Demo_JSP of architecture instance, demo_jsp
Demo_JSP of architecture instance
1,Development tools and development environment
Development tools: MyEclipse10, JDK1.6.0 _ 13 (32-bit), Tomcat7.0 (32-bit), and mysql5.7.13
Development Environment: WIN10
2,Demo_JSP implementation function
User Logon, user registration, and logout.
3,Demo_JSP Usage Technology
This example uses JSP and JDBC to Implement User Logon, user registration, and logout. Figure 1 shows the system architecture:
Figure 1: Demo_JSP System Architecture
See figure 2 (Logical Relationship Diagram between JSP files in Demo_JSP ):
Figure 2: Logical Relationship Between JSP files in Demo_JSP
4,Implementation
(1) create a new Web project in MyEclipse and name it Demo_JSP;
(2) Import mysql-connector-java-5.1.6-bin.jar to Demo_JSP project, this package is to achieve Java Connection database function package (will not import the package of students, can Baidu yo );
Attachment: mysql-connector-java-5.1.6-bin.jar, Baidu cloud download link: http://pan.baidu.com/s/1i5psdDF password: meyg
(3) create the following JSP file in the Demo_JSP project:
1) login. jsp: The homepage page for user logon. The Code is as follows:
<% @ Page language = "java" import = "java. util. * "pageEncoding =" UTF-8 "%> <% String path = request. getContextPath (); String basePath = request. getScheme () + ": //" + request. getServerName () + ":" + request. getServerPort () + path + "/"; %> <! Doctype html public "-// W3C // dtd html 4.01 Transitional // EN">
2) login_action.jsp receives the username and password entered by the user on the login. jsp page and implements logon authentication through JDBC. The specific code is as follows:
<%@ page language="java" import="java.util.*,java.sql.*" pageEncoding="UTF-8"%><%@ include file="inc.jsp"%><%//get parametersString username = request.getParameter("username");String password = request.getParameter("password");//check nullif (username == null || password == null) { response.sendRedirect("login.jsp");}//validateboolean isValid = false;String sql = "select * from userInfo where username='"+username+"' and password='"+password+"'";try { Class.forName(drv).newInstance(); Connection conn = DriverManager.getConnection(url, usr, pwd); Statement stm = conn.createStatement(); ResultSet rs = stm.executeQuery(sql); if(rs.next())isValid = true; rs.close(); stm.close(); conn.close();} catch (Exception e) { e.printStackTrace(); out.println(e);} finally {}if (isValid) { session.setAttribute("username", username); response.sendRedirect("welcome.jsp");} else { response.sendRedirect("login.jsp");}%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 3) inc. jsp, which stores the database connection address. The specific code is as follows:
<%@ page language="java" import="java.util.*,java.sql.*" pageEncoding="UTF-8"%><%String drv = "com.mysql.jdbc.Driver";String url = "jdbc:mysql://localhost:3306/library_system";String usr = "root";String pwd = "root";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
4) welcome. jsp: the main interface after successful logon. The Code is as follows:
<% @ Page language = "java" import = "java. util. * "pageEncoding =" UTF-8 "%> <% String path = request. getContextPath (); String basePath = request. getScheme () + ": //" + request. getServerName () + ":" + request. getServerPort () + path + "/"; %> <! Doctype html public "-// W3C // dtd html 4.01 Transitional // EN">
5) loginout. jsp: log out and return to the logon page. The Code is as follows:
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%session.removeAttribute("username");response.sendRedirect("login.jsp");%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 6) register. jsp implements the user registration interface. The specific code is as follows:
<% @ Page language = "java" import = "java. util. * "pageEncoding =" UTF-8 "%> <% String path = request. getContextPath (); String basePath = request. getScheme () + ": //" + request. getServerName () + ":" + request. getServerPort () + path + "/"; %> <! Doctype html public "-// W3C // dtd html 4.01 Transitional // EN">
7) register_action.jsp, implements registration through JDBC, and writes data to the database. The specific code is as follows:
<%@ include file="inc.jsp"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><%//get parametersString username = request.getParameter("username");String password1 = request.getParameter("password1");String password2 = request.getParameter("password2");String email = request.getParameter("email");//check nullif (username == null || password1 == null || password2 == null || !password1.equals(password2)) { response.sendRedirect("register.jsp");}//validateboolean isValid = false;String sql = "select * from userInfo where username='"+username+"'";try { Class.forName(drv).newInstance(); Connection conn = DriverManager.getConnection(url, usr, pwd); Statement stm = conn.createStatement(); ResultSet rs = stm.executeQuery(sql); if(!rs.next()) { sql = "insert into userInfo(username,password,mail) values('"+username+"','"+password1+"','"+email+"')"; stm.execute(sql); isValid = true; } rs.close(); stm.close(); conn.close();} catch (Exception e) { e.printStackTrace(); out.println(e);}if (isValid) { response.sendRedirect("login.jsp");} else { response.sendRedirect("register.jsp");}%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 5,Running result display
(1) Enter http: // localhost: 8080/Demo_JSP/login. jsp in the browser, as shown in Figure 3:
Figure 3: logon page
(2) Click register a new user, as shown in figure 4:
Figure 4: registration page
(3) After successful registration, the system will automatically return to the logon page, enter the user name and password, and click logon, as shown in Figure 5:
Figure 5: welcome. jsp page after Logon
Attachment: Demo_JSP project source code Baidu cloud download link: http://pan.baidu.com/s/1mifI8nI password: j3wp; this instance uses the database to Create Table SQL statement File Download link: http://pan.baidu.com/s/1eS0n9aM password: 7ttd
Start building with 50+ products and up to 12 months usage for Elastic Compute Service
1 on 1 presale consultation
24/7 Technical Support 6 Free Tickets per Quarter Faster Response
Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.
A comprehensive suite of global cloud computing services to power your business
Payment Methods We Support
