2019独角兽企业重金招聘Python工程师标准>>> 
首先，数据库新建两张表：loginlog 字段：id ，userID，logintime，success
第二张：t_table_id 字段table_name,value ；默认写入数据loginlog；0
1、Loginlog.java
package com.marcellotest.basedata.domain;
/**
* 用户登录日志
* @author Administrator
*
*/
public class Loginlog {
public String getUserId() {
return userId;
}
public void setUserId(String userId) {
this.userId = userId;
}
public String getLogintime() {
return logintime;
}
public void setLogintime(String logintime) {
this.logintime = logintime;
}
public int getSuccess() {
return success;
}
public void setSuccess(int success) {
this.success = success;
}
public void setLoginLogID(String loginLogID) {
LoginLogID = loginLogID;
}
public String getLoginLogID() {
return LoginLogID;
}
//主键
private String LoginLogID;
private String userId;
private String logintime;
private int success;
}2、LoginlogManager.java
package com.marcellotest.basedata.manager;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import com.marcellotest.basedata.domain.Loginlog;
import com.marcellotest.util.DBUtil;
import com.marcellotest.util.generator.IDGenerator;
public class LoginlogManager {
private static LoginlogManager instance = null;
private LoginlogManager() {}
public static synchronized LoginlogManager getInstance() {
if (instance == null) {
instance = new LoginlogManager();
}
return instance;
}
/**
* 根据userid查询登录日志
* @param userid
* @return 如果存在返回返回最后三次登录失败信息，否则返回null
*/
public List findUserLOGById(String userID) {
StringBuffer sbSql = new StringBuffer();
sbSql.append("select * from loginlog " )
.append("where userId =?" )
.append("and success = 0 " )
.append("and loginTime like ? ")
.append("order by logintime DESC ")
.append("limit 3 ");
Connection conn = null;
PreparedStatement pstmt = null;
ResultSet rs = null;
Date now = new Date();
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
String today = dateFormat.format(now);
List list = new ArrayList();
try {
conn = DBUtil.getConnection();
pstmt = conn.prepareStatement(sbSql.toString());
pstmt.setString(1, userID);
pstmt.setString(2,"%"+today+"%");
rs = pstmt.executeQuery();
while(rs.next()){
list.add(rs.getString("LoginLogID"));
list.add(rs.getString("userid"));
list.add(rs.getString("logintime"));
list.add(rs.getString("success"));
}
}catch(SQLException e) {
e.printStackTrace();
}finally {
DBUtil.close(rs);
DBUtil.close(pstmt);
DBUtil.close(conn);
}
//System.out.println(list);
return list;
}
/**
* 添加log记录到数据库
* @param client
*/
public void addUserLOG(Loginlog Loginlog) {
StringBuffer sbsql = new StringBuffer();
sbsql.append("insert into loginlog ( ")
.append("LoginLogID, userID, loginTime, ")
.append("success) ")
.append("values (? ,? ,?, ?) ");
Connection conn = null;
PreparedStatement pstmt = null;
Date now = new Date();
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String createDate = dateFormat.format(now);
try {
conn = DBUtil.getConnection();
//开启事务
DBUtil.setAutoCommit(conn, false);
pstmt = conn.prepareStatement(sbsql.toString());
pstmt.setInt(1, (int)IDGenerator.getInstance().newID("loginlog"));
pstmt.setString(2, Loginlog.getUserId());
pstmt.setString(3, createDate);
pstmt.setInt(4, Loginlog.getSuccess());
pstmt.executeUpdate();
//提交事务
DBUtil.commit(conn);
}catch(Exception e) {
e.printStackTrace();
//回滚事务
DBUtil.rollback(conn);
}finally {
DBUtil.close(pstmt);
DBUtil.close(conn);
}
}
}
3、LoginlogUtil.java
package com.marcellotest.util;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import com.marcellotest.basedata.domain.Loginlog;
import com.marcellotest.basedata.manager.LoginlogManager;
public class LoginlogUtil {
private static LoginlogUtil instance = null;
private LoginlogUtil() {}
public static synchronized LoginlogUtil getInstance() {
if (instance == null) {
instance = new LoginlogUtil();
}
return instance;
}
static Loginlog Loginlog = new Loginlog();
/**
* 添加日志信息
* @param userid
* @return
*/
public void ADDloginlogItem(Loginlog loginlog)
{
Loginlog.setUserId(loginlog.getUserId());
Loginlog.setSuccess(loginlog.getSuccess());
LoginlogManager.getInstance().addUserLOG(Loginlog);
}
/**
* 判断该用户名是否符合登录要求
* 5分钟内输错三次锁住该用户
*/
public boolean SelectloginlogItem(Loginlog loginlog){
//把查询出来的数据放入list中
List list = new ArrayList();
list= LoginlogManager.getInstance().findUserLOGById(loginlog.getUserId());
boolean flag = false;
System.out.println("个数"+list.size());
//循环
//for(String str : list){
// System.out.println(str);
// }
//判断是否含有3行数据，如果没有直接返回true
if(list.size()<12){
flag = true;
}
else{
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
try {
//现状的时间
Date now = new Date();
//最后一次输错时间
Date ErrorOne= df.parse(list.get(2));
//前三次输错时间
Date ErrorTree = df.parse(list.get(10));
//最后一次输错时间和目前尝试登陆时间
long spaceTIME = now.getTime()-ErrorOne.getTime();
long spaceTIMEmin = spaceTIME/1000;
//最后三次间隔时间
long DifferTime=ErrorOne.getTime()-ErrorTree.getTime();
//long day=l/(24*60*60*1000);
//long hour=(l/(60*60*1000)-day*24);
//long min=((l/(60*1000))-day*24*60-hour*60);
// long s=(l/1000-day*24*60*60-hour*60*60-min*60);
//转换成秒进行比较
long s1=DifferTime/1000;
//System.out.println(""+day+"天"+hour+"小时"+min+"分"+s+"秒");
System.out.println(s1);
//判断时间是否间隔一个小时
if(spaceTIMEmin>=3600)
{
flag=true;
}
else{
//判断是否5分钟内输入三次错误；
if(s1<=300){
flag = true;
}
else{
flag = false;
}
}
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
//String a = list.get(2);
//System.out.println(a);
//String b = list.get(10);
//System.out.println(b);
}
return flag;
}
public static void main(String[] args) {
}
} 生成唯一ID：IDGenerator.java
package com.marcellotest.util.generator;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import com.marcellotest.util.DBUtil;
/**
* id生成器,采用单例模式
* @author Administrator
*
*/
public class IDGenerator {
private static IDGenerator instance = new IDGenerator();
private IDGenerator() {}
public static IDGenerator getInstance() {
return instance;
}
/**
* 生成新id
* @param tableName
* @return
*/
//public synchronized long newID(String tableName) {
//synchronized(this) {
public long newID(String tableName) {
String sql = "select value from t_table_id where table_name=? for update";
Connection conn = null;
PreparedStatement pstmt = null;
ResultSet rs = null;
long value = 0L;
try {
conn = DBUtil.getConnection();
////开启事务
DBUtil.setAutoCommit(conn, false);
pstmt = conn.prepareStatement(sql);
pstmt.setString(1, tableName);
rs = pstmt.executeQuery();
if (rs.next()) {
value = rs.getLong("value");
}else {
throw new RuntimeException("生成Id出错！");
}
value = value + 1;
//更新value
modifyValueField(conn, tableName, value);
//提交事务
DBUtil.commit(conn);
}catch(Exception e) {
e.printStackTrace();
//回滚事务
DBUtil.rollback(conn);
throw new RuntimeException("生成Id出错！");
}finally {
DBUtil.close(rs);
DBUtil.close(pstmt);
DBUtil.close(conn);
}
return value;
}
/**
* 更新value
* @param conn
* @param tableName
* @param value
* @throws SQLException
*/
private void modifyValueField(Connection conn, String tableName, long value)
throws SQLException {
String sql = "update t_table_id set value=? where table_name=?";
PreparedStatement pstmt = null;
try {
pstmt = conn.prepareStatement(sql);
pstmt.setLong(1, value);
pstmt.setString(2, tableName);
pstmt.executeUpdate();
}finally {
DBUtil.close(pstmt);
}
}
public static void main(String[] args) {
long newId = IDGenerator.getInstance().newID("t_client");
System.out.println(newId);
}
}登陆时调用
/**
* * 登录(采用非受控异常)
* @param userId
* @param password
*/
public User login(String userId, String password) {
CipherUtil cipher = new CipherUtil();
Loginlog loginlog = new Loginlog();
loginlog.setUserId(userId);
//throws UserNotFoundException, PasswordNotCorrectException{ //必须抛出
User user = findUserById(userId);
if (user == null) {
System.out.println(user);
throw new UserNotFoundException("用户代码不能找到，代码=【" + userId +"】");
}
//采用加密方式
if (!user.getPassword().equals(cipher.generatePassword(password))) {
//调用记录日志函数
loginlog.setSuccess(0);
LoginlogManager.getInstance().addUserLOG(loginlog);
throw new PasswordNotCorrectException("密码不正确");
}
if(!LoginlogUtil.getInstance().SelectloginlogItem(loginlog)){
throw new PasswordNotCorrectException("一小时后再试试");
}
System.out.println("user");
//调用记录日志函数
loginlog.setSuccess(1);
LoginlogManager.getInstance().addUserLOG(loginlog);
return user;
}有些人会说写入日志时在调用时：
loginlog.setUserId(userId);
loginlog.setSuccess(1);
业务逻辑层又一次，为什么不直接登陆时候直接调用；这边是为了把这些都分开，如果大公司，业务层，逻辑层都是分开的，就是说你登陆只能调用逻辑层；
最后调用时候的抛出异常类我没有继续写了，如果有需要根据实际情况写抛出；