jsp页面中画图

可以的不过要用servlet画的，

import java.awt.image.*,java.util.*,javax.imageio.*

好象是这些包楼主可能要自己试一下,不清楚对不对的

response.setContenType("image/jpeg")

// 在内存中创建图象，可以想象成一个画板大小是20mm长，60mm宽

int width=60, height=20

BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB)

// 获取图形上下文,g想象成一个画笔

Graphics g = image.getGraphics()

//生成随机类

Random random = new Random()

//画线 x,y是坐标

g.drawLine(x,y,x+xl,y+yl)

//随即声成颜色

g.setColor(new Color(20+random.nextInt(110),20+random.nextInt(110),20+random.nextInt(110)))

//调用函数出来的颜色相同，可能是因为种子太接近，所以只能直接生成

g.drawString(“画图”）在画版中画一个字符串，

}

还有画圆画方的很多方法，楼主可以试试

// 图象生效

g.dispose()

// 输出图象到页面

ImageIO.write(image, "JPEG", response.getOutputStream())

然后页面用<img src="servlet的url地址得到这幅画"/>

简单的可以用java.awt.geom java.awt.image 这两个包

// 清空缓冲区

response.reset()

// 注意这里的MIME类型

response.setContentType("image/png")

// 创建一个 610X400 的图像

int width = 610, height = 400

BufferedImage image = new BufferedImage(width, height,

BufferedImage.TYPE_INT_RGB)

// 创建Java2D对象

/**

Graphics g = image.getGraphics()

Graphics2D g2d = (Graphics2D)g

*/

Graphics2D g2d = image.createGraphics()

// 填充背景

g2d.setColor(Color.WHITE)

g2d.fillRect(0, 0, width, height)

// 绘制新背景

GradientPaint grayGP = new GradientPaint(0, 0, Color.GRAY, width, height,

new Color(200, 200, 200), false)

g2d.setPaint(grayGP)

g2d.fillRoundRect(20, 20, width - 20, height - 20, 50, 50)

g2d.setPaint(Color.WHITE)

g2d.fillRoundRect(12, 12, width - 20, height - 20, 50, 50)

BasicStroke bs = new BasicStroke(4.0f)

g2d.setStroke(bs)

g2d.setPaint(new Color(53, 76, 112))

g2d.drawRoundRect(12, 12, width - 20, height - 20, 50, 50)

GradientPaint blueGP = new GradientPaint(120, 60, new Color(215, 230, 252),

120, 300, Color.WHITE, false)

g2d.setPaint(blueGP)

g2d.fillRect(120, 60, 440, 300)

// 绘制图表标题

String chartTitle = "计算机编程类图书2004年月销售量统计图"

g2d.setFont(new Font("方正粗宋简体", Font.PLAIN, 22))

g2d.setColor(Color.BLACK)

g2d.drawString(chartTitle, 140, 40)

// 创建虚线笔划

float[]dashes = { 3.f }

bs = new BasicStroke(1.0f, BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND,

10, dashes, 0)

g2d.setStroke(bs)

g2d.setFont(new Font("Courier New", Font.PLAIN, 12))

String str = "2004-"

int stringLength = 0

for (int i = 1i <= 12i++)

{

// 绘制垂直方向虚线

g2d.drawLine(80+i * 40, 50, 80+i * 40, 360)

// 绘制横轴上月份的说明文字

str += i

stringLength = g2d.getFontMetrics().stringWidth(str)

if (i % 2 == 0)

{

g2d.drawString(str, 80+i * 40 - stringLength / 2, 387)

}

else

{

g2d.drawString(str, 80+i * 40 - stringLength / 2, 375)

}

str = "2004-"

}

str = ""

int stringHeight = 0

for (int i = 0i <300i += 30)

{

// 绘制水平方向虚线

g2d.drawLine(120, 60+i, 570, 60+i)

// 绘制纵轴上销售量的说明文字

str += 100-i / 3

stringHeight = g2d.getFontMetrics().getAscent()

stringLength = g2d.getFontMetrics().stringWidth(str)

g2d.drawString(str, 110-stringLength, 60+i + stringHeight / 2)

str = ""

}

// 绘制坐标轴

g2d.setStroke(new BasicStroke(3.0f))

g2d.setColor(new Color(53, 76, 112))

g2d.drawLine(120, 50, 120, 360)

g2d.drawLine(120, 360, 570, 360)

// 绘制纵坐标上的标题

g2d.setFont(new Font("黑体", Font.PLAIN, 15))

g2d.drawString("月销售量", 40, 45)

// 调用TriangleServlet类，绘制坐标轴上的箭头

TriangleServlet ts = new TriangleServlet()

ts.setFillColor(new Color(53, 76, 112))

ts.setBaseLine(10)

ts.setAlpha(60)

ts.drawTrigangle(570, 360, 2, 2, g2d)// 绘制横坐标轴上的箭头

ts.drawTrigangle(120, 50, 1, 2, g2d)// 绘制纵坐标轴上的箭头

String[] bookTitle = { "JAVA", "C#" }

Color[] bookColor = { Color.RED, Color.ORANGE }

int[] sales = new int[12]

int[] month = new int[12]

g2d.setFont(new Font("Courier New", Font.PLAIN, 12))

for (int i = 0i <bookTitle.lengthi++)

{

// 初始化绘制数据

int bookSales = 0

for (int j = 0j <sales.lengthj++)

{

bookSales = 45+(int)(Math.random() * 50)

sales[j] = 360-bookSales * 3

month[j] = 120+j * 40

}

// 重新设置笔划

g2d.setStroke(new BasicStroke(5.0f))

g2d.setColor(bookColor[i])

// 绘制月销售量折线

g2d.drawPolyline(month, sales, sales.length)

// 绘制图例

g2d.fillRect(30, 140+i * 20, 10, 10)

g2d.setColor(Color.BLACK)

g2d.drawString(bookTitle[i], 45, 150+i * 20)

}

// 部署图形

g2d.dispose()

// 利用ImageIO类的write方法对图像进行编码

ServletOutputStream sos = response.getOutputStream()

ImageIO.write(image, "PNG", sos)

sos.close()

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