JAVA image verification code and java Verification Code

JAVA image verification code and java Verification Code

Package hh.com. util; import java. io. IOException; import javax. servlet. servletException; import javax. servlet. http. httpServletRequest; import javax. servlet. http. httpServletResponse; import javax. servlet. http. httpSession; public class AuthImage extends javax. servlet. http. httpServlet implements javax. servlet. servlet {static final long serialVersionUID = 1L; public void service (HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {response. setHeader ("Pragma", "No-cache"); response. setHeader ("Cache-Control", "no-cache"); response. setDateHeader ("Expires", 0); response. setContentType ("image/jpeg"); // generates the random String verifyCode = VerifyCodeUtils. generateVerifyCode (4); // Save the session sessionHttpSession session = request. getSession (true); session. setAttribute ("rand", verifyCode. toLowerCase (); // generate an image int w = 200, h = 80; VerifyCodeUtils. outputImage (w, h, response. getOutputStream (), verifyCode );}}

VerifyCodeUtils class

Package hh.com. util; import java. awt. color; import java. awt. font; import java. awt. graphics; import java. awt. graphics2D; import java. awt. linearGradientPaint; import java. awt. paint; 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; public class VerifyCodeUtils {// The Algerian font is used. If the font is not in the system, the font needs to be installed. Only uppercase letters are displayed, with, I removed, o several confusing characters: public static final String VERIFY_CODES = "23456789 ABCDEFGHJKLMNPQRSTUVWXYZ"; private static Random random = new Random (); /*** use the system default character source to generate a Verification Code * @ param verifySize the verification code length * @ return */public static String generateVerifyCode (int verifySize) {return generateVeri FyCode (verifySize, VERIFY_CODES );} /*** use the specified source to generate a Verification Code * @ param verifySize verification code length * @ param sources Verification Code character source * @ return */public static String generateVerifyCode (int verifySize, String sources) {if (sources = null | sources. length () = 0) {sources = VERIFY_CODES;} int codesLen = sources. length (); Random rand = new Random (System. currentTimeMillis (); StringBuilder verifyCode = new StringBuilder (verifySize); for (in T I = 0; I <verifySize; I ++) {verifyCode. append (sources. charAt (rand. nextInt (codesLen-1);} return verifyCode. toString ();}/*** generate a Random verification code file, return the verification code value * @ param w * @ param h * @ param outputFile * @ param verifySize * @ return * @ throws IOException */public static String outputVerifyImage (int w, int h, file outputFile, int verifySize) throws IOException {String verifyCode = generateVerifyCode (verifySize); out PutImage (w, h, outputFile, verifyCode); return verifyCode;}/*** outputs the Random verification code image stream, return the verification code value * @ param w * @ param h * @ param OS * @ param verifySize * @ return * @ throws IOException */public static String outputVerifyImage (int w, int h, outputStream OS, int verifySize) throws IOException {String verifyCode = generateVerifyCode (verifySize); outputImage (w, h, OS, verifyCode); return verifyCode ;} /*** generate the image file of the specified Verification Code * @ Param w * @ param h * @ param outputFile * @ param code * @ throws IOException */public static void outputImage (int w, int h, 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 (w, h, fos, code); fos. close () ;}catch (IOException e) {throw e ;}} /*** output the specified Verification code image stream * @ param w * @ param h * @ param OS * @ param code * @ throws IOException */public static void outputImage (int w, int h, OutputStream OS, String code) throws IOException {int verifySize = code. length (); BufferedImage image = new BufferedImage (w, h, BufferedImage. TYPE_INT_RGB); Random rand = new Random (); Graphics2D g2 = image. createGraphics (); g2.setRenderingHint (RenderingHints. KEY_ANTIALIASING, RenderingHints. VALUE_ANTIALIAS_ON); Color [] colors = new Color [5]; Color [] colorSpaces = new Color [] {Color. WHITE, Color. CYAN, Color. GRAY, Color. LIGHT_GRAY, Color. MAGENTA, Color. ORANGE, Color. PINK, Color. YELLO W}; 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); // set the border Color g2.fillRect (0, 0, w, h); Color c = getRandColor (200,250); g2.setColor (c); // set the background Color g2.fillRect (0, 2, w, H-4); // draw interference line Random random = new Random (); g2.setColor (getRandColor (160,200); // set the line color 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);} // Add the noise float yawpRate = 0.05f; // noise rate 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 = getRandomIntCo Lor (); image. setRGB (x, y, rgb);} shear (g2, w, h, c); // twist the image g2.setColor (getRandColor (100,160); int fontSize = H-4; font font = new Font ("Algerian", Font. ITALIC, fontSize); g2.setFont (font); char [] chars = code. toCharArray (); for (int I = 0; I <verifySize; I ++) {AffineTransform affine = new AffineTransform (); affine. setToRotation (Math. PI/4 * rand. nextDouble () * (rand. nextBoolean ()? 1:-1), (w/verifySize) * I + fontSize/2, h/2); g2.setTransform (affine); g2.drawChars (chars, I, 1, (w-10) /verifySize) * 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 = color <8; color = 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 
Web. xml configuration:
1     <servlet>2         <servlet-name>AuthImage</servlet-name>3         <servlet-class>hh.com.util.AuthImage</servlet-class>4       </servlet>5       <servlet-mapping>6         <servlet-name>AuthImage</servlet-name>7         <url-pattern>/authImage</url-pattern>8       </servlet-mapping>