java-----Servlet框架

package com;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class ParamServlet extends HttpServlet{
@Override
protected void service(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
//设置请求和响应的编码
request.setCharacterEncoding(“utf-8”);
response.setCharacterEncoding(“utf-8”);
//获取客户端参数
String name = request.getParameter(“name”);
//获取输出流
PrintWriter out = response.getWriter();
if(name==null){
out.println(“not name exist”);
}else{
out.println(name);
}
}
}
package dao;

import java.util.List;

import entity.Account;

public interface AccountDao {
//插入一条数据
public void insertAccount(Account acc);
//更新一条数据
public void updateAccount(Account acc);
//根据card_id删除一条信息
public void deleteAccount(Integer card_id);
//查询所有信息
public List queryAccount();
//根据card_id查询用户信息
public Account queryByIdAccount(Integer card_id);
}
package dao;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

import util.JDBCUtil3;

import entity.Account;

public class AccountDaoImpl implements AccountDao{

public void insertAccount(Account acc) {
	Connection conn = null;
	PreparedStatement pstm =null;

	try {
		conn = JDBCUtil3.getConnection();
		//3.创建PreparedStatement
		pstm = conn.prepareStatement("insert into account values(account_seq.nextval,?,?,?,?)");
		pstm.setString(1, acc.getUsername());
		pstm.setString(2, acc.getPassword());
		pstm.setDouble(3, acc.getBalance());
		pstm.setString(4, acc.getMobile());
		//4.执行sql
		pstm.executeUpdate();
		//5.处理结果集
	} catch (Exception e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
	}finally{
		try {
			JDBCUtil3.close(null, pstm, null);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

}

public void updateAccount(Account acc) {
	Connection conn = null;
	PreparedStatement pstm = null;
	
	try {
		conn = JDBCUtil3.getConnection();
		//3.创建PreparedStatement
		pstm = conn.prepareStatement("update account set username=?,password=?," +
				"balance=?," +
				"mobile=? where card_id=?");

		pstm.setString(1, acc.getUsername());
		pstm.setString(2, acc.getPassword());
		pstm.setDouble(3, acc.getBalance());
		pstm.setString(4, acc.getMobile());
		pstm.setInt(5, acc.getCard_id());
		//4.执行sql
		pstm.executeUpdate();
		//5.处理结果集
	}  catch (Exception e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
	}finally{
		
		try {
			JDBCUtil3.close(null, pstm, null);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

}

public void deleteAccount(Integer card_id) {
	Connection conn =null;
	//3.创建PreparedStatement
	PreparedStatement pstm=null;
	try {
		conn = JDBCUtil3.getConnection();
		pstm = conn.prepareStatement("delete from account where card_id=?");
		pstm.setInt(1, card_id);
		//4.执行sql
		pstm.executeUpdate();
		//5.处理结果集
	} catch (Exception e) {
		// TODO: handle exception
	}finally{
		try {
			JDBCUtil3.close(null, pstm, null);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

}

public List<Account> queryAccount() {
	Connection conn = null;
	//3.创建PreparedStatement
	PreparedStatement pstm = null;
	//4.执行sql
	ResultSet rs = null;
	//创建一个List<Account>
	List<Account> list = null;
	try {
		conn = JDBCUtil3.getConnection();
		pstm = conn.prepareStatement("select * from account");
		rs = pstm.executeQuery();
		list = new ArrayList<Account>();
		//声明一个Account 变量
		Account acc = null;
		//5.处理结果集
		while(rs.next()){
			acc = new Account();
			acc.setCard_id(rs.getInt(1));
			acc.setUsername(rs.getString(2));
			acc.setPassword(rs.getString(3));
			acc.setBalance(rs.getDouble(4));
			acc.setMobile(rs.getString(5));
			
			list.add(acc);
		}
	}catch (Exception e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
	}finally{
		
		try {
			JDBCUtil3.close(rs, pstm, null);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	return list;
}

public Account queryByIdAccount(Integer card_id) {
	Connection conn = null;
	//3.创建PreparedStatement
	PreparedStatement pstm = null;
	//4.执行sql
	ResultSet rs =null;
	//5.处理结果集
	Account a=null;
	try {
		conn = JDBCUtil3.getConnection();
		pstm = conn.prepareStatement("select * from account where card_id=?");
		pstm.setInt(1, card_id);
		rs = pstm.executeQuery();

		
		while(rs.next()){
			a = new Account();
			a.setCard_id(rs.getInt(1));
			a.setUsername(rs.getString(2));
			a.setPassword(rs.getString(3));
			a.setBalance(rs.getDouble(4));
			a.setMobile(rs.getString(5));

		}
	}  catch (Exception e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
	}finally{
		try {
			JDBCUtil3.close(rs, pstm, null);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	
	return a;
}

}
package dao;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

import util.JDBCUtil3;

import entity.Account;

public class AccountDaoImpl implements AccountDao{

public void insertAccount(Account acc) {
	Connection conn = null;
	PreparedStatement pstm =null;

	try {
		conn = JDBCUtil3.getConnection();
		//3.创建PreparedStatement
		pstm = conn.prepareStatement("insert into account values(account_seq.nextval,?,?,?,?)");
		pstm.setString(1, acc.getUsername());
		pstm.setString(2, acc.getPassword());
		pstm.setDouble(3, acc.getBalance());
		pstm.setString(4, acc.getMobile());
		//4.执行sql
		pstm.executeUpdate();
		//5.处理结果集
	} catch (Exception e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
	}finally{
		try {
			JDBCUtil3.close(null, pstm, null);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

}

public void updateAccount(Account acc) {
	Connection conn = null;
	PreparedStatement pstm = null;
	
	try {
		conn = JDBCUtil3.getConnection();
		//3.创建PreparedStatement
		pstm = conn.prepareStatement("update account set username=?,password=?," +
				"balance=?," +
				"mobile=? where card_id=?");

		pstm.setString(1, acc.getUsername());
		pstm.setString(2, acc.getPassword());
		pstm.setDouble(3, acc.getBalance());
		pstm.setString(4, acc.getMobile());
		pstm.setInt(5, acc.getCard_id());
		//4.执行sql
		pstm.executeUpdate();
		//5.处理结果集
	}  catch (Exception e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
	}finally{
		
		try {
			JDBCUtil3.close(null, pstm, null);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

}

public void deleteAccount(Integer card_id) {
	Connection conn =null;
	//3.创建PreparedStatement
	PreparedStatement pstm=null;
	try {
		conn = JDBCUtil3.getConnection();
		pstm = conn.prepareStatement("delete from account where card_id=?");
		pstm.setInt(1, card_id);
		//4.执行sql
		pstm.executeUpdate();
		//5.处理结果集
	} catch (Exception e) {
		// TODO: handle exception
	}finally{
		try {
			JDBCUtil3.close(null, pstm, null);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

}

public List<Account> queryAccount() {
	Connection conn = null;
	//3.创建PreparedStatement
	PreparedStatement pstm = null;
	//4.执行sql
	ResultSet rs = null;
	//创建一个List<Account>
	List<Account> list = null;
	try {
		conn = JDBCUtil3.getConnection();
		pstm = conn.prepareStatement("select * from account");
		rs = pstm.executeQuery();
		list = new ArrayList<Account>();
		//声明一个Account 变量
		Account acc = null;
		//5.处理结果集
		while(rs.next()){
			acc = new Account();
			acc.setCard_id(rs.getInt(1));
			acc.setUsername(rs.getString(2));
			acc.setPassword(rs.getString(3));
			acc.setBalance(rs.getDouble(4));
			acc.setMobile(rs.getString(5));
			
			list.add(acc);
		}
	}catch (Exception e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
	}finally{
		
		try {
			JDBCUtil3.close(rs, pstm, null);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	return list;
}

public Account queryByIdAccount(Integer card_id) {
	Connection conn = null;
	//3.创建PreparedStatement
	PreparedStatement pstm = null;
	//4.执行sql
	ResultSet rs =null;
	//5.处理结果集
	Account a=null;
	try {
		conn = JDBCUtil3.getConnection();
		pstm = conn.prepareStatement("select * from account where card_id=?");
		pstm.setInt(1, card_id);
		rs = pstm.executeQuery();

		
		while(rs.next()){
			a = new Account();
			a.setCard_id(rs.getInt(1));
			a.setUsername(rs.getString(2));
			a.setPassword(rs.getString(3));
			a.setBalance(rs.getDouble(4));
			a.setMobile(rs.getString(5));

		}
	}  catch (Exception e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
	}finally{
		try {
			JDBCUtil3.close(rs, pstm, null);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	
	return a;
}

}
package dao;

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

import util.JDBCUtil3;
import entity.User;

public class UserDaoImpl implements UserDao{

public User queryByUsernameAndPwd(String username, String password) {
	Connection conn = null;
	PreparedStatement pstm = null;
	ResultSet rs = null;
	try{
		//获取链接
		conn = JDBCUtil3.getConnection();
		pstm = conn.prepareStatement("select * from test_user " +
				"where username=? and password=?");
		pstm.setString(1, username);
		pstm.setString(2, password);
		rs = pstm.executeQuery();
		User user = null;
		while(rs.next()){
			
			user = new User(rs.getString(1),rs.getString(2));
		}
		return user;
	}catch(Exception e){
		e.printStackTrace();
		throw new RuntimeException("登陆失败 用户名或密码错误");
	}finally{
		try {
			JDBCUtil3.close(rs, pstm, null);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	
	
}

}
package entity;

import java.io.Serializable;

public class Account implements Serializable{
private Integer card_id;
private String username;
private String password;
private Double balance;
private String mobile;
public Integer getCard_id() {
return card_id;
}
public void setCard_id(Integer card_id) {
this.card_id = card_id;
}
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 Double getBalance() {
return balance;
}
public void setBalance(Double balance) {
this.balance = balance;
}
public String getMobile() {
return mobile;
}
public void setMobile(String mobile) {
this.mobile = mobile;
}
public Account() {
super();
// TODO Auto-generated constructor stub
}
public Account(Integer card_id, String username, String password,
Double balance, String mobile) {
super();
this.card_id = card_id;
this.username = username;
this.password = password;
this.balance = balance;
this.mobile = mobile;
}
@Override
public String toString() {
return “Account [card_id=” + card_id + “, username=” + username
+ “, password=” + password + “, balance=” + balance
+ “, mobile=” + mobile + “]”;
}

}
package entity;

import java.io.Serializable;

public class User implements Serializable{
private String username;
private String password;
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 User(String username, String password) {
super();
this.username = username;
this.password = password;
}
public User() {
super();
// TODO Auto-generated constructor stub
}
@Override
public String toString() {
return “User [username=” + username + “, password=” + password + “]”;
}

}
package service;

import java.util.List;

import entity.Account;

public interface AccountService {
//转账操作
public void transfer(Integer fromCard,String password,
Integer toCard,Double money);
//插入一条数据
public void insertAccount(Account acc);
//更新一条数据
public void updateAccount(Account acc);
//根据card_id删除一条信息
public void deleteAccount(Integer card_id);
//查询所有信息
public List queryAccount();
//根据card_id查询用户信息
public Account queryByIdAccount(Integer card_id);
}
package service;

import java.sql.Connection;
import java.sql.SQLException;
import java.util.List;

import util.JDBCUtil3;
import dao.AccountDao;
import dao.AccountDaoImpl;
import dao.UserDao;
import dao.UserDaoImpl;
import entity.Account;
import entity.User;

public class AccountServiceImpl implements AccountService{

public void insertAccount(Account acc) {
	Connection conn = null;
	try{
		conn = JDBCUtil3.getConnection();
		conn.setAutoCommit(false);
		//调用dao
		AccountDao ud = new AccountDaoImpl();
		ud.insertAccount(acc);
		conn.commit();
	}catch(Exception e){
		try {
			conn.rollback();
		} catch (SQLException e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
		}
		e.printStackTrace();
		throw new RuntimeException("插入失败");
	}finally{
		try {
			JDBCUtil3.close(null, null, conn);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

}

public void updateAccount(Account acc) {
	Connection conn = null;
	try{
		conn = JDBCUtil3.getConnection();
		conn.setAutoCommit(false);
		//调用dao
		AccountDao ud = new AccountDaoImpl();
		ud.updateAccount(acc);
		conn.commit();
	}catch(Exception e){
		try {
			conn.rollback();
		} catch (SQLException e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
		}
		e.printStackTrace();
		throw new RuntimeException("更新失败");
	}finally{
		try {
			JDBCUtil3.close(null, null, conn);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
}

public void deleteAccount(Integer card_id) {
	Connection conn = null;
	try{
		conn = JDBCUtil3.getConnection();
		conn.setAutoCommit(false);
		//调用dao
		AccountDao ud = new AccountDaoImpl();
		ud.deleteAccount(card_id);
		conn.commit();
	}catch(Exception e){
		try {
			conn.rollback();
		} catch (SQLException e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
		}
		e.printStackTrace();
		throw new RuntimeException("删除失败");
	}finally{
		try {
			JDBCUtil3.close(null, null, conn);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

}

public List<Account> queryAccount() {
	Connection conn = null;
	try{
		conn = JDBCUtil3.getConnection();
		conn.setAutoCommit(false);
		//调用dao
		AccountDao ud = new AccountDaoImpl();
		List<Account> list = ud.queryAccount();
		conn.commit();

		return list;
	}catch(Exception e){
		try {
			conn.rollback();
		} catch (SQLException e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
		}
		e.printStackTrace();
		throw new RuntimeException("查询失败");
	}finally{
		try {
			JDBCUtil3.close(null, null, conn);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
}

public Account queryByIdAccount(Integer card_id) {
	Connection conn = null;
	try{
		conn = JDBCUtil3.getConnection();
		conn.setAutoCommit(false);
		//调用dao
		AccountDao ud = new AccountDaoImpl();
		Account account = ud.queryByIdAccount(card_id);
		conn.commit();

		return account;
	}catch(Exception e){
		try {
			conn.rollback();
		} catch (SQLException e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
		}
		e.printStackTrace();
		throw new RuntimeException("查询失败");
	}finally{
		try {
			JDBCUtil3.close(null, null, conn);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
}
public void transfer(Integer fromCard, String password, Integer toCard,
		Double money) {
	//获取一个Connection
	Connection conn = null;
	try {
		conn = JDBCUtil3.getConnection();
		//设置手动事务
		conn.setAutoCommit(false);
		//1.验证转账账户
		AccountDao ad = new AccountDaoImpl();
		Account acc = ad.queryByIdAccount(fromCard);
		if (acc == null) {
			throw new RuntimeException("用户不存在！~");
		}
		if (!password.equals(acc.getPassword())) {
			throw new RuntimeException("用户密码错误！~");
		}
		//2.更新转账账户余额  -- 判断转账金额 是否大于当前余额
		if (money > acc.getBalance()) {
			throw new RuntimeException("余额不足！~");
		}
		Double newBalance = acc.getBalance() - money;
		acc.setBalance(newBalance);
		ad.updateAccount(acc);
		System.out.println("更新转账账户余额成功！~");
		//3.验证对方的账户
		Account toAcc = ad.queryByIdAccount(toCard);
		if (toAcc == null) {
			throw new RuntimeException("对方账户不存在！·");
		}
		//4.更新对方账户余额
		Double toBalance = toAcc.getBalance() + money;
		toAcc.setBalance(toBalance);
		ad.updateAccount(toAcc);
		System.out.println("转账成功~");
		//手动提交事务
		conn.commit();
	} catch (Exception e) {
		//手动回滚事务
		try {
			conn.rollback();
		} catch (SQLException e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
		}
		e.printStackTrace();
		throw new RuntimeException(e);
	}finally{
		try {
			JDBCUtil3.close(null, null, conn);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

}

}
package service;

import entity.User;

public interface UserService {
//验证登陆
public User doLogin(String username,String password);
}
package service;

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

import util.JDBCUtil3;
import dao.UserDao;
import dao.UserDaoImpl;
import entity.User;

public class UserServiceImpl implements UserService{

public User doLogin(String username, String password) {
	Connection conn = null;
	try{
		conn = JDBCUtil3.getConnection();
		conn.setAutoCommit(false);
		//调用dao
		UserDao ud = new UserDaoImpl();
		User user = ud.queryByUsernameAndPwd(username, password);
		conn.commit();
		
		return user;
	}catch(Exception e){
		try {
			conn.rollback();
		} catch (SQLException e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
		}
		e.printStackTrace();
		throw new RuntimeException("登陆失败");
	}finally{
		try {
			JDBCUtil3.close(null, null, conn);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	
}

}
package servlet;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class A extends HttpServlet{
@Override
protected void service(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
// 从A servlet – B servlet

	PrintWriter out = response.getWriter();
	
	out.println("this is a servlet");
	
	//向request作用域存入数据
	request.setAttribute("rname", "rvalue");
	/**
	 * RequestDispatcher 他的作用就是 指定你要跳转(转发)到哪个servlet
	 */
	System.out.println("this is a servlet");
	//将请求转发到B servlet  
	RequestDispatcher rd = request.getRequestDispatcher("/B");
	rd.forward(request, response);
	
}

}
package servlet;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import service.AccountService;
import service.AccountServiceImpl;
import entity.Account;

public class AddAction extends HttpServlet{

@Override
protected void service(HttpServletRequest request, HttpServletResponse response)
		throws ServletException, IOException {
	//1.设置编码格式    获取客户端的数据
	request.setCharacterEncoding("utf-8");
	String username = request.getParameter("username");
	String password = request.getParameter("password");
	String balance = request.getParameter("balance");
	String mobile = request.getParameter("mobile");
	
	//将需要处理的数据进行转换
	double b = Double.parseDouble(balance);
	
	//2.调用业务功能  service
	AccountService as = new AccountServiceImpl();
	as.insertAccount(new Account(null,username,password,b,mobile));
	
	//3.页面跳转   
	response.sendRedirect("/servletday2/queryAction");
}

}
package servlet;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class AddView extends HttpServlet{

@Override
protected void service(HttpServletRequest request, HttpServletResponse response)
		throws ServletException, IOException {
	//设置响应的类型  编码格式
	response.setContentType("text/html");
	response.setCharacterEncoding("utf-8");
	request.setCharacterEncoding("utf-8");
	
	//获得输出流
	PrintWriter out = response.getWriter();
	out.println("<html><body>");
	out.println("<form action='/servletday2/addAction' method='post'>");
	out.println("用户名：<input type='text' name='username'><br/>");
	out.println("密码：<input type='password' name='password'><br/>");
	out.println("余额：<input type='text' name='balance'><br/>");
	out.println("电话：<input type='text' name='mobile'><br/>");
	out.println("<input type='submit' value='提交'>");
	out.println("<input type='reset' value='重置'><br/>");
	out.println("</form>");
	out.println("</body></html>");
	
	out.flush();
}

}
package servlet;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class B extends HttpServlet{
@Override
protected void service(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
System.out.println(“this is b servlet”);
//从request作用域取出一个命名属性值
String rvalue = (String)request.getAttribute(“rname”);

	//获取输出流
	PrintWriter out = response.getWriter();
	
	out.println("B servlet:"+rvalue);
	
}

}
package servlet;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**

类的作用：实现登陆验证
*/
public class LoginAction extends HttpServlet{
public LoginAction(){
System.out.println(“创建了 loginAction”);
}
public void service(HttpServletRequest request,HttpServletResponse response)
throws ServletException,IOException{
//设置编码
request.setCharacterEncoding(“utf-8”);
response.setCharacterEncoding(“utf-8”);
//设置响应类型
response.setContentType(“text/html”);

 //设置一个 cookie
 Cookie[] cookies = request.getCookies();
 if(cookies==null){
 	Cookie cookie = new Cookie("username","password");
 	cookie.setMaxAge(1200);
 	response.addCookie(cookie);
 	
 }
 
 
 
 //获取客户端的参数
 String username = request.getParameter("username");
 String password = request.getParameter("password");
 //如果 用户名和密码 都是 baizhi 那么 向页面输出 登陆成功  否则输出登陆失败
 //获取输出流
 PrintWriter out = response.getWriter();
 if("baizhi".equals(username) && "baizhi".equals(password)){
 	//页面跳转
 	response.sendRedirect("/servletday2/queryAction");

// out.println(“登陆成功！~”);
}else{
out.println(“登陆失败！~”);
}
out.flush();

}
package servlet;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import service.UserService;
import service.UserServiceImpl;
import entity.User;

public class LoginUserAction extends HttpServlet{
@Override
protected void service(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
//设置编码
request.setCharacterEncoding(“utf-8”);
response.setCharacterEncoding(“utf-8”);
//设置响应类型
response.setContentType(“text/html”);
//获取客户端参数
String username = request.getParameter(“username”);
String password = request.getParameter(“password”);
//调用service
UserService us = new UserServiceImpl();
User user = us.doLogin(username, password);

	//获取输出流
	PrintWriter out = response.getWriter();
	if(user == null){
		out.println("用户名或密码错误！~");
	}else{
		out.println("登陆成功，欢迎~"+user.getUsername());
	}
	out.flush();
}

}
package servlet;

import java.io.IOException;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import entity.Account;

import service.AccountService;
import service.AccountServiceImpl;

public class QueryAction extends HttpServlet{

@Override
protected void service(HttpServletRequest request, HttpServletResponse response)
		throws ServletException, IOException {
	//1.调用业务功能(获取客户端的数据)
	AccountService as = new AccountServiceImpl();
	List<Account> list = as.queryAccount();
	//2.向request作用域存入数据
	request.setAttribute("list", list);
	
	//3.页面跳转
	request.getRequestDispatcher("/queryView").forward(request, response);
	
}

}

package servlet;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;

import entity.Account;

public class QueryView extends HttpServlet{

@Override
protected void service(HttpServletRequest request, HttpServletResponse response)
		throws ServletException, IOException {
	PrintWriter out = response.getWriter();
	Cookie[] cookies = request.getCookies();
	if(cookies!=null){
		for (Cookie cookie : cookies) {
			out.println(cookie.getName()+"="+cookie.getValue());
		}
	}
	
	//1.到request中取出数据
	List<Account> list = (List<Account>) request.getAttribute("list");
	//2.获取输出流 向客户端输出结果
	response.setCharacterEncoding("utf-8");
	response.setContentType("text/html");


	out.println("<html><body>");
	out.println("<table border='2px' cellspacing='0' align='center'>");
	//表头
	out.println("<tr bgcolor='blue'>");
	out.println("<td>CARD_ID</td>");
	out.println("<td>USERNAME</td>");
	out.println("<td>PASSWORD</td>");
	out.println("<td>BALANCE</td>");
	out.println("<td>MOBILE</td>");
	out.println("<td>操作</td>");
	out.println("</tr>");

	//循环遍历list将数据显示在表格中
	for(Account acc:list){
		out.println("<tr>");
		out.println("<td>"+acc.getCard_id()+"</td>");
		out.println("<td>"+acc.getUsername()+"</td>");
		out.println("<td>"+acc.getPassword()+"</td>");
		out.println("<td>"+acc.getBalance()+"</td>");
		out.println("<td>"+acc.getMobile()+"</td>");
		out.println("<td>" +
				"<a href=''>update</a>&nbsp;" +
				"<a href=''>delete</a></td>");
		out.println("</tr>");
	}
	out.println("</table>");
	out.println("<center><a href='/servletday2/addView'>create account</a></center>");
	out.println("</body></html>");

	out.flush();
}

}
package servlet;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import entity.Account;

import service.AccountService;
import service.AccountServiceImpl;

public class ShowAllAccountServlet extends HttpServlet{
public void service(HttpServletRequest request,HttpServletResponse response)
throws ServletException,IOException{
//设置编码格式
request.setCharacterEncoding(“utf-8”);
response.setCharacterEncoding(“utf-8”);
//设置响应类型
response.setContentType(“text/html”);

	//调用AccountService
	AccountService as = new AccountServiceImpl();
	List<Account> list = as.queryAccount();
	//获得输出流 将结果响应到客户端
	
	PrintWriter out = response.getWriter();
	
	out.println("<html><body>");
	out.println("<table border='2px' cellspacing='0' align='center'>");
	//表头
	out.println("<tr bgcolor='blue'>");
	out.println("<td>CARD_ID</td>");
	out.println("<td>USERNAME</td>");
	out.println("<td>PASSWORD</td>");
	out.println("<td>BALANCE</td>");
	out.println("<td>MOBILE</td>");
	out.println("</tr>");
	
	//循环遍历list将数据显示在表格中
	for(Account acc:list){
		out.println("<tr>");
		out.println("<td>"+acc.getCard_id()+"</td>");
		out.println("<td>"+acc.getUsername()+"</td>");
		out.println("<td>"+acc.getPassword()+"</td>");
		out.println("<td>"+acc.getBalance()+"</td>");
		out.println("<td>"+acc.getMobile()+"</td>");
		out.println("</tr>");
	}
	out.println("</table>");
	out.println("</body></html>");
	
	out.flush();
}

}
package util;

import java.io.IOException;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.Properties;

/**

获取数据库的连接 Connection
*/
public class JDBCUtil3 {
//
private static Properties prop = new Properties();

//静态初始代码块 – 只在类加载的时候执行一次
static{
InputStream in = null;
//1.加载驱动
try {
//获得一个保存有jdbc.properties文件内容的输入流
in = JDBCUtil3.class.getResourceAsStream("/jdbc.properties");
//将输入流中的数据保存到Properties对象中
prop.load(in);
//通过键获得值
System.out.println(prop.getProperty(“driver”));
Class.forName(prop.getProperty(“driver”));
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
throw new RuntimeException(“加载驱动失败！~”);
}finally{
//关闭流
try {
in.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
private static ThreadLocal tol = new ThreadLocal();
//获取一个Connection
public static Connection getConnection() throws Exception{
//从当前线程取Connection 如果没有就创建一个
Connection conn = tol.get();
if(conn == null){
//2.获取Connection
conn = DriverManager.getConnection(prop.getProperty(“url”),
prop.getProperty(“username”),prop.getProperty(“password”));
tol.set(conn);
}
```
return conn;
```
}
//释放资源
public static void close(ResultSet rs,Statement stm,Connection conn) throws Exception{
```
if(rs!=null) {
	rs.close();
}
if(stm!=null) {
	stm.close();
}
if(conn!=null) {
	conn.close();
	tol.remove();
}
```
}
}

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