package com.zzw.dao;
import java.util.List;
import com.zzw.entity.Bill;
import com.zzw.entity.User;
public interface IUserDao {
//注册
public boolean Register(User user) ;
//查询账户是否存在
public boolean isExist(String uname) ;
//登录
public boolean Login(String uname,String upwd) ;
//根据帐号查询用户全部信息
public User Query(String uname) ;
//记账
public boolean AddBill(Bill bill);
//根据账目编号删除账目信息
public boolean DeleteBill(int bid);
//根据账目编号修改账目信息
public boolean UpdateBill(int bid,Bill bill) ;
//查询账目是否存在
public boolean isExist(int bid) ;
//根据账目编号查询账目信息
public Bill Query(int bid);
//根据消费类型查询账单信息
public List<Bill> QueryType(String btype);
//根据日期查询账单信息
public List<Bill> QueryDate(String bdate) ;
//根据消费类型和日期查询账单信息
public List<Bill> QueryPart(String btype,String bdate) ;
//查询全部账单信息
public List<Bill> QueryAll() ;
}
package com.zzw.dao.Impl;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import java.util.ArrayList;
import com.zzw.dao.IUserDao;
import com.zzw.entity.Bill;
import com.zzw.entity.User;
import com.zzw.utils.DBUtil;
public class UserDaoImpl implements IUserDao{
//注册
public boolean Register(User user) {
String sql="insert into user(uname,upwd,usex) values(?,?,?)" ;
Object [] params= {user.getUname(),user.getUpwd(),user.getUsex()};
return DBUtil.executeUpdate(sql, params);
}
//查询账户是否存在
public boolean isExist(String uname) {
return Query(uname)==null? false:true;
}
//登录
public boolean Login(String uname,String upwd) {
return Query(uname,upwd)==null? false:true;
}
//根据账号查询用户全部信息
public User Query(String uname) {
User user= null;
ResultSet rs = null;
try {
String sql="select * from user where uname =?" ;
Object [] params= {uname};
rs=DBUtil.executeQuery(sql, params);
if(rs.next()) {
String name=rs.getString("uname");
String pwd=rs.getString("upwd");
String sex=rs.getString("usex");
user= new User(name,pwd,sex);
}
}catch(SQLException e) {
e.printStackTrace();
}catch(Exception e) {
e.printStackTrace();
}finally {
try {
//先开的后关，后开的先关
if(rs!=null)rs.close();
if(DBUtil.pstmt!=null)DBUtil.pstmt.close();
if(DBUtil.connection !=null)DBUtil.connection.close();
}catch(SQLException e) {
e.printStackTrace();
}finally {
}
}
return user;
}
//根据账户密码确定是否存在
public User Query(String uname,String upwd) {
User user= null;
ResultSet rs = null;
try {
String sql="select * from user where uname =? and upwd=?" ;
Object [] params= {uname,upwd};
rs=DBUtil.executeQuery(sql, params);
if(rs.next()) {
String name=rs.getString("uname");
String pwd=rs.getString("upwd");
String sex=rs.getString("usex");
user= new User(name,pwd,sex);
}
}catch(SQLException e) {
e.printStackTrace();
}catch(Exception e) {
e.printStackTrace();
}finally {
try {
//先开的后关，后开的先关
if(rs!=null)rs.close();
if(DBUtil.pstmt!=null)DBUtil.pstmt.close();
if(DBUtil.connection !=null)DBUtil.connection.close();
}catch(SQLException e) {
e.printStackTrace();
}finally {
}
}
return user;
}
//记账
public boolean AddBill(Bill bill) {
String sql="insert into bill(btype,bmoney,bdate,bremark) values(?,?,?,?)" ;
Object [] params= {bill.getBtype(),bill.getBmoney(),bill.getBdate(),bill.getBremark()};
return DBUtil.executeUpdate(sql, params);
}
//根据账目编号删除账目信息
public boolean DeleteBill(int bid) {
String sql="delete from bill where bid=?" ;
Object [] params= {bid};
return DBUtil.executeUpdate(sql, params);
}
//根据账目编号修改账目信息
public boolean UpdateBill(int bid,Bill bill) {
String sql="update bill set btype =?,bmoney=?,bdate=?,bremark=? where bid =?" ;
Object [] params= {bill.getBtype(),bill.getBmoney(),bill.getBdate(),bill.getBremark(),bid};
return DBUtil.executeUpdate(sql, params);
}
//查询账目是否存在
public boolean isExist(int bid) {
return Query(bid)==null? false:true;
}
//根据账目编号查询账目信息
public Bill Query(int bid) {
Bill bill= null;
ResultSet rs = null;
try {
String sql="select * from bill where bid =? " ;
Object [] params= {bid};
rs=DBUtil.executeQuery(sql, params);
if(rs.next()) {
int id=rs.getInt("bid");
String type=rs.getString("btype");
int money=rs.getInt("bmoney");
String date=rs.getString("bdate");
String remark=rs.getString("bremark");
bill=new Bill(id,type,money,date,remark);
}
}catch(SQLException e) {
e.printStackTrace();
}catch(Exception e) {
e.printStackTrace();
}finally {
try {
//先开的后关，后开的先关
if(rs!=null)rs.close();
if(DBUtil.pstmt!=null)DBUtil.pstmt.close();
if(DBUtil.connection !=null)DBUtil.connection.close();
}catch(SQLException e) {
e.printStackTrace();
}finally {
}
}
return bill;
}
//根据消费类型查询账单信息
public List<Bill> QueryType(String btype) {
List<Bill> bills = new ArrayList<>();
Bill bill= null;
ResultSet rs=null;
try {
String sql="select * from bill where btype=?" ;
Object [] params= {btype};
rs=DBUtil.executeQuery(sql, params);
while(rs.next()) {
int id=rs.getInt("bid");
String type= rs.getString("btype");
int money=rs.getInt("bmoney");
String date= rs.getString("bdate");
String remark= rs.getString("bremark");
bill= new Bill(id,type,money,date,remark);
bills.add(bill);
}
}catch(SQLException e) {
e.printStackTrace();
}catch(Exception e) {
e.printStackTrace();
}finally {
try {
//先开的后关，后开的先关
if(rs!=null)rs.close();
if(DBUtil.pstmt!=null)DBUtil.pstmt.close();
if(DBUtil.connection !=null)DBUtil.connection.close();
}catch(SQLException e) {
e.printStackTrace();
}finally {
}
}
return bills;
}
//根据日期查询账单信息
public List<Bill> QueryDate(String bdate) {
List<Bill> bills = new ArrayList<>();
Bill bill= null;
ResultSet rs=null;
try {
String sql="select * from bill where bdate=?" ;
Object [] params= {bdate};
rs=DBUtil.executeQuery(sql, params);
while(rs.next()) {
int id=rs.getInt("bid");
String type= rs.getString("btype");
int money=rs.getInt("bmoney");
String date= rs.getString("bdate");
String remark= rs.getString("bremark");
bill= new Bill(id,type,money,date,remark);
bills.add(bill);
}
}catch(SQLException e) {
e.printStackTrace();
}catch(Exception e) {
e.printStackTrace();
}finally {
try {
//先开的后关，后开的先关
if(rs!=null)rs.close();
if(DBUtil.pstmt!=null)DBUtil.pstmt.close();
if(DBUtil.connection !=null)DBUtil.connection.close();
}catch(SQLException e) {
e.printStackTrace();
}finally {
}
}
return bills;
}
//根据消费类型和日期查询账单信息
public List<Bill> QueryPart(String btype,String bdate) {
List<Bill> bills = new ArrayList<>();
Bill bill= null;
ResultSet rs=null;
try {
String sql="select * from bill where btype=?and bdate=?" ;
Object [] params= {btype,bdate};
rs=DBUtil.executeQuery(sql, params);
while(rs.next()) {
int id=rs.getInt("bid");
String type= rs.getString("btype");
int money=rs.getInt("bmoney");
String date= rs.getString("bdate");
String remark= rs.getString("bremark");
bill= new Bill(id,type,money,date,remark);
bills.add(bill);
}
}catch(SQLException e) {
e.printStackTrace();
}catch(Exception e) {
e.printStackTrace();
}finally {
try {
//先开的后关，后开的先关
if(rs!=null)rs.close();
if(DBUtil.pstmt!=null)DBUtil.pstmt.close();
if(DBUtil.connection !=null)DBUtil.connection.close();
}catch(SQLException e) {
e.printStackTrace();
}finally {
}
}
return bills;
}
//查询全部账单信息
public List<Bill> QueryAll() {
List<Bill> bills = new ArrayList<>();
Bill bill= null;
ResultSet rs=null;
try {
String sql="select * from bill " ;
rs=DBUtil.executeQuery(sql, null);
while(rs.next()) {
int id=rs.getInt("bid");
String type= rs.getString("btype");
int money=rs.getInt("bmoney");
String date= rs.getString("bdate");
String remark= rs.getString("bremark");
bill= new Bill(id,type,money,date,remark);
bills.add(bill);
}
}catch(SQLException e) {
e.printStackTrace();
}catch(Exception e) {
e.printStackTrace();
}finally {
try {
//先开的后关，后开的先关
if(rs!=null)rs.close();
if(DBUtil.pstmt!=null)DBUtil.pstmt.close();
if(DBUtil.connection !=null)DBUtil.connection.close();
}catch(SQLException e) {
e.printStackTrace();
}finally {
}
}
return bills;
}
}
package com.zzw.entity;
public class Bill {
private int bid;
private String btype;
private int bmoney;
private String bdate;
private String bremark;
public Bill() {
}
public Bill(int bmoney, String bdate, String bremark) {
this.bmoney = bmoney;
this.bdate = bdate;
this.bremark = bremark;
}
public Bill(String btype, int bmoney, String bdate, String bremark) {
this.btype = btype;
this.bmoney = bmoney;
this.bdate = bdate;
this.bremark = bremark;
}
public Bill(int bid, String btype, int bmoney, String bdate, String bremark) {
this.bid = bid;
this.btype = btype;
this.bmoney = bmoney;
this.bdate = bdate;
this.bremark = bremark;
}
@Override
public String toString() {
return "Bill [bid=" + bid + ", btype=" + btype + ", bmoney=" + bmoney + ", bdate=" + bdate + ", bremark="
+ bremark + "]";
}
public int getBid() {
return bid;
}
public void setBid(int bid) {
this.bid = bid;
}
public String getBtype() {
return btype;
}
public void setBtype(String btype) {
this.btype = btype;
}
public int getBmoney() {
return bmoney;
}
public void setBmoney(int bmoney) {
this.bmoney = bmoney;
}
public String getBdate() {
return bdate;
}
public void setBdate(String bdate) {
this.bdate = bdate;
}
public String getBremark() {
return bremark;
}
public void setBremark(String bremark) {
this.bremark = bremark;
}
}
package com.zzw.entity;
public class User {
private int uid;
private String uname;
private String upwd;
private String usex;
@Override
public String toString() {
return "User [uid=" + uid + ", uname=" + uname + ", upwd=" + upwd + ", usex=" + usex + "]";
}
public User() {
}
public User( String uname, String upwd) {
this.uname = uname;
this.upwd = upwd;
}
public User( String uname, String upwd, String usex) {
this.uname = uname;
this.upwd = upwd;
this.usex = usex;
}
public User(int uid, String uname, String upwd, String usex) {
this.uid = uid;
this.uname = uname;
this.upwd = upwd;
this.usex = usex;
}
public int getUid() {
return uid;
}
public void setUid(int uid) {
this.uid = uid;
}
public String getUname() {
return uname;
}
public void setUname(String uname) {
this.uname = uname;
}
public String getUpwd() {
return upwd;
}
public void setUpwd(String upwd) {
this.upwd = upwd;
}
public String getUsex() {
return usex;
}
public void setUsex(String usex) {
this.usex = usex;
}
}
package com.zzw.service;
import java.util.List;
import com.zzw.entity.Bill;
import com.zzw.entity.User;
public interface IUserService {
//登录
public boolean Login(User user);
//注册
public boolean Register(User user) ;
//根据账号查询用户
public User Query(String uname) ;
//记账
public boolean AddBill(Bill bill) ;
//根据账目编号进行删除
public boolean DeleteBill(int bid);
//根据账目编号进行修改
public boolean UpdateBill(int bid,Bill bill) ;
//根据账目编号查询账目
public Bill Query(int bid) ;
//根据消费类型查询账单信息
public List<Bill> QueryType(String btype);
//根据日期查询账单信息
public List<Bill> QueryDate(String bdate) ;
//根据消费类型和日期查询账单信息
public List<Bill> QueryPart(String btype,String bdate) ;
//查询全部账单信息
public List<Bill> QueryAll() ;
}
package com.zzw.service.Impl;
import java.util.List;
import com.zzw.dao.IUserDao;
import com.zzw.dao.Impl.UserDaoImpl;
import com.zzw.entity.Bill;
import com.zzw.entity.User;
import com.zzw.service.IUserService;
public class UserServiceImpl implements IUserService{
IUserDao userdao= new UserDaoImpl();
//登录
public boolean Login(User user) {
boolean flag=false;
if(userdao.Login(user.getUname(),user.getUpwd())) {
flag=true;
}
return flag;
}
//注册
public boolean Register(User user) {
boolean flag=false;
if(!userdao.isExist(user.getUname())) {
userdao.Register(user);
flag=true;
}else {
System.out.println("此人已存在");
}
return flag;
}
//根据账号查询用户
public User Query(String uname) {
return userdao.Query(uname);
}
//记账
public boolean AddBill(Bill bill) {
boolean flag=false;
if(userdao.AddBill(bill)) {
flag=true;
}
return flag;
}
//根据账目编号进行删除
public boolean DeleteBill(int bid) {
boolean flag=false;
if(userdao.isExist(bid)) {
userdao.DeleteBill(bid);
flag=true;
}else {
System.out.println("此账目不存在");
}
return flag;
}
package com.zzw.utils;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
public class DBUtil {
//数据库URL和账号密码
private static final String URL="jdbc:mysql://localhost:3306/bookkeeping?serverTimezone=UTC&characterEncoding=utf-8";
private static final String UNAME="root";
private static final String UPWD="vayne";
public static PreparedStatement pstmt=null;
public static ResultSet rs = null;
public static Connection connection=null;
//增删改
public static boolean executeUpdate(String sql,Object [] params) {
boolean flag = false;
try {
//a.导入驱动，加载具体的驱动类
Class.forName("com.mysql.cj.jdbc.Driver");
//b.与数据库建立连接
connection = DriverManager.getConnection(URL,UNAME,UPWD);
pstmt = connection.prepareStatement(sql);
for(int i=0;i<params.length;i++) {
pstmt.setObject(i+1, params[i]);
}
int count=pstmt.executeUpdate();//返回值表示，增删改几条数据
//处理结果
if(count>0)
{
System.out.println("操作成功！！！");
flag=true;
}
}catch(ClassNotFoundException e) {
e.printStackTrace();
}catch(SQLException e) {
e.printStackTrace();
}catch(Exception e){
e.printStackTrace();
}finally {
try {
//先开的后关，后开的先关
if(pstmt!=null)pstmt.close();
if(connection !=null)connection.close();
}catch(SQLException e) {
e.printStackTrace();
}finally {
}
}
return flag;
}
//查
public static ResultSet executeQuery(String sql,Object [] params) {
try {
//a.导入驱动，加载具体的驱动类
Class.forName("com.mysql.cj.jdbc.Driver");
//b.与数据库建立连接
connection = DriverManager.getConnection(URL,UNAME,UPWD);
pstmt = connection.prepareStatement(sql);
if(params!=null) {
for(int i=0;i<params.length;i++) {
pstmt.setObject(i+1, params[i]);
}
}
rs = pstmt.executeQuery();
return rs;
}catch(ClassNotFoundException e) {
e.printStackTrace();
return null;
}catch(SQLException e) {
e.printStackTrace();
return null;
}catch(Exception e){
e.printStackTrace();
return null;
}
}
}
以上是家庭记账本的后台的登陆部分等基本servlet
来源：https://www.cnblogs.com/520520520zl/p/12287511.html