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  • javaweb-servlet生成简单的验证码

    package com.serv;
    
    import java.awt.Color;
    import java.awt.Graphics;
    import java.awt.image.BufferedImage;
    import java.io.IOException;
    import java.util.Random;
    
    import javax.imageio.ImageIO;
    import javax.servlet.ServletException;
    import javax.servlet.ServletOutputStream;
    import javax.servlet.annotation.WebServlet;
    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    @WebServlet(urlPatterns={"/Servyzm"})
    public class Servyzm extends HttpServlet {
        
        @Override
        protected void doGet(HttpServletRequest req, HttpServletResponse resp)
                throws ServletException, IOException {
            // TODO 自动生成的方法存根
            doPost(req, resp);
        }
        @Override
        protected void doPost(HttpServletRequest req, HttpServletResponse resp)
                throws ServletException, IOException {
            // TODO 自动生成的方法存根
            Random r = new Random();
            //创建图片缓冲流
            BufferedImage buf = new BufferedImage(70, 25, BufferedImage.TYPE_INT_RGB);
            Graphics g = buf.getGraphics();//获取图片的画布对象
            g.fillRect(0, 0, 70,25);//从左上角开始(0,0)坐标开始填充白色,宽70,高25
            g.setColor(new Color(150,150,150));//指定的是显示的字体的颜色
            String str = r.nextInt(9000)+1000+"";
            g.drawString(str, 20, 20);// drawString(String str, int x, int y)str指的是输出的文本;x,y指的是距离左上角的位置
            for (int i = 0; i < 8; i++) {
                int startx = r.nextInt(120);
                int starty = r.nextInt(30);
                g.setColor(new Color(startx, 232, starty));
                g.drawLine(startx, starty, startx + 10, starty + 10);
            }
            ServletOutputStream out = resp.getOutputStream();// 获取字节流
            ImageIO.write(buf, "jpg", out);
        }
    //    public static int getString(){
    //        
    //    }
    }

     运行截图:

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  • 原文地址:https://www.cnblogs.com/a1045417817/p/7565407.html
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