关于struts分页和防灌水的随机验证码
本人今年毕业生，正在实习，手头的小项目需要这两个东西，请大家指点指点啊

最好能给点代码读读，谢谢各位前辈了啊

一定给大分

[解决办法]
分页 http://blog.csdn.net/shan_wei/archive/2005/04/27/364912.aspx
[解决办法]
验证码：

import java.io.IOException;
import javax.servlet.*;
import javax.servlet.http.*;
import java.awt.*;
import java.awt.image.*;
import java.util.*;
import javax.imageio.*;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class CheckCode extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

response.setContentType( "image/jpeg ");
response.setHeader( "Pragma ", "No-cache ");
response.setHeader( "Cache-Control ", "no-cache ");
response.setDateHeader( "Expires ", 0);
HttpSession session = request.getSession();
// 在内存中创建图象
int width = 90, 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( "Arial ", Font.BOLD | Font.ITALIC, 16));

// 画边框
// g.setColor(new Color());
// g.drawRect(0,0,width-1,height-1);

// 随机产生155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 < 155; 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);
}

// 存储校验码字符串数组
String[] codearray = { "1 ", "2 ", "3 ", "4 ", "5 ", "6 ", "7 ", "8 ", "9 ",
"0 ", "A ", "B ", "C ", "D ", "E ", "F ", "G ", "H ", "I ", "J ", "K ",
"L ", "M ", "N ", "O ", "P ", "Q ", "R ", "S ", "T ", "U ", "V ", "W ",
"X ", "Y ", "Z " };

// 随机产生6位认证码
String sRand = " ";
for (int i = 0; i < 6; i++) {

String rand = codearray[random.nextInt(36)];
sRand += rand;
// 将认证码显示到图象中
g.setColor(new Color(20 + random.nextInt(10), 20 + random
.nextInt(90), 20 + random.nextInt(200))); g.drawString(rand, 13 * i + 6, 16);
}

// 将认证码存入SESSION
session.setAttribute( "rand ", sRand);
// 图象生效
g.dispose();
ServletOutputStream responseOutputStream = response.getOutputStream();
// 输出图象到页面
ImageIO.write(image, "JPEG ", responseOutputStream);

responseOutputStream.flush();
responseOutputStream.close();
}

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);
}

public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

this.doGet(request, response);
}
}

页面调用：
<img src= "checkcode "/>
[解决办法]
mark
[解决办法]
路过，帮顶
[解决办法]
Servlet ?
你不是用STRUTS 做吗.?

[解决办法]
顶
[解决办法]
struts+servlet相结合可成....
[解决办法]
Image.jsp
<%@ page language= "java " import= "java.util.* " pageEncoding= "GBK "%>
<%@ page contentType= "image/jpeg " import= "java.awt.*,
java.awt.image.*,javax.imageio.*,java.net.* " %>



<%!
Color getRandColor(int fc,int bc){//random color
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);
}
%>
<%
//page no cache
response.setHeader( "Pragma ", "No-cache ");
response.setHeader( "Cache-Control ", "no-cache ");
response.setDateHeader( "Expires ", 0);

// create image in memory
int width=60, height=20;
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

// get GraphicContext
Graphics g = image.getGraphics();


Random random = new Random();

// set background
g.setColor(getRandColor(200,250));
g.fillRect(0, 0, width, height);

//set font
g.setFont(new Font( "Times New Roman ",Font.PLAIN,18));

//set border
//g.setColor(new Color());
//g.drawRect(0,0,width-1,height-1);

// generate confusing lines
g.setColor(getRandColor(160,200));
for (int i=0;i <155;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);
}

// 4 bit random number 随即写出4个数字
String sRand= " ";
for (int i=0;i <4;i++){
String rand=String.valueOf(random.nextInt(10));
sRand+=rand;
// put validation code to image
g.setColor(new Color(20+random.nextInt(110),20+random.nextInt(110),20+random.nextInt(110)));
g.drawString(rand,13*i+6,16);
}

// save code to SESSION 传递图片中的数字
session.setAttribute( "rand ",sRand);

g.dispose();

// display image
ImageIO.write(image, "JPEG ", response.getOutputStream());
out.clear();
out = pageContext.pushBody();
%>


Login.jsp

<tr>
<td>
验证码：
</td>
<td>
<html:text property= "image "> </html:text>
</td>
<td>
<img width= "60 " height= "20 " src= " <%=basePath%> /image.jsp ">
</td>
</tr>


loginAction
String validatecode=(String)session.getAttribute( "rand ");
//获取image.jsp中传递的数字值
String inputcode=logonForm.getImage();
//从login.jsp中获取文本框输入的值
if(validatecode.equals(inputcode)){ //如果两个相等
登陆
}else
{
String error= "验证码错误,请重新输入..... ";
request.setAttribute( "error ", error);
return mapping.findForward( "fail ");
}