本節常用講java驗證碼的使用
使用ValidateCode.java的工具類進行驗證碼的生成
驗證碼生成源碼:
public class ValidateCode { // 圖片的寬度。 PRivate int width = 120; // 圖片的高度。 private int height = 40; // 驗證碼字符個數 private int codeCount = 4; // 驗證碼干擾線數 private int lineCount = 20; // 驗證碼 private String code = null; // 驗證碼圖片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 圖片寬 * @param height 圖片高 */ public ValidateCode(int width,int height) { this.width=width; this.height=height; this.createCode(); } /** * * @param width 圖片寬 * @param height 圖片高 * @param codeCount 字符個數 * @param lineCount 干擾線條數 */ 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);//每個字符的寬度 fontHeight = height - 2;//字體的高度 codeY = height - 4; // 圖像buffer buffImg = new BufferedImage(width, height,BufferedImage.TYPE_INT_RGB); Graphics2D g = buffImg.createGraphics(); // 生成隨機數 Random random = new Random(); // 將圖像填充為白色 g.setColor(Color.WHITE); g.fillRect(0, 0, width, height); // 創建字體 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記錄隨機產生的驗證碼 StringBuffer randomCode = new StringBuffer(); // 隨機產生codeCount個字符的驗證碼。 for (int i = 0; i < codeCount; i++) { String strRand = String.valueOf(codeSequence[random.nextInt(codeSequence.length)]); // 產生隨機的顏色值,讓輸出的每個字符的顏色值都將不同。 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); // 將產生的四個隨機數組合在一起。 randomCode.append(strRand); } // 將四位數字的驗證碼保存到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框架所以我們寫一個共用的controller類在其中寫個驗證碼獲取的接口好讓前端能夠獲取到驗證碼
接口:我通過ValidateCode類獲取驗證碼的字符串保存到session中去
/** * 方法描述:驗證碼 *@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()); }驗證接口:獲取已保存在session中的驗證碼字符串獲取出來與傳入的字符串進行比較 /** * 方法描述:驗證正確 *@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); } }驗證碼接口效果圖:

前端我用的jq validate進行表單驗證前端驗證源碼:
$("#form-article-add").validate({ //出錯時添加的標簽 errorElement : "span", rules: { name: { required: true, minlength: 4, maxlength: 12, }, passWord: { required: true, minlength: 6, maxlength: 16 }, code: { required: true, remote: { type: "post", url: "/wwwydl/s/comm/codev", data: {code:$("#code").val()}, dataType: "json", dataFilter: function(result, type) { var json = eval('(' + result + ')'); if(json.data){ return true; }else{ return false; changeCode(); } } } }, }, success: function(label) { //正確時的樣式 label.text(" ").addClass("success"); }, messages: { code: { required: "輸入驗證碼", remote: "驗證碼錯誤" } }, onkeyup:false, focusCleanup:true, success:"valid", submitHandler:function(form){ submit(); } });前端效果圖:

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