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锁定老帖子 主题:java实现网站登录验证码功能
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发表时间:2012-10-17
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { doPost(req, resp); } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { int width=800; int height=200; //BufferedImage(画板) BufferedImage image=new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB); //Graphics(画笔) Graphics p=image.getGraphics(); p.setColor(getRandomColor()); //使用画笔填充一个矩形区域 p.fillRect(0, 0, width, height); //画线 p.setColor(getRandomColor()); p.drawLine(0, height/2,width/2 ,0 ); p.drawLine(0, height/2, width/2, height); p.drawLine(width/2, 0, width, height/2); p.drawLine(width/2, height, width,height/2 ); //画图 p.setColor(getRandomColor()); int x=(int) (Math.random()*(width-height)); int y=0; p.fillOval(x, y, height, height); //随机的在画板上画100个园 for (int i = 0; i < 100; i++) { p.setColor(getRandomColor()); int rx=(int) (Math.random()*width); int ry=(int) (Math.random()*height); p.fillOval(rx, ry, 2, 2); } //随机画100条干扰线 for (int i = 0; i < 10; i++) { p.setColor(getRandomColor()); int x1=(int) (Math.random()*width); int y1=(int) (Math.random()*height); int x2=(int) (Math.random()*width); int y2=(int) (Math.random()*height); p.drawLine(x1, y1, x2, y2); } //画4个随机字符 int w=(width-5*6)/4; String code=""; p.setFont(new Font("Arial",Font.HANGING_BASELINE, 55)); for (int i = 0; i < 4; i++) { String s=getWord(); code=code+s; p.setColor(getRandomColor()); p.drawString(s, 6+i*(w+6), 50); } System.out.println("Fuck!!!!"+code); request.getSession().setAttribute("code", code); //ImageIO(快递) ImageIO.write(image, "png", response.getOutputStream()); } private Color getRandomColor(){ int r=(int) (Math.random()*256); int g=(int) (Math.random()*256); int b=(int) (Math.random()*256); return new Color(r,g,b); } public String getWord(){ int i=0; while(!(i>=48&&i<=57||i>=65&&i<=90||i>=97&&i<=122)){ i=(int) (Math.random()*128); } char c=(char) i; return c+""; } jsp页面img直接src指向这个servlet。。。。 声明:ITeye文章版权属于作者,受法律保护。没有作者书面许可不得转载。
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