好用的java图形验证码

工具类validateCode

package com.jd.jr.faecms.common.validateCode; import javax.imageio.ImageIO; import java.awt.*; import java.awt.image.BufferedImage; import java.io.FileOutputStream; import java.io.IOException; import java.io.OutputStream; import java.util.Date; import java.util.Random; /** * 验证码生成器 * * @author */ public class ValidateCode { // 图片的宽度。 private int width = 160; // 图片的高度。 private int height = 40; // 验证码字符个数 private int codeCount = 5; // 验证码干扰线数 private int lineCount = 150; // 验证码 private String code = null; // 验证码图片Buffer private BufferedImage buffImg = null; // 验证码范围,去掉0(数字)和O(拼音)容易混淆的(小写的1和L也可以去掉,大写不用了) private char[] codeSequence = {'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', '1', '2', '3', '4', '5', '6', '7', '8', '9'}; /** * 默认构造函数,设置默认参数 */ public ValidateCode() { this.createCode(); } /** * @param width 图片宽 * @param height 图片高 */ public ValidateCode(int width, int height) { this.width = width; this.height = height; this.createCode(); } /** * @param width 图片宽 * @param height 图片高 * @param codeCount 字符个数 * @param lineCount 干扰线条数 */ public ValidateCode(int width, int height, int codeCount, int lineCount) { this.width = width; this.height = height; this.codeCount = codeCount; this.lineCount = lineCount; this.createCode(); } public void createCode() { int x = 0, fontHeight = 0, codeY = 0; int red = 0, green = 0, blue = 0; x = width / (codeCount + 2);//每个字符的宽度(左右各空出一个字符) fontHeight = height - 2;//字体的高度 codeY = height - 4; // 图像buffer buffImg = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); Graphics2D g = buffImg.createGraphics(); // 生成随机数 Random random = new Random(); // 将图像填充为白色 g.setColor(Color.WHITE); g.fillRect(0, 0, width, height); // 创建字体,可以修改为其它的 Font font = new Font("Fixedsys", Font.PLAIN, fontHeight); // Font font = new Font("Times New Roman", Font.ROMAN_BASELINE, fontHeight); g.setFont(font); for (int i = 0; i < lineCount; i++) { // 设置随机开始和结束坐标 int xs = random.nextInt(width);//x坐标开始 int ys = random.nextInt(height);//y坐标开始 int xe = xs + random.nextInt(width / 8);//x坐标结束 int ye = ys + random.nextInt(height / 8);//y坐标结束 // 产生随机的颜色值，让输出的每个干扰线的颜色值都将不同。 red = random.nextInt(255); green = random.nextInt(255); blue = random.nextInt(255); g.setColor(new Color(red, green, blue)); g.drawLine(xs, ys, xe, ye); } // randomCode记录随机产生的验证码 StringBuffer randomCode = new StringBuffer(); // 随机产生codeCount个字符的验证码。 for (int i = 0; i < codeCount; i++) { String strRand = String.valueOf(codeSequence[random.nextInt(codeSequence.length)]); // 产生随机的颜色值，让输出的每个字符的颜色值都将不同。 red = random.nextInt(255); green = random.nextInt(255); blue = random.nextInt(255); g.setColor(new Color(red, green, blue)); g.drawString(strRand, (i + 1) * x, codeY); // 将产生的四个随机数组合在一起。 randomCode.append(strRand); } // 将四位数字的验证码保存到Session中。 code = randomCode.toString(); } public void write(String path) throws IOException { OutputStream sos = new FileOutputStream(path); this.write(sos); } public void write(OutputStream sos) throws IOException { ImageIO.write(buffImg, "png", sos); sos.close(); } public BufferedImage getBuffImg() { return buffImg; } public String getCode() { return code; } /** * 测试函数,默认生成到d盘 * @param args */ public static void main(String[] args) { ValidateCode vCode = new ValidateCode(160,40,5,150); try { String path="D:/"+new Date().getTime()+".png"; System.out.println(vCode.getCode()+" >"+path); vCode.write(path); } catch (IOException e) { e.printStackTrace(); } } }

頁面調用

<div class="form-group col-lg-6"> <label for="id" class="col-sm-4 control-label"> 验证码: </label> <div class="col-sm-8"> <input type="text" id="code" name="code" class="form-control" style="width:250px;"/> <img id="imgObj" alt="验证码" src="/article/validateCode" onclick="changeImg()"/> <a href="#" onclick="changeImg()">换一张</a> </div> </div> <script type="text/javascript"> // 刷新图片 function changeImg() { var imgSrc = $("#imgObj"); var src = imgSrc.attr("src"); imgSrc.attr("src", changeUrl(src)); } //为了使每次生成图片不一致，即不让浏览器读缓存，所以需要加上时间戳 function changeUrl(url) { var timestamp = (new Date()).valueOf(); var index = url.indexOf("?",url); if (index > 0) { url = url.substring(index, url.indexOf(url, "?")); } if ((url.indexOf("&") >= 0)) { url = url + "×tamp=" + timestamp; } else { url = url + "?timestamp=" + timestamp; } return url; } </script>

controller层输出验证

/** * 响应验证码页面 * @return */ @RequestMapping(value="/validateCode") public String validateCode(HttpServletRequest request,HttpServletResponse response) throws Exception{ // 设置响应的类型格式为图片格式 response.setContentType("image/jpeg"); //禁止图像缓存。 response.setHeader("Pragma", "no-cache"); response.setHeader("Cache-Control", "no-cache"); response.setDateHeader("Expires", 0); HttpSession session = request.getSession(); ValidateCode vCode = new ValidateCode(120,40,5,100); session.setAttribute("code", vCode.getCode()); vCode.write(response.getOutputStream()); return null; }

下面是controller层验证验证码输入是否正确

String code = request.getParameter("code"); HttpSession session = request.getSession(); String sessionCode = (String) session.getAttribute("code"); if (!StringUtils.equalsIgnoreCase(code, sessionCode)) { //忽略验证码大小写 throw new RuntimeException("验证码对应不上code=" + code + " sessionCode=" + sessionCode); }