java仿Servlet生成验证码实例详解
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2024-02-28 11:49:16
java仿servlet生成验证码实例详解
实现原理:使用bufferedimage对象的graphics来进行绘制,然后输出成一张图片进行保存
实现代码及详解:...
java仿servlet生成验证码实例详解
实现原理:使用bufferedimage对象的graphics来进行绘制,然后输出成一张图片进行保存
实现代码及详解:
public class validatecode{ private static random rand = new random(); public static void main(string[] args){ int val1 = rand.nextint(9); int val2 = rand.nextint(9); int val3 = rand.nextint(9); int val4 = rand.nextint(9); string val = val1 + " " + val2 + " " + val3 + " " + val4' bufferedimage buf = drawimage(val); //将最终的图片保存到d://cheng.png下 imageio.write(buf,"png",new file("d://cheng.png"); } public static bufferedimage drawimage(string code){ int height = 30; int width = 60; bufferedimage buf = new bufferedimage(width,height,bufferedimage.type_int_rgb); graphics2d gs = buf.creategraphics(); gs.setbackground(color.black); gs.drawrect(0,0,width,height); //绘制随机干扰线 int total = 100; drawrandline(gs,total); //绘制验证码 font font = new font("行楷",font.bold,20); gs.setfont(font); gs.setcolor(getrandcolor(155,255)); gs.drawstring(code,5,20); return buf; } public static void drawrandline(graphics2d gs,int total){ for(int i=0; i<total; i++){ int x1 = rand.nextint(width); int x2 = rand.nextint(width); int y1 = rand.nextint(height); int y2 = rand.nextint(height); //设置随机颜色 gs.setcolor(getrandcolor(0,155)); gs.drawline(x1,y1,x2,y2); } } public static color getrandcolor(int from,int to){ int r = from + rand.nextint(to-from); int g = from + rand.nextint(to-from); int b = from + rand.nextint(to-from); return new color(r,g,b); }
最终实现效果图
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