JFinal中使用CaptchaRender来实现图型验证码
2015-01-07 00:00
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摘要: JFinal中使用CaptchaRender来实现图型验证码
package com.jfinal.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; 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){ // 获取图形上下文 Graphics g = image.createGraphics(); // 生成随机类 Random random = new Random(); // 设定背景色 g.setColor(getRandColor(200, 250)); g.fillRect(0, 0, img_width, img_height); // 设定字体 g.setFont(new Font("Times New Roman", Font.PLAIN, 18)); // 随机产生155条干扰线,使图象中的认证码不易被其它程序探测到 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); } // 取随机产生的认证码(img_randNumber位数字) String sRand = ""; for (int i = 0; i < img_randNumber; i++) { String rand = String.valueOf(strArr[random.nextInt(strArr.length)]); sRand += rand; // 将认证码显示到图象中 g.setColor(new Color(20 + random.nextInt(110), 20 + random.nextInt(110), 20 + random.nextInt(110))); // 调用函数出来的颜色相同,可能是因为种子太接近,所以只能直接生成 g.drawString(rand, 13 * i + 6, 16); } // 图象生效 g.dispose(); return sRand; } /* * 给定范围获得随机颜色 */ 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; } } }
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