java實(shí)現(xiàn)注銷功能-javaWeb注冊(cè)登陸注銷功能的實(shí)現(xiàn)

1、java_javaWeb注冊(cè)，登陸，注銷功能的實(shí)現(xiàn)：注冊(cè)頁(yè)：regist.jsp:pageEncoding=UTF-8%Insert title herefunction changeImg()document.getElementById(myImg).src=$pageContext.request.contextPath/servlet/CheckCodeServlet? +new Date().getTime();function validataForm()var username = document.getElementById(username).value;if(userna

2、me = )alert(戶名不能為空！);return false;var password = document.getElementById(password).value;if(password = )alert(密碼不能為空!);return false;var repassword = document.getElementById(repassword).value;if(password != repassword)alert(兩次密碼不致！);return false;var email = document.getElementById(email).value;if(ema

3、il.match(s*w+(?:.0,1w-+)*a-zA-Z0-9+(?:-.a-zA-Z0-9+)*.a-zA-Z+s*$)=null)alert(哥們,郵箱地址法);return false;確認(rèn)密碼：郵箱：nclick=changeImg(); style=cursor: pointer; id=myImg：.驗(yàn)證碼servlet：CheckCodeServlet.java完成頁(yè)顯驗(yàn)證碼的效果：package com.itcode.view;import java.awt.Color;import java.awt.Font;import java.awt.Graphics;impor

4、t java.awt.Graphics2D;import java.awt.image.BufferedImage;import java.io.IOException;import java.util.Random;import javax.imageio.ImageIO;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResp

5、onse;public class CheckCodeServlet extends HttpServlet / ctrl + shift +X 變寫 Yprivate final int WIDTH = 120;private final int HEIGHT = 30;public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException response.setHeader(cache-control, no-cache);respons

6、e.setHeader(pragma, no-cache);response.setDateHeader(expires, -1);/ 1.在內(nèi)存中構(gòu)建出張 圖BufferedImage image = new BufferedImage(WIDTH, HEIGHT, BufferedImage.TYPE_INT_RGB);Graphics2D graphics = (Graphics2D) image.getGraphics();/ 將 背景設(shè)置 為 .graphics.setColor(Color.WHITE);graphics.fillRect(0, 0,WIDTH,HEIGHT);/

7、狀態(tài)機(jī)/ 畫 矩形 . 之前 由于已經(jīng)設(shè)置 過 顏 ,就相當(dāng)于 維護(hù)了 個(gè)狀態(tài)機(jī),所以 你需要 再次調(diào) setCorlor , 否則 就看不到 你 畫 的矩形了 .graphics.setColor(Color.BLUE);graphics.drawRect(0, 0,WIDTH-1, HEIGHT-1);/ 準(zhǔn)備好 要 使的 漢字./String base =ABCDEFGHIJKLMNOPQRST;String base =u7684u4e00u4e86u662fu6211u4e0du5728u4ebau4eecu6709u6765u4ed6u8fd9u4e0au7740u4e2au573

8、0uRandom rand = new Random();/ 設(shè)置顏graphics.setColor(Color.RED);/ 設(shè)置 字體graphics.setFont(new Font(宋體,Font.BOLD,18);StringBuilder sb = new StringBuilder();int m =10;/ 在for循環(huán)中 將 漢字畫上去for (int i = 0;i 4;i+) int index = rand.nextInt(base.length();char charAt = base.charAt(index);/ -30 - 30int jiaodu = ran

9、d.nextInt(60) -30;double theta = jiaodu*Math.PI/180;graphics.rotate(theta, m,15);graphics.drawString(charAt +, m,20);sb.append(charAt);graphics.rotate(-theta, m,15);m+=25;/ 畫 4 條線graphics.setColor(Color.GREEN);for (int i = 0;i Insert title here$message 戶名：密碼：記住戶名與密碼六：LoginServlet,查看戶登陸時(shí)所填寫的信息是否與數(shù)據(jù)庫(kù)件

10、中的相應(yīng)數(shù)據(jù)符合，若符合，則顯登陸成功，若不符合，則請(qǐng)求轉(zhuǎn)發(fā)到登陸頁(yè)：package com.itcode.controller;import java.io.IOException;import java.lang.reflect.InvocationTargetException;import javax.servlet.ServletException;import javax.servlet.http.Cookie;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;imp

11、ort javax.servlet.http.HttpServletResponse;import mons.beanutils.BeanUtils;import com.itcode.model.User;import com.itcode.model.UserOperator;public class LoginServlet extends HttpServlet public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException U

12、ser user = new User();try BeanUtils.populate(user, request.getParameterMap(); catch (IllegalAccessException e) / TODO Auto-generated catch blocke.printStackTrace(); catch (InvocationTargetException e) / TODO Auto-generated catch blocke.printStackTrace();UserOperator userOperator = new UserOperator()

13、;User existUser = userOperator.login(user);if(existUser = null)response.getWriter().println(戶名或密碼不正確，請(qǐng)重新輸！);request.getRequestDispatcher(/login.jsp).forward(request, response);else/登陸成功后，跳轉(zhuǎn)到頁(yè)。在 頁(yè)要判斷戶是否已經(jīng)登陸request.getSession().setAttribute(existUser,existUser);if(on.equals(request.getParameter(rememb

14、er)/1.將戶名寫進(jìn)cookie/Cookie usernameCookie = new Cookie(username,request.getParameter(username);Cookie usernameCookie = new Cookie(username,existUser.getUsername();usernameCookie.setMaxAge(60*12);usernameCookie.setPath(/);response.addCookie(usernameCookie);System.out.println(22);/2.將密碼寫進(jìn)cookie/Cookie p

15、asswordCookie = new Cookie(password,request.getParameter(password);Cookie passwordCookie = new Cookie(password,existUser.getPassword();passwordCookie.setMaxAge(60*12);passwordCookie.setPath(/);response.addCookie(passwordCookie);System.out.println(44);response.sendRedirect(/user/index.jsp);public voi

16、d doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException doGet(request, response);七：注銷成功的實(shí)現(xiàn)：在登錄成功后的頁(yè)寫個(gè)注銷的超鏈接，鏈接到注銷Servlet，LogoutServlet.javapackage com.itcode.controller;import java.io.IOException;import javax.servlet.ServletException;import javax.servle

17、t.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class LogoutServlet extends HttpServlet public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException /request.getSession().removeAttribute(existUser);request.getSession().invalidate();response.getWriter().println(fuck you have logou