code.jsp
- Java code
<%@ page import="java.awt.*,java.awt.image.*,java.util.*,javax.imageio.*"%> <%@ page import="java.io.OutputStream"%> <%@ page pageEncoding="UTF-8"%> <%!Color getRandColor(int fc, int bc) { Random random = new Random(); if (fc > 255) fc = 255; if (bc > 255) bc = 255; int r = fc + random.nextInt(bc - fc); int g = fc + random.nextInt(bc - fc); int b = fc + random.nextInt(bc - fc); return new Color(r, g, b); }%> <% try { response.setHeader("Pragma", "No-cache"); response.setHeader("Cache-Control", "no-cache"); response.setDateHeader("Expires", 0); int width = 70, height = 20; BufferedImage image = new BufferedImage(width, height,BufferedImage.TYPE_INT_RGB); OutputStream os = response.getOutputStream(); Graphics g = image.getGraphics(); Random random = new Random(); //设置背景和大小 g.setColor(getRandColor(200, 250)); g.fillRect(0, 0, width, height); //设置字体和颜色 g.setFont(new Font("Times New Roman", Font.BOLD, 20)); g.setColor(getRandColor(120, 200)); for (int i = 0; i < 50; i++) { int x = random.nextInt(width); int y = random.nextInt(height); int xl = random.nextInt(5); int yl = random.nextInt(5); g.drawLine(x, y, x + xl, y + yl); } String sRand = ""; for (int i = 0; i < 4; i++) { String chose="0123456789"; String rand = String.valueOf(chose.charAt(random.nextInt(chose.length()))); sRand += rand; g.setColor(new Color(20 + random.nextInt(110), 20 + random.nextInt(110), 20 + random.nextInt(110))); g.drawString(rand, 15 * i + 6, 16); } session.setAttribute("rand", new String(sRand)); g.dispose(); g=null; ImageIO.write(image, "JPEG", os); os.flush(); os.close(); os = null; response.flushBuffer(); out.clear(); out = pageContext.pushBody(); } catch (IllegalStateException e) { System.out.println(e.getMessage()); e.printStackTrace(); } %>login.jsp
- HTML code
<form id="form1" name="form1" method="post" action="../function/checklogin.jsp" class="login_form"> <table width="200" border="0" cellspacing="0" cellpadding="0"> <tr> <td align="right">用户名</td> <td colspan="2"><input name="txtusername" type="text" class="login_input01" id="txtusername" /></td> </tr> <tr> <td align="right">密 码</td> <td colspan="2"><input name="txtpassword" type="password" class="login_input01" id="txtpassword" /></td> </tr> <tr> <td align="right">验证码</td> <td><input name="logincode" type="text" class="login_input01" id="logincode" style="width:50px;" maxlength="4" /></td> <td><a href="javascript:fRefCoder();"><img id="getImg" src="../function/code.jsp" height="20" width="70" border="0"></a></td> </tr> <tr> <td align="right"> </td> <td colspan="2" style="padding-top:7px;"><input name="imageField" type="image" src="../images/028.gif" style="float:left;"/><span class="rc_pw"><a href="../user/forgotpassword.jsp">取回密码</a></span></td> </tr> </table> </form>