最近做验证码,参考网上案例,发现有不少问题,特意进行了修改和完善。
验证码生成器:
- 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();
- }
- }
- }
下面是页面JS调用验证码
- // 刷新图片
- function changeImg() {
- var imgSrc = $("#imgObj");
- var url = imgSrc.attr("src");
- imgSrc.attr("src", changeUrl(url));
- }
- //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("?");
- console.log(index);
- if (index > 0) {
- url = url.substring(0, url.indexOf("?"));
- }
- console.log(url);
- if ((url.indexOf("&") > 0)) {
- url = url + "×tamp=" + timestamp;
- console.log(url);
- } else {
- url = url + "?timestamp=" + timestamp;
- console.log(url);
- }
- return url;
- }
下面是controller层输出验证码
- /**
- * 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);
- }