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目錄
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DBConn.java
package org.db; import java.sql.*; public class DBConn { public static Connection conn;//創建Connection連接對象conn //已獲取數據庫連接 public static Connection getConn(){ try{ Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");//Class.forName方法加載註冊SQL Server 2014的JDBC驅動 conn=DriverManager.getConnection("jdbc:sqlserver://localhost:1433;databaseName=MBOOK","sa","5678");//編寫連接字符串conn,創建獲取連接 return conn; }catch(Exception e){ e.printStackTrace(); return null; } } public static void CloseConn(){ try{ conn.close();//自帶函數關閉連接 }catch(Exception e){ e.printStackTrace(); } } } -
login.jsp
<%@page lanuage="java" pageEncoding="gb2312"%> <html> <head> <title>圖書管理系統</title></head> <body bgcolor="#71CABC"> <form action="longinServlet" method="post"> <table> <caption>用戶登錄</caption> <tr> <td>登錄名</td> <td><input name="name" type="text" size="22"/></td> </tr> <tr> <td>密碼</td> <td><input name="password" type="password" size="22"/></td> </tr></table> <input type="submit" value="登錄"/> <input type="reset" value="重置"/> </form></body></html> -
main.jsp
<%@ page language="java" pageEncoding="gb2312" import="org.model.Login" %> <html> <head> <title>歡迎使用</title> </head> <body> <% Login login=(Login)session.getAttribute("login"); //從會話中取出 Login 對象 String lgn=login.getName(); //通過 JavaBean 對象獲取用戶名 %> <%=lgn%>，您好！歡迎使用圖書管理系統。 </body> </html> -
error.jsp
<%@ page language="java" pageEncoding="gb2312"%> <html> <head> <title>出錯</title> </head> <body> 登錄失敗！單擊<a href="login.jsp">這裏</a>返回 </body> </html> -
LoginServlet.java
/** * */ /** * @author 123 * */ package org.servlet; import java.io.*; import javax.servlet.*; import javax.servlet.http.*; import org.model.*; import org.dao.*; public class LoginServlet extends HttpServlet{ public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException{ request.setCharacterEncoding("gb2312"); LoginDao loginDao = new LoginDao(); Login l= loginDao.checkLogin(request.getParameter("name"),request.getParameter("password")); if(l!=null){ HttpSession session=request.getSession(); session.setAttribute("login", 1); response.sendRedirect("main.jsp"); }else{ response.sendRedirect("error.jsp"); } } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException{ doGet(request,response); } } -
web.xml
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1"> <servlet> <servlet-name>loginServlet</servlet-name> <servlet-class>org.servlet.LoginServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>loginServlet</servlet-name> <url-pattern>/loginServlet</url-pattern> </servlet-mapping> </web-app> -
Login.java
/** * */ /** * @author 123 * */ package org.model; public class Login{ private Integer id; private String name; private String password; private boolean role; public Integer getId(){ return this.id; } public void setId(Integer id){ this.id=id; } public String getName(){ return this.name; } public void setName(String name){ this.name=name; } public String getPassword(){ return this.password; } public void setPassword(String password){ this.password=password; } public boolean getRole(){ return this.role; } public void setRole(boolean role){ this.role=role; } } -
LoginDao.java
package org.dao; import java.sql.*; import org.model.*; import org.db.*; public class LoginDao{ Connection conn; public Login checkLogin(String name, String password){ try{ conn=DBConn.getConn(); PreparedStatement pstmt = conn.prepareStatement("select * from [login] where name=?"+"and password=?"); pstmt.setString(1, name); pstmt.setString(2, password); ResultSet rs=pstmt.executeQuery(); if(rs.next()){ Login login=new Login(); login.setId(rs.getInt(1)); login.setName(rs.getString(2));//怎麼分清這兩個方法呢？ login.setPassword(rs.getString(3)); login.setRole(rs.getBoolean(4)); return login; } return null; }catch(Exception e){ e.printStackTrace(); return null; }finally{ DBConn.CloseConn(); } } }
採用JSP+Servlet+JavaBean+JDBC方式開發一個Web登錄程序
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