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    开发工具  idea    MySql

    用户表

    1.系统登陆

    实体类

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    public class UserInfo {
         private Integer userCode;
         private String userName;
         private String userPwd;
         private Date lastLoginTime;
         private boolean isUse;
         //alt+insert
     
        public Integer getUserCode() {
            return userCode;
        }
     
        public void setUserCode(Integer userCode) {
            this.userCode = userCode;
        }
     
        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;
        }
     
        public Date getLastLoginTime() {
            return lastLoginTime;
        }
     
        public void setLastLoginTime(Date lastLoginTime) {
            this.lastLoginTime = lastLoginTime;
        }
     
        public boolean isUse() {
            return isUse;
        }
     
        public void setUse(boolean use) {
            isUse = use;
        }
    }

    　

    　BaseDao

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    package cn.blog.dao;
     
    import java.sql.Connection;
    import java.sql.DriverManager;
    import java.sql.PreparedStatement;
    import java.sql.ResultSet;
    import java.sql.SQLException;
     
     
    /**
     * 数据访问工具类
     * @version 1.1
     * @author happy
     *
     */
    public class BaseDao {
        // 01. 基础内容的准备
        private static final String driver="com.mysql.jdbc.Driver";
        private static final String url="jdbc:mysql:///blog";
        private static final String username="root";
        private static final String pwd="root";
     
        //02, 接口对象的准备
        Connection con=null;
        PreparedStatement ps=null;
        public ResultSet rs=null;
     
        /**
         * 01.写一个用户获取到一个连接对象的方法，方法的返回值是Connection类型
         * @return   连接对象
         * @throws Exception
         */
        public Connection getConnection() throws Exception{
            Class.forName(driver);
            //什么条件下，构建connection对象
            if (con==null||con.isClosed()) {
                con=DriverManager.getConnection(url, username, pwd);
            }
            //同志们碰到一个
            return con;
        }
     
     
     
     
        /**
         * 执行查询操作  目的：返回一个读取器
         * @param sql  sql语句
         * @param objs  参数列表
         * @return     读取器对象
         * @throws Exception
         */
        public ResultSet  executeQuery(String sql,Object... objs) throws Exception{
            con=getConnection();
            ps = con.prepareStatement(sql);
            for (int i = 0; i < objs.length; i++) {
                ps.setObject(i+1, objs[i]);
            }
            rs= ps.executeQuery();
            return rs;
        }
     
        /**
         * 执行增删该操作
         * @param sql  sql语句
         * @param objs  参数列表
         * @return     受影响行数
         * @throws Exception
         */
        public int executeUpdate(String sql,Object... objs) throws Exception{
            con=getConnection();
            ps = con.prepareStatement(sql);
            for (int i = 0; i < objs.length; i++) {
                ps.setObject(i+1, objs[i]);
            }
            int count = ps.executeUpdate();
            return count;
        }
     
     
     
     
        /**
         * 回收连接资源
         * @throws Exception
         */
        public void closeAll() throws Exception{
            //倒着回收
            if(rs!=null){
                rs.close();
            }
            if (ps!=null) {
                ps.close();
            }
            if(con!=null){
                con.close();
            }
        }
     
    }

    　　dao层impl实现

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    package cn.blog.dao.iimpl;
     
    import cn.blog.dao.BaseDao;
    import cn.blog.dao.IUserInfoDAO;
    import cn.blog.entity.UserInfo;
    import org.junit.Test;
     
     
    import java.sql.ResultSet;
     
    /**
     * Created by Happy on 2017-06-30.
     */
    public class UserInfoDAOImpl extends BaseDao implements IUserInfoDAO {
     
     
        @Test
       public void testIsLogin(){
           UserInfo info=new UserInfo();
           info.setUserCode(11);
           info.setUserPwd("123");
           try {
               boolean flag = isLogin(info);
               System.out.println(flag);
           } catch (Exception e) {
               e.printStackTrace();
           }
       }
     
     
        public boolean isLogin(UserInfo info) throws Exception {
            boolean flag=false;
            //根据用户名和密码查看复合条件的记录有几条》》》》》》》》》》》》》》
            String  sql="select count(1) as UserCode from userInfo where UserCode=? and UserPwd=?";
            Object[] paras={info.getUserCode(),info.getUserPwd()};
            ResultSet rs = executeQuery(sql, paras);
            if (rs.next()){
                if (rs.getInt("UserCode")>0){
                    flag=true;
                }
            }
            return flag;
        }
     
     
     
    }

    　　selvlet层

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    package cn.blog.servlet;
     
    import cn.blog.dao.IUserInfoDAO;
    import cn.blog.dao.iimpl.UserInfoDAOImpl;
    import cn.blog.entity.UserInfo;
     
    import javax.servlet.ServletException;
    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    import java.io.IOException;
     
    /**
     * Created by Happy on 2017-06-30.
     */
    public class UserInfoServlet extends HttpServlet {
        protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
            //write code here please ,oK?
            //使用dao实现类
            IUserInfoDAO dao=new UserInfoDAOImpl();
            String userCode=request.getParameter("userCode");
            String userPwd=request.getParameter("userPwd");
            UserInfo info=new UserInfo();
            System.out.println(userCode+"===================");
            info.setUserCode(Integer.parseInt(userCode));
            info.setUserPwd(userPwd);
            try {
                boolean flag = dao.isLogin(info);
                if (flag){
                    request.getRequestDispatcher("/BlogHtTemplate-master/html/main.html").forward(request,response);
                }else{
                    response.sendRedirect("/BlogHtTemplate-master/html/index.html");
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
     
            //  dao.isLogin();
            //跳转
     
        }
     
        protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
            doPost(request,response);
        }
    }

    　　实现效果

    开发工具  idea    MySql

    用户表

    1.系统登陆

    实体类

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    public class UserInfo {
         private Integer userCode;
         private String userName;
         private String userPwd;
         private Date lastLoginTime;
         private boolean isUse;
         //alt+insert
     
        public Integer getUserCode() {
            return userCode;
        }
     
        public void setUserCode(Integer userCode) {
            this.userCode = userCode;
        }
     
        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;
        }
     
        public Date getLastLoginTime() {
            return lastLoginTime;
        }
     
        public void setLastLoginTime(Date lastLoginTime) {
            this.lastLoginTime = lastLoginTime;
        }
     
        public boolean isUse() {
            return isUse;
        }
     
        public void setUse(boolean use) {
            isUse = use;
        }
    }

    　　BaseDao

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    package cn.blog.dao;
     
    import java.sql.Connection;
    import java.sql.DriverManager;
    import java.sql.PreparedStatement;
    import java.sql.ResultSet;
    import java.sql.SQLException;
     
     
    /**
     * 数据访问工具类
     * @version 1.1
     * @author happy
     *
     */
    public class BaseDao {
        // 01. 基础内容的准备
        private static final String driver="com.mysql.jdbc.Driver";
        private static final String url="jdbc:mysql:///wk";
        private static final String username="root";
        private static final String pwd="";
     
        //02, 接口对象的准备
        Connection con=null;
        PreparedStatement ps=null;
        public ResultSet rs=null;
     
        /**
         * 01.写一个用户获取到一个连接对象的方法，方法的返回值是Connection类型
         * @return   连接对象
         * @throws Exception
         */
        public Connection getConnection() throws Exception{
            Class.forName(driver);
            //什么条件下，构建connection对象
            if (con==null||con.isClosed()) {
                con=DriverManager.getConnection(url, username, pwd);
            }
            //同志们碰到一个
            return con;
        }
     
     
     
     
        /**
         * 执行查询操作  目的：返回一个读取器
         * @param sql  sql语句
         * @param objs  参数列表
         * @return     读取器对象
         * @throws Exception
         */
        public ResultSet  executeQuery(String sql,Object... objs) throws Exception{
            con=getConnection();
            ps = con.prepareStatement(sql);
            for (int i = 0; i < objs.length; i++) {
                ps.setObject(i+1, objs[i]);
            }
            rs= ps.executeQuery();
            return rs;
        }
     
        /**
         * 执行增删该操作
         * @param sql  sql语句
         * @param objs  参数列表
         * @return     受影响行数
         * @throws Exception
         */
        public int executeUpdate(String sql,Object... objs) throws Exception{
            con=getConnection();
            ps = con.prepareStatement(sql);
            for (int i = 0; i < objs.length; i++) {
                ps.setObject(i+1, objs[i]);
            }
            int count = ps.executeUpdate();
            return count;
        }
     
     
     
     
        /**
         * 回收连接资源
         * @throws Exception
         */
        public void closeAll() throws Exception{
            //倒着回收
            if(rs!=null){
                rs.close();
            }
            if (ps!=null) {
                ps.close();
            }
            if(con!=null){
                con.close();
            }
        }
     
    }

    　　dao层impl实现

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    package cn.blog.dao.iimpl;
     
    import cn.blog.dao.BaseDao;
    import cn.blog.dao.IUserInfoDAO;
    import cn.blog.entity.UserInfo;
    import org.junit.Test;
     
     
    import java.sql.ResultSet;
     
    /**
     * Created by Happy on 2017-06-30.
     */
    public class UserInfoDAOImpl extends BaseDao implements IUserInfoDAO {
     
     
        @Test
       public void testIsLogin(){
           UserInfo info=new UserInfo();
           info.setUserCode(11);
           info.setUserPwd("123");
           try {
               boolean flag = isLogin(info);
               System.out.println(flag);
           } catch (Exception e) {
               e.printStackTrace();
           }
       }
     
     
        public boolean isLogin(UserInfo info) throws Exception {
            boolean flag=false;
            //根据用户名和密码查看复合条件的记录有几条》》》》》》》》》》》》》》
            String  sql="select count(1) as UserCode from userInfo where UserCode=? and UserPwd=?";
            Object[] paras={info.getUserCode(),info.getUserPwd()};
            ResultSet rs = executeQuery(sql, paras);
            if (rs.next()){
                if (rs.getInt("UserCode")>0){
                    flag=true;
                }
            }
            return flag;
        }
     
     
     
    }

    　　selvlet层

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    package cn.blog.servlet;
     
    import cn.blog.dao.IUserInfoDAO;
    import cn.blog.dao.iimpl.UserInfoDAOImpl;
    import cn.blog.entity.UserInfo;
     
    import javax.servlet.ServletException;
    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    import java.io.IOException;
     
    /**
     * Created by Happy on 2017-06-30.
     */
    public class UserInfoServlet extends HttpServlet {
        protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
            //write code here please ,oK?
            //使用dao实现类
            IUserInfoDAO dao=new UserInfoDAOImpl();
            String userCode=request.getParameter("userCode");
            String userPwd=request.getParameter("userPwd");
            UserInfo info=new UserInfo();
            System.out.println(userCode+"===================");
            info.setUserCode(Integer.parseInt(userCode));
            info.setUserPwd(userPwd);
            try {
                boolean flag = dao.isLogin(info);
                if (flag){
                    request.getRequestDispatcher("/BlogHtTemplate-master/html/main.html").forward(request,response);
                }else{
                    response.sendRedirect("/BlogHtTemplate-master/html/index.html");
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
     
            //  dao.isLogin();
            //跳转
     
        }
     
        protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
            doPost(request,response);
        }
    }

    　　实现效果
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  • 原文地址：https://www.cnblogs.com/hfddz/p/7105088.html
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