基于ＷＥＢ的自助订票系统

package com.dao; import java.awt.*; import java.awt.image.*; import java.io.*; import javax.imageio.*; import javax.servlet.*; import javax.servlet.http.*; public class DrawPicture { private String pictureTitle = "无标题"; //图片标题 private int pictureWidth = 460; //图片宽度 private int pictureHeight = 320; //图片高度 private String[] xTitle = {"x1", "x2", "x3", "x4", "x5", "x6"}; //x轴标题 private String[] yTitle = {"y1", "y2", "y3", "y4", "y5", "y6"}; //y轴标题 private String valueOrPercent = "percent"; private double[] data; //绘图数据 public DrawPicture() { } public void draw(HttpServletResponse response) { double percent = pictureWidth / 460.0; //绘图百分比 // 清空缓冲区 response.reset(); // 参数image的意思是设置返回客户端的响应数据类型为图象，参数pictureType为图片格式 response.setContentType("image/png"); // 创建一个指定大小的图像 BufferedImage image = new BufferedImage(pictureWidth, pictureHeight,BufferedImage.TYPE_INT_RGB); // 创建Java2D对象，Java2D即对二维图表的支持 Graphics2D g2d = image.createGraphics(); //绘制图片背景 g2d.setPaint(Color.WHITE); //设置颜色 g2d.fillRect(0, 0, pictureWidth, pictureHeight); //参数含义（x,y,width,height） //绘制图框 g2d.setPaint(Color.ORANGE); int roundSize = (int) (40 * percent); g2d.fillRoundRect(0, 0, pictureWidth, pictureHeight, roundSize, roundSize); //绘制绘图区 g2d.setPaint(Color.WHITE); int a = (int) (30 * percent); int b = (int) (50 * percent); g2d.fillRect(a, b, pictureWidth - a * 2, pictureHeight - (a + b)); //绘制坐标轴 g2d.setPaint(Color.BLACK); g2d.drawLine(a + (int) (40 * percent), pictureHeight - a * 2, pictureWidth - (a + 10), pictureHeight - a * 2); //x g2d.drawLine(a + (int) (40 * percent), b + 10, a + (int) (40 * percent), pictureHeight - a * 2); //y // //绘制坐标原点 // g2d.setColor(Color.BLACK); // g2d.setFont(new Font("华文隶书", Font.BOLD, 10)); //设置字体及大小 // g2d.drawString("0", a + (int) (40 * percent) - (int) (20 * percent), // pictureHeight - a * 2 + (int) (16 * percent)); //设置输出内容及输出位置 // 创建虚线笔划，设置线条颜色 float[] dashes = {3.f}; BasicStroke bs = new BasicStroke(1.0f, BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND, 10, dashes, 0); g2d.setStroke(bs); g2d.setPaint(Color.BLACK); //绘制标准线 int y = pictureHeight - a * 2; //前面加的1是为了弥补取整时的误差用的 int ySpacing = 1 + ((pictureHeight - a * 2) - (a + (int) (40 * percent)) - (int) (10 * percent)) / yTitle.length; for (int i = 0; i < yTitle.length; i++) { y = y - ySpacing; g2d.drawLine(a + (int) (40 * percent), y, pictureWidth - (a + 10), y); } //绘制坐标轴文字 g2d.setColor(Color.BLACK); g2d.setFont(new Font("华文隶书", Font.BOLD, 10)); //x轴 int xTitleLengthAll = 0; for (int i = 0; i < xTitle.length; i++) { xTitleLengthAll = xTitleLengthAll + xTitle[i].length(); } int xSpacing = ((pictureWidth - (a + 10)) - (a + (int) (40 * percent)) - (int) (10 * percent) - (xTitleLengthAll * 11)) / (xTitle.length * 2); int x = a + (int) (40 * percent); for (int i = 0; i < xTitle.length; i++) { x = x + xSpacing; g2d.drawString(xTitle[i], x, pictureHeight - a * 2 + (int) (16 * percent)); x = x + xTitle[i].length() * 11 + xSpacing; } //y轴 y = pictureHeight - a * 2 + 5; int yTitleLengthMax = 0; for (int i = 0; i < yTitle.length; i++) { if (yTitle[i].length() > yTitleLengthMax) { yTitleLengthMax = yTitle[i].length(); } } for (int i = 0; i < yTitle.length; i++) { y = y - ySpacing; g2d.drawString(yTitle[i], a + (int) (40 * percent) - yTitleLengthMax * 6 - 2, //注意：如果Y轴标题包含汉字，则乘11，否则乘6 y); } //定义标题 g2d.setColor(Color.RED); g2d.setFont(new Font("宋体", Font.BOLD, 16)); //确定标题开始输出的位置，确保居中显示 int outputTitleInX = 0; int titleLength = pictureTitle.length(); if (titleLength % 2 == 0) { outputTitleInX = (pictureWidth - titleLength * 17) / 2; } else { outputTitleInX = (pictureWidth - titleLength * 17) / 2 + 2; } g2d.drawString(pictureTitle, outputTitleInX, (int) (36 * percent)); //绘制柱状图 //判断数据类型 int[] histogramHigh = new int[data.length]; if (valueOrPercent.equals("percent")) { //求百分比 double dataSum = 0; for (int i = 0; i < data.length; i++) { dataSum = dataSum + data[i]; } for (int i = 0; i < data.length; i++) { histogramHigh[i] = (int) (data[i] * ((pictureHeight - a * 2) - (a + (int) (40 * percent)) - (int) (10 * percent)) / dataSum); } } else { //求值 int yTitleMin = Integer.parseInt(yTitle[0]); int yUnit = Integer.parseInt(yTitle[1]) - yTitleMin; for (int i = 0; i < data.length; i++) { if (data[i] > yTitleMin) { histogramHigh[i] = (int) (data[i] - yTitleMin + yUnit) * ySpacing / yUnit; } else { histogramHigh[i] = (int) data[i] * ySpacing / yTitleMin; } } } //绘制柱状图 g2d.setPaint(Color.GREEN); int xMiddle = 0; int xAll = 0; for (int i = 0; i < histogramHigh.length; i++) { xMiddle = xAll + xSpacing + xTitle[i].length() * 11 / 2; xAll = xAll + xSpacing * 2 + xTitle[i].length() * 11; g2d.fillRect(a + (int) (40 * percent) + xMiddle - 6, pictureHeight - a * 2 - histogramHigh[i], 12, histogramHigh[i]); } // 部署图形 g2d.dispose(); // 利用ImageIO类的write方法对图像进行编码，生成png格式的图象 ServletOutputStream sos = null; try { sos = response.getOutputStream(); ImageIO.write(image, "PNG", sos); sos.close(); } catch (IOException ex) { } } public void setPictureTitle(String pictureTitle) { this.pictureTitle = pictureTitle; } public void setPictureWidth(int pictureWidth) { this.pictureWidth = pictureWidth; } public void setPictureHeight(int pictureHeight) { this.pictureHeight = pictureHeight; } public void setXTitle(String[] xTitle) { this.xTitle = xTitle; } public void setYTitle(String[] yTitle) { this.yTitle = yTitle; } public void setData(double[] data) { this.data = data; } public void setValueOrPercent(String valueOrPercent) { this.valueOrPercent = valueOrPercent; } }