/**
* Copyright (c) 2011-2017, James Zhan 詹波 (jfinal@126.com).
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
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.util.Random;
import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.Cookie;
import com.jfinal.core.Controller;
import com.jfinal.kit.HashKit;
import com.jfinal.kit.LogKit;
import com.jfinal.kit.StrKit;
import com.jfinal.render.Render;
/**
* CaptchaRender.本验证码实现已被 Deprecated 不建使用.
* 建议使用新版本的 Controller.renderCaptcha() 既简单又美观,并且还提供了
* Controller.validateCaptcha(para)与 Validator.validateCaptcha(para)支持
*/
@Deprecated
public class CaptchaRender extends Render {
private static final int WIDTH = 80, HEIGHT = 26;
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 String captchaName;
public CaptchaRender(String captchaName) {
if (StrKit.isBlank(captchaName)) {
throw new IllegalArgumentException("captchaName can not be blank");
}
this.captchaName = captchaName;
}
public void render() {
BufferedImage image = new BufferedImage(WIDTH, HEIGHT, BufferedImage.TYPE_INT_RGB);
String vCode = drawGraphic(image);
vCode = vCode.toUpperCase();
vCode = HashKit.md5(vCode);
Cookie cookie = new Cookie(captchaName, vCode);
cookie.setMaxAge(-1);
cookie.setPath("/");
// cookie.setHttpOnly(true);
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) {LogKit.logNothing(e);}
}
}
}
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, WIDTH, 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(WIDTH);
int y = random.nextInt(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(4位数字)
String sRand = "";
for (int i = 0; i < 4; 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, 16 * i + 11, 19);
}
// 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);
}
public static boolean validate(Controller controller, String userInputCaptcha, String captchaName) {
if (StrKit.isBlank(userInputCaptcha)) {
return false;
}
userInputCaptcha = userInputCaptcha.toUpperCase();
userInputCaptcha = HashKit.md5(userInputCaptcha);
boolean result = userInputCaptcha.equals(controller.getCookie(captchaName));
if (result == true) {
controller.removeCookie(captchaName);
}
return result;
}
}