验证码Kaptcha快速入门

来源：互联网发布：逆战刷枪软件2017 编辑：程序博客网时间：2024/06/06 17:22

验证码Kaptcha简单使用方法

引入jar包

<groupId>com.google.code.kaptcha</groupId>

<artifactId>kaptcha</artifactId>

</dependency>

配置web.xml

<servlet-name>Kaptcha</servlet-name>

<servlet-class>

com.google.code.kaptcha.servlet.KaptchaServlet

<!--自己的算式验证码

com.th.mykaptcha.KaptchaServlet

-->

</servlet-class>

<init-param>

<param-name>kaptcha.border</param-name>

<param-value>yes</param-value>

</init-param>

<init-param>

边框颜色，合法值： r,g,b (and optional alpha) 或者

white,black,blue.

</description>

<param-name>kaptcha.border.color</param-name>

<param-value>black</param-value>

</init-param>

<init-param>

<param-name>kaptcha.border.thickness</param-name>

<param-value>1</param-value>

</init-param>

<init-param>

<param-name>kaptcha.image.width</param-name>

<param-value>200</param-value>

</init-param>

<init-param>

<param-name>kaptcha.image.height</param-name>

<param-value>50</param-value>

</init-param>

<init-param>

<description>图片实现类</description>

<param-name>kaptcha.producer.impl</param-name>

<param-value>

com.google.code.kaptcha.impl.DefaultKaptcha

</param-value>

</init-param>

<init-param>

<description>文本实现类</description>

<param-name>kaptcha.textproducer.impl</param-name>

<param-value>

<!-- 自己实现的中文实现类

com.th.mykaptcha.ChineseText

-->

com.google.code.kaptcha.text.impl.DefaultTextCreator

</param-value>

</init-param>

<init-param>

<description>文本集合，验证码值从此集合中获取</description>

<param-name>kaptcha.textproducer.char.string</param-name>

<param-value>1234567890</param-value>

</init-param>

<init-param>

<description>验证码长度 5</description>

<param-name>kaptcha.textproducer.char.length</param-name>

<param-value>4</param-value>

</init-param>

<init-param>

<description>字体Arial, Courier</description>

<param-name>kaptcha.textproducer.font.names</param-name>

<param-value>Arial, Courier</param-value>

</init-param>

<init-param>

<param-name>kaptcha.textproducer.font.size</param-name>

<param-value>40</param-value>

</init-param>

<init-param>

字体颜色，合法值： r,g,b 或者white,black,blue.

</description>

<param-name>kaptcha.textproducer.font.color</param-name>

<param-value>black</param-value>

</init-param>

<init-param>

<param-name>kaptcha.textproducer.char.space</param-name>

<param-value>2</param-value>

</init-param>

<init-param>

<description>干扰实现类</description>

<param-name>kaptcha.noise.impl</param-name>

<param-value>

com.google.code.kaptcha.impl.DefaultNoise

</param-value>

</init-param>

<init-param>

干扰颜色，合法值： r,g,b 或者white,black,blue.

</description>

<param-name>kaptcha.noise.color</param-name>

<param-value>black</param-value>

</init-param>

<init-param>

图片样式：水纹com.google.code.kaptcha.impl.WaterRipple

鱼眼com.google.code.kaptcha.impl.FishEyeGimpy

阴影com.google.code.kaptcha.impl.ShadowGimpy

</description>

<param-name>kaptcha.obscurificator.impl</param-name>

<param-value>

com.google.code.kaptcha.impl.WaterRipple

</param-value>

</init-param>

<init-param>

<description>背景实现类</description>

<param-name>kaptcha.background.impl</param-name>

<param-value>

com.google.code.kaptcha.impl.DefaultBackground

</param-value>

</init-param>

<init-param>

<description>背景颜色渐变，开始颜色</description>

<param-name>kaptcha.background.clear.from</param-name>

<param-value>green</param-value>

</init-param>

<init-param>

<description>背景颜色渐变，结束颜色</description>

<param-name>kaptcha.background.clear.to</param-name>

<param-value>white</param-value>

</init-param>

<init-param>

<description>文字渲染器</description>

<param-name>kaptcha.word.impl</param-name>

<param-value>

com.google.code.kaptcha.text.impl.DefaultWordRenderer

</param-value>

</init-param>

<init-param>

session中存放验证码的key键

</description>

<param-name>kaptcha.session.key</param-name>

<param-value>KAPTCHA_SESSION_KEY</param-value>

</init-param>

<init-param>

The date the kaptchais generated is put into the

HttpSession. This isthe key value for that item in the

session.

</description>

<param-name>kaptcha.session.date</param-name>

<param-value>KAPTCHA_SESSION_DATE</param-value>

</init-param>

</servlet>

<servlet-mapping>

<servlet-name>Kaptcha</servlet-name>

<url-pattern>/randomcode.jpg</url-pattern>

</servlet-mapping>

页面使用方法

点击验证码图片刷新验证码：

functionchangeR(node){

// 用于点击时产生不同的验证码

node.src= "randomcode.jpg?time="+new Date().getTime() ;

}

</script>

扩展：显示中文验证码

将上面的web.xml的文本实现类修改为圈中的类

ChineseText类具体代码

import java.util.Random;

import com.google.code.kaptcha.text.TextProducer;

import com.google.code.kaptcha.util.Configurable;

public class ChineseText extends Configurableimplements TextProducer {

public String getText() {

int length= getConfig().getTextProducerCharLength();

//char[] charS = getConfig().getTextProducerCharString();

String[]s = newString[]{"我","是","验","证","码"};

Randomrand = newRandom();

StringBuffersb = newStringBuffer();

for(inti = 0;i<length; i++){

int ind = rand.nextInt(s.length);

sb.append(s[ind]);

}

return sb.toString();

}

/**

* 自定义数字加字母验证码

* @return

public String getText1() {

int length= getConfig().getTextProducerCharLength();

StringfinalWord = "",firstWord = "";

int tempInt= 0;

String[]array = { "0","1", "2","3","4","5","6","7", "8","9",

"a", "b","c", "d","e","f"};

Randomrand = newRandom();

for (inti = 0;i<length; i++){

switch (rand.nextInt(array.length)){

case 1:

tempInt = rand.nextInt(26)+ 65;

firstWord = String.valueOf((char)tempInt);

break;

case 2:

intr1,r2,r3,r4;

StringstrH,

strL;// high&low

r1 = rand.nextInt(3)+ 11; // ǰ�պ�[11,14)

if (r1 ==13) {

r2 = rand.nextInt(7);

}else {

r2 = rand.nextInt(16);

}

r3 = rand.nextInt(6)+ 10;

if (r3 ==10) {

r4 = rand.nextInt(15)+ 1;

}else if(r3 == 15) {

r4 = rand.nextInt(15);

}else {

r4 = rand.nextInt(16);

}

strH = array[r1] + array[r2];

strL = array[r3] + array[r4];

byte[]bytes=newbyte[2];

bytes[0] = (byte)(Integer.parseInt(strH, 16));

bytes[1] = (byte)(Integer.parseInt(strL, 16));

firstWord = newString(bytes);

break;

default:

tempInt = rand.nextInt(10)+ 48;

firstWord = String.valueOf((char)tempInt);

break;

}

finalWord += firstWord;

}

return finalWord;

}

算式验证码：

修改web.xml配置：

KaptchaServlet代码：

import java.awt.image.BufferedImage;

import java.io.IOException;

import java.util.Enumeration;

import java.util.Properties;

import javax.imageio.ImageIO;

import javax.servlet.Servlet;

import javax.servlet.ServletConfig;

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.google.code.kaptcha.Producer;

import com.google.code.kaptcha.util.Config;

public class KaptchaServletextends HttpServletimplements Servlet {

private Properties props;

private Producer kaptchaProducer;

private String sessionKeyValue;

public KaptchaServlet() {

this.props=new Properties();

this.kaptchaProducer=null;

this.sessionKeyValue=null;

}

public voidinit(ServletConfig conf) throws ServletException {

super.init(conf);

ImageIO.setUseCache(false);

EnumerationinitParams =conf.getInitParameterNames();

while (initParams.hasMoreElements()){

Stringkey = (String) initParams.nextElement();

Stringvalue = conf.getInitParameter(key);

this.props.put(key,value);

}

Configconfig = newConfig(this.props);

this.kaptchaProducer=config.getProducerImpl();

this.sessionKeyValue=config.getSessionKey();

}

public voiddoGet(HttpServletRequest req,HttpServletResponseresp)

throws ServletException, IOException {

resp.setDateHeader("Expires",0L);

resp.setHeader("Cache-Control","no-store, no-cache, must-revalidate");

resp.addHeader("Cache-Control","post-check=0, pre-check=0");

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

resp.setContentType("image/jpeg");

StringcapText = this.kaptchaProducer.createText();

Strings1 = capText.substring(0,1);

Strings2 = capText.substring(1,2);

int r =Integer.valueOf(s1).intValue() +Integer.valueOf(s2).intValue();

req.getSession().setAttribute(this.sessionKeyValue,String.valueOf(r));

BufferedImagebi = this.kaptchaProducer.createImage(s1+"+"+s2+"=?");

ServletOutputStreamout = resp.getOutputStream();

ImageIO.write(bi, "jpg",out);

try {

out.flush();

}finally {

out.close();

}

后台获取验证码值：

(String)request.getSession().getAttribute(com.google.code.kaptcha.Constants.KAPTCHA_SESSION_KEY);

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