博客系统

开发工具 idea MySql

用户表

1.系统登陆

实体类

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

100

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

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

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

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

100

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

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

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

时间： 2024-10-06 21:02:02

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