1 package com.itheima.servlet; 2 3 import java.awt.Color; 4 import java.awt.Font; 5 import java.awt.Graphics; 6 import java.awt.Graphics2D; 7 import java.awt.image.BufferedImage; 8 import java.io.IOException; 9 import java.util.Random; 10 11 import javax.imageio.ImageIO; 12 import javax.servlet.ServletException; 13 import javax.servlet.http.HttpServlet; 14 import javax.servlet.http.HttpServletRequest; 15 import javax.servlet.http.HttpServletResponse; 16 import javax.servlet.http.HttpSession; 17 18 /** 19 * 生成验证码图片 20 * 21 * 22 */ 23 public class CheckImgServlet extends HttpServlet { 24 25 public void doGet(HttpServletRequest request, HttpServletResponse response) 26 throws ServletException, IOException { 27 28 29 30 31 32 // 禁止缓存 33 // response.setHeader("Cache-Control", "no-cache"); 34 // response.setHeader("Pragma", "no-cache"); 35 // response.setDateHeader("Expires", -1); 36 37 int width = 120; 38 int height = 30; 39 40 // 步骤一 绘制一张内存中图片 41 BufferedImage bufferedImage = new BufferedImage(width, height, 42 BufferedImage.TYPE_INT_RGB); 43 44 // 步骤二 图片绘制背景颜色 ---通过绘图对象 45 Graphics graphics = bufferedImage.getGraphics();// 得到画图对象 --- 画笔 46 // 绘制任何图形之前 都必须指定一个颜色 47 graphics.setColor(getRandColor(200, 250)); 48 graphics.fillRect(0, 0, width, height); 49 50 // 步骤三 绘制边框 51 graphics.setColor(Color.WHITE); 52 graphics.drawRect(0, 0, width - 1, height - 1); 53 54 // 步骤四 四个随机数字 55 Graphics2D graphics2d = (Graphics2D) graphics; 56 // 设置输出字体 57 graphics2d.setFont(new Font("宋体", Font.BOLD, 18)); 58 59 String words = 60 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890"; 61 //生成汉字的验证码 62 /* String words = "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";*/ 63 Random random = new Random();// 生成随机数 64 //StringBuffer sb = new StringBuffer(); 65 66 // 定义x坐标 67 int x = 10; 68 for (int i = 0; i < 4; i++) { 69 // 随机颜色 70 graphics2d.setColor(new Color(20 + random.nextInt(110), 20 + random 71 .nextInt(110), 20 + random.nextInt(110))); 72 // 旋转 -30 --- 30度 73 int jiaodu = random.nextInt(60) - 30; 74 // 换算弧度 75 double theta = jiaodu * Math.PI / 180; 76 77 // 生成一个随机数字 78 int index = random.nextInt(words.length()); // 生成随机数 0 到 length - 1 79 // 获得字母数字 80 char c = words.charAt(index); 81 82 // 将生成汉字 加入buffer 83 //sb.append(c); 84 85 // 将c 输出到图片 86 graphics2d.rotate(theta, x, 20); 87 graphics2d.drawString(String.valueOf(c), x, 20); 88 graphics2d.rotate(-theta, x, 20); 89 x += 30; 90 } 91 92 //request.getSession().setAttribute("code", sb.toString()); 93 // 步骤五 绘制干扰线 94 graphics.setColor(getRandColor(160, 200)); 95 int x1; 96 int x2; 97 int y1; 98 int y2; 99 for (int i = 0; i < 30; i++) { 100 x1 = random.nextInt(width); 101 x2 = random.nextInt(12); 102 y1 = random.nextInt(height); 103 y2 = random.nextInt(12); 104 graphics.drawLine(x1, y1, x1 + x2, x2 + y2); 105 } 106 107 // 将上面图片输出到浏览器 ImageIO 108 graphics.dispose();// 释放资源 109 ImageIO.write(bufferedImage, "jpg", response.getOutputStream()); 110 111 } 112 113 114 public void doPost(HttpServletRequest request, HttpServletResponse response) 115 throws ServletException, IOException { 116 doGet(request, response); 117 } 118 119 /** 120 * 取其某一范围的color 121 * 122 * @param fc 123 * int 范围参数1 124 * @param bc 125 * int 范围参数2 126 * @return Color 127 */ 128 private Color getRandColor(int fc, int bc) { 129 // 取其随机颜色 130 Random random = new Random(); 131 if (fc > 255) { 132 fc = 255; 133 } 134 if (bc > 255) { 135 bc = 255; 136 } 137 int r = fc + random.nextInt(bc - fc); 138 int g = fc + random.nextInt(bc - fc); 139 int b = fc + random.nextInt(bc - fc); 140 return new Color(r, g, b); 141 } 142 143 }