本文實例為大家分享了java制作簡單驗證碼的具體代碼，供大家參考，具體內容如下
在這里我們需要用到java的畫筆工具，所以我們需要導入以下包
import="java.util.*,java.awt.*,java.awt.image.*,javax.imageio.*"
然后我就使用java腳本來實現一個小小的驗證碼
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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"%> <!-- 以上導入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>驗證碼</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> <%! //獲取隨機顏色 public Color getColor(){ Random random = new Random(); //使用rgb()隨機產生顏色 int r = random.nextInt(256); int g = random.nextInt(256); int b = random.nextInt(256); return new Color(r,g,b); } //獲取隨機數字 產生一個4位數 public String getNum(){ String str = ""; Random random = new Random(); for(int i = 0;i < 4;i++){ str += random.nextInt(10); //0-9 } return str; } %> <% /* 清除緩存 */ response.setHeader("pragma", "mo-cache"); response.setHeader("cache-control", "no-cache"); response.setDateHeader("expires", 0); //產生矩形框 BufferedImage image = new BufferedImage(80,30,BufferedImage.TYPE_INT_RGB); //獲取畫筆工具 Graphics g = image.getGraphics(); //設置矩形框的顏色 g.setColor(new Color(200,200,200)); //設置坐標和寬高 g.fillRect(0, 0, 80, 30); //隨機產生干擾線 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); //設置隨機顏色 g.setColor(getColor()); //畫出來 g.drawLine(x, y, x1, y1); } //字的顏色和數字 g.setFont(new Font("Microsoft YaHei",Font.BOLD,16)); g.setColor(Color.BLACK); //獲取隨機數字 String checkNum = getNum(); //給字拼接空格 StringBuffer sb = new StringBuffer(); for(int i = 0;i < checkNum.length();i++){ sb.append(checkNum.charAt(i) + " "); } //畫出數字 g.drawString(sb.toString(), 15, 20); //存入session域中 session.setAttribute("CHECKNUM", checkNum); //例如1010 //將圖像以jpeg的形式通過字節流輸出 ImageIO.write(image, "jpeg", response.getOutputStream()); //清除緩存 out.clear(); //放入body中 out = pageContext.pushBody(); %> </body> </html> |
結果如下：
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持服務器之家。
原文鏈接：http://blog.csdn.net/evan_qb/article/details/78473285
