/**
* Copyright (C), 2017-2017
* FileName: User
* Author: ichimoku
* Date: 2017/12/5 14:31
* version: 7.9.0
*
* 作者姓名 修改时间 版本号
*/
public class User {
//登陆查询 ----- 括号内接收从网页传来的用户输入的参数
public static Boolean CheckUser(String username,String password) {
int count = 0;
Connection conn = null;
PreparedStatement ps = null;
ResultSet rs = null;
// 1.加载驱动
try {
Class.forName("com.mysql.jdbc.Driver");
} catch (ClassNotFoundException e) {
System.out.println("加载驱动失败");
}
// 2.建立连接
try {
conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/数据库名", "用户名", "密码");
/*System.out.println("建立连接成功！");*/
String sql = "SELECT id FROM account WHERE name=? AND password=?";
ps=conn.prepareStatement(sql);
ps.setString(1,username);
ps.setString(2,password);
rs=ps.executeQuery();
while (rs.next()){
count++;
}
} catch (SQLException e) {
System.out.println("建立连接失败");
} finally {
// 3.关闭连接
try {
if (null != conn) {
conn.close();
}
if (null != ps) {
ps.close();
}
/*System.out.println("关闭连接成功!");*/
} catch (SQLException e) {
System.out.println("程序错误");
}
}
return count>0 ? true:false;
}
//新增用户 ----- 括号内接收从网页传来的用户输入的参数
public static void AddUser(String username,String password) {
Connection conn = null;
PreparedStatement ps = null;
ResultSet rs = null;
// 1.加载驱动
try {
Class.forName("com.mysql.jdbc.Driver");
} catch (ClassNotFoundException e) {
System.out.println("加载驱动失败");
}
// 2.建立连接
try {
conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/数据库名", "用户名", "密码");
/*System.out.println("建立连接成功！");*/
String sql = "INSERT INTO account SET (name,password) VALUE (?,?)";
ps=conn.prepareStatement(sql);
ps.setString(1,username);
ps.setString(2,password);
rs=ps.executeQuery();
} catch (SQLException e) {
System.out.println("建立连接失败");
} finally {
// 3.关闭连接
try {
if (null != conn) {
conn.close();
}
if (null != ps) {
ps.close();
}
System.out.println("关闭连接成功!！！");
} catch (SQLException e) {
System.out.println("程序错误");
}
}
}
//修改密码 --- 括号内接收从网页传来的用户输入的参数
public static void UpdateUser(String newpassword,String username,String password) {
Connection conn = null;
PreparedStatement ps = null;
ResultSet rs = null;
// 1.加载驱动
try {
Class.forName("com.mysql.jdbc.Driver");
} catch (ClassNotFoundException e) {
System.out.println("加载驱动失败");
}
// 2.建立连接
try {
conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/数据库名", "用户名", "密码");
/*System.out.println("建立连接成功！");*/
String sql = "UPDATE account SET password=? WHERE name=? AND password=?";
ps=conn.prepareStatement(sql);
ps.setString(1,newpassword);
ps.setString(2,username);
ps.setString(3,password);
rs=ps.executeQuery();
} catch (SQLException e) {
System.out.println("建立连接失败");
} finally {
// 3.关闭连接
try {
if (null != conn) {
conn.close();
}
if (null != ps) {
ps.close();
}
System.out.println("关闭连接成功!");
} catch (SQLException e) {
System.out.println("程序错误");
}
}
}
}
/**
* Copyright (C), 2017-2017
* FileName: Check
* Author: ichimoku
* Date: 2017/12/5 14:40
* version: 7.9.0
*
* 作者姓名 修改时间 版本号
*/
@WebServlet(name="CheckUser",urlPatterns="/servlet/CheckUser")
public class CheckUser extends HttpServlet{
private static final long serialVersionUID = 1L;
public CheckUser(){
super();
}
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
doPost(req, resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//从网页获取输入的用户名和密码
String username = new String(req.getParameter("username").getBytes("iso-8859-1"), "utf-8");
String password = req.getParameter("password");
//在控制台打印从网页获取到的用户名
System.out.println(username);
//判断用户名和密码是否为空
if (username!=null && password!=null){
boolean flag= User.CheckUser(username,password);
//通过flag返回值 为true就会执行if，false就会执行else
if (flag){
req.getRequestDispatcher("/pages/user/login_success.html").forward(req, resp);
}else{
//req.getRequestDispatcher("/pages/user//Welcome.jsp").forward(req, resp);
}
}else{
System.out.println("用户的输入为空");
}
}
}
/**
* Copyright (C), 2017-2017
* FileName: Add
* Author: ichimoku
* Date: 2017/12/5 16:01
* version: 7.9.0
*
* 作者姓名 修改时间 版本号
*/
@WebServlet(name="AddUser",urlPatterns="/servlet/AddUser")
public class AddUser extends HttpServlet {
private static final long serialVersionUID = 1L;
public AddUser(){
super();
}
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
doPost(req, resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//从网页获取输入的用户名和密码
String username = new String(req.getParameter("username").getBytes("iso-8859-1"), "utf-8");
String password = req.getParameter("password");
//在控制台打印从网页获取到的用户名
System.out.println(username);
//判断用户名和密码是否为空
if (username!=null && password!=null){
boolean flag=User.CheckUser(username,password);
//通过flag返回值 为true就会执行if，false就会执行else，因为我们要新增用户，如果返回ture就说明
//这个账号已经有人使用，所以我们要提示注册失败，如果返回false,说明数据库里没有这个账号，可以注册
//在else里运行AddUser的方法，成功数据库在数据库里新增注册数据！
if (flag){
//req.getRequestDispatcher("/pages/user//Welcome.jsp").forward(req, resp);
}else{
//req.getRequestDispatcher("/pages/user//Welcome.jsp").forward(req, resp);
User.AddUser(username,password);
req.getRequestDispatcher("/pages/user/login_success.html").forward(req, resp);
}
}else{
System.out.println("用户的输入为空");
}
}
}
/**
* Copyright (C), 2017-2017
* FileName: Update
* Author: ichimoku
* Date: 2017/12/5 16:05
* version: 7.9.0
*
* 作者姓名 修改时间 版本号
*/
@WebServlet(name="UpdateUser",urlPatterns="/servlet/UpdateUser")
public class UpdateUser extends HttpServlet {
private static final long serialVersionUID = 1L;
public UpdateUser(){
super();
}
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
doPost(req, resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//从网页获取输入的用户名和密码
String username = new String(req.getParameter("username").getBytes("iso-8859-1"), "utf-8");
String password = req.getParameter("password");
String newpassword = req.getParameter("newpassword");
//在控制台打印从网页获取到的用户名
System.out.println(username);
//判断用户名和密码是否为空
if (username!=null && password!=null){
boolean flag=User.CheckUser(username,password);
//通过flag返回值 为true就会执行if，false就会执行else，因为我们要修改密码，所以当返回true，说明用户输入的账号密码
// 和数据库匹配成功！所以我们在if下面执行UpdateUser方法，修改数据库数值！
if (flag){
User.UpdateUser(newpassword,username,password);
req.getRequestDispatcher("/pages/user/login_success.html").forward(req, resp);
}else{
//req.getRequestDispatcher("/pages/user//Welcome.jsp").forward(req, resp);
}
}else {
System.out.println("用户的输入为空");
}
}
}
