基于mysql的java管理系统
本帖最后由 starry、星空 于 2021-6-26 13:23 编辑用到的技术主要就是mysql,idworker,雪花算法生成唯一的id,
这个管理系统是一个学生找我帮它做的,电脑放太久了,删除了也不太好,就分享出来吧,就一个命令行的管理系统,
还没用到maven依赖,也没有用到一些spring的框架,也没写前端页面,挺简单的一个管理系统,
主方法
package main.java;
import com.manageSystem.pojo.t_user;
import main.java.com.manageSystem.pojo.t_orderitem;
import main.java.com.manageSystem.pojo.t_orders;
import main.java.com.manageSystem.service.Service;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
public class main {
private static Scanner scanner = new Scanner(System.in);
privatestatic t_user user;//用户信息保存
private static String []argsSave={};
public static void main(String[] args) throws Exception {
argsSave=args;
System.out.println("---------欢迎来到商品管理系统---------------------\n" +
"1 用户登录\n" +
"2 用户注册\n" +
"3 退出系统\n" +
"请输入选择:");
int i = scanner.nextInt();
switch (i){
case 1:Login();
break;
case 2:signUp();
break;
case 3:exitSytem();
break;
}
}
//退出系统
private static void exitSytem() {
System.exit(0);
}
//用户注册
private static void signUp() throws Exception {
System.out.println("请输入用户名:");
String username = scanner.next();
System.out.println("请输入密码:");
String password = scanner.next();
try {
new Service().addUser(username,password);
System.out.println("注册成功");
}catch (Exception e){
System.out.println("注册失败");
}finally {
main(argsSave);
}
}
//用户登录
private static void Login() throws Exception {
System.out.println("请输入用户名:");
String username = scanner.next();
System.out.println("请输入密码:");
String password = scanner.next();
try {
user= new Service().findUser(username, password);
if(user!=null){
System.out.println(user);
System.out.println("登录成功");
manageSystem();
}else {
System.out.println("账号或密码不存在,请重新输入");
main(argsSave);
}
}catch (Exception e){
e.printStackTrace();
}
}
//商品管理模块
private static void manageSystem() throws Exception {
System.out.println("-----------进入到商品管理模块-----------------\n" +
"1 商品查询\n" +
"2 商品修改\n" +
"3 商品删除\n" +
"4 商品添加\n" +
"5 商品购买\n" +
"6 查询用户订单\n" +
"7 退出当前用户");
int i = scanner.nextInt();
switch (i){
case 1:
findGoods();
break;
case 2:
editGoods();
break;
case 3:
deleteGoods();
break;
case 4:
addGoods();
break;
case 5:
buyGoods();
break;
case 6:
findUserOrderItems();
break;
case 7:
user=null;
main(argsSave);
break;
}
}
//查询用户订单
private static void findUserOrderItems() throws Exception {
List<t_orderitem> userOrderItems = Service.findUserOrderItems(user);
ArrayList<t_orders> userOrders = Service.findUserOrders(user);
for (int i = 0; i < userOrderItems.size(); i++) {
System.out.println("订单项id"+userOrderItems.get(i).getoItemid());
System.out.println("总金额"+userOrderItems.get(i).getoSubtotal());
System.out.println("下单个数"+userOrderItems.get(i).getoCount());
System.out.println("单价:"+userOrders.get(i).getoTotal());
System.out.println("商品名字:"+userOrders.get(i).getoName());
}
manageSystem();
}
//商品添加
private static void addGoods() throws Exception {
System.out.println("请输入你要添加的商品名字:");
String name = scanner.next();
System.out.println("请输入你要添加的商品价格:");
Double price = scanner.nextDouble();
System.out.println("请输入你要添加的商品的状态:0为删除,1为正常");
Integer status = scanner.nextInt();
try {
Service.addGoods(name,price,status);
System.out.println("添加成功");
}catch (Exception e){
e.printStackTrace();
System.out.println("添加失败");
}finally {
manageSystem();
}
}
//商品购买
private static void buyGoods() throws Exception {
System.out.println("请输入要购买的商品名称:");
String next = scanner.next();
System.out.println("请输入商品数量:");
int i = scanner.nextInt();
System.out.println("是否提交订单 y or n (提示:输入n:继续提示:请输入要购买的商品名称、请输入要购买的数量)");
String next1 = scanner.next();
switch (next1){
case "y":
Service.addGoodsOrder(next,i,user);
manageSystem();
break;
case "n":
buyGoods();
break;
}
}
//商品删除
private static void deleteGoods() {
}
//商品修改
private static void editGoods() throws Exception {
System.out.println("请选择修改选项：\n" +
"1 修改名称\n" +
"2 修改价格\n" +
"3 修改商品描述\n" +
"4 退到上一层菜单");
int i = scanner.nextInt();
switch (i){
case 4:manageSystem();
break;
}
}
//商品查询
private static void findGoods() throws Exception {
System.out.println("请选择查询选项：\n" +
"1 根据商品id查询:\n" +
"2 根据商品名称查询(模糊查询)\n" +
"3 退到上一层菜单");
int i = scanner.nextInt();
switch (i){
case 3:manageSystem();
break;
}
}
}
Dao层,也就是数据操作层
package main.java.com.manageSystem.dao;
import com.manageSystem.pojo.t_user;
import main.java.com.manageSystem.pojo.t_orderitem;
import main.java.com.manageSystem.pojo.t_orders;
import main.java.com.manageSystem.pojo.t_product;
import main.java.com.manageSystem.util.IdWorker;
import main.java.com.manageSystem.util.jdbcUtil;
import org.junit.Test;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.UUID;
public class manageSystemDao {
public static com.manageSystem.pojo.t_user findUser(String username, String password) throws Exception {
//4.获取执行者对象
t_user user = new t_user();
Connection con = jdbcUtil.getCon();
con.setTransactionIsolation(2);
Statement stat = con.createStatement();
//5.执行sql语句，并且接收结果
String sql = "SELECT * FROM t_user WHERE u_name='"+username+"' and u_password='"+password+"'";
System.out.println(sql);
ResultSet rs = stat.executeQuery(sql);
while (rs.next()){
user.setuId( rs.getInt("u_id"));
user.setuName(rs.getString("u_name"));
user.setuPassword( rs.getString("u_password"));
user.setuAddtime( rs.getDate("u_addtime"));
user.setuStatus( rs.getByte("u_status"));
user.setuEmail( rs.getString("u_email"));
user.setuTelephone( rs.getString("u_telephone"));
user.setuTruename( rs.getString("u_truename"));
user.setuBirthday( rs.getDate("u_birthday"));
user.setuActivecode=1( rs.getString("u_activecode=1"));
return user;
}
jdbcUtil.close(con,stat,rs);
return null;
}
public static void addGoodsOrder(String next, int i, t_user user) throws SQLException {
//4.获取执行者对象
Connection con = jdbcUtil.getCon();
Statement stat = con.createStatement();
con.setTransactionIsolation(2);
//5.执行sql语句，并且接收结果
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
String format = simpleDateFormat.format(new Date());//当前时间
String uuid = UUID.randomUUID().toString();
String substring = uuid.replace("-", "");//32位随机订单号
String replace = substring.substring(1, substring.length() - 10);
String s = user.getuName();//u_name
Integer integer = user.getuId();//u_id
String s1 = user.getuTelephone();
String sql = "INSERT INTO t_orders(o_id,o_ordertime,o_total,o_state,o_address,o_name,o_telephone,u_id) VALUES('"+replace+"','"+format+"',(SELECT pro_price FROM t_product WHERE pro_name='"+next+"'),'1','beijing','"+next+"','"+s1+"','"+integer+"')";
stat.execute(sql);
System.out.println(sql);
t_product t_product = queryProduct(next,con,stat);
Double proPrice = t_product.getProPrice();//获得价格
double sum=proPrice*(double) i;//总价
Integer proId = t_product.getProId();
uuid = uuid.substring(1, 6);
insertOrderItem(replace,i,sum,proId,con,stat,replace);
jdbcUtil.close(con,stat);
}
publicstatic voidinsertOrderItem(String replace,int i, double sum,Integer proId,Connection con,Statement stat,String integer) throws SQLException {
//5.执行sql语句，并且接收结果
String sql="INSERT INTO t_orderitem(o_itemid,o_count,o_subtotal,pro_id,o_id) VALUES ('"+replace+"','"+i+"','"+sum+"','"+proId+"','"+integer+"')";
System.out.println(sql);
stat.execute(sql);
}
//查询产品信息
public static t_product queryProduct(String next,Connection con,Statement stat) throws SQLException {
t_product t_product = new t_product();
String sql="SELECT * FROM t_product WHERE pro_name='"+next+"'";
System.out.println(sql);
ResultSet rs = stat.executeQuery(sql);
while (rs.next()){
t_product.setcId(rs.getInt("c_id"));
t_product.setProId( rs.getInt("pro_id"));
t_product.setProName(rs.getString("pro_name"));
t_product.setProPrice(rs.getDouble("pro_price"));
t_product.setProMarketPrice(rs.getDouble("pro_market_price"));
t_product.setProDesc(rs.getString("pro_desc"));
t_product.setProCreate(rs.getDate("pro_create"));
t_product.setProState(rs.getByte("pro_state"));
t_product.setProImage(rs.getString("pro_image"));
t_product.setProIsHot(rs.getInt("pro_is_hot"));
return t_product;
}
return null;
}
//添加用户
public static void addUser(String username, String password) throws SQLException {
//4.获取执行者对象
Connection con = jdbcUtil.getCon();
con.setTransactionIsolation(2);
Statement stat = con.createStatement();
//5.执行sql语句，并且接收结果
String sql="insert into t_user(u_name,u_password) values ('"+username+"',+'"+password+"')";
stat.execute(sql);
jdbcUtil.close(con,stat);
}
//添加商品
public static void addGoods(String name, Double price, Integer status) throws SQLException {
//4.获取执行者对象
IdWorker idWorker = new IdWorker();
Long substring = idWorker.nextId();
String id = substring.toString().substring(1, 6);
Connection con = jdbcUtil.getCon();
con.setTransactionIsolation(2);
Statement stat = con.createStatement();
// INSERT INTO t_category (c_id,c_name) VALUES ('华为')
stat.execute("INSERT INTO t_category (c_id,c_name)values ('"+id+"','"+name+"')");
// INSERT INTO t_product(pro_name,pro_price,pro_state,pro_create) VALUES()
stat.execute("INSERT INTO t_product(c_id,pro_name,pro_price,pro_state,pro_create) VALUES('"+id+"','"+name+"',+'"+price+"',+'"+status+"',+'"+new SimpleDateFormat("yyyy-MM-dd hh:mm:ss").format(new Date())+"')");
jdbcUtil.close(con,stat);
}
//查询用户的订单信息
public static List<t_orderitem> findUserOrderItems(t_user user ) throws SQLException {
List<t_orderitem>t_orderitems = new ArrayList<>();
Connection con = jdbcUtil.getCon();
con.setTransactionIsolation(2);
Statement stat = con.createStatement();
//5.执行sql语句，并且接收结果
String sql = "SELECT * FROM t_orderitem WHERE o_id in(select o_id from t_orders where u_id=(select u_id from t_user where u_name='"+user.getuName()+"' and u_password ='"+user.getuPassword()+"'))";
System.out.println(sql);
ResultSet rs = stat.executeQuery(sql);
while (rs.next()){
t_orderitem t_orderitem = new t_orderitem();
t_orderitem.setoItemid(( rs.getString("o_itemid")));
t_orderitem.setoCount(rs.getInt("o_count"));
t_orderitem.setoSubtotal( rs.getDouble("o_subtotal"));
t_orderitem.setProId( rs.getInt("pro_id"));
t_orderitem.setoId( rs.getString("o_id"));
t_orderitems.add(t_orderitem);
}
jdbcUtil.close(con,stat,rs);
return t_orderitems;
}
public static ArrayList<t_orders> findUserOrders(com.manageSystem.pojo.t_user user) throws SQLException {
ArrayList<t_orders> t_orders1 = new ArrayList<>();
// SELECT o_total,o_total,o_name FROM t_orders WHERE u_id=(SELECT u_id from t_user WHERE u_name='root' and u_password='root')
Connection con = jdbcUtil.getCon();
con.setTransactionIsolation(2);
Statement stat = con.createStatement();
//5.执行sql语句，并且接收结果
String sql = "SELECT o_total,o_name FROM t_orders WHERE u_id=(SELECT u_id from t_user WHERE u_name='"+user.getuName()+"' and u_password='"+user.getuPassword()+"')";
System.out.println(sql);
ResultSet rs = stat.executeQuery(sql);
while (rs.next()){
t_orders t_orders = new t_orders();
t_orderitem t_orderitem = new t_orderitem();
t_orders.setoTotal(rs.getDouble("o_total"));
t_orders.setoName(rs.getString("o_name"));
t_orders1.add(t_orders);
}
jdbcUtil.close(con,stat,rs);
return t_orders1;
}
}
main层调用service层
package main.java.com.manageSystem.service;
import com.manageSystem.pojo.t_user;
import main.java.com.manageSystem.dao.manageSystemDao;
import main.java.com.manageSystem.pojo.t_orderitem;
import main.java.com.manageSystem.pojo.t_orders;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
public class Service {
public static void addGoodsOrder(String next, int i, t_user user) throws SQLException {
manageSystemDao.addGoodsOrder(next,i,user);
}
public static void addGoods(String name, Double price, Integer status) throws SQLException {
manageSystemDao.addGoods(name,price,status);
}
public static List<t_orderitem> findUserOrderItems(t_user user) throws SQLException {
return manageSystemDao.findUserOrderItems(user);
}
public static ArrayList<t_orders> findUserOrders(com.manageSystem.pojo.t_user user) throws SQLException {
return manageSystemDao.findUserOrders(user);
}
public com.manageSystem.pojo.t_user findUser(String username, String password) throws Exception {
com.manageSystem.pojo.t_user user1= manageSystemDao.findUser(username,password);
return user1;
}
public void addUser(String username, String password) throws SQLException {
manageSystemDao.addUser(username,password);
}
}
pojo
package main.java.com.manageSystem.pojo;
import java.util.Date;
public class t_admin {
private Integer uId;
private String uName;
private String uPassword;
private Date uAddtime;
private Byte uStatus;
private String uEmail;
private String uTelephone;
public Integer getuId() {
return uId;
}
public void setuId(Integer uId) {
this.uId = uId;
}
public String getuName() {
return uName;
}
public void setuName(String uName) {
this.uName = uName == null ? null : uName.trim();
}
public String getuPassword() {
return uPassword;
}
public void setuPassword(String uPassword) {
this.uPassword = uPassword == null ? null : uPassword.trim();
}
public Date getuAddtime() {
return uAddtime;
}
public void setuAddtime(Date uAddtime) {
this.uAddtime = uAddtime;
}
public Byte getuStatus() {
return uStatus;
}
public void setuStatus(Byte uStatus) {
this.uStatus = uStatus;
}
public String getuEmail() {
return uEmail;
}
public void setuEmail(String uEmail) {
this.uEmail = uEmail == null ? null : uEmail.trim();
}
public String getuTelephone() {
return uTelephone;
}
public void setuTelephone(String uTelephone) {
this.uTelephone = uTelephone == null ? null : uTelephone.trim();
}
}
package main.java.com.manageSystem.pojo;
public class t_category {
private Integer cId;
private String cName;
public Integer getcId() {
return cId;
}
public void setcId(Integer cId) {
this.cId = cId;
}
public String getcName() {
return cName;
}
public void setcName(String cName) {
this.cName = cName == null ? null : cName.trim();
}
}
package main.java.com.manageSystem.pojo;
public class t_orderitem {
private String oItemid;
private Integer oCount;
private Double oSubtotal;
private Integer proId;
private String oId;
public String getoItemid() {
return oItemid;
}
public void setoItemid(String oItemid) {
this.oItemid = oItemid == null ? null : oItemid.trim();
}
public Integer getoCount() {
return oCount;
}
public void setoCount(Integer oCount) {
this.oCount = oCount;
}
public Double getoSubtotal() {
return oSubtotal;
}
public void setoSubtotal(Double oSubtotal) {
this.oSubtotal = oSubtotal;
}
public Integer getProId() {
return proId;
}
public void setProId(Integer proId) {
this.proId = proId;
}
public String getoId() {
return oId;
}
public void setoId(String oId) {
this.oId = oId == null ? null : oId.trim();
}
}
package main.java.com.manageSystem.pojo;
import java.util.Date;
public class t_orders {
private String oId;
private Date oOrdertime;
private Double oTotal;
private Integer oState;
private String oAddress;
private String oName;
private String oTelephone;
private Integer uId;
public String getoId() {
return oId;
}
public void setoId(String oId) {
this.oId = oId == null ? null : oId.trim();
}
public Date getoOrdertime() {
return oOrdertime;
}
public void setoOrdertime(Date oOrdertime) {
this.oOrdertime = oOrdertime;
}
public Double getoTotal() {
return oTotal;
}
public void setoTotal(Double oTotal) {
this.oTotal = oTotal;
}
public Integer getoState() {
return oState;
}
public void setoState(Integer oState) {
this.oState = oState;
}
public String getoAddress() {
return oAddress;
}
public void setoAddress(String oAddress) {
this.oAddress = oAddress == null ? null : oAddress.trim();
}
public String getoName() {
return oName;
}
public void setoName(String oName) {
this.oName = oName == null ? null : oName.trim();
}
public String getoTelephone() {
return oTelephone;
}
public void setoTelephone(String oTelephone) {
this.oTelephone = oTelephone == null ? null : oTelephone.trim();
}
public Integer getuId() {
return uId;
}
public void setuId(Integer uId) {
this.uId = uId;
}
}
package main.java.com.manageSystem.pojo;
import java.util.Date;
public class t_product {
private Integer proId;
private String proName;
private Double proPrice;
private Double proMarketPrice;
private Byte proState;
private Date proCreate;
private Integer cId;
private String proImage;
private Integer proIsHot;
private String proDesc;
public Integer getProId() {
return proId;
}
public void setProId(Integer proId) {
this.proId = proId;
}
public String getProName() {
return proName;
}
public void setProName(String proName) {
this.proName = proName == null ? null : proName.trim();
}
public Double getProPrice() {
return proPrice;
}
public void setProPrice(Double proPrice) {
this.proPrice = proPrice;
}
public Double getProMarketPrice() {
return proMarketPrice;
}
public void setProMarketPrice(Double proMarketPrice) {
this.proMarketPrice = proMarketPrice;
}
public Byte getProState() {
return proState;
}
public void setProState(Byte proState) {
this.proState = proState;
}
public Date getProCreate() {
return proCreate;
}
public void setProCreate(Date proCreate) {
this.proCreate = proCreate;
}
public Integer getcId() {
return cId;
}
public void setcId(Integer cId) {
this.cId = cId;
}
public String getProImage() {
return proImage;
}
public void setProImage(String proImage) {
this.proImage = proImage == null ? null : proImage.trim();
}
public Integer getProIsHot() {
return proIsHot;
}
public void setProIsHot(Integer proIsHot) {
this.proIsHot = proIsHot;
}
public String getProDesc() {
return proDesc;
}
public void setProDesc(String proDesc) {
this.proDesc = proDesc == null ? null : proDesc.trim();
}
}
package com.manageSystem.pojo;
import java.util.Date;
public class t_user {
private Integer uId;
private String uName;
private String uPassword;
private Date uAddtime;
private Byte uStatus;
private String uEmail;
private String uTelephone;
private String uTruename;
private String uSex;
private Date uBirthday;
private String uActivecode=1;
public Integer getuId() {
return uId;
}
public void setuId(Integer uId) {
this.uId = uId;
}
public String getuName() {
return uName;
}
public void setuName(String uName) {
this.uName = uName == null ? null : uName.trim();
}
public String getuPassword() {
return uPassword;
}
public void setuPassword(String uPassword) {
this.uPassword = uPassword == null ? null : uPassword.trim();
}
public Date getuAddtime() {
return uAddtime;
}
public void setuAddtime(Date uAddtime) {
this.uAddtime = uAddtime;
}
public Byte getuStatus() {
return uStatus;
}
public void setuStatus(Byte uStatus) {
this.uStatus = uStatus;
}
public String getuEmail() {
return uEmail;
}
public void setuEmail(String uEmail) {
this.uEmail = uEmail == null ? null : uEmail.trim();
}
public String getuTelephone() {
return uTelephone;
}
public void setuTelephone(String uTelephone) {
this.uTelephone = uTelephone == null ? null : uTelephone.trim();
}
public String getuTruename() {
return uTruename;
}
public void setuTruename(String uTruename) {
this.uTruename = uTruename == null ? null : uTruename.trim();
}
public String getuSex() {
return uSex;
}
public void setuSex(String uSex) {
this.uSex = uSex == null ? null : uSex.trim();
}
public Date getuBirthday() {
return uBirthday;
}
public void setuBirthday(Date uBirthday) {
this.uBirthday = uBirthday;
}
public String getuActivecode=1() {
return uActivecode=1;
}
public void setuActivecode=1(String uActivecode=1) {
this.uActivecode=1 = uActivecode=1 == null ? null : uActivecode=1.trim();
}
@Override
public String toString() {
return "t_user{" +
"uId=" + uId +
", uName='" + uName + '\'' +
", uPassword='" + uPassword + '\'' +
", uAddtime=" + uAddtime +
", uStatus=" + uStatus +
", uEmail='" + uEmail + '\'' +
", uTelephone='" + uTelephone + '\'' +
", uTruename='" + uTruename + '\'' +
", uSex='" + uSex + '\'' +
", uBirthday=" + uBirthday +
", uActivecode=1='" + uActivecode=1 + '\'' +
'}';
}
}
相关util
package main.java.com.manageSystem.util;
import java.lang.management.ManagementFactory;
import java.net.InetAddress;
import java.net.NetworkInterface;
/**
* <p>名称：IdWorker.java</p>
* <p>描述：分布式自增长ID</p>
* <pre>
* Twitter的 Snowflake JAVA实现方案
* </pre>
* 核心代码为其IdWorker这个类实现，其原理结构如下，我分别用一个0表示一位，用—分割开部分的作用：
* 1||0---0000000000 0000000000 0000000000 0000000000 0 --- 00000 ---00000 ---000000000000
* 在上面的字符串中，第一位为未使用（实际上也可作为long的符号位），接下来的41位为毫秒级时间，
* 然后5位datacenter标识位，5位机器ID（并不算标识符，实际是为线程标识），
* 然后12位该毫秒内的当前毫秒内的计数，加起来刚好64位，为一个Long型。
* 这样的好处是，整体上按照时间自增排序，并且整个分布式系统内不会产生ID碰撞（由datacenter和机器ID作区分），
* 并且效率较高，经测试，snowflake每秒能够产生26万ID左右，完全满足需要。
* <p>
* 64位ID (42(毫秒)+5(机器ID)+5(业务编码)+12(重复累加))
*
* @author Polim
*/
public class IdWorker {
// 时间起始标记点，作为基准，一般取系统的最近时间（一旦确定不能变动）
private final static long twepoch = 1288834974657L;
// 机器标识位数
private final static long workerIdBits = 5L;
// 数据中心标识位数
private final static long datacenterIdBits = 5L;
// 机器ID最大值
private final static long maxWorkerId = -1L ^ (-1L << workerIdBits);
// 数据中心ID最大值
private final static long maxDatacenterId = -1L ^ (-1L << datacenterIdBits);
// 毫秒内自增位
private final static long sequenceBits = 12L;
// 机器ID偏左移12位
private final static long workerIdShift = sequenceBits;
// 数据中心ID左移17位
private final static long datacenterIdShift = sequenceBits + workerIdBits;
// 时间毫秒左移22位
private final static long timestampLeftShift = sequenceBits + workerIdBits + datacenterIdBits;
private final static long sequenceMask = -1L ^ (-1L << sequenceBits);
/* 上次生产id时间戳 */
private static long lastTimestamp = -1L;
// 0，并发控制
private long sequence = 0L;
private final long workerId;
// 数据标识id部分
private final long datacenterId;
public IdWorker(){
this.datacenterId = getDatacenterId(maxDatacenterId);
this.workerId = getMaxWorkerId(datacenterId, maxWorkerId);
}
/**
* @param workerId
* 工作机器ID
* @param datacenterId
* 序列号
*/
public IdWorker(long workerId, long datacenterId) {
if (workerId > maxWorkerId || workerId < 0) {
throw new IllegalArgumentException(String.format("worker Id can't be greater than %d or less than 0", maxWorkerId));
}
if (datacenterId > maxDatacenterId || datacenterId < 0) {
throw new IllegalArgumentException(String.format("datacenter Id can't be greater than %d or less than 0", maxDatacenterId));
}
this.workerId = workerId;
this.datacenterId = datacenterId;
}
/**
* 获取下一个ID
*
* @return
*/
public synchronized long nextId() {
long timestamp = timeGen();
if (timestamp < lastTimestamp) {
throw new RuntimeException(String.format("Clock moved backwards.Refusing to generate id for %d milliseconds", lastTimestamp - timestamp));
}
if (lastTimestamp == timestamp) {
// 当前毫秒内，则+1
sequence = (sequence + 1) & sequenceMask;
if (sequence == 0) {
// 当前毫秒内计数满了，则等待下一秒
timestamp = tilNextMillis(lastTimestamp);
}
} else {
sequence = 0L;
}
lastTimestamp = timestamp;
// ID偏移组合生成最终的ID，并返回ID
long nextId = ((timestamp - twepoch) << timestampLeftShift)
| (datacenterId << datacenterIdShift)
| (workerId << workerIdShift) | sequence;
return nextId;
}
private long tilNextMillis(final long lastTimestamp) {
long timestamp = this.timeGen();
while (timestamp <= lastTimestamp) {
timestamp = this.timeGen();
}
return timestamp;
}
private long timeGen() {
return System.currentTimeMillis();
}
/**
* <p>
* 获取 maxWorkerId
* </p>
*/
protected static long getMaxWorkerId(long datacenterId, long maxWorkerId) {
StringBuffer mpid = new StringBuffer();
mpid.append(datacenterId);
String name = ManagementFactory.getRuntimeMXBean().getName();
if (!name.isEmpty()) {
/*
* GET jvmPid
*/
mpid.append(name.split("@"));
}
/*
* MAC + PID 的 hashcode 获取16个低位
*/
return (mpid.toString().hashCode() & 0xffff) % (maxWorkerId + 1);
}
/**
* <p>
* 数据标识id部分
* </p>
*/
protected static long getDatacenterId(long maxDatacenterId) {
long id = 0L;
try {
InetAddress ip = InetAddress.getLocalHost();
NetworkInterface network = NetworkInterface.getByInetAddress(ip);
if (network == null) {
id = 1L;
} else {
byte[] mac = network.getHardwareAddress();
id = ((0x000000FF & (long) mac)
| (0x0000FF00 & (((long) mac) << 8))) >> 6;
id = id % (maxDatacenterId + 1);
}
} catch (Exception e) {
System.out.println(" getDatacenterId: " + e.getMessage());
}
return id;
}
}
package main.java.com.manageSystem.util;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
public class jdbcUtil{
//1.导入jar包
//2.注册驱动
static {
try {
Class.forName("com.mysql.jdbc.Driver");
}
catch (Exception e) {
e.printStackTrace();
}
}
//3.获取连接
public static Connection getCon(){
Connection con=null;
try {
con = DriverManager.getConnection("jdbc:mysql://localhost:3306/yingkongshopdb?characterEncoding=UTF-8&serverTimezone=UTC","root","root");
}
catch (Exception e) {
e.printStackTrace();
}
returncon;
}
//7.释放资源
public static voidclose(Connection Con,Statement stat,ResultSet rs) {
try {
if(Con!=null){
Con.close();
}
if(stat!=null){
stat.close();
}
if(rs!=null){
rs.close();
}
}
catch (Exception e){
e.printStackTrace();
}
}
public static voidclose(Connection Con,Statement stat) {
try {
if(Con!=null){
Con.close();
}
if(stat!=null){
stat.close();
}
}
catch (Exception e){
e.printStackTrace();
}
}
//
// //6.处理结果
// while(rs.next()) {
// System.out.println(rs.getInt("id") + "\t" + rs.getString("name"));
// }
//
// //7.释放资源
// con.close();
// stat.close();
// con.close();
//}
}
由于我电脑重装了,所以数据库也没了,大家自己参照pojo建一个就行,mysql连接信息也改一下.
下载地址:
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