Jcaptcha验证码生成组件用法
1.创建项目JcaptchaDemo
2.引入相关.jar文件
jcaptcha-1.0-all.jar；
commons-logging-1.0.4.jar；
commons-collections-2.1.1.jar
3.创建GMailEngine，仿照JCaptcha2.0编写GMail验证码样式的图片引擎.，具体的代码如下：
设置生成验证的样式就是在这里设置。
package com.zsw.servlet;
import java.awt.Color;
import java.awt.Font;
import java.awt.image.ImageFilter;
import com.octo.captcha.component.image.backgroundgenerator.BackgroundGenerator;
import com.octo.captcha.component.image.backgroundgenerator.UniColorBackgroundGenerator;
import com.octo.captcha.component.image.color.RandomListColorGenerator;
import com.octo.captcha.component.image.deformation.ImageDeformation;
import com.octo.captcha.component.image.deformation.ImageDeformationByFilters;
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.DeformedComposedWordToImage;
import com.octo.captcha.component.image.wordtoimage.WordToImage;
import com.octo.captcha.component.word.FileDictionary;
import com.octo.captcha.component.word.wordgenerator.ComposeDictionaryWordGenerator;
import com.octo.captcha.component.word.wordgenerator.WordGenerator;
import com.octo.captcha.engine.image.ListImageCaptchaEngine;
import com.octo.captcha.image.gimpy.GimpyFactory;
/**
* 仿照JCaptcha2.0编写GMail验证码样式的图片引擎.
* @author Administrator
*/
public
class GMailEngine
extends ListImageCaptchaEngine {
@Override
protected
void buildInitialFactories() {
int minWordLength = 4;
int maxWordLength = 5;
int fontSize = 24;
int imageWidth = 100;
int imageHeight = 40;
//word generator
WordGenerator dictionnaryWords =
new ComposeDictionaryWordGenerator(
new FileDictionary(
"toddlist"));
//word2image components
TextPaster randomPaster =
new DecoratedRandomTextPaster(
minWordLength,
maxWordLength,
new RandomListColorGenerator(
new Color[] {
new Color(23, 170, 27),
new Color(220, 34, 11),
new Color(23, 67, 172)
}),
new TextDecorator[] {}
);
BackgroundGenerator background =
new UniColorBackgroundGenerator(imageWidth, imageHeight, Color.white);
FontGenerator font =
new RandomFontGenerator(
fontSize,
fontSize,
new Font[] {
new Font(
"nyala", Font.BOLD, fontSize),
new Font(
"Bell MT", Font.PLAIN, fontSize),
new Font(
"Credit valley", Font.BOLD, fontSize)
});
ImageDeformation postDef =
new ImageDeformationByFilters(
new ImageFilter[] {});
ImageDeformation backDef =
new ImageDeformationByFilters(
new ImageFilter[] {});
ImageDeformation textDef =
new ImageDeformationByFilters(
new ImageFilter[] {});
WordToImage word2image =
new DeformedComposedWordToImage(font, background, randomPaster, backDef, textDef,postDef);
addFactory(
new GimpyFactory(dictionnaryWords, word2image));
}
}
4.在这里创建一个单例类：
package com.zsw.servlet;
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 =
new DefaultManageableImageCaptchaService(
new FastHashMapCaptchaStore(),
new GMailEngine(), 180, 100000,75000);
public
static ImageCaptchaService getInstance() {
return instance;
}
}
5.创建ImageCaptchaServlet.java，它是一个Servlet
图片src，制定这个Servlet在Web.xml中配置的名称，获取验证码图片。具体的内容如下：
package com.zsw.servlet;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.octo.captcha.service.CaptchaServiceException;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
public
class ImageCaptchaServlet
extends HttpServlet {
private
static
final
long serialVersionUID = 1L;
public ImageCaptchaServlet() {
}
protected
void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
byte[] captchaChallengeAsJpeg = null;
ByteArrayOutputStream jpegOutputStream =
new ByteArrayOutputStream();
try {
String captchaId = request.getSession().getId();
BufferedImage challenge = CaptchaServiceSingleton.getInstance().getImageChallengeForID(captchaId,request.getLocale());
JPEGImageEncoder jpegEncoder = JPEGCodec.createJPEGEncoder(jpegOutputStream);
jpegEncoder.encode(challenge); }
catch (IllegalArgumentException e) {
response.sendError(HttpServletResponse.SC_NOT_FOUND);
return;
}
catch (CaptchaServiceException e) {
response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
return;
}
captchaChallengeAsJpeg = jpegOutputStream.toByteArray();
// flush it in the response
response.setHeader(
"Cache-Control",
"no-store");
response.setHeader(
"Pragma",
"no-cache");
response.setDateHeader(
"Expires", 0);
response.setContentType(
"image/jpeg");
ServletOutputStream responseOutputStream = response.getOutputStream();
responseOutputStream.write(captchaChallengeAsJpeg);
responseOutputStream.flush();
responseOutputStream.close();
}
protected
void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
}
}
6.创建index.jsp以及sample.jsp
index.jsp
%@ page language=
"java"
contentType=
"text/html; charset=UTF-8"
pageEncoding=
"UTF-8"
%>
<
!DOCTYPE html
"-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd"
>
<
html>
<
head>
<
meta
"Content-Type"
content=
"text/html; charset=UTF-8"
>
<
title>Insert title here<
/title>
<
/head>
<
body>
<
form
"sample.jsp"
>
<
table style=
"width:300px; height:30px;"
cellpadding=
"1"
cellspacing=
"1"
border=
"1"
>
<
tr>
<
td
"right"
>
<
input
'text'
name=
'j_captcha_response'
value=
''
>
<
/td>
<
td
"left"
>
<
img
"ImageCaptchaServlet"
>
<
/td>
<
/tr>
<
/table>
<
/form>
<
/body>
<
/html>
sample.jsp：处理检验验证码
%@ page language=
"java"
contentType=
"text/html; charset=ISO-8859-1"
pageEncoding=
"UTF-8"
%>
<
%@page import=
"com.octo.captcha.service.CaptchaServiceException"
%>
<
%@page import=
"com.zsw.servlet.CaptchaServiceSingleton"
%>
<
%
Boolean isResponseCorrect = Boolean.FALSE;
String captchaId = request.getSession().getId();
String
"j_captcha_response"
);
try {
isResponseCorrect = CaptchaServiceSingleton.getInstance().validateResponseForID(captchaId, responsestr);
if(isResponseCorrect){
}else{
out.print(
"It's worng......"
);
}
} catch (CaptchaServiceException e) {
}
%>
7.启动服务，运行程序效果如下：
8, 对设置验证样式的引擎类，进行重构，及支持验证码有背景图片
8.1 创建com.zsw.captcha包，将相关背景图片放入该包中；
8.2 创建JCaptchaEngine.java，具体内容如下：
package com.zsw.common;
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 = "./com/zsw/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);
// 验证码随机颜色
BackgroundGenerator backgroundGenerator =
new FileReaderRandomBackgroundGenerator(IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_PATH);
//验证码背景图片
WordGenerator wordGenerator =
new RandomWordGenerator(RANDOM_WORD);
FontGenerator fontGenerator =
new RandomFontGenerator(MIN_FONT_SIZE, MAX_FONT_SIZE, RANDOM_FONT);
// 验证码随机字体
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));
}
}
8.3 修改第4步中的单例类，具体内容如下：
package com.zsw.servlet;
import com.octo.captcha.service.captchastore.FastHashMapCaptchaStore;
import com.octo.captcha.service.image.DefaultManageableImageCaptchaService;
import com.octo.captcha.service.image.ImageCaptchaService;
import com.zsw.common.JCaptchaEngine;
public
class CaptchaServiceSingleton {
private
static ImageCaptchaService instance =
new DefaultManageableImageCaptchaService(
new FastHashMapCaptchaStore(),
new180, 100000,75000);
public
static ImageCaptchaService getInstance() {
return instance;
}
}
8.4 运行启动，效果图如下：
1.参考相关文章
http://www.iteye.com/topic/567144
标签：java,octo,Jcaptcha,image,验证码,captcha,import,new,com From： https://blog.51cto.com/u_15739274/5951098