求教jFreeChart

[evangelionxb]

如题，看着比较有意思。
有没较新的教程和例子？
还有最想知道它的demo
动态刷jvm的是怎么做的！
我现在项用数据库+jfreechart+tomcat做一个。
谁能给点资料。

[JerryZhou_]

jFreeChart 我这里貌似有demo 包括五六种类型的统计图吧？
不过动态刷jvm 这个功能貌似没有...

[MJiao]

jFreeChart 去网上找个例子看看就应该没问题

[jorneyR]

下载jFreeChart后里面就有例子：jfreechart-1.0.13-demo.jar
很多的例子，例子里就可以直接看源码的。

[ccip1]

1根据需要的图形生成dataset ，
2根据数据源生成 报表的图形
3我一般都是数据流生成JPG或PNG图片

大致就是这个步骤，自己多看看API就差不多了

[evangelionxb]

package com.jfc.xb1;

import java.awt.Font;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartUtilities;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.CategoryAxis;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.title.TextTitle;
import org.jfree.data.category.CategoryDataset;
import org.jfree.data.category.DefaultCategoryDataset;

public class BarChartDemo {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub

		CategoryDataset dataset = getDataSet2();
		JFreeChart chart = ChartFactory.createBarChart3D("标题", "目录轴标签", "数值轴标签", dataset, PlotOrientation.HORIZONTAL, true, false, false);
		//ChartFactory.createBarChart3D(标题,目录轴标签,数值轴标签,数据集,图表方向，是否显示图例，是否生成工具，是否生成URL链接)
		
		//进行乱码处理
		TextTitle textTitle = chart.getTitle();
		textTitle.setFont(new Font("宋体",Font.PLAIN,20));
		
		CategoryPlot plot = chart.getCategoryPlot();
		//domainAxis为柱状图中的X轴
		CategoryAxis domainAxis = plot.getDomainAxis(); 
		//x轴标题上的字体
		domainAxis.setLabelFont(new Font("宋体",Font.PLAIN,20));
		//X轴坐标上的字体
		domainAxis.setTickLabelFont(new Font("宋体",Font.PLAIN,20));
		//处理y轴字体
		ValueAxis valueAxis = plot.getRangeAxis();
		valueAxis.setLabelFont(new Font("宋体",Font.PLAIN,20));
		valueAxis.setTickLabelFont(new Font("宋体",Font.PLAIN,20));
		
		
		plot.setNoDataMessageFont(new Font("宋体",Font.PLAIN,20));
		chart.getLegend().setItemFont(new Font("宋体",Font.PLAIN,20));
		
		
		FileOutputStream fos_jpg = null;
		
			try {
				fos_jpg = new FileOutputStream("F:\\BarChartDemo.jpg");
				ChartUtilities.writeChartAsJPEG(fos_jpg, 0.5f, chart, 400, 300, null);
			} catch (FileNotFoundException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			} finally{
				try{
					fos_jpg.close();
				}catch(Exception e){
					
				}
			}	
	}
	
	//获取一个组合型数据集对象
	private static CategoryDataset getDataSet2(){
		DefaultCategoryDataset dataset = new DefaultCategoryDataset();
		dataset.addValue(100, "北京", "苹果");
		dataset.addValue(100, "上海", "苹果");
		dataset.addValue(200, "北京", "栗子");
		dataset.addValue(200, "上海", "栗子");
		dataset.addValue(300, "北京", "葡萄");
		dataset.addValue(300, "上海", "葡萄");
		dataset.addValue(400, "北京", "西瓜");
		dataset.addValue(400, "上海", "西瓜");
		dataset.addValue(500, "北京", "香蕉");
		dataset.addValue(500, "上海", "香蕉");

		return dataset;
	}
	
}

目录轴标签 这几个字的方向有点小问题啊

[evangelionxb]

package com.jfc.servlet;

import java.awt.Font;
import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartUtilities;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.plot.PiePlot;
import org.jfree.chart.title.TextTitle;
import org.jfree.data.general.DefaultPieDataset;
import org.jfree.data.general.PieDataset;
import org.jfree.data.jdbc.JDBCPieDataset;

/**
 * Servlet implementation class for Servlet: PieByServlet
 *
 */
 public class PieByServlet extends javax.servlet.http.HttpServlet implements javax.servlet.Servlet {
   static final long serialVersionUID = 1L;
   
    /* (non-Java-doc)
	 * @see javax.servlet.http.HttpServlet#HttpServlet()
	 */
	public PieByServlet() {
		super();
	}   	
	
	/* (non-Java-doc)
	 * @see javax.servlet.http.HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
	}  	
	
	/* (non-Java-doc)
	 * @see javax.servlet.http.HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
	}   
	protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException{
		response.setCharacterEncoding("gbk");
		response.setContentType("image/jpeg");
		PieDataset pd = getDataset();
		JFreeChart jfc = ChartFactory.createPieChart3D("chart标题", pd, true, true, false);
		//乱码解决部分
		TextTitle textTitle = jfc.getTitle();
		textTitle.setFont(new Font("宋体",Font.PLAIN,20));
		
		PiePlot plot = (PiePlot) jfc.getPlot();
		plot.setLabelFont(new Font("宋体",Font.BOLD,20));
		
		jfc.getLegend().setItemFont(new Font("宋体",Font.PLAIN,12));
		//
		ChartUtilities.writeChartAsJPEG(response.getOutputStream(),0.5f,jfc,800,600,null);
		
	}

	private PieDataset getDataset() {
		// TODO Auto-generated method stub
		Connection con = null;
		JDBCPieDataset dataset = null;
		try {
			Class.forName("com.mysql.jdbc.Driver").newInstance();
			String url = "jdbc:mysql://127.0.0.1:3306/xb1?user=root&password=sa";
			con = DriverManager.getConnection(url);
			String query = "select name,score from student";
			dataset = new JDBCPieDataset(con);
			dataset.executeQuery(query);
		} catch (InstantiationException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IllegalAccessException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (ClassNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} finally{
			
		}
		return dataset; 
	}
}

用mysql做的简单的例子
jdbc时候和app不一样就在于dataset不一样，其他的不是很难。
加油