<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8" %> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>Insert title here</title> <style type="text/css"> body{ background-color: azure; } form{ position: fixed; top: 250px; left: 650px; background-color: #ADD8E6; border-radius: 5px; } div{ font-size: 22px; margin-top: 20px; padding-left: 40px; } input{ 200px; height: 20px; border-radius: 5px; } #tj{ 80px; height: 30px; margin-left: 140px; border-radius: 5px; font-size: 16px; margin-bottom: 20px; } </style> </head> <body> <form action="/school/panduanServlet" method="post"> <div>账 号: <input type="text" name="username"></div> <div>密 码: <input type="text" name="password"></div> <div>验 证 码:<input type="text" name = "yanzhengma"> <img src="getcode" alt="看不清，换一张" onclick="change(this)"/></div> <div><input type="submit" id="tj" value="登录" ></div> </form> </body> <script type="text/javascript"> function change(img) { img.src = "getcode?"+new Date().getTime(); } </script> </html>
<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>Insert title here</title> </head> <body> <% String username = (String)request.getAttribute("username"); %> <%=username %>欢迎您 </body> </ht
package servlet; import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; /** * Servlet implementation class pandunServlet */ @WebServlet("/panduanServlet") public class panduanServlet extends HttpServlet { private static final long serialVersionUID = 1L; /** * @see HttpServlet#HttpServlet() */ public panduanServlet() { super(); // TODO Auto-generated constructor stub } /** * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) */ protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub request.setCharacterEncoding("UTF-8"); response.setContentType("text/html;charset=utf-8"); response.setCharacterEncoding("UTF-8"); HttpSession session = request.getSession(); String yanzhengma = session.getAttribute("code").toString(); System.out.println(yanzhengma); String username = request.getParameter("username"); String password = request.getParameter("password"); String yanzhengma1 = request.getParameter("yanzhengma"); if(yanzhengma.equals(yanzhengma1)) { if("zs".equals(username) && "123".equals(password)) { request.setAttribute("username", username); request.getRequestDispatcher("/success.jsp").forward(request, response); }else { request.getRequestDispatcher("/loginyanzheng.jsp").forward(request, response); } }else { request.getRequestDispatcher("/loginyanzheng.jsp").forward(request, response); } } /** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) */ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub doGet(request, response); } }
package servlet; import java.awt.image.RenderedImage; import java.io.IOException; import java.util.Map; import javax.imageio.ImageIO; import javax.servlet.ServletException; import javax.servlet.ServletOutputStream; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import utils.CodeUtil; /** * Servlet implementation class CodeServlet */ @WebServlet("/getcode") public class CodeServlet extends HttpServlet { private static final long serialVersionUID = 1L; /** * @see HttpServlet#HttpServlet() */ public CodeServlet() { super(); // TODO Auto-generated constructor stub } /** * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) */ protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // 调用工具类生成的验证码和验证码图片 Map<String, Object> codeMap = CodeUtil.generateCodeAndPic(); // 将四位数字的验证码保存到Session中。 HttpSession session = request.getSession(); session.setAttribute("code", codeMap.get("code").toString()); System.out.println( codeMap.get("code").toString()); // 禁止图像缓存。 response.setHeader("Pragma", "no-cache"); response.setHeader("Cache-Control", "no-cache"); response.setDateHeader("Expires", -1); response.setContentType("image/jpeg"); // 将图像输出到Servlet输出流中。 ServletOutputStream sos; try { sos = response.getOutputStream(); ImageIO.write((RenderedImage) codeMap.get("codePic"), "jpeg", sos); sos.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } /** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) */ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub doGet(request, response); } }
package utils; import java.awt.Color; import java.awt.Font; import java.awt.Graphics; import java.awt.image.BufferedImage; import java.awt.image.RenderedImage; import java.io.FileOutputStream; import java.io.OutputStream; import java.util.HashMap; import java.util.Map; import java.util.Random; import javax.imageio.ImageIO; public class CodeUtil { private static int width = 90;// 定义图片的width private static int height = 20;// 定义图片的height private static int codeCount = 4;// 定义图片上显示验证码的个数 private static int xx = 15; private static int fontHeight = 18; private static int codeY = 16; private static char[] codeSequence = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9' }; /** * 生成一个map集合 * code为生成的验证码 * codePic为生成的验证码BufferedImage对象 * @return */ public static Map<String,Object> generateCodeAndPic() { // 定义图像buffer BufferedImage buffImg = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); // Graphics2D gd = buffImg.createGraphics(); // Graphics2D gd = (Graphics2D) buffImg.getGraphics(); Graphics gd = buffImg.getGraphics(); // 创建一个随机数生成器类 Random random = new Random(); // 将图像填充为白色 gd.setColor(Color.WHITE); gd.fillRect(0, 0, width, height); // 创建字体，字体的大小应该根据图片的高度来定。 Font font = new Font("Fixedsys", Font.BOLD, fontHeight); // 设置字体。 gd.setFont(font); // 画边框。 gd.setColor(Color.BLACK); gd.drawRect(0, 0, width - 1, height - 1); // 随机产生40条干扰线，使图象中的认证码不易被其它程序探测到。 gd.setColor(Color.BLACK); for (int i = 0; i < 30; i++) { int x = random.nextInt(width); int y = random.nextInt(height); int xl = random.nextInt(12); int yl = random.nextInt(12); gd.drawLine(x, y, x + xl, y + yl); } // randomCode用于保存随机产生的验证码，以便用户登录后进行验证。 StringBuffer randomCode = new StringBuffer(); int red = 0, green = 0, blue = 0; // 随机产生codeCount数字的验证码。 for (int i = 0; i < codeCount; i++) { // 得到随机产生的验证码数字。 String code = String.valueOf(codeSequence[random.nextInt(36)]); // 产生随机的颜色分量来构造颜色值，这样输出的每位数字的颜色值都将不同。 red = random.nextInt(255); green = random.nextInt(255); blue = random.nextInt(255); // 用随机产生的颜色将验证码绘制到图像中。 gd.setColor(new Color(red, green, blue)); gd.drawString(code, (i + 1) * xx, codeY); // 将产生的四个随机数组合在一起。 randomCode.append(code); } Map<String,Object> map =new HashMap<String,Object>(); //存放验证码 map.put("code", randomCode); //存放生成的验证码BufferedImage对象 map.put("codePic", buffImg); return map; } }