本节常用讲java验证码的使用
使用ValidateCode.java的工具类进行验证码的生成
验证码生成源码:
public class ValidateCode { // 图片的宽度。 PRivate int width = 120; // 图片的高度。 private int height = 40; // 验证码字符个数 private int codeCount = 4; // 验证码干扰线数 private int lineCount = 20; // 验证码 private String code = null; // 验证码图片Buffer private BufferedImage buffImg=null; private char[] codeSequence = { 'A', 'B', 'C', 'D', 'E', 'F', 'H', 'J', 'K', 'M', 'N', 'P', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', '2', '3', '4', '5', '6', '7', '8' }; 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 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 ImgFontByte imgFont=new ImgFontByte(); Font font =imgFont.getFont(fontHeight); g.setFont(font); for (int i = 0; i < lineCount; i++) { int xs = random.nextInt(width); int ys = random.nextInt(height); int xe = xs+random.nextInt(width/8); int ye = ys+random.nextInt(height/8); 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; }}我后端采用的ssm框架所以我们写一个共用的controller类在其中写个验证码获取的接口好让前端能够获取到验证码
接口:我通过ValidateCode类获取验证码的字符串保存到session中去
/** * 方法描述:验证码 *@return * @throws IOException */ @RequestMapping("/code") public void Code() throws IOException{ ValidateCode code=new ValidateCode(110, 40, 4, 5); request.getSession().setAttribute("code", code.getCode()); code.write(response.getOutputStream()); }验证接口:获取已保存在session中的验证码字符串获取出来与传入的字符串进行比较/** * 方法描述:验证正确 *@return * @throws IOException */ @RequestMapping("/codev") @ResponseBody public ResResult Codev(String code){ String c=(String) request.getSession().getAttribute("code"); if(c.equals(code.toUpperCase())){ return ResResult.ok(true); }else{ return ResResult.ok(false); } }验证码接口效果图:
前端我用的jq validate进行表单验证前端验证源码:
$("#form-article-add").validate({ //出错时添加的标签 errorElement : "span", rules: { name: { required: true, minlength: 4, maxlength: 12, }, passWord: { required: true, minlength: 6, maxlength: 16 }, code: { required: true, remote: { type: "post", url: "/wwwydl/s/comm/codev", data: {code:$("#code").val()}, dataType: "json", dataFilter: function(result, type) { var json = eval('(' + result + ')'); if(json.data){ return true; }else{ return false; changeCode(); } } } }, }, success: function(label) { //正确时的样式 label.text(" ").addClass("success"); }, messages: { code: { required: "输入验证码", remote: "验证码错误" } }, onkeyup:false, focusCleanup:true, success:"valid", submitHandler:function(form){ submit(); } });前端效果图:
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