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-  曙海教育集團論壇  (http://www.hufushizhe.com/bbs/index.asp)
--  JAVA語言開發  (http://www.hufushizhe.com/bbs/list.asp?boardid=64)
----  一個用JAVA語言開發的含有過濾器技術的Web小例子  (http://www.hufushizhe.com/bbs/dispbbs.asp?boardid=64&id=2475)

--  作者：wangxinxin
--  發布時間：2010-12-11 9:53:22
--  一個用JAVA語言開發的含有過濾器技術的Web小例子

一個用JAVA語言開發的含有過濾器技術的Web小例子
//在MySql中創建數據庫
create database logindb;
use logindb;
create table user_info
-> (
-> id int auto_increment primary key,
-> name varchar(10) unique not null,
-> age int not null,
-> password varchar(10) not null,
-> city char(10) not null,
-> type int not null
-> );
insert into user_info values(default,\'tom\',\'23\',\'123456\',\'wuxi\',0);
insert into user_info values(default,\'niit\',\'23\',\'123456\',\'shanghai\',1);
insert into user_info values(default,\'jerry\',\'25\',\'654321\',\'shanghai\',2);
insert into user_info values(default,\'admin\',\'25\',\'admin888\',\'shanghai\',3);
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
//構建一個JavaBean
package com.niit.login;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class UserInfoBean
{
       private Connection con;

       public UserInfoBean()
       {
            con = Connecter.getConnection();
       }

       /*
      * 得到用戶的類別代號
      * 0：普通用戶
      * 1：VIP用戶
      * 2：管理員
      * 3：超級管理員
      * -1：帳號或者密碼錯誤
      */
       public int getUserType(String name,String pass)
       {
            int type = -1;
            try
            {
                     PreparedStatement ps = con
                                    .prepareStatement("select type from user_info where name = ? and password = ?");
                     ps.setString(1, name);
                     ps.setString(2, pass);

                     ResultSet rs = ps.executeQuery();
                     if(rs.next())
                     {
                               type = rs.getInt(1);
                     }
            }
            catch (SQLException e)
            {
                     e.printStackTrace();
            }

            return type;
       }
}
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
//創建基本方法
package com.niit.login;

public class UserInfo
{
       private String name;

       private int age;

       private String password;

       private String city;

       private int type;

       public UserInfo()
       {
            // TODO 自動生成構造函數存根
       }

       public UserInfo(String name, int age, String password, String city, int type)
       {
            this.name = name;
            this.age = age;
            this.password = password;
            this.city = city;
            this.type = type;
       }

       public int getAge()
       {
            return age;
       }

       public void setAge(int age)
       {
            this.age = age;
       }

       public String getCity()
       {
            return city;
       }

       public void setCity(String city)
       {
            this.city = city;
       }

       public String getName()
       {
            return name;
       }

       public void setName(String name)
       {
            this.name = name;
       }

       public String getPassword()
       {
            return password;
       }

       public void setPassword(String password)
       {
            this.password = password;
       }

       public int getType()
       {
            return type;
       }

       public void setType(int type)
       {
            this.type = type;
       }
}
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
//創建數據庫連接(該例使用的是MySql數據庫)
package com.niit.login;

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

public class Connecter
{
       public static Connection getConnection()
       {
            Connection con = null;
            try
            {
                     Class.forName("com.mysql.jdbc.Driver");
                     String url = "jdbc:mysql://127.0.0.1/logindb?useUnicode=true&characterEncoding=GBK";
                     con = DriverManager.getConnection(url, "root", "");
            }
            catch (ClassNotFoundException e)
            {
                     e.printStackTrace();
            }
            catch (SQLException e)
            {
                     e.printStackTrace();
            }

            return con;
       }
}
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
//創建過濾器
package com.niit.login;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class ManagerLoginFilter implements Filter
{
       public void init(FilterConfig config) throws ServletException
       {

       }

       /*
      * 執行功能的核心方法(過濾器)
      */
       public void doFilter(ServletRequest req, ServletResponse res,
                     FilterChain chain) throws IOException, ServletException
       {
            //將請求和響應轉變成 HTTP的請求和響應
            HttpServletRequest request = (HttpServletRequest)req;
            HttpServletResponse response = (HttpServletResponse)res;

            request.setCharacterEncoding("gb2312");

            HttpSession session = request.getSession();

            Object obj = session.getAttribute("MANAGERLOGIN");
            if(obj == null)
            {
                     //目前沒有登錄成功
                     String name = request.getParameter("userName");
                     String pass = request.getParameter("userPass");

                     if(name == null || pass == null)
                     {
                               System.out.println("*********別走后門**********");
                               response.sendRedirect("login.html");
                     }
                    else
                     {

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