事务实现转账功能

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dao

ackage cn.hahaha.bank.dao;

import cn.hahaha.bank.javabean.User;
import cn.hahaha.bank.utils.C3P0_utils;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanHandler;

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

public class BankDao {
    public boolean judgeDao(User user){
        Connection con = C3P0_utils.getConnection();
        QueryRunner qr = new QueryRunner();
        User query = null;
        try {
            query = qr.query(con, "select * from bank where uname = ? and password = ?", new BeanHandler(User.class), user.getName(), user.getPassword());
        return true;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return false;
    }
    public boolean judgeDao(String name){
        Connection con = C3P0_utils.getConnection();
        QueryRunner qr = new QueryRunner();
        User query = null;
        try {
            query = qr.query(con, "select * from bank where uname = ?", new BeanHandler(User.class), name);
            if (query==null){
                return false;
            }else {
                return true;
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return false;
    }

//    public void transfer(User u, String name1, Double money) throws SQLException {
//
//
//    }
    public void outMoney(User user,Double money){
        Connection con = C3P0_utils.getConnection();
        QueryRunner qr = new QueryRunner();
        try {
            qr.update(con, "update bank set money = money - ? where uname = ?", money, user.getName());
        } catch (SQLException e) {
            e.printStackTrace();
        }

    }
    public void inMoney(String name,Double money){

        QueryRunner qr = new QueryRunner();
        try {
            Connection con = C3P0_utils.getConnection();
            qr.update(con, "update bank set money = money + ? where uname = ?", money, name);
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}

domain

package cn.hahaha.bank.domain;

import cn.hahaha.bank.dao.BankDao;
import cn.hahaha.bank.javabean.User;

import cn.hahaha.bank.service.AccountService;
import org.apache.commons.dbutils.DbUtils;

import java.util.Scanner;

public class Bank {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        Scanner sc1 = new Scanner(System.in);

        System.out.println("请输入用户名：");
        String name = sc.nextLine();
        System.out.println("请输入密码：");
        int password = sc1.nextInt();
        User user = new User(name,password,0);
        BankDao bankDao = new BankDao();
        boolean b = bankDao.judgeDao(user);
        if (b){
            account(user);
        }


    }
    public static void account(User user){
        System.out.println("-----请选择接下来所要进行的操作：-----");
        System.out.println("-----1.转账");
        System.out.println("-----其他业务待定。。。");
        Scanner sc = new Scanner(System.in);
        Scanner sc1 = new Scanner(System.in);
        int chose = sc.nextInt();
        if (chose == 1){
            System.out.println("请输入要转的人姓名：");
            String name1 = sc1.nextLine();
            BankDao bankDao = new BankDao();
            boolean b = bankDao.judgeDao(name1);
            if (b){
                System.out.println("请输入转的金额：");
                Double money = sc.nextDouble();
                AccountService as = new AccountService();
                as.transfer(user,name1,money);
                System.out.println("操作已完成！");
            }else{
                System.out.println("不存在此用户！");
            }
        }
    }
}

javabean

package cn.hahaha.bank.javabean;

public class User {
    private String name;
    private int password;
    private double money;

    public User() {
    }

    public User(String name, int password, double money) {
        this.name = name;
        this.password = password;
        this.money = money;
    }

    @Override
    public String toString() {
        return "User{" +
                "name='" + name + '\'' +
                ", password=" + password +
                ", money=" + money +
                '}';
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getPassword() {
        return password;
    }

    public void setPassword(int password) {
        this.password = password;
    }

    public double getMoney() {
        return money;
    }

    public void setMoney(double money) {
        this.money = money;
    }
}

service

package cn.hahaha.bank.service;

import cn.hahaha.bank.dao.BankDao;
import cn.hahaha.bank.javabean.User;
import cn.hahaha.bank.utils.C3P0_utils;
import org.apache.commons.dbutils.DbUtils;

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

public class AccountService {
    public void transfer(User u, String name1, Double money){
        Connection connection = C3P0_utils.getConnection();
        try {
            connection.setAutoCommit(false);
            BankDao bankDao = new BankDao();
            bankDao.outMoney(u,money);
//            int i=1/0;
            bankDao.inMoney(name1,money);
            DbUtils.commitAndCloseQuietly(connection);
            System.out.println("操作完成！");
        } catch (SQLException e) {
            DbUtils.rollbackAndCloseQuietly(connection);
            e.printStackTrace();
            System.out.println("操作失败！");
        }

    }
}

utils

package cn.hahaha.bank.utils;

import com.mchange.v2.c3p0.ComboPooledDataSource;

import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.SQLException;

public class C3P0_utils {
    public static DataSource ds = new ComboPooledDataSource();
    static ThreadLocal t1 = new ThreadLocal();

    public static Connection getConnection() {
        try {
            Connection con = t1.get();
            if (con == null) {
                con = ds.getConnection();
                t1.set(con);
                con = t1.get();
            }
            return con;
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
}

以上代码比较完整，需要导入jar包，配置xml文件，如有问题，可找我，我可发完整代码jar包和配置文件，在此留下微信：jl372444090，如有疑问可联系，但请注明缘由，负责不予理会。