE_LEFT));
		renderer.setItemLabelAnchorOffset(10D);
		// 设置每个地区所包含的平行柱的之间距离
		renderer.setItemMargin(0.2);
		plot1.setRenderer(renderer);

		HttpServletRequest request = ServletActionContext.getRequest();
		HttpSession session = request.getSession();
		try {
			fileName = ServletUtilities.saveChartAsPNG(chart, 500, 300, null,
					session);
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		fileUrl = request.getContextPath() + "/DisplayChart?filename="
				+ fileName;
		return new String[] { fileName, fileUrl };
	}

}