jfinal adds jcaptcha verification code implementation method

复制代码代码如下:

package com.g.core.common.JCaptcha;

import java.awt.Color;

import java.awt.Font;

import com.octo.captcha.component.image.backgroundgenerator.BackgroundGenerator;

import com.octo.captcha.component.image.backgroundgenerator.FileReaderRandomBackgroundGenerator;

import com.octo.captcha.component.image.color.RandomListColorGenerator;

import com.octo.captcha.component.image.fontgenerator.FontGenerator;

import com.octo.captcha.component.image.fontgenerator.RandomFontGenerator;

import com.octo.captcha.component.image.textpaster.DecoratedRandomTextPaster;

import com.octo.captcha.component.image.textpaster.TextPaster;

import com.octo.captcha.component.image.textpaster.textdecorator.TextDecorator;

import com.octo.captcha.component.image.wordtoimage.ComposedWordToImage;

import com.octo.captcha.component.image.wordtoimage.WordToImage;

import com.octo.captcha.component.word.wordgenerator.RandomWordGenerator;

import com.octo.captcha.component.word.wordgenerator.WordGenerator;

import com.octo.captcha.engine.image.ListImageCaptchaEngine;

import com.octo.captcha.image.gimpy.GimpyFactory;

/**

* 生成验证码图片

*/

public class JCaptchaEngine extends ListImageCaptchaEngine {

public static final String IMAGE_CAPTCHA_KEY = "imageCaptcha";// ImageCaptcha对象存放在Session中的key

public static final String CAPTCHA_INPUT_NAME = "j_captcha";// 验证码输入表单名称

public static final String CAPTCHA_IMAGE_URL = "/captcha.jpg";// 验证码图片URL

private static final Integer MIN_WORD_LENGTH = 4;// 验证码最小长度

private static final Integer MAX_WORD_LENGTH = 4;// 验证码最大长度

private static final Integer IMAGE_HEIGHT = 28;// 验证码图片高度

private static final Integer IMAGE_WIDTH = 80;// 验证码图片宽度

private static final Integer MIN_FONT_SIZE = 16;// 验证码最小字体

private static final Integer MAX_FONT_SIZE = 16;// 验证码最大字体

private static final String RANDOM_WORD = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";// 随机字符

private static final String IMAGE_PATH = "./captcha/";// 随机背景图片路径

// 验证码随机字体

private static final Font[] RANDOM_FONT = new Font[] {

new Font("nyala", Font.BOLD, MIN_FONT_SIZE),

new Font("Arial", Font.BOLD, MIN_FONT_SIZE),

new Font("Bell MT", Font.BOLD, MIN_FONT_SIZE),

new Font("Credit valley", Font.BOLD, MIN_FONT_SIZE),

new Font("Impact", Font.BOLD, MIN_FONT_SIZE)

};

// 验证码随机颜色

private static final Color[] RANDOM_COLOR = new Color[] {

new Color(255, 255, 255),

new Color(255, 220, 220),

new Color(220, 255, 255),

new Color(220, 220, 255),

new Color(255, 255, 220),

new Color(220, 255, 220)

};

// 生成验证码

@Override

protected void buildInitialFactories() {

RandomListColorGenerator randomListColorGenerator = new RandomListColorGenerator(RANDOM_COLOR);

BackgroundGenerator backgroundGenerator = new FileReaderRandomBackgroundGenerator(IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_PATH);

WordGenerator wordGenerator = new RandomWordGenerator(RANDOM_WORD);

FontGenerator fontGenerator = new RandomFontGenerator(MIN_FONT_SIZE, MAX_FONT_SIZE, RANDOM_FONT);

TextDecorator[] textDecorator = new TextDecorator[] {};

TextPaster textPaster = new DecoratedRandomTextPaster(MIN_WORD_LENGTH, MAX_WORD_LENGTH, randomListColorGenerator, textDecorator);

WordToImage wordToImage = new ComposedWordToImage(fontGenerator, backgroundGenerator, textPaster);

addFactory(new GimpyFactory(wordGenerator, wordToImage));

}

}

复制代码代码如下:

package com.g.core.common.JCaptcha;

import com.octo.captcha.service.captchastore.FastHashMapCaptchaStore;

import com.octo.captcha.service.image.DefaultManageableImageCaptchaService;

import com.octo.captcha.service.image.ImageCaptchaService;

public class CaptchaServiceSingleton {

private static ImageCaptchaService instance =null;

public CaptchaServiceSingleton() {

}

// 使用synchronized关键字解决线程不安全

public synchronized static ImageCaptchaService getInstance() {

if (instance == null) {

instance = new DefaultManageableImageCaptchaService(new FastHashMapCaptchaStore(), new JCaptchaEngine(), 180,

100000 , 75000);

}

return instance;

}

}

复制代码代码如下:

package com.g.core.render;

import java.awt.image.BufferedImage;

import java.io.IOException;

import javax.imageio.ImageIO;

import javax.servlet.ServletOutputStream;

import com.g.core.common.JCaptcha.CaptchaServiceSingleton;

import com.jfinal.kit.StringKit;

import com.jfinal.render.Render;

public class JCaptchaRender extends Render {

private String randomCodeKey;

public JCaptchaRender(String randomCodeKey) {

if (StringKit.isBlank(randomCodeKey))

throw new IllegalArgumentException("randomCodeKey can not be blank");

this.randomCodeKey = randomCodeKey;

}

@Override

public void render() {

response.setHeader("Cache-Control", "no-store");

response.setHeader("Pragma", "no-cache");

response.setDateHeader("Expires", 0);

response.setContentType("image/jpeg");

ServletOutputStream sos = null;

try {

sos = response.getOutputStream();

//String captchaId = request.getSession(true).getId();

BufferedImage challenge = (BufferedImage) CaptchaServiceSingleton.getInstance().getChallengeForID(randomCodeKey, request.getLocale());

ImageIO.write(challenge, "jpg", sos);

sos.flush();

} catch (Exception e) {

throw new RuntimeException(e);

}

finally {

if (sos != null)

try {sos.close();} catch (IOException e) {e.printStackTrace();}

}

}

}

复制代码代码如下:

public void random_code() {

render(new JCaptchaRender(getSession().getId()));

}