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为shark的jspClient增加一个带验证码的登陆界面

王朝java/jsp·作者佚名 2006-01-09

1：登陆界面如下

2：登陆结果

3：代码如下

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<%@ page language="java" contentType="text/html; charset=utf-8" %>

<%@ taglib uri="/WEB-INF/struts-html.tld" prefix="html" %>

<%@ taglib uri="/WEB-INF/struts-bean.tld" prefix="bean" %>

<html:html xhtml="true" locale="true">

<head>

<title>Shark Test</title>

<html:base/>

</head>

<body>

<html:form action="/processLogin">

<tbody>

<tr>

</tr>

<tr>

</tr>

<tr>

<html:text property="username" size="20" maxlength="50"/>

</td>

<td>

<html:link action=""><bean:message key="info.noRegister"/>?</html:link>

</td>

</tr>

<tr>

<html:password property="passwd" size="20" maxlength="50"/>

</td>

<td>

<html:link action=""><bean:message key="info.forgetPassword"/>?</html:link>

</td>

</tr>

<tr>

<html:text property="authcode" size="6" maxlength="6" ></html:text>

</td>

<td>

</td>

</tr>

<tr>

</tr>

</tbody>

</table>

</html:form>

</body>

</html:html>

AuthorizationCodeImg.java

* 创建日期 2004-12-29

package hk.com.csl.comm.util;

/**

* <p>Title: Shark Test</p>

* <p>Description: Shark Test System</p>

* <p>Company: Completesolution Solution(GD) Company</p>

* @author Jason

* @version 1.0

import hk.com.csl.comm.util.CreateImage;

import javax.servlet.*;

import javax.servlet.http.*;

import java.io.*;

import com.sun.image.codec.jpeg.*;

import java.awt.image.*;

public class AuthorizationCodeImg

extends HttpServlet {

//Initialize global variables

public void init() throws ServletException {

}

//Process the HTTP Get request

public void doGet(HttpServletRequest request, HttpServletResponse response) throws

ServletException, IOException {

response.setContentType("image/jpeg");

CreateImage createImg = new CreateImage();

ServletOutputStream out = response.getOutputStream();

BufferedImage image = createImg.createImg(6);

JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);

encoder.encode(image);

out.close();

HttpSession session = request.getSession();

session.setAttribute("rand",createImg.sRand);

}

//Process the HTTP Post request

public void doPost(HttpServletRequest request, HttpServletResponse response) throws

ServletException, IOException {

doGet(request, response);

}

//Clean up resources

public void destroy() {

}

CreateImage.java（此段代码从网上所得，稍作修改）

* 创建日期 2004-12-29

package hk.com.csl.comm.util;

/**

* <p>Title: Shark Test</p>

* <p>Description: Shark Test System</p>

* <p>Company: Completesolution Solution(GD) Company</p>

* @author Jason

* @version 1.0

import java.awt.*;

import java.awt.image.*;

import java.util.*;

import hk.com.csl.comm.util.CreateRandomString;

public class CreateImage {

public String sRand="";

/**

* Get Random Color

* @param fc

* @param bc

* @return Color

public Color getRandColor(int fc,int bc){

//给定范围获得随机颜色

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);

}

/**

* Create a image

* @param size

* @return image

public BufferedImage createImg(int size){

// 在内存中创建图象

//int width=60, height=20;

int width=12*size, height=20;

BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

// 获取图形上下文

Graphics g = image.getGraphics();

//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));

//画边框

//g.setColor(new Color());

//g.drawRect(0,0,width-1,height-1);

// 随机产生100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<100;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(size位字符串)

String rand = new CreateRandomString().getRandomString(size);

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,6,16);

// 图象生效

g.dispose();

return image;

}

CreateRandomString.java

* 创建日期 2004-12-29

package hk.com.csl.comm.util;

/**

* <p>Title: 产生随机字符串</p>

* <p>Description: Shark Test System</p>

* <p>Company: Completesolution Solution(GD) Company</p>

* @author Jason

* @version 1.0

import java.util.*;

public class CreateRandomString{

public CreateRandomString() {

}

//Main method

//public static String getRandomString(int size){

/**

* Get String Created by Random Function

* @param size

* @return String

public String getRandomString(int size){

//char[] c={'!','@','#','$','%','*','&','^','(',')','<','>','{','}','[',']','?','/','1','2','3','4','5','6','7','8','9','0','q','w','e','r','t','y','u','i','o','p','a','s','d','f','g','h','j','k','l','z','x','c','v','b','n','m'};

char[] c={'1','2','3','4','5','6','7','8','9','0','q','w','e','r','t','y','u','i','o','p','a','s','d','f','g','h','j','k','l','z','x','c','v','b','n','m'};

Random random = new Random(); //初始化随机数产生器

StringBuffer sb =new StringBuffer();

for(int i=0;i<size;i++){

sb.append(c[Math.abs(random.nextInt()) %c.length]);

}

return sb.toString();

}

public static void main(String[] args) {

try {

String needString=getRandomString(20);

System.out.println(needString);

}