java 是一种可以撰写跨平台应用软件的面向对象的程序设计语言,是由 Sun Microsystems 公司于 1995 年 5 月推出的 Java 程序设计语言和 Java 平台(即 JavaEE(j2ee), JavaME(j2me), JavaSE(j2se))的总称。
这篇文章主要介绍了 java 仿 Servlet 生成验证码实例详解的相关资料, 需要的朋友可以参考下
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
来源: http://www.phperz.com/article/17/1223/357323.html