标签:gconf logo out wired 方法 imp autowired dao man
首先是保存实体类信息的entity层:
package edu.youzg.entity;
public class UserInfo {
private int id;
private String name;
private String password;
private float balance;
public UserInfo() {
}
public UserInfo(String name) {
this.name = name;
}
public UserInfo(String name, String password) {
this.password = password;
this.name = name;
}
public UserInfo(int id, String name, int balance) {
this.id = id;
this.name = name;
this.balance = balance;
}
public UserInfo(int id, String name, String password, int balance) {
this.id = id;
this.name = name;
this.password = password;
this.balance = balance;
}
public int getId() {
return id;
}
public UserInfo setId(int id) {
this.id = id;
return this;
}
public String getName() {
return name;
}
public UserInfo setName(String name) {
this.name = name;
return this;
}
public String getPassword() {
return password;
}
public UserInfo setPassword(String password) {
this.password = password;
return this;
}
public float getBalance() {
return balance;
}
public UserInfo setBalance(float balance) {
this.balance = balance;
return this;
}
@Override
public String toString() {
StringBuffer str = new StringBuffer();
str.append("账户[").append(name).append("]目前余额为:[").append(balance).append("]元");
return str.toString();
}
}
接下来是联系数据库的dao层:
package edu.youzg.dao;
import edu.youzg.entity.UserInfo;
public interface IUserDao {
void saveUser(String name, String password);
void updateInfo(String name, String password, int id);
void updateBalance(int id, float deltaMoney);
UserInfo queryByLoginName(String name);
UserInfo queryByID(int id);
void deleteUser(String name, int id);
}
package edu.youzg.dao;
import edu.youzg.entity.UserInfo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.stereotype.Repository;
import java.util.List;
/**
* 用户的数据库访问类
*/
@Repository
public class UserDao implements IUserDao {
@Autowired
private JdbcTemplate jt;
@Override
public void saveUser(String name, String password) {
String sql = "insert into account(name, password, balance) values(?, ?, ?)";
jt.update(sql, name, password, 0);
}
@Override
public void updateInfo(String name, String password, int id) {
String sql = "update account set name=?, password=? where id=?";
jt.update(sql, name, password, id);
}
@Override
public void updateBalance(int id, float deltaMoney) {
String sql = "update account set balance=balance+? where id=?";
jt.update(sql, deltaMoney, id);
}
@Override
public UserInfo queryByLoginName(String name) {
String sql = "select * from account where name=? ";
List<UserInfo> list = jt.query(sql, new BeanPropertyRowMapper<UserInfo>(UserInfo.class), name);
if (list!=null && list.size()>=1){
return list.get(0);
}
return null;
}
@Override
public UserInfo queryByID(int id) {
String sql="select * from account where id=?";
//返回一条数据
// return jt.queryForObject(sql,new BeanPropertyRowMapper<UserInfo>(UserInfo.class),name);
List<UserInfo> list = jt.query(sql, new BeanPropertyRowMapper<UserInfo>(UserInfo.class), id);
if(list!=null && list.size()>=1){
return list.get(0);
}
return null;
}
@Override
public void deleteUser(String name, int id) {
String sql = "delete from account where name=? and id=?";
jt.update(sql, name, id);
}
}
然后是提供对外功能的service层:
package edu.youzg.service;
import edu.youzg.entity.UserInfo;
/**
* @Author: Youzg
* @CreateTime: 2020-05-05 10:06
* @Description:带你深究Java的本质!
*/
public interface IUserService {
// 用户功能
UserInfo register(UserInfo user);
UserInfo login(UserInfo user);
void saveMoney(UserInfo user, float money);
boolean withdrawMonney(UserInfo user, float money);
float queryBalance(UserInfo user);
void transfer(UserInfo fromUser, UserInfo toUser, float money);
// 管理员功能
void deleteUser(UserInfo user);
}
package edu.youzg.service;
import edu.youzg.dao.IUserDao;
import edu.youzg.entity.UserInfo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
/**
* 用户业务逻辑
*/
@Transactional //添加 事务控制
@Service("userService")
public class UserService implements IUserService {
//数据库访问对象
@Autowired
private IUserDao dao;
@Override
public UserInfo register(UserInfo user) {
String name = user.getName();
String pass = user.getPassword();
UserInfo userInfo = dao.queryByLoginName(name);
if (null!=userInfo) {
System.out.println("用户名已存在!");
return new UserInfo().setId(-1);
}
dao.saveUser(name, pass);
// 获取id,以便上层处理
UserInfo res = dao.queryByLoginName(name);
return res;
}
@Override
public UserInfo login(UserInfo user) {
UserInfo userInfo = dao.queryByLoginName(user.getName());
if (userInfo.getId() > 0) {
return userInfo;
}
return null;
}
@Override
public void saveMoney(UserInfo user, float money) {
UserInfo userInfo = dao.queryByLoginName(user.getName());
if (null==userInfo || userInfo.getId() <= 0) {
return;
}
dao.updateBalance(userInfo.getId(), money);
}
@Override
public boolean withdrawMonney(UserInfo user, float money) {
UserInfo userInfo = dao.queryByLoginName(user.getName());
if (null == userInfo || userInfo.getBalance() < money) {
return false;
}
dao.updateBalance(userInfo.getId(), -money);
return true;
}
@Override
public float queryBalance(UserInfo user) {
UserInfo userInfo = dao.queryByLoginName(user.getName());
if (null == userInfo) {
return -1;
}
return userInfo.getBalance();
}
@Override
public void deleteUser(UserInfo user) {
UserInfo userInfo = dao.queryByLoginName(user.getName());
if (null == userInfo) {
return;
}
dao.deleteUser(userInfo.getName(), userInfo.getId());
}
// 转账业务逻辑
@Override
public void transfer(UserInfo fromUser, UserInfo toUser, float money) {
UserInfo from = dao.queryByLoginName(fromUser.getName());
UserInfo to = dao.queryByLoginName(toUser.getName());
if (null==from || null==to) {
return;
}
//账号-钱
dao.updateBalance(from.getId(), -money);
//账号+钱
dao.updateBalance(to.getId(), money);
}
}
接下来是运用了aop技术、用于日志管理的切面层:
package edu.youzg.aspect;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;
import org.springframework.stereotype.Component;
@Component
@Aspect
public class LoggerAspect {
@Pointcut("execution(* edu.youzg.service.*.*(..))")
public void pointCut(){}
@Around("pointCut()")
public Object around(ProceedingJoinPoint pjp) throws Throwable {
Object result = null;
long stime = System.currentTimeMillis();
try {
result = pjp.proceed(pjp.getArgs());//执行目标业务逻辑
} finally {
long etime = System.currentTimeMillis();
long time = etime - stime; //方法执行耗时时间
String mname = pjp.getSignature().getName();
String cname = pjp.getTarget().getClass().getName();
//输出什么类,什么方法,什么时间,什么参数被执行了
String msg = String.format("类名:" + cname + "方法名:" + mname + "执行耗时(毫秒):" + time);
System.out.println(msg);
}
return result;
}
}
最后是用于配置spring、开启各种注解扫描的配置层:
package edu.youzg.config;
import com.alibaba.druid.pool.DruidDataSource;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.*;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
import org.springframework.transaction.annotation.EnableTransactionManagement;
import javax.sql.DataSource;
/**
* 使用java类配置spring
*/
@Configuration//声明这是spring配置类
@ComponentScan("edu.youzg")//扫描包
@EnableAspectJAutoProxy//开启aop注解支持
@PropertySource("youzgDB.properties")//读取配置文件
@EnableTransactionManagement//开启事务解析器
public class SpringConfig {
@Value("${db.username}")
private String userName;
@Value("${db.password}")
private String passWord;
@Value("${db.url}")
private String url;
@Value("${db.driverClassName}")
private String driverClassName;
// 创建数据源
@Bean
public DruidDataSource getDruidDataSource(){
DruidDataSource ds=new DruidDataSource();
ds.setUsername(userName);
ds.setPassword(passWord);
ds.setUrl(url);
ds.setDriverClassName(driverClassName);
//更多数据库连接池调优参数 根据官方文档设置即可
return ds;
}
//创建jdbc模板类对象
@Bean
public JdbcTemplate getJdbcTemplate(DataSource ds){
return new JdbcTemplate(ds);
}
//创建事务管理器
@Bean
public DataSourceTransactionManager getDataSourceTransactionManager(DataSource ds){
return new DataSourceTransactionManager(ds);
}
}
db.driverClassName=com.mysql.jdbc.Driver
db.url=jdbc:mysql://localhost:3306/dbstudy?serverTimezone=UTC&characterEncoding=utf-8
db.username=root
db.password=123456
最后,本人来给出测试类:
package edu.youzg.test;
import edu.youzg.config.SpringConfig;
import edu.youzg.dao.TransferDao;
import edu.youzg.entity.UserInfo;
import edu.youzg.service.IUserService;
import edu.youzg.service.UserService;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
/**
* @Author: Youzg
* @CreateTime: 2020-05-03 08:50
* @Description:带你深究Java的本质!
*/
public class YouzgTest {
public static void main(String[] args) {
ApplicationContext context = new AnnotationConfigApplicationContext(SpringConfig.class);
IUserService service = context.getBean("userService", IUserService.class);
UserInfo newUser = new UserInfo("youzg666", "123456");
service.register(newUser);
service.saveMoney(newUser, 100);
service.transfer(newUser, new UserInfo("youzg"), 20);
}
}
接下来,本人来展示下运行结果:
标签:gconf logo out wired 方法 imp autowired dao man
原文地址:https://www.cnblogs.com/codderYouzg/p/12830495.html