验证码生成
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import java.awt.Color; import java.awt.Font; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.RenderingHints; import java.awt.geom.AffineTransform; import java.awt.image.BufferedImage; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.OutputStream; import java.util.Arrays; import java.util.Random; import javax.imageio.ImageIO; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse;
public class AuthCodeUtil { private static final String VERIFY_CODES = "23456789ABCDEFGHJKLMNPQRSTUVWXYZ"; private static final String SESSION_KEY_BM_CODE = "SESSION_KEY_BM_CODE"; private static Random random = new Random();
public static void createAuthCodeAndOutput(int wide, int high, int size, HttpServletRequest request, HttpServletResponse response) throws IOException { response.setHeader("Pragma", "no-cache"); response.setHeader("Cache-Control", "no-cache"); response.setDateHeader("Expires", 0L); response.setContentType("image/gif");
String authCode = createAuthCode(size);
SessionManager.setAttribute(request, "SESSION_KEY_BM_CODE", authCode);
OutputStream os = null; try { os = response.getOutputStream(); } catch (IOException e) { e.printStackTrace(); }
outputImage(wide, high, os, authCode); }
public static boolean checkAuthCode(String authCode, HttpServletRequest request, HttpServletResponse response) throws IOException { String sessionAuthCode = (String)SessionManager.getAttribute(request, "SESSION_KEY_BM_CODE");
return authCode.equalsIgnoreCase(sessionAuthCode); }
public static String createAuthCode(int authSize) { return createAuthCode(authSize, "23456789ABCDEFGHJKLMNPQRSTUVWXYZ"); }
public static String createAuthCode(int authSize, String sources) { if ((sources == null) || (sources.length() == 0)) { sources = "23456789ABCDEFGHJKLMNPQRSTUVWXYZ"; } int codesLen = sources.length(); Random rand = new Random(System.currentTimeMillis()); StringBuilder authCode = new StringBuilder(authSize); for (int i = 0; i < authSize; ++i) { authCode.append(sources.charAt(rand.nextInt(codesLen - 1))); } return authCode.toString(); }
public static void outputImage(int wide, int high, File outputFile, String code) throws IOException { if (outputFile == null) { return; } File dir = outputFile.getParentFile(); if (!dir.exists()) dir.mkdirs(); try { outputFile.createNewFile(); FileOutputStream fos = new FileOutputStream(outputFile); outputImage(wide, high, fos, code); fos.close(); } catch (IOException e) { throw e; } }
public static void outputImage(int wide, int high, OutputStream os, String code) throws IOException { int w = wide; int h = high; int authSize = code.length(); BufferedImage image = new BufferedImage(w, h, 1); Random rand = new Random(); Graphics2D g2 = image.createGraphics(); g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); Color[] colors = new Color[5]; Color[] colorSpaces = { Color.WHITE, Color.CYAN, Color.GRAY, Color.LIGHT_GRAY, Color.MAGENTA, Color.ORANGE, Color.PINK, Color.YELLOW };
float[] fractions = new float[colors.length]; for (int i = 0; i < colors.length; ++i) { colors[i] = colorSpaces[rand.nextInt(colorSpaces.length)]; fractions[i] = rand.nextFloat(); } Arrays.sort(fractions); g2.setColor(Color.GRAY); g2.fillRect(0, 0, w, h); Color c = getRandColor(200, 250); g2.setColor(c); g2.fillRect(0, 2, w, h - 4);
Random random = new Random(); g2.setColor(getRandColor(160, 200)); for (int i = 0; i < 20; ++i) { int x = random.nextInt(w - 1); int y = random.nextInt(h - 1); int xl = random.nextInt(6) + 1; int yl = random.nextInt(12) + 1; g2.drawLine(x, y, x + xl + 40, y + yl + 20); }
float yawpRate = 0.05F; int area = (int)(yawpRate * w * h); for (int i = 0; i < area; ++i) { int x = random.nextInt(w); int y = random.nextInt(h); int rgb = getRandomIntColor(); image.setRGB(x, y, rgb); }
shear(g2, w, h, c);
g2.setColor(getRandColor(100, 160)); int fontSize = h - 4; Font font = new Font("Fixedsys", 1, fontSize); g2.setFont(font); char[] chars = code.toCharArray(); for (int i = 0; i < authSize; ++i) { AffineTransform affine = new AffineTransform(); affine.setToRotation(0.7853981633974483D * rand.nextDouble() * ((rand.nextBoolean()) ? 1 : -1), w / authSize * i + fontSize / 2, h / 2); g2.setTransform(affine); g2.drawChars(chars, i, 1, (w - 10) / authSize * i + 5, h / 2 + fontSize / 2 - 10); }
g2.dispose(); ImageIO.write(image, "jpg", os); }
private static Color getRandColor(int fc, int bc) { 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); }
private static int getRandomIntColor() { int[] rgb = getRandomRgb(); int color = 0; for (int c : rgb) { color <<= 8; color |= c; } return color; }
private static int[] getRandomRgb() { int[] rgb = new int[3]; for (int i = 0; i < 3; ++i) { rgb[i] = random.nextInt(255); } return rgb; }
private static void shear(Graphics g, int w1, int h1, Color color) { shearX(g, w1, h1, color); shearY(g, w1, h1, color); }
private static void shearX(Graphics g, int w1, int h1, Color color) { int period = random.nextInt(2);
boolean borderGap = true; int frames = 1; int phase = random.nextInt(2);
for (int i = 0; i < h1; ++i) { double d = (period >> 1) * Math.sin(i / period + 6.283185307179586D * phase / frames); g.copyArea(0, i, w1, 1, (int)d, 0); if (borderGap) { g.setColor(color); g.drawLine((int)d, i, 0, i); g.drawLine((int)d + w1, i, w1, i); } } }
private static void shearY(Graphics g, int w1, int h1, Color color) { int period = random.nextInt(40) + 10;
boolean borderGap = true; int frames = 20; int phase = 7; for (int i = 0; i < w1; ++i) { double d = (period >> 1) * Math.sin(i / period + 6.283185307179586D * phase / frames); g.copyArea(i, 0, 1, h1, 0, (int)d); if (borderGap) { g.setColor(color); g.drawLine(i, (int)d, i, 0); g.drawLine(i, (int)d + h1, i, h1); } } }
public static void main(String[] args) throws IOException { File dir = new File("D:/verifies"); int w = 300; int h = 80; for (int i = 0; i < 50; ++i) { String authCode = createAuthCode(4); File file = new File(dir, new StringBuilder().append(authCode).append(".jpg").toString()); outputImage(w, h, file, authCode); } } } |
