所用到的開發工具為myeclipse10，MySQL數據庫。
首先，在myeclipse中新建一個Java web項目。
項目的結構：
數據庫結構：
下面將各個包中的代碼粘貼出來。
com.ningmeng.dao包
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package com.ningmeng.dao;import java.sql.Connection;import java.sql.PreparedStatement;import java.sql.ResultSet;import java.sql.SQLException;import com.ningmeng.model.User;public class UserDao { public User login(Connection con,User user) throws SQLException{ User resultUser=null; String sql="select * from user where username=? and password=?"; PreparedStatement ps=con.prepareStatement(sql);// ps.setString(1, user.getUsername()); ps.setString(2, user.getPassword()); ResultSet rs=ps.executeQuery(); if(rs.next()){ resultUser=new User(); resultUser.setUsername(rs.getString("username")); resultUser.setPassword(rs.getString("password")); } return resultUser; }} |
com.ningmeng.model包
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package com.ningmeng.model;public class User { private int id; private String username; private String password; public User() { super(); } public User(String username, String password) { super(); this.username = username; this.password = password; } public int getId() { return id; } public void setId(int id) { this.id = id; } public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; }} |
com.ningmeng.util包
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package com.ningmeng.util;import java.sql.Connection;import java.sql.DriverManager;import java.sql.SQLException; public class DbUtil { private String url="jdbc:mysql://localhost:3306/db-jsp"; private String user="root"; private String password="123"; private String driver="com.mysql.jdbc.Driver"; public Connection getCon() throws Exception{ Class.forName(driver); Connection con=DriverManager.getConnection(url, user, password); return con; } public static void getClose(Connection con) throws SQLException{ if(con!=null){ con.close(); } } /*public static void main(String[] args) { DbUtil db=new DbUtil(); try { db.getCon(); System.out.println("測試連接數據庫，連接成功"); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); System.out.println("測試連接數據庫，連接失敗"); } }*/} |
com.ningmeng.web包
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package com.ningmeng.web;import java.io.IOException;import java.sql.Connection;import java.io.*;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession;import javax.servlet.http.*;import com.ningmeng.dao.UserDao;import com.ningmeng.model.User;import com.ningmeng.util.DbUtil;public class LoginServlet extends HttpServlet{ DbUtil db=new DbUtil(); UserDao userDao=new UserDao(); /** * */ private static final long serialVersionUID = 1L; @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doPost(request, response); } @Override protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String username=request.getParameter("username"); String password=request.getParameter("password"); String checkcode=request.getParameter("checkCode"); HttpSession session=request.getSession(); //session.getAttribute("randCheckCode"); String s = (String)session.getAttribute("randCheckCode"); if(!checkcode.equals(s)) { response.sendRedirect("linmao.jsp"); }else{ if(request.getParameter("ra").equals("l")){ Connection con=null; try { User user=new User(username,password); con=db.getCon(); User currentUser=userDao.login(con, user); if(currentUser==null){ //System.out.println("no"); request.setAttribute("error", "用戶名或者密碼錯誤"); request.setAttribute("username", username); request.setAttribute("password", password); request.getRequestDispatcher("login.jsp").forward(request, response); }else{ //System.out.println("yes"); HttpSession session1=request.getSession(); session1.setAttribute("currentUser",currentUser); response.sendRedirect("main.jsp"); } } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } else{ response.sendRedirect("linmao.jsp"); } } } } |
com.servlet包
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package com.servlet;import java.awt.*;import java.awt.geom.*;import java.awt.image.*;import java.io.*;import java.util.*;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession;import javax.imageio.ImageIO;public class PictureCheckCode extends HttpServlet { private static final long serialVersionUID = 1L; public PictureCheckCode() { super(); } public void destroy() { super.destroy(); } public void init() throws ServletException { super.init(); } /*該方法主要作用是獲得隨機生成的顏色*/ public Color getRandColor(int s,int e){ Random random=new Random (); if(s>255) s=255; if(e>255) e=255; int r,g,b; r=s+random.nextInt(e-s); //隨機生成RGB顏色中的r值 g=s+random.nextInt(e-s); //隨機生成RGB顏色中的g值 b=s+random.nextInt(e-s); //隨機生成RGB顏色中的b值 return new Color(r,g,b); } @Override public void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //設置不緩存圖片 response.setHeader("Pragma", "No-cache"); response.setHeader("Cache-Control", "No-cache"); response.setDateHeader("Expires", 0); //指定生成的響應圖片,一定不能缺少這句話,否則錯誤. response.setContentType("image/jpeg"); int width=86,height=33; //指定生成驗證碼的寬度和高度 BufferedImage image=new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB); //創建BufferedImage對象,其作用相當于一圖片 Graphics g=image.getGraphics(); //創建Graphics對象,其作用相當于畫筆 Graphics2D g2d=(Graphics2D)g; //創建Grapchics2D對象 Random random=new Random(); Font mfont=new Font("楷體",Font.BOLD,20); //定義字體樣式 g.setColor(getRandColor(200,250)); g.fillRect(0, 0, width, height); //繪制背景 g.setFont(mfont); //設置字體 g.setColor(getRandColor(180,200)); //繪制100條顏色和位置全部為隨機產生的線條,該線條為2f for(int i=0;i<100;i++){ int x=random.nextInt(width-1); int y=random.nextInt(height-1); int x1=random.nextInt(6)+1; int y1=random.nextInt(12)+1; BasicStroke bs=new BasicStroke(2f,BasicStroke.CAP_BUTT,BasicStroke.JOIN_BEVEL); //定制線條樣式 Line2D line=new Line2D.Double(x,y,x+x1,y+y1); g2d.setStroke(bs); g2d.draw(line); //繪制直線 } //輸出由英文，數字，和中文隨機組成的驗證文字，具體的組合方式根據生成隨機數確定。 String sRand=""; String ctmp=""; int itmp=0; //制定輸出的驗證碼為四位 for(int i=0;i<4;i++){ switch(random.nextInt(3)){ case 1: //生成A-Z的字母 itmp=random.nextInt(26)+65; ctmp=String.valueOf((char)itmp); break; default: itmp=random.nextInt(10)+48; ctmp=String.valueOf((char)itmp); break; } sRand+=ctmp; Color color=new Color(20+random.nextInt(110),20+random.nextInt(110),random.nextInt(110)); g.setColor(color); //將生成的隨機數進行隨機縮放并旋轉制定角度 PS.建議不要對文字進行縮放與旋轉,因為這樣圖片可能不正常顯示 /*將文字旋轉制定角度*/ Graphics2D g2d_word=(Graphics2D)g; AffineTransform trans=new AffineTransform(); trans.rotate((45)*3.14/180,15*i+8,7); /*縮放文字*/ float scaleSize=random.nextFloat()+0.8f; if(scaleSize>1f) scaleSize=1f; trans.scale(scaleSize, scaleSize); g2d_word.setTransform(trans); g.drawString(ctmp, 15*i+18, 14); } HttpSession session=request.getSession(true); session.setAttribute("randCheckCode", sRand); g.dispose(); //釋放g所占用的系統資源 ImageIO.write(image,"JPEG",response.getOutputStream()); //輸出圖片 }} |
配置web.xml
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<?xml version="1.0" encoding="UTF-8"?><web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0"> <display-name>web04</display-name> <welcome-file-list> <welcome-file>login.jsp</welcome-file> <welcome-file>main.jsp</welcome-file> </welcome-file-list> <servlet> <servlet-name>LoginServlet</servlet-name> <servlet-class>com.ningmeng.web.LoginServlet</servlet-class> </servlet> <servlet> <description>輸出驗證碼</description> <display-name>This is the display name of my J2EE component</display-name> <servlet-name>PictureCheckCode</servlet-name> <servlet-class>com.servlet.PictureCheckCode</servlet-class> </servlet> <servlet-mapping> <servlet-name>LoginServlet</servlet-name> <url-pattern>/login</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>PictureCheckCode</servlet-name> <url-pattern>/PictureCheckCode</url-pattern> </servlet-mapping></web-app> |
login.jsp:
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<%@ 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><script language="javascript">function myReload() { document.getElementById("CreateCheckCode").src = document .getElementById("CreateCheckCode").src + "?nocache=" + new Date().getTime();}</script></head><body><form action="login" method="post"> <table> <tr> <th colspan="2">登錄界面</th> </tr> <tr> <td>賬號：</td> <td><input type="text" id="username" name="username" value="${username}"></td> </tr> <tr> <td>密碼：</td> <td><input type="password" id="password" name="password" value="${password}"></td> </tr> <tr> <td>驗證碼：</td> <td><input name="checkCode" type="text" id="checkCode" title="驗證碼區分大小寫" size="8" ,maxlength="4" /> <img src="PictureCheckCode" id="CreateCheckCode" align="middle"> <a href="" onclick=" rel="external nofollow" myReload()"> 看不清,換一個</a> </tr> <tr> <td>類型：</td> <td> <input type="radio" name="ra" value="l" checked="checked"/>一般研究人員 <input type="radio" name="ra" value="m" />管理員研究人員 </td> </tr> <tr> <td> <input type="submit" value="提交"> <font color="red">${error}</font> </td> </tr> </table></form></body></html> |
main.jsp:
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<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Insert title here</title></head><body><p>登錄成功</p>當前用戶：${currentUser.username}<br/>當前密碼：${currentUser.password}<br/></body></html> |
linmao.jsp:
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<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%><%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>My JSP 'linmao.jsp' starting page</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"> <!-- <link rel="stylesheet" type="text/css" href="styles.css" rel="external nofollow" > --> </head> <body> This is my JSP page. <br> </body></html> |
項目現在做到驗證碼和權限這一塊，找回密碼功能還沒有做完，結構中Check.jsp還用不到。還有連接數據庫的操作，就不詳細敘述了。
賬號和密碼在數據庫的表中
以上所述是小編給大家介紹的Java web含驗證碼及權限登錄實例代碼，希望對大家有所幫助，如果大家有任何疑問請給我留言，小編會及時回復大家的。在此也非常感謝大家對服務器之家網站的支持！
