温馨提示×

温馨提示×

您好,登录后才能下订单哦!

密码登录×
登录注册×
其他方式登录
点击 登录注册 即表示同意《亿速云用户服务条款》

java验证码学习一

发布时间:2020-08-02 17:58:40 来源:网络 阅读:416 作者:知止内明 栏目:软件技术
package com.sys.web.sesoion;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.util.Random;
import javax.imageio.ImageIO;
import javax.servlet.http.HttpSession;

public class CheckCodeServlet extends HttpServlet {

    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        BufferedImage image = new BufferedImage(50,25,BufferedImage.TYPE_INT_RGB);
        Graphics g = image.getGraphics();
        g.drawString(Token.getNum(),15,15);
        ImageIO.write(image,"JPG",response.getOutputStream());
        response.setHeader("expires","-1");
        response.setHeader("cache-control","no-cache");  //没有缓成
        response.setHeader("pragma","no-cache");

    }

}
//用于产生随机数
class Token{
    public static String getNum(){
        Random r = new Random();
        int num = r.nextInt(10000);
        return num + "";
    }
}

java验证码学习一

向AI问一下细节

免责声明:本站发布的内容(图片、视频和文字)以原创、转载和分享为主,文章观点不代表本网站立场,如果涉及侵权请联系站长邮箱:is@yisu.com进行举报,并提供相关证据,一经查实,将立刻删除涉嫌侵权内容。

AI