验证码生成工具：VerifyCodeUtils，controller
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package com.a.b.utils;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.security.SecureRandom;import java.util.Arrays;import javax.imageio.ImageIO;import org.apache.log4j.Logger;public class VerifyCodeUtils {private static final Logger logger = Logger.getLogger(VerifyCodeUtils.class);private VerifyCodeUtils() {} public static final String VERIFY_CODES = "0123456789"; private static SecureRandom random = new SecureRandom(); /** * 使用系统默认字符源生成验证码 * @param verifySize 验证码长度 * @return */ public static String generateVerifyCode(int verifySize){ return generateVerifyCode(verifySize, VERIFY_CODES); } /** * 使用指定源生成验证码 * @param verifySize 验证码长度 * @param sources 验证码字符源 * @return */ public static String generateVerifyCode(int verifySize, String sources){ String _sources = sources; if(_sources == null || _sources.length() == 0){ _sources = VERIFY_CODES; } int codesLen = _sources.length(); SecureRandom rand = new SecureRandom(); StringBuilder verifyCode = new StringBuilder(verifySize); for(int i = 0; i < verifySize; i++){ verifyCode.append(_sources.charAt(rand.nextInt(codesLen-1))); } return verifyCode.toString(); } /** * 生成随机验证码文件,并返回验证码值 * @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; } /** * 输出随机验证码图片流,并返回验证码值 * @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; } /** * 生成指定验证码图像文件 * @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(); } FileOutputStream fos = null; try{ outputFile.createNewFile(); fos = new FileOutputStream(outputFile); outputImage(w, h, fos, code); } catch(IOException e){ logger.error("生成指定验证码图像文件", e); } finally { try { fos.close();} catch (IOException e) {logger.error("生成指定验证码图像文件", e);} } } /** * 输出指定验证码图片流 * @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); SecureRandom rand = new SecureRandom(); 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);// 设置边框色 g2.fillRect(0, 0, w, h); Color c = getRandColor(200, 250); g2.setColor(c);// 设置背景色 g2.fillRect(0, 2, w, h-4); //绘制干扰线 SecureRandom random = new SecureRandom(); g2.setColor(getRandColor(160, 200));// 设置线条的颜色 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); } // 添加噪点 float yawpRate = 0.05f;// 噪声率 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);// 使图片扭曲 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) { int _fc = fc; int _bc = 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); 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); 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; 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); g.setColor(color); g.drawLine(i, (int) d, i, 0); g.drawLine(i, (int) d + h1, i, h1); } }}controller：
/**
* @Title: genarateCode
* @Description: 生成【图形】验证码
* @author: wanglongfei
* @date: 2017年3月9日 下午3:31:40
* @param request
* @param response
* @throws IOException
* @return: void
*/
@RequestMapping(value = "/web/code", method = RequestMethod.GET)
public void genarateCode(HttpServletRequest request,HttpServletResponse response) throws IOException{
response.setHeader("Pragma", "No-cache");
response.setHeader("Cache-Control", "no-cache");
response.setDateHeader("Expires", 0);
response.setContentType("image/jpeg");
//生成随机字串
String verifyCode = VerifyCodeUtils.generateVerifyCode(4);
//存入会话session
HttpSession session = request.getSession(true);
//删除以前的
session.removeAttribute("verCode");
session.setAttribute("verCode", verifyCode.toLowerCase());
//生成图片
int w = 100, h = 30;
VerifyCodeUtils.outputImage(w, h, response.getOutputStream(), verifyCode);
}
页面：<script type="text/javascript" src="${StaticPath}js/jquery-3.1.1.min.js"></script><script src="${StaticPath}js/jquery.min.js" type="text/javascript"></script><script type="text/javascript">$(function() {changeImg();}); function changeImg(){ var img = document.getElementById("img"); img.src = "${RootPath}pfUserBase/web/code?date=" + new Date(); }$(function() {$("#myform").Validform({btnSubmit:".ok", btnReset:".cancel",ajaxPost:true,tiptype : function(message, o, cssctl) {var objtip = $("#message");cssctl(objtip, o.type);objtip.text("提示：" + message);},callback:function(data){alert(data.message);window.location.href = "${RootPath}"+data.data;}});});</script><form id="myform" action="${RootPath}pfUserBase/web/login" method="POST"> 用户名: <input type="text" name="loginName"/> <br/><br/> 密码: <input type="password" name="userpwd"/><br/><br/> 验证码： <input type="text" name="verCode" id="vercode"/><br/><br/> <img id="img" src="" /> <a href='javascript:void(0);' onclick="javascript:changeImg()" style="color:white;"><label style="color:blue;">看不清</label></a><br/><br/> <div class="button-box"> <a href="javascript:;" class="ok">提交</a> <a href="javascript:;" class="cancel">取消</a></div> <div id="message" style="color:red;"></div></form>
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