Prefuse学习(二)从数据库中读取数据

prefuse是一个非常不错的开源可视化项目，尤其是用在social network/complex network上，个人感觉要比jung好。不过可惜的是，prefuse的user manual还在建设中，并且google resource也少得可怜。好在开源提供了源码，只好看源码了，呵呵。
prefuse user manual上提供了一个简单的例子，这个例子的数据来自一个符合GraphML标准的xml文件（socialnet.xml），大致内容如下：
xml 代码

-- phpMyAdmin SQL Dump
-- version 2.11.10
-- http://www.phpmyadmin.net --
-- 主机: localhost
-- 生成日期: 2010 年 07 月 06 日 03:24
-- 服务器版本: 5.0.22
-- PHP 版本: 5.2.13

SET SQL_MODE="NO_AUTO_VALUE_ON_ZERO";

--
-- 数据库: `test`
--

-- --------------------------------------------------------

--
-- 表的结构 `node`
--

CREATE TABLE IF NOT EXISTS `node` (
  `id` int(10) unsigned NOT NULL auto_increment,
  `name` varchar(45) NOT NULL,
  `gender` varchar(45) NOT NULL,
  PRIMARY KEY  (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 AUTO_INCREMENT=8 ;

--
-- 导出表中的数据 `node`
--

INSERT INTO `node` (`id`, `name`, `gender`) VALUES
(1, 'cuiran', 'boy'),
(2, 'aojuan', 'girl'),
(3, 'zhangsan', 'boy'),
(4, 'lisi', 'girl'),
(5, 'aomiao', 'girl'),
(6, 'aoqian', 'girl'),
(7, 'wangwu', 'boy');

package com.cayden.prefuse;

import javax.swing.JFrame;

import prefuse.Constants;
import prefuse.Display;
import prefuse.Visualization;
import prefuse.action.ActionList;
import prefuse.action.RepaintAction;
import prefuse.action.assignment.ColorAction;
import prefuse.action.assignment.DataColorAction;
import prefuse.action.layout.graph.ForceDirectedLayout;
import prefuse.activity.Activity;
import prefuse.controls.DragControl;
import prefuse.controls.NeighborHighlightControl;
import prefuse.controls.PanControl;
import prefuse.controls.ZoomControl;
import prefuse.data.Graph;
import prefuse.data.Table;
import prefuse.data.io.sql.ConnectionFactory;
import prefuse.data.io.sql.DatabaseDataSource;
import prefuse.render.DefaultRendererFactory;
import prefuse.render.LabelRenderer;
import prefuse.util.ColorLib;
import prefuse.visual.VisualItem;

public class TestMySql {
	 public static final String driverName   = "com.mysql.jdbc.Driver";    
	    public static final String dbURL        = "jdbc:mysql://localhost:3306/test";    
	    public static final String userName     = "root";    
	    public static final String userPwd      = "root";    
	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		 DatabaseDataSource datasrc = null;    
         
	        try {    
	            //get database connection    
	            datasrc = ConnectionFactory.getDatabaseConnection(    
	                    driverName, dbURL, userName, userPwd);    
	                
	            //create a table of data    
	            Table nodes = datasrc.getData("select * from node");    
	            Table edges = datasrc.getData("select * from edge");    
	                
	            Graph graph = new Graph(nodes, edges, false, "id", "sid", "tid");    
	                
	            Visualization vis = new Visualization();    
	            vis.add("graph", graph);    
	                
	            LabelRenderer r = new LabelRenderer("name");    
	            r.setRoundedCorner(8, 8);    
	            vis.setRendererFactory(new DefaultRendererFactory(r));    
	                
	            int[] palette = new int[] {    
	                    ColorLib.rgb(255,180,180), ColorLib.rgb(190,190,255)    
	            };    
	                
	            DataColorAction fill = new DataColorAction("graph.nodes", "gender",    
	                    Constants.NOMINAL, VisualItem.FILLCOLOR, palette);    
	            ColorAction textColor = new ColorAction("graph.nodes",    
	                    VisualItem.TEXTCOLOR, ColorLib.gray(0));    
	            ColorAction edgesColor = new ColorAction("graph.edges",    
	                    VisualItem.STROKECOLOR, ColorLib.gray(200));    
	                
	            ActionList color = new ActionList();    
	            color.add(fill);    
	            color.add(textColor);    
	            color.add(edgesColor);    
	                
	            ActionList layout = new ActionList(Activity.INFINITY);    
	            layout.add(new ForceDirectedLayout("graph"));    
	            layout.add(new RepaintAction());    
	                
	            vis.putAction("color", color);    
	            vis.putAction("layout", layout);    
	                
	            Display d = new Display(vis);    
	            d.setSize(720, 500);    
	            d.addControlListener(new DragControl());    
	            d.addControlListener(new PanControl());    
	            d.addControlListener(new ZoomControl());    
	            d.addControlListener(new NeighborHighlightControl());    
	                
	            JFrame frame = new JFrame("Prefuse");    
	            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);    
	            frame.setSize(800, 600);    
	            frame.add(d);    
	            frame.setVisible(true);    
	                
	            vis.run("color");    
	            vis.run("layout");    
	        } catch (Exception e) {    
	            e.printStackTrace();    
	        }    

	}
}

运行后效果图:

下载地址：http://vdisk.weibo.com/s/bVYuL http://pan.baidu.com/s/1JIGZ 这里也收藏了一些应用下载地址：http://pan.baidu.com/s/1EFsKn 针对下面很多评论提到了是否支持中文因为上面采用的是MySQL可能在 显示的时候中文会乱码，需要在连接的url上加上字符集 utf-8我后来在SQL2005上测试 中文也可以显示。附图片：