本文為大家分享了Java版仿QQ驗證碼風格圖片驗證碼，具體內容如下
功能包括：自定義圖片尺寸和字符長度，隨機背景顏色和字符顏色，隨機字符偏移角度，字符平滑邊緣，干擾線，噪點，背景扭曲。
本來想做字符扭曲的，不知道怎的先生成文字再扭曲就報錯了，先就這樣吧，希望有高手能幫助修正一下。
需要說明的是之所以有幾分像QQ的驗證碼感覺是因為這個Algerian字體，如果系統沒有的話需要自行安裝，百度搜字體名能下載到，丟系統Fonts文件夾就行。
效果圖：
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"); //生成隨機字串String verifyCode = VerifyCodeUtils.generateVerifyCode(4); //存入會話session HttpSession session = request.getSession(true); session.setAttribute("rand", verifyCode.toLowerCase()); //生成圖片int w = 200, h = 80; VerifyCodeUtils.outputImage(w, h, response.getOutputStream(), verifyCode); }} VerifyCodeUtils類
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{ //使用到Algerian字體，系統裡沒有的話需要安裝字體，字體只顯示大寫，去掉了1,0,i,o幾個容易混淆的字符public static final String VERIFY_CODES = "23456789ABCDEFGHJKLMNPQRSTUVWXYZ"; private static Random random = new Random(); /** * 使用系統默認字符源生成驗證碼* @param verifySize 驗證碼長度* @return */ public static String generateVerifyCode(int verifySize){ return generateVerifyCode(verifySize, VERIFY_CODES); } /** * 使用指定源生成驗證碼* @param verifySize 驗證碼長度* @param sources 驗證碼字符源* @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(int i = 0; i < verifySize; i++){ verifyCode.append(sources.charAt(rand.nextInt(codesLen-1))); } return verifyCode.toString(); } /** * 生成隨機驗證碼文件,並返回驗證碼值* @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); outputImage(w, h, outputFile, verifyCode); return verifyCode; } /** * 輸出隨機驗證碼圖片流,並返回驗證碼值* @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; } /** * 生成指定驗證碼圖像文件* @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; } } /** * 輸出指定驗證碼圖片流* @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.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);// 設置邊框色g2.fillRect(0, 0, w, h); Color c = getRandColor(200, 250); g2.setColor(c);// 設置背景色g2.fillRect(0, 2, w, h-4); //繪製干擾線Random random = new Random(); g2.setColor(getRandColor(160, 200));// 設置線條的顏色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); } // 添加噪點float yawpRate = 0.05f;// 噪聲率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);// 使圖片扭曲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 < h1; i++) { double d = (double) (period >> 1) * Math.sin((double) i / (double) period + (6.2831853071795862D * (double) phase) / (double) 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; // 50; boolean borderGap = true; int frames = 20; int phase = 7; for (int i = 0; i < w1; i++) { double d = (double) (period >> 1) * Math.sin((double) i / (double) period + (6.2831853071795862D * (double) phase) / (double) 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("F:/verifies"); int w = 200, h = 80; for(int i = 0; i < 50; i++){ String verifyCode = generateVerifyCode(4); File file = new File(dir, verifyCode + ".jpg"); outputImage(w, h, file, verifyCode); } }} web.xml配置:
<servlet> <servlet-name>AuthImage</servlet-name> <servlet-class>hh.com.util.AuthImage</servlet-class> </servlet> <servlet-mapping> <servlet-name>AuthImage</servlet-name> <url-pattern>/authImage</url-pattern> </servlet-mapping>
以上就是本文的全部內容，希望能夠對大家學習java圖片驗證碼有所啟發。