jfinal添加jcaptcha验证码实现方法

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));
 }

}

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;
 }

}

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();}
  }
 }

}

public void random_code() {
     render(new jcaptcharender(getsession().getid()));
 }