Jfinal框架登陸頁面的圖形驗證碼
阿新 • • 發佈:2017-10-12
ima 獲得 希望 刷新 body 是否 異步刷新 tor console
本文轉自,http://www.bubuko.com/infodetail-720511.html
驗證碼的工具類, 這個jfinal自帶的也有,但是下面這個和Jfinal自帶的有一點點小的改動,(我用Jfinal自帶的,在action中判斷輸入的驗證碼和系統隨機生成的做對比的時候,出了問題。自帶的類好像要用到MD5加密手動輸入的驗證碼後才能判斷,(這個我也不太清楚,只是我的感覺 -,- !,真希望能有位好心人為我這樣的菜鳥解答一下。))。嗚,這個類也是在網上找的文章產考改的。。
package com.springscapital.console.ext.render; import java.awt.Color; import java.awt.Font; import java.awt.Graphics; import java.awt.image.BufferedImage; import java.io.IOException; import java.security.MessageDigest; import java.util.Random; import javax.imageio.ImageIO; import javax.servlet.ServletOutputStream; import javax.servlet.http.Cookie; import com.jfinal.core.Controller; import com.jfinal.kit.StringKit; import com.jfinal.render.Render; /** * * @author Administrator * 圖形驗證類 */ public class MyCaptchaRender extends Render { private static final long serialVersionUID = -7599510915228560611L; private static final String[] strArr = {"3", "4", "5", "6", "7", "8", "9", "A", "B", "C", "D", "E", "F", "G", "H", "J", "K", "M", "N", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y"}; private static String randomCodeKey = "JFINAL_JLHHWH_Key"; private static boolean caseInsensitive = true; private int img_width = 85; private int img_height = 20; private int img_randNumber = 6; public MyCaptchaRender() { } public MyCaptchaRender(String randomKey) { if (StringKit.isBlank(randomKey)) throw new IllegalArgumentException("randomKey can not be blank"); randomCodeKey = randomKey; } public MyCaptchaRender(int width, int height, int count, boolean isCaseInsensitive) { if(width <=0 || height <=0 || count <=0) { throw new IllegalArgumentException("Image width or height or count must be > 0"); } this.img_width = width; this.img_height = height; this.img_randNumber = count; caseInsensitive = isCaseInsensitive; } public MyCaptchaRender(String randomKey,int width, int height, int count, boolean isCaseInsensitive) { if (StringKit.isBlank(randomKey)) throw new IllegalArgumentException("randomKey can not be blank"); randomCodeKey = randomKey; if(width <=0 || height <=0 || count <=0) { throw new IllegalArgumentException("Image width or height or count must be > 0"); } this.img_width = width; this.img_height = height; this.img_randNumber = count; caseInsensitive = isCaseInsensitive; } public void render() { BufferedImage image = new BufferedImage(img_width, img_height, BufferedImage.TYPE_INT_RGB); String vCode = drawGraphic(image); vCode = encrypt(vCode); Cookie cookie = new Cookie(randomCodeKey, vCode); cookie.setMaxAge(-1); cookie.setPath("/"); response.addCookie(cookie); response.setHeader("Pragma","no-cache"); response.setHeader("Cache-Control","no-cache"); response.setDateHeader("Expires", 0); response.setContentType("image/jpeg"); ServletOutputStream sos = null; try { sos = response.getOutputStream(); ImageIO.write(image, "jpeg",sos); } catch (Exception e) { throw new RuntimeException(e); } finally { if (sos != null) try {sos.close();} catch (IOException e) {e.printStackTrace();} } } private String drawGraphic(BufferedImage image){ // 獲取圖形上下文 Graphics g = image.createGraphics(); // 生成隨機類 Random random = new Random(); // 設定背景色 g.setColor(getRandColor(200, 250)); g.fillRect(0, 0, img_width, img_height); // 設定字體 g.setFont(new Font("Times New Roman", Font.PLAIN, 18)); // 隨機產生155條幹擾線,使圖象中的認證碼不易被其它程序探測到 g.setColor(getRandColor(160, 200)); for (int i = 0; i < 155; i++) { int x = random.nextInt(img_width); int y = random.nextInt(img_height); int xl = random.nextInt(12); int yl = random.nextInt(12); g.drawLine(x, y, x + xl, y + yl); } // 取隨機產生的認證碼(img_randNumber位數字) String sRand = ""; for (int i = 0; i < img_randNumber; i++) { String rand = String.valueOf(strArr[random.nextInt(strArr.length)]); sRand += rand; // 將認證碼顯示到圖象中 g.setColor(new Color(20 + random.nextInt(110), 20 + random.nextInt(110), 20 + random.nextInt(110))); // 調用函數出來的顏色相同,可能是因為種子太接近,所以只能直接生成 g.drawString(rand, 13 * i + 6, 16); } // 圖象生效 g.dispose(); return sRand; } /* * 給定範圍獲得隨機顏色 */ private Color getRandColor(int fc, int bc) { Random random = new Random(); 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 final String encrypt(String srcStr) { try { String result = ""; MessageDigest md = MessageDigest.getInstance("MD5"); byte[] bytes = md.digest(srcStr.getBytes("utf-8")); for(byte b:bytes){ String hex = Integer.toHexString(b&0xFF).toUpperCase(); result += ((hex.length() ==1 ) ? "0" : "") + hex; } return result; } catch (Exception e) { throw new RuntimeException(e); } } public static boolean validate(Controller controller, String inputRandomCode) { if (StringKit.isBlank(inputRandomCode)) return false; try { if(caseInsensitive) inputRandomCode = inputRandomCode.toUpperCase(); inputRandomCode = encrypt(inputRandomCode); return inputRandomCode.equals(controller.getCookie(randomCodeKey)); } catch (Exception e) { e.printStackTrace(); return false; } } }
Action 中的代碼 :
package com.springscapital.console.site.controller; import com.jfinal.core.Controller; import com.springscapital.console.ext.render.MyCaptchaRender; public class HomeController extends Controller{ public void index() { render("/site/login.html"); } //驗證輸入的和系統生成的驗證碼是否一樣 public void login() { String inputRandomCode = getPara("captcha"); boolean validate = MyCaptchaRender.validate(this, inputRandomCode); System.out.println("CaptchaRender.validate=" + validate + ";inputRandomCode=" + inputRandomCode); } //生成圖片 public void captcha(){ render(new MyCaptchaRender(60,22,4,true)); } }
接下來就是頁面中的代碼了, 這個我也好糾結,本來想加個看不清換一張的按鈕然後用ajax異步刷新驗證碼的,可惜沒實現,頁面中被我註釋掉的代碼就是我用的ajax,但是沒搞出來,又有點小郁悶了,希望哪位大神看到了能為小弟解惑。
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Insert title here</title> <!-- <script type="text/javascript" src="${ctx!}/static/js/jquery-1.8.3.js"></script> <script type="text/javascript"> $(function() { $(".sumbit").click( function() { $.ajax( { url : "${ctx!}/site/captcha",//發送請求的地址 data : { account : $("#captcha").val()//發送到服務器的數據 }, error : function() { alert("error: 網絡異常請稍後再嘗試!!!");//請求失敗時彈出的信息 } success : function(data) {//返回的信息展示出來 $(".hint").html(data);//請求成功時,調用的函數 } }); }); }); </script> --> </head> <body> <div class="main" align="center"> <form action="${ctx!}/site/login" method="post"> <table> <tr> <td>用戶名:</td> <td><input type="text" name="username"/></td> </tr> <tr> <td>密 碼:</td> <td><input type="password" name="pwd"/></td> </tr> <tr> <td><img src="${ctx!}/site/captcha"> </td> <td> <input type="text"id="captcha" name="captcha" value=""/> <!-- <input class="sumbit" type="button" value="看不清換一張"> <input type=button value=刷新 onclick="location.reload()"> --> </td> </tr> <tr> <td> </td> <td> <INPUT TYPE="reset" name = "reset" value = "重 置"> <input type="submit" value="登陸"/> </td> </tr> </table> </form> </div> </body> </html>
Jfinal框架登陸頁面的圖形驗證碼