Struts2不同角色登錄系統

1、搭建Struts2環境
2、創建實體類
admin、manager、student

package cn.sushe.model;

public class Admin {
    private int adminId;
    private String userName;
    private String password;
    private String name;
    private String sex;
    private String tel;

    //get,set方法
}

package cn.sushe.model;

public class Manager {
    private int manId;
    private String userName;
    private String password;
    private int departId;
    private String departName;
    private String manName;
    private String sex;
    private int tel;

//get,set方法

}

package cn.sushe.model;

public class Student {
    private int stuId;
    private String stuNum;
    private String userName;
    private String password;
    private int departId = 0;
    private String departName;
    private int dormId = 0;
    private String dormName;
    private String stuName;
    private String sex;
    private String tel;
    private String stuDesc;

   //get,set方法
}

3、數據庫連接類

package cn.sushe.utils;

import java.sql.Connection;
import java.sql.DriverManager;

public class DbUtil {
    private String dbUrl="jdbc:mysql://localhost:3306/db_dormitory";
    private String dbUserName="root";
    private String dbPassword="123456";
    private String jdbcName="com.mysql.jdbc.Driver";

    /**
     * 獲取數據庫鏈接
     * @return
     * @throws Exception
     */
    public Connection getCon() throws Exception{
        Class.forName(jdbcName);
        Connection con= DriverManager.getConnection(dbUrl,dbUserName,dbPassword);
        return con;
    }

    /**
     * 關閉數據庫鏈接
     * @param con
     * @throws Exception
     */
    public void closeCon(Connection con) throws  Exception{
        if (con!=null){
            con.close();
        }
    }

    /**
     * 測試數據庫鏈接
     * @param args
     */
    public static void main(String[] args){
        DbUtil dbUtil = new DbUtil();
        try {
            dbUtil.getCon();
            System.out.println("數據庫連接成功");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

4、對應dao層查詢數據庫

public class AdminDao {
    /**
     * 管理員登錄
     * @param username
     * @param password
     * @return
     * @throws Exception
     */
    public String checkLogin(String username,String password)throws Exception{
        String id=null;
        String sql="select * from t_admin where userName='"+username+"' and password='"+password+"'";
        Statement stat=null;
        ResultSet rs = null;
        Connection con=new DbUtil().getCon();
        try {
            stat=con.createStatement();
            rs=stat.executeQuery(sql);
            while (rs.next()) {
                id=rs.getString("adminId");
            }
        } catch (SQLException ex) {}
        return id;
    }
}

public class ManagerDao {
    public String checkLogin(String username,String password) throws Exception{
        String id=null;
        String sql="select * from t_manager where userName='"+username+"' and password='"+password+"'";
        Statement stat=null;
        ResultSet rs = null;
        Connection con=new DbUtil().getCon();
        try {
            stat=con.createStatement();
            rs=stat.executeQuery(sql);
            while (rs.next()) {
                id=rs.getString("manId");
            }
        } catch (SQLException ex) {}
        return id;
    }
}

public class StudentDao {
    public String checkLogin(String username,String password) throws Exception{
        String id=null;
        String sql="select * from t_student where userName='"+username+"' and password='"+password+"'";
        Statement stat=null;
        ResultSet rs = null;
        Connection con=new DbUtil().getCon();
        try {
            stat=con.createStatement();
            rs=stat.executeQuery(sql);
            while (rs.next()) {
                id=rs.getString("stuId");
            }
        } catch (SQLException ex) {}
        return id;
    }
}

*

5、action業務處理

*

package cn.sushe.action;


import javax.servlet.http.HttpSession;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;

import cn.sushe.dao.AdminDao;
import cn.sushe.dao.ManagerDao;
import cn.sushe.dao.StudentDao;
import cn.sushe.model.Admin;
import cn.sushe.model.Manager;
import cn.sushe.model.Student;
import cn.sushe.utils.DbUtil;
import cn.sushe.utils.StringUtil;

public class LoginAction extends ActionSupport {

    private static final long serialVersionUID = 1L;

    private String userType;
    private String username;
    private String password;
    private String msg;
    private Admin admin;
    private Manager manager;
    private Student student;

    public String getUserType() {
        return userType;
    }

    public void setUserType(String userType) {
        this.userType = userType;
    }

    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;
    }


    public String getMsg() {
        return msg;
    }

    public void setMsg(String msg) {
        this.msg = msg;
    }


    DbUtil dbUtil = new DbUtil();
    AdminDao adminDao = new AdminDao(); 
    ManagerDao managerDao = new ManagerDao();
    StudentDao studentDao = new StudentDao();

    @Override
    public String execute() throws Exception {

        if (StringUtil.isEmpty(username)||StringUtil.isEmpty(password)) {
            msg="用戶名或密碼爲空！";
            return ERROR;
        }

        if ("admin".equals(userType)) {
            if (null==adminDao.checkLogin(username, password)) {
                msg="用戶名或者密碼錯誤";
                return ERROR;
            } else {
                String adminId=adminDao.checkLogin(username, password);
                //創建session
                HttpSession session = ServletActionContext.getRequest().getSession();
                session.setAttribute("adminId", adminId);
                session.setAttribute("userType", "系統管理員");
                return SUCCESS;
            }
        } else if ("manager".equals(userType)){
            if (null==managerDao.checkLogin(username, password)) {
                msg="用戶名或者密碼錯誤";
                return ERROR;
            } else {
                String manId=managerDao.checkLogin(username, password);
                //創建session
                HttpSession session = ServletActionContext.getRequest().getSession();
                session.setAttribute("manId", manId);
                session.setAttribute("userType", "宿舍管理員");
                return SUCCESS;
            }
        } else if ("student".equals(userType)) {
            if (null==studentDao.checkLogin(username, password)) {
                msg="用戶名或者密碼錯誤";
                return ERROR;
            } else {
                String stuId=studentDao.checkLogin(username, password);
                //創建session
                HttpSession session = ServletActionContext.getRequest().getSession();
                session.setAttribute("stuId", stuId);
                session.setAttribute("userType", "學生");
                return "success2";
            }
        }else {
            msg="身份類型錯誤！";
            return ERROR;
        }

    }

}

6、struts.xml頁面跳轉配置

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
    "http://struts.apache.org/dtds/struts-2.3.dtd">

<struts>
    <package name="user" namespace="/" extends="struts-default">
        <action name="login" class="cn.sushe.action.LoginAction">
            <result name="error">/login.jsp</result>
            <result name="success" type="redirect">/index.jsp</result>
            <result name="success2" type="redirect">/main.jsp</result>
        </action>
    </package>

</struts>

• 其實很簡單，但之前沒搞懂的時候覺得無從下手，所以留個大概思路以便以後能很方便的想起來。
• 代碼只是工具，編程思想很重要
• 新手有什麼不懂的，可以留言，我也是新手，不過交流使人進入，你正好需要，我正好擁有