本文实例为大家分享了java制作简单验证码的具体代码，供大家参考，具体内容如下
在这里我们需要用到java的画笔工具，所以我们需要导入以下包
import="java.util.*,java.awt.*,java.awt.image.*,javax.imageio.*"
然后我就使用java脚本来实现一个小小的验证码
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<%@ page contentType="image/jpeg; charset=utf-8" language="java" import="java.util.*,java.awt.*,java.awt.image.*,javax.imageio.*" pageEncoding="UTF-8"%> <!-- 以上导入awt和awt.image包 --><% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <base href="<%=basePath%>" rel="external nofollow" > <title>验证码</title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="This is my page"> </head> <body> <%! //获取随机颜色 public Color getColor(){ Random random = new Random(); //使用rgb()随机产生颜色 int r = random.nextInt(256); int g = random.nextInt(256); int b = random.nextInt(256); return new Color(r,g,b); } //获取随机数字 产生一个4位数 public String getNum(){ String str = ""; Random random = new Random(); for(int i = 0;i < 4;i++){ str += random.nextInt(10); //0-9 } return str; } %> <% /* 清除缓存 */ response.setHeader("pragma", "mo-cache"); response.setHeader("cache-control", "no-cache"); response.setDateHeader("expires", 0); //产生矩形框 BufferedImage image = new BufferedImage(80,30,BufferedImage.TYPE_INT_RGB); //获取画笔工具 Graphics g = image.getGraphics(); //设置矩形框的颜色 g.setColor(new Color(200,200,200)); //设置坐标和宽高 g.fillRect(0, 0, 80, 30); //随机产生干扰线 for(int i = 0;i < 30;i++){ Random random = new Random(); int x = random.nextInt(80); int y = random.nextInt(30); int x1 = random.nextInt(x + 10); int y1 = random.nextInt(y + 10); //设置随机颜色 g.setColor(getColor()); //画出来 g.drawLine(x, y, x1, y1); } //字的颜色和数字 g.setFont(new Font("Microsoft YaHei",Font.BOLD,16)); g.setColor(Color.BLACK); //获取随机数字 String checkNum = getNum(); //给字拼接空格 StringBuffer sb = new StringBuffer(); for(int i = 0;i < checkNum.length();i++){ sb.append(checkNum.charAt(i) + " "); } //画出数字 g.drawString(sb.toString(), 15, 20); //存入session域中 session.setAttribute("CHECKNUM", checkNum); //例如1010 //将图像以jpeg的形式通过字节流输出 ImageIO.write(image, "jpeg", response.getOutputStream()); //清除缓存 out.clear(); //放入body中 out = pageContext.pushBody(); %> </body> </html> |
结果如下：
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：http://blog.csdn.net/evan_qb/article/details/78473285
