登录和注册(jsp+servlet+JavaBean)

来源：互联网发布：学中医的软件编辑：程序博客网时间：2024/05/17 08:44

一：示例

//model层(Student.java)

Java代码  
package com.model;  
  
public class Student {  
    private int id;  
    private String userName;  
    private String userPwd;  
  
    public Student(int id, String userName, String userPwd) {  
        super();  
        this.id = id;  
        this.userName = userName;  
        this.userPwd = userPwd;  
    }  
      
    public Student(String userName, String userPwd) {  
        super();  
        this.userName = userName;  
        this.userPwd = userPwd;  
    }  
  
    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 getUserPwd() {  
        return userPwd;  
    }  
  
    public void setUserPwd(String userPwd) {  
        this.userPwd = userPwd;  
    }  
}  

//dao层(DbManager.java)

用数据源连接数据库，注意要将数据库驱动包添加到Tomcat ，lib目录下。

Java代码  
package com.dao;  
  
import java.sql.Connection;  
import java.sql.PreparedStatement;  
import java.sql.ResultSet;  
import java.sql.SQLException;  
import javax.naming.Context;  
import javax.naming.InitialContext;  
import javax.naming.NamingException;  
import javax.sql.DataSource;  
  
public class DbManager {  
    public static Connection getConnection(){  
        Connection conn = null;       
        try {  
            Context context = new InitialContext();  
            DataSource ds = (DataSource) context.lookup("java:comp/env/jdbc/test");  
            conn = ds.getConnection();  
        } catch (NamingException e) {  
            e.printStackTrace();  
        } catch (SQLException e) {  
            e.printStackTrace();  
        }         
        return conn;          
    }  
      
    public static void closeConnection(Connection conn, PreparedStatement pst,ResultSet rs){  
        try{  
            if(rs !=null){  
                rs.close();  
            }  
            if(pst !=null){  
                pst.close();  
            }  
            if(conn !=null){  
                conn.close();  
            }  
        }catch(SQLException e){  
            e.printStackTrace();  
        }  
    }  
}  

//StudentDao.java

Java代码  
package com.dao;  
  
import java.sql.Connection;  
import java.sql.PreparedStatement;  
import java.sql.ResultSet;  
import java.sql.SQLException;  
import java.util.ArrayList;  
import java.util.List;  
import com.model.Student;  
  
public class StudentDao {  
    public List<Student> findName(Student student){  
        Connection conn = null;  
        PreparedStatement pst = null;  
        ResultSet rs = null;  
          
        List<Student> list = new ArrayList<Student>();        
        try {  
            conn = DbManager.getConnection();  
            conn.setAutoCommit(false);  
            pst = conn.prepareStatement("select * from student where userName=? and userPwd=?");  
            pst.setString(1, student.getUserName());  
            pst.setString(2, student.getUserPwd());  
            rs = pst.executeQuery();  
            while (rs.next()){  
                list.add(new Student(rs.getString(1),rs.getString(2)));  
            }  
            conn.commit();  
        } catch (SQLException e) {  
            try {  
                conn.rollback();  
            } catch (SQLException e1) {  
                e1.printStackTrace();  
            }  
            e.printStackTrace();  
        }finally{  
            DbManager.closeConnection(conn, pst, rs);  
        }  
        return list;          
    }  
      
    public int create(Student student){  
        Connection conn = null;  
        PreparedStatement pst = null;  
        int state = 0;  
          
        try {  
            conn = DbManager.getConnection();  
            conn.setAutoCommit(false);  
            pst = conn.prepareStatement("insert into student values(?,?)");  
            pst.setString(1, student.getUserName());  
            pst.setString(2, student.getUserPwd());  
            state = pst.executeUpdate();  
            conn.commit();  
        }catch (SQLException e) {  
            try {  
                conn.rollback();  
            } catch (SQLException e1) {  
                e1.printStackTrace();  
            }  
            e.printStackTrace();  
        } finally {  
            DbManager.closeConnection(conn, pst, null);  
        }  
        return state;  
    }  
}  

//服务层service(StudentService.java)

Java代码  
package com.service;  
  
import java.util.List;  
import com.model.Student;  
  
public interface StudentService {  
    public List<Student> findName(Student student);  
    public int create(Student student);  
}  

//实现层(StudentServiceImpl.java)

Java代码  
package com.service.impl;  
  
import java.util.List;  
import com.dao.StudentDao;  
import com.model.Student;  
import com.service.StudentService;  
  
public class StudentServiceImpl implements StudentService {  
    private StudentDao studentDao;  
  
    public StudentServiceImpl() {  
        studentDao = new StudentDao();  
    }  
  
    public List<Student> findName(Student student) {  
        return studentDao.findName(student);  
    }  
  
    public int create(Student student) {  
        return studentDao.create(student);  
    }  
}  

//action层

//StringUtil.java

Java代码  
package com.action;  
  
public class StringUtil {  
    public static boolean isBlank(String str) {  
        return str == null || str.trim().length() == 0;  
    }  
}  

//StudentServlet.java

Java代码  
package com.action;  
  
import java.io.IOException;  
import java.util.List;  
import javax.servlet.ServletException;  
import javax.servlet.http.HttpServlet;  
import javax.servlet.http.HttpServletRequest;  
import javax.servlet.http.HttpServletResponse;  
import com.model.Student;  
import com.service.StudentService;  
import com.service.impl.StudentServiceImpl;  
  
public class StudentServlet extends HttpServlet {  
    private StudentService studentService;  
  
    public StudentServlet() {  
        studentService = new StudentServiceImpl();  
    }  
  
    public void doGet(HttpServletRequest request, HttpServletResponse response)  
            throws ServletException, IOException {  
        doPost(request, response);  
    }  
  
    public void doPost(HttpServletRequest request, HttpServletResponse response)  
            throws ServletException, IOException {  
        response.setContentType("text/html");  
        request.setCharacterEncoding("utf-8");  
        response.setCharacterEncoding("utf-8");  
        String userName = request.getParameter("userName");  
        String userPwd = request.getParameter("userPwd");  
        System.out.println(userName);  
        System.out.println(userPwd);  
          
        if(StringUtil.isBlank(userName)&&(StringUtil.isBlank(userPwd))){  
            request.setAttribute("error","姓名和密碼錯誤！");  
            request.getSession().setAttribute("login", "/login");  
            request.getRequestDispatcher("/login").forward(request, response);  
            return;  
        }  
          
        List<Student> list = studentService.findName(new Student(userName,userPwd));  
        if(list.size()>0){  
            request.getSession().setAttribute("login", list.get(0));  
            request.getRequestDispatcher("/chapter1.jsp").forward(request, response);  
        }else{  
            request.setAttribute("error", "账号和密码错误！");  
            request.getSession().setAttribute("login2", "login2");  
            request.getRequestDispatcher("/login").forward(request, response);  
            return;  
        }  
    }  
}  

//RigesterServlet.java

Java代码  
package com.action;  
  
import java.io.IOException;  
import javax.servlet.ServletException;  
import javax.servlet.http.HttpServlet;  
import javax.servlet.http.HttpServletRequest;  
import javax.servlet.http.HttpServletResponse;  
import com.model.Student;  
import com.service.StudentService;  
import com.service.impl.StudentServiceImpl;  
  
public class RigesterServlet extends HttpServlet {  
    private StudentService studentService;  
  
    public RigesterServlet() {  
        studentService = new StudentServiceImpl();  
    }  
    public void doGet(HttpServletRequest request, HttpServletResponse response)  
            throws ServletException, IOException {  
        doPost(request, response);  
    }  
  
    public void doPost(HttpServletRequest request, HttpServletResponse response)  
            throws ServletException, IOException {        
        response.setContentType("text/html");  
        request.setCharacterEncoding("utf-8");  
        response.setCharacterEncoding("utf-8");  
          
        String userName = request.getParameter("userName");  
        String userPwd = request.getParameter("userPwd");  
        String pwd2 = request.getParameter("pwd2");  
          
        request.setAttribute("userName", userName);  
        request.setAttribute("userPwd", userPwd);  
        request.setAttribute("pwd2", pwd2);  
          
        if(StringUtil.isBlank(userName)){  
            request.setAttribute("userName", userName);  
            request.getRequestDispatcher("/register").forward(request, response);  
            return;  
        }  
        if(StringUtil.isBlank(userPwd)){  
            request.setAttribute("userPwd", userPwd);  
            request.getRequestDispatcher("/register").forward(request, response);  
            return;  
        }  
        if(StringUtil.isBlank(pwd2)){  
            request.setAttribute("pwd2", pwd2);  
            request.getRequestDispatcher("/register").forward(request, response);  
            return;  
        }  
          
        Student student = new Student(userName,userPwd);  
        if(studentService.create(student)>0){  
            request.getRequestDispatcher("/chapter2.jsp").forward(request, response);  
        }  
    }  
}  

//context.xml 数据源配置文件

Java代码  
<Context>  
<Resource name="jdbc/test" auth="Container"  
    type="javax.sql.DataSource" maxActive="100" maxIdle="30"  
    maxWait="10000" username="sa" password="admin"  
    driverClassName="com.microsoft.sqlserver.jdbc.SQLServerDriver"  
    url="jdbc:sqlserver://localhost:1433;DatabaseName=test" />  
</Context>  

//login.jsp

Java代码  
<%@ page language="java" pageEncoding="utf-8"%>  
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>  
<c:set var="bathPath" value="${pageContext.request.contextPath}"/>  
  
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">  
<html>  
  <head>  
  </head>  
  <body>  
    <div>  
    <form action="${bathPath}/StudentServlet" method="post">  
        <div>  
            <label>用户名：</label>  
            <label><input type="text" name="userName" /></label><br />  
            <label>密&nbsp;&nbsp;碼：</label>  
            <label><input type="password" name="userPwd" /></label>             
        </div>  
        <div>  
            <label><input type="submit" value="登錄" /></label>  
            <label><input type="button" value="註冊" onclick="window.location='${bathPath}/register'"/></label>  
        </div>  
    </form>  
    </div>  
  </body>  
</html>  

//register.jsp

Java代码  
<%@ page language="java" pageEncoding="utf-8"%>  
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>  
<c:set var="bathPath" value="${pageContext.request.contextPath}"/>  
  
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">  
<html>  
  <head>  
  </head>  
  <body>  
    <div>  
    <form action="${bathPath}/RigesterServlet" method="post">  
        <div>  
            <label for="username" class="label">用&nbsp;户&nbsp;名:</label>  
                <input type="text" name="userName"/>  
                <label id="chage1"></label><br/>  
                <label for="username">*正确填写用户名,6-12位之间请用英文小写、下划线、数字。</label><br/>  
                <label for="pwd1">用户密码:</label>  
                <input type="password" name="userPwd" /><br/>  
                <label for="pwd1">*正确填写密码,6-12位之间请用英文小写、下划线、数字。</label><br/>  
                <label for="pwd2">确认密码:</label>  
                <input type="password" name="pwd2"/><br/>  
                <label for="pwd2">*两次密码要一致,请用英文小写、下划线、数字。</label><br/>  
        </div>  
        <div>  
            <label><input type="submit" value="註冊" /></label>  
            <label><input type="reset" value="取消" /></label>  
        </div>  
    </form>  
    </div>  
  </body>  
</html>  

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