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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 | import java.awt.Color; import java.awt.Font; import java.awt.Graphics; import java.awt.image.BufferedImage; import java.io.IOException; import java.util.Random; import javax.imageio.ImageIO; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; /** * 生成图形验证码的Servlet */ public class ImageCodeMakerServlet extends HttpServlet { public void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { doPost(req, resp); } /** * @see javax.servlet.http.HttpServlet#void * (javax.servlet.http.HttpServletRequest, * javax.servlet.http.HttpServletResponse) */ public void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { // 首先设置页面不缓存 resp.setHeader( "Pragma" , "No-cache" ); resp.setHeader( "Cache-Control" , "no-cache" ); resp.setDateHeader( "Expires" , 0 ); // 定义图片的宽度和高度 int width = 90 , height = 40 ; // 创建一个图像对象 BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); // 得到图像的环境对象 Graphics g = image.createGraphics(); Random random = new Random(); // 用随机颜色填充图像背景 g.setColor(getRandColor( 180 , 250 )); g.fillRect( 0 , 0 , width, height); for ( int i = 0 ; i < 5 ; i++) { g.setColor(getRandColor( 50 , 100 )); int x = random.nextInt(width); int y = random.nextInt(height); g.drawOval(x, y, 4 , 4 ); } // 设置字体,下面准备画随机数 g.setFont( new Font( "" , Font.PLAIN, 40 )); // 随机数字符串 String sRand = "" ; for ( int i = 0 ; i < 4 ; i++) { // 生成四个数字字符 String rand = String.valueOf(random.nextInt( 10 )); sRand += rand; // 生成随机颜色 g.setColor( new Color( 20 + random.nextInt( 80 ), 20 + random .nextInt( 100 ), 20 + random.nextInt( 90 ))); // 将随机数字画在图像上 g.drawString(rand, ( 17 + random.nextInt( 3 )) * i + 8 , 34 ); // 生成干扰线 for ( int k = 0 ; k < 12 ; k++) { int x = random.nextInt(width); int y = random.nextInt(height); int xl = random.nextInt( 9 ); int yl = random.nextInt( 9 ); g.drawLine(x, y, x + xl, y + yl); } } // 将生成的随机数字字符串写入Session req.getSession().setAttribute( "randcode" , sRand); // 使图像生效 g.dispose(); // 输出图像到页面 ImageIO.write(image, "JPEG" , resp.getOutputStream()); } /** * 产生一个随机的颜色 * * @param fc * 颜色分量最小值 * @param bc * 颜色分量最大值 * @return */ public Color getRandColor( int fc, int bc) { Random random = new Random(); if (fc > 255 ) { fc = 255 ; } if (bc > 255 ) { bc = 255 ; } int r = fc + random.nextInt(bc - fc); int g = fc + random.nextInt(bc - fc); int b = fc + random.nextInt(bc - fc); return new Color(r, g, b); } } |