高分求解java动态生成下面的甘特图图片

Question

http://49.images22.51img1.com/6000/a502086525/9790805a52e37ce0cd5e2ed0efeaba34.jpg[/url]http://44.images22.51img1.com/6000/a502086525/4873318f43771e96752800eeb4ac9282.gif图片都是一样的，防止无法显示图片。
求用java生成所示图片，数据都是动态的.
可以提供下载列子，可以提供代码参考.http://44.images22.51img1.com/6000/a502086525/4873318f43771e96752800eeb4ac9282.gif
[url=http://49.images22.51img1.com/6000/a502086525/9790805a52e37ce0cd5e2ed0efeaba34.jpg]

Answer 1

利用JAVA绘图动态生成图片发送到客户端IE
package com.gepower.ps.eps.topissuesadmin.common; 
import java.awt.*; 
import java.awt.geom.Line2D; 
import java.awt.image.BufferedImage; 
import java.io.IOException; 
import javax.imageio.IIOException; 
import javax.imageio.ImageIO; 
import javax.servlet.ServletException; 
import javax.servlet.http.*; 
import org.apache.commons.lang.NumberUtils; 
/** 
* 
* <p> 
* Title: TIMT 
* </p> 
* <p> 
* Description: 2008-03 
* </p> 
* <p> 
* Copyright: Copyright (c) 2006 
* </p> 
* <p> 
* Company: TCS 
* </p> 
* 
* @author Xujin.Jiao 
* @version 4.0 
*/ 
public class CinScoreImgServlet extends HttpServlet { 
public static final long serialVersionUID = 123888839L; 
    public CinScoreImgServlet() { 
    } 
    public void init() throws ServletException { 
        super.init(); 
    } 
    public void destroy() { 
        super.destroy(); 
    } 
    protected void doGet(HttpServletRequest request, HttpServletResponse response) 
                   throws ServletException, IOException { 
        process(request, response); 
    } 
    protected void doPost(HttpServletRequest request, HttpServletResponse response) 
                   throws ServletException, IOException { 
        process(request, response); 
    } 
    protected void process(HttpServletRequest request, HttpServletResponse response) 
                   throws ServletException, IOException { 
     boolean drawTriangle = true; 
  int width = TopIssueAdminConstants.CIN_IMAGE_WIDTH; 
  int height = TopIssueAdminConstants.CIN_IMAGE_HEIGHT; 
        int halfTrag = (int)Math.round(height / Math.sqrt(3d)); 
  int axisWidth = width - halfTrag; 
  int cinScore = 0; 
  int tragXpos = axisWidth; 
  String cinScoreStr = request.getParameter("cinScore"); 
  if (null != cinScoreStr && cinScoreStr.trim().length() > 0) { 
   try { 
    if (!NumberUtils.isNumber(cinScoreStr)) { 
     drawTriangle = false; 
    } else if (Integer.parseInt(cinScoreStr) < 0) { 
     drawTriangle = false; 
    } else { 
        cinScore = Integer.parseInt(cinScoreStr); 
        tragXpos = axisWidth - (int)Math.round((cinScore * axisWidth) / TopIssueAdminConstants.MAX_CIN_SCORE); 
    } 
   } catch (Exception e) { 
    drawTriangle = false; 
    EPSLogger.debug("process() : Error in CinScoreImgServlet : "+ e.getMessage()); 
   } 
  } 
  BufferedImage bi = new BufferedImage(width, height, 
                                 BufferedImage.TYPE_INT_RGB); 
  Graphics2D g2 = (Graphics2D)bi.getGraphics(); 
  g2.setBackground(Color.WHITE); 
  g2.clearRect(0, 0, width, height); 
     g2.setColor(Color.black); 
     g2.drawLine(0, 0, 0, height); 
     g2.drawLine(axisWidth / 2, 0, axisWidth / 2, height); 
     g2.drawLine(axisWidth, 0, axisWidth, height); 
     float dashes[] = {10, 2}; 
     g2.setPaint(Color.black); 
     g2.setStroke(new BasicStroke(1, BasicStroke.CAP_BUTT, 
                            BasicStroke.JOIN_MITER, 
                                  10, dashes, 0 )); 
     g2.draw(new Line2D.Double(0, height / 2, axisWidth, height / 2)); 
     if (drawTriangle) { 
   int xValues[] = {tragXpos, tragXpos + halfTrag, tragXpos - halfTrag}; 
   int yValues[] = {0, height, height}; 
   g2.setColor(Color.CYAN); 
   g2.fillPolygon(xValues, yValues, 3); 
     } 
        response.setContentType("image/jpg"); 
        try { 
      ImageIO.write(bi, "jpg", response.getOutputStream()); 
        } catch(IIOException ex) { 
         EPSLogger.debug("process() : Error in CinScoreImgServlet : "+ ex.getMessage()); 
        } 
    } 
} 
在web.xml中加上这个: 
================================================================== 
<servlet> 
    <servlet-name>DisplayCinImage</servlet-name> 
    <servlet-class>com.gepower.ps.eps.topissuesadmin.common.CinScoreImgServlet</servlet-class> 
</servlet> <servlet-mapping> 
    <servlet-name>DisplayCinImage</servlet-name> 
    <url-pattern>/servlet/DisplayCinImage</url-pattern> 
</servlet-mapping> 
JSP中这样使用: 
=============================================================== 
<td align="center"> 
  <img src="<%=request.getContextPath()%>/servlet/DisplayCinImage?cinScore=<%=roundOff(tMB.getCinScore())%>" alt="CIN Score=<%=roundOff(tMB.getCinScore())%>" /> 
</td> 

Answer 2

对坐标轴比较感兴趣，写了一个坐标轴的，其他的部分相对简单一些，看完这个，应该就会做了import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.RenderingHints;
import java.awt.Stroke;
import java.awt.geom.GeneralPath;import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;@SuppressWarnings("serial")
public class CoordinateSystem extends JPanel {
    private int unitSize = 20;
    private int ox = 100; // 原点的横坐标
    private int oy = 100; // 原点的纵坐标
    private int originalPaddingLeft = 110; // 原点离窗口左边的距离
    private int originalPaddingBottom = 110; // 原点离窗口底部的距离    public CoordinateSystem() {
        setBackground(Color.WHITE);
    }    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2d = (Graphics2D) g;
        g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);        ox = originalPaddingLeft;
        oy = getHeight() - originalPaddingBottom;
        g2d.translate(ox, oy);
        g2d.scale(1, -1);        // 绘制坐标系
        drawGrid(g2d);
        drawAxis(g2d);
    }    // 绘制网格线
    private void drawGrid(Graphics2D g2d) {
        Paint oldPaint = g2d.getPaint();
        Stroke oldStroke = g2d.getStroke();        g2d.setPaint(Color.decode("#CCCCCC"));
        Stroke stroke = new BasicStroke(1, BasicStroke.CAP_BUTT, BasicStroke.JOIN_BEVEL, 0,
            new float[] { 4, 2 }, 0);
        g2d.setStroke(stroke);        int ww = getWidth();
        int wh = getHeight();        // 绘制横线
        for (int y = 0; y < oy + unitSize; y += unitSize) {
            g2d.drawLine(-ox, y, ww - ox, y);
        }
        for (int y = -unitSize; y > -(wh - oy) - unitSize; y -= unitSize) {
            g2d.drawLine(-ox, y, ww - ox, y);
        }        // 绘制纵线
        for (int x = 0; x < ww - ox + unitSize; x += unitSize) {
            g2d.drawLine(x, oy, x, -(wh - oy));
        }
        for (int x = -unitSize; x > -(ww - ox) - unitSize; x -= unitSize) {
            g2d.drawLine(x, oy, x, -(wh - oy));
        }        g2d.setPaint(oldPaint);
        g2d.setStroke(oldStroke);
    }    // 绘制坐标轴
    private void drawAxis(Graphics2D g2d) {
        Paint oldPaint = g2d.getPaint();
        Stroke oldStroke = g2d.getStroke();        g2d.setStroke(new BasicStroke(1));
        int tw = 13;
        int th = 4;
        int endX = unitSize * 14;
        int endY = unitSize * 10;        // 绘制横坐标轴
        GeneralPath triangle = new GeneralPath();
        triangle.moveTo(endX, 0);
        triangle.lineTo(endX - tw, th);
        triangle.lineTo(endX - tw, -th);
        triangle.closePath();
        g2d.setPaint(Color.decode("#000000"));
        g2d.drawLine(0, 0, endX, 0);
        g2d.fill(triangle);        // 绘制纵坐标轴
        triangle.moveTo(0, endY);
        triangle.lineTo(th, endY - tw);
        triangle.lineTo(-th, endY - tw);
        triangle.closePath();
        g2d.drawLine(0, 0, 0, endY);
        g2d.fill(triangle);        g2d.setPaint(oldPaint);
        g2d.setStroke(oldStroke);
    }    private static void createGuiAndShow() {
        JFrame frame = new JFrame("");
        frame.getContentPane().add(new CoordinateSystem());        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(500, 400);
        frame.setAlwaysOnTop(true);
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                createGuiAndShow();
            }
        });
    }
}class Task {
    int startDay;
    int duration;    public Task(int startDay, int duration) {
        this.startDay = startDay;
        this.duration = duration;
    }
}