登陆图像校验码生成,那位朋友做过,能说说吗!!!Tks~~ 我下载了一个实现功能的,其实原理不是很难理解的!验证码是随机产生的数字,然后把这个数字生成显示在一张图片上!验证区直接显示这张图片就是那!但是用session保留生成的随机数用来实现校验的需要! 解决方案 » 免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货 刚刚弄的。一个servletpackage com.hull.validatecode;import java.util.*;import java.io.*;import java.awt.*;import java.awt.image.*;import javax.servlet.*;import javax.servlet.http.*;import com.sun.image.codec.jpeg.*;public class ValidateCode extends HttpServlet{ private Font imgFont = new Font("宋体",Font.BOLD,16); //设置字体 public void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException,IOException { doPost(request,response); } public void doPost(HttpServletRequest request,HttpServletResponse response) throws ServletException,IOException { String vCode = ""; int intCode = 0; intCode = (new Random()).nextInt(9999); if(intCode<1000) intCode += 1000; vCode = intCode+""; /* * 绘图 */ response.setContentType("image/gif"); ServletOutputStream vout = response.getOutputStream(); BufferedImage image = new BufferedImage(50,20,BufferedImage.TYPE_INT_RGB); Graphics graph = image.getGraphics(); // 设置背景颜色 graph.setColor(Color.white); graph.fillRect(1,1,48,18); //设置字体颜色 graph.setColor(Color.black); graph.setFont(imgFont); char c; for(int i=0;i<4;i++) { c = vCode.charAt(i); graph.drawString(c+"",9*i+4,16); } JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(vout); encoder.encode(image); // 对session赋值 HttpSession session = request.getSession(true); session.removeAttribute("VerifyCode"); session.setAttribute("VerifyCode",vCode); vout.close(); } }调用:<img src="ValidateCode" align="center"> 谢谢!能不能给一个完整的功能实现代码,包括jsp的..[email protected] struts2检验文件不起作用 各位大侠,公司有个网站,如何实现手机浏览 真要命的actionForm问题,高手帮忙 如何防止用户重复登陆?? servlets 的问题 着急 急 急 与数据库的连接自动关闭是怎么回事? 请教:如何使IE浏览器象QQ一样在右下脚的托盘里呢? 求救 关于时间类型向字符串以及字符串向时间类型的转换问题? 很急 Eclipse Memory Analyzer 查看内存溢出执行时间 怒了!绝对路径问题! http头用的是什么编码
import java.io.*;
import java.awt.*;
import java.awt.image.*;import javax.servlet.*;
import javax.servlet.http.*;import com.sun.image.codec.jpeg.*;public class ValidateCode extends HttpServlet
{
private Font imgFont = new Font("宋体",Font.BOLD,16); //设置字体
public void doGet(HttpServletRequest request,HttpServletResponse response)
throws ServletException,IOException
{
doPost(request,response);
}
public void doPost(HttpServletRequest request,HttpServletResponse response)
throws ServletException,IOException
{
String vCode = "";
int intCode = 0;
intCode = (new Random()).nextInt(9999);
if(intCode<1000)
intCode += 1000;
vCode = intCode+"";
/*
* 绘图
*/
response.setContentType("image/gif");
ServletOutputStream vout = response.getOutputStream();
BufferedImage image = new BufferedImage(50,20,BufferedImage.TYPE_INT_RGB);
Graphics graph = image.getGraphics();
// 设置背景颜色
graph.setColor(Color.white);
graph.fillRect(1,1,48,18);
//设置字体颜色
graph.setColor(Color.black);
graph.setFont(imgFont);
char c;
for(int i=0;i<4;i++)
{
c = vCode.charAt(i);
graph.drawString(c+"",9*i+4,16);
}
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(vout);
encoder.encode(image);
// 对session赋值
HttpSession session = request.getSession(true);
session.removeAttribute("VerifyCode");
session.setAttribute("VerifyCode",vCode);
vout.close();
}
}调用:
<img src="ValidateCode" align="center">
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