这篇文章主要介绍了java  实现输出随机图片实例代码的相关资料,需要的朋友可以参考下
java  实现输出随机图片实例代码
输出随机图片(captcha图像):completely automated public turing test to tell computers and humans apart (全自动区分计算机和人类的测试)
相关主要类(jdk 查看api)
bufferedimage:内存图像
graphics：画笔
imageio：输出图像
放在html页面上83bc49b7e8bcbe1e90eb7bc15fbd721e
注意：浏览器默认会缓存图片
public static int width = 120; public static int height = 25; public void doget(httpservletrequest request, httpservletresponse response) throws servletexception, ioexception { response.setcontenttype("text/html"); //创建内存图像 bufferedimage image = new bufferedimage(width,height,bufferedimage.type_int_rgb); //勾勒图像 graphics graphics = image.getgraphics(); //设置背景 graphics.setcolor(color.white); graphics.fillrect(0, 0, width, height); //设置边框 graphics.setcolor(color.blue); graphics.drawrect(1, 1, width-2, height-2); //画干扰线 graphics.setcolor(color.yellow); for(int i=0;i<8;i++){ int xstart = new random().nextint(width); int ystart = new random().nextint(height); int xend = new random().nextint(width); int yend = new random().nextint(height); graphics.drawline(xstart, ystart, xend, yend); } //写随机数 graphics.setcolor(color.red); int x = 5; for(int i=0;i<4;i++){ graphics.drawstring(new random().nextint(9)+"", x, 20); x+=30; } response.setcontenttype("image/jpeg");//设置响应格式 imageio.write(image, "jpeg", response.getoutputstream()); }
以上就是java实现随机图片生成的实例代码的详细内容。