使用技术 jQuery druid MySQL Jackson AJAX JSON
话不多说直接上代码
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–JSP页面
<%--
Created by IntelliJ IDEA.
User: QiLin
Date: 2020/7/28
Time: 13:55
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
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Servlet—登录
package web;
import service.UserService;
import service.impl.UserServiceImpl;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.*;
import java.io.IOException;
import java.net.URL;
import java.net.URLEncoder;
/**
* @author: QiLin
* @date: 2020/8/1 14:32
* @version: 1.0
*/
@WebServlet( "/Login")
public class Login extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
String user = request.getParameter("user");
String pwd = request.getParameter("password");
String code = request.getParameter("verifycode");
String jzmm = request.getParameter("cookie");
String check_card = (String) request.getSession().getAttribute("check_card");
HttpSession session = request.getSession();
if (code.equalsIgnoreCase(check_card)) {
UserService userService = new UserServiceImpl();
int login = userService.login(user, pwd);
if (login == 1) {
if ( jzmm !=null && jzmm.equals("true") ) {
String username = URLEncoder.encode(user,"UTF-8");
String userpwd = URLEncoder.encode(user+"pwd","UTF-8");
Cookie name = new Cookie(username,username);
Cookie pwdpwd = new Cookie(userpwd,pwd);
Cookie jzmmm = new Cookie("jzmm",jzmm);
name.setMaxAge(1*60*60);
pwdpwd.setMaxAge(1*60*60);
jzmmm.setMaxAge(1*60*60);
session.setAttribute("username", user);
session.setAttribute("password", pwd);
response.addCookie(name);
response.addCookie(pwdpwd);
response.addCookie(jzmmm);
request.setAttribute("user",user);
request.getRequestDispatcher("index.jsp").forward(request,response);
} else {
request.setAttribute("user",user);
request.getRequestDispatcher("index.jsp").forward(request,response);
}
} else {
session.removeAttribute("msg1");
session.setAttribute("msg2","用户名或密码错误");
response.sendRedirect("login.jsp");
}
} else {
session.removeAttribute("msg2");
session.setAttribute("msg1","验证码错误");
response.sendRedirect("login.jsp");
}
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doPost(request, response);
}
}Servlet—获取密码
package web;
import com.fasterxml.jackson.databind.ObjectMapper;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.*;
import java.io.IOException;
import java.net.URLDecoder;
import java.net.URLEncoder;
/**
* @author: QiLin
* @date: 2020/8/2 14:09
* @version: 1.0
*/
@WebServlet( "/GetCookie")
public class GetCookie extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/html;charset=utf-8");
String user = request.getParameter("uname");
String password = "";
ObjectMapper mapper = new ObjectMapper();
// 获取cookie
Cookie[] cookies = request.getCookies();
// 如果为空，则停留在该页面
if(cookies !=null || cookies.length >0) {
String username = URLEncoder.encode(user,"UTF-8");
String userpwd = URLEncoder.encode(user+"pwd","UTF-8");
for (int i = 0; i < cookies.length; i++) {
if (cookies[i].getName().equals(username)) {
user = URLDecoder.decode(cookies[i].getValue(),"UTF-8");
}
if (cookies[i].getName().equals(userpwd)) {
password = cookies[i].getValue();
}
}
request.setAttribute("pwd",password);
String pwd = mapper.writeValueAsString(request.getAttribute("pwd"));
response.getWriter().write(pwd);
}
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doPost(request, response);
}
}
Servlet—验证码
package web;
import javax.imageio.ImageIO;
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 java.awt.*;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.Random;
/**
* @author: QiLin
* @date: 2020/8/1 13:52
* @version: 1.0
*/
@WebServlet( "/Check_card")
public class Check_card extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//设置宽高
int width = 100;
int height = 50;
//创建对象，在内存验证码图
BufferedImage image = new BufferedImage(width,height,BufferedImage.TYPE_INT_BGR);
//美化图片
Graphics graphics = image.getGraphics();
//画边框
graphics.setColor(Color.magenta);
graphics.drawRect(0,0,width-1,height-1);
//填充背景颜色
graphics.setColor(Color.cyan);//画笔颜色
graphics.drawRect(0,0,width,height);
//定义随机抽取池
String str = "QWERTYUIOPASDFGHJKLZXCVBNMqwertyuioplkjhgfdsazxcvbnm0123456789";
//生成随机角标
Random ran = new Random();
//接收验证码
StringBuffer sb = new StringBuffer();
//写入验证码
for (int i = 1; i <= 4; i++) {
int index = ran.nextInt(str.length());
//获取随机字符
char c = str.charAt(index);
sb.append(c);
// //生成随机x轴
// int x = ran.nextInt(width-10) % (width-10-10+1)+10;
// //生成随机y轴
// int y = ran.nextInt(height-5) % (width-5-5+1)+5;
graphics.setFont(new Font("Tahoma", Font.BOLD, 18));
graphics.drawString(c+"",width/5*i,height/2);
}
//存入session
String session_check = sb.toString();
request.getSession().setAttribute("check_card",session_check);
//画干扰线
graphics.setColor(Color.green);
for (int i = 0; i < 10; i++) {
int x1 = ran.nextInt(width);
int x2 = ran.nextInt(width);
int y1 = ran.nextInt(height);
int y2 = ran.nextInt(height);
graphics.drawLine(x1,y1,x2,y2);
}
//将图片画到页面
ImageIO.write(image,"jpg",response.getOutputStream());
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doPost(request, response);
}
}