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原创 log4j-1.x 日志脱敏 扩展PatternLayout类+修改log4j.properties
log4j-1.2.16 日志手机号码脱敏背景项目做完，公司安全测试，说系统有安全漏洞，日志中未对用户信息进行脱敏处理，需要我对手机号进行脱敏处理，至少隐藏四位。锅从天上来，一期的项目的安全漏洞，之前没有安全测试，二期项目结束，测出来了，一脸懵的我~好学和负责任的我（没办法，后来就算不算是二期项目的锅，我是系统Owner，最后还是算是系统问题），开始找资料怎么修复，网上一堆资料，怕个啥。过...
2019-03-21 19:48:49
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原创 1、CSDN markdown 字体、字号、颜色设置（自己用的）
居中的代码是<div align=center> CSDN markdown 字体、字号、颜色设置
2017-02-23 16:56:50
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原创 Spring 验证（Validation）、数据绑定（Data Binding）和类型转换（Type Conversion）
在Web层，应用程序还可以根据DataBinder为每个控制器注册控制器本地的Spring Validator实例，如在配置DataBinder中所述，这对于插入自定义验证逻辑非常有用。Spring的类型转换机制可以帮助开发者处理请求参数的解析和转换，以适应目标方法或模型对象的需求。通过在模型对象的属性上添加合适的验证注解（如@NotNull、@Size等），可以在处理请求参数或表单数据时进行验证。考虑到这些问题，Spring提供了一个验证器接口（Validator），基本且易于在应用程序的每个层中使用。
2023-07-10 12:37:53
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原创 mysql锁的问题
而如果使用的是 InnoDB 存储引擎，插入操作会锁定新插入的行，这属于行级锁。当插入一行数据时，会对此行加锁，直到插入完成后才释放锁，这可以避免多个用户同时插入同一行数据的问题。如果使用的是 MyISAM 存储引擎，插入操作会锁定整个表，这是表级锁。总之，在插入操作时，应该选择正确的存储引擎，并考虑事务的隔离级别，以避免潜在的性能问题和数据一致性问题。在 MySQL 中，插入操作会涉及到行级锁和表级锁，具体涉及到哪种锁取决于存储引擎和事务的隔离级别。
2023-06-02 09:47:41
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原创 jstat和jmap查看JVM堆内存使用情况
查看java进程$jps -l结果69492 sun.tools.jps.Jps69268 66776 69469 org.jetbrains.jps.cmdline.Launcher57501 /Users/ma-l00000701/Downloads/apache-jmeter-5.2.1/bin/ApacheJMeter.jar69470 org.apache.catalina.startup.Bootstrap查看org.apache.catalina.startup.Boot
2020-06-27 23:35:19
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原创 MAC端口号被占用问题
idea 异常退出，再次启动本地项目时，1099端口被占用1、使用 lsof -i:1099 命令查看所占用的进程号 PID=692002、使用 kill -9 69200 命令杀掉占用1099端口号的进程TN-MA-L00000701deMacBook-Pro:~ tn-ma-l00000701$ lsof -i:1099COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAMEjava 69
2020-06-27 22:30:55
279
原创 对Runnable 和 Thread的思考
见到一个问题：java中下面哪个能创建并启动线程（）public class MyRunnable implements Runnable{ public void run(){ //some code here } }A、new Runnable(MyRunnable).start()B、new Thread(MyRunnable).ru...
2020-04-29 09:13:58
180
原创 SQLException: Value '0000-00-00 00:00:00' can not be represented as java.sql.Timestamp
Error querying database. Cause: java.sql.SQLException: Value ‘0000-00-00 00:00:00’ can not be represented as java.sql.Timestamp解决方案 <property name="url"> <value>jdbc:...
2020-04-02 16:59:07
169
原创 SpringMVC中List长度超过256抛出IndexOutOfBoundsException异常
org.springframework.beans.InvalidPropertyException : Invalid property 'visaRes[256]' of bean class [com.xxx.xxx.GenerateResVo]: Index of out of bounds in property path 'visaRes[256]'; nested exception...
2019-12-19 22:36:32
449
原创 java多线程共享成员变量的安全问题
1、问题描述批量变更产品专员时，为产品专员开通对应产品权限时，是用多线程任务去执行的，出现的问题时，批量开通100个产品权限时，可能只真正开通几个产品的权限，其他产品的权限并未开通。通过分析日志，发现调用开通权限的接口，入参是最后一个产品ID的记录有61个，剩余39个请求，也有重复的产品ID，怀疑多线程并发问题导致2、问题分析创建线程的类实现Runnable 类接口，重写run方法，通过构造...
2019-12-14 13:02:20
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原创 不可见字符和字符串前后空格处理
背景场景一：有技术支持过来，说用户登录不上，报错原因是不存在该用户，但是明明已经注册过了。过程：登陆的请求参数确实有收到，用户名是手机号。用户id也是存在的，根据用户id查出来的手机号，确实和登陆名是一样的，但是为啥会报用户不存在的错误呀？开始根本没有想过用手机号进行查询，后来实在是没有排查到别的原因，突然想到之前遇到的手机号前后有空格的问题。length了一下，果然，长度为17。告知业务...
2019-10-18 13:41:12
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原创 日志打印mybatis中SQL
log4j.rootLogger = DEBUG,stdout,Dlog4j.appender.stdout=org.apache.log4j.ConsoleAppenderlog4j.appender.stdout.Threshold = DEBUGlog4j.appender.stdout.layout=com.tuniu.gt.common.ExPatternLayoutlog4j...
2019-04-02 16:35:57
233
原创 记一次应用接口日志访问量和访问时长统计
2019-03-141、下载运维每天归档的日志2、找运维要到 tomcat acess log 配置格式为 pattern="%{X-Forwarded-For}i %l %u %t “%r” %m %s %b %D"3、日志数据量不是很大，一共两个文件，每个文件60W数据量。先导入到excel中，预处理了一下，几个不需要的字段删除掉，本来想在excel中统计，速度太慢，统计了两个接口就受...
2019-03-14 11:25:09
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原创 cvc-complex-type.2.4.c错误解决
报错信息： cvc-complex-type.2.4.c:The matching wildcard is strict,but no declaration can be found for element’tx:advice’ 解决办法: 在 xsi:schemaLocation 加上： http://www.springframework.org/schema/tx http://w...
2018-08-05 21:43:38
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原创 MySQL+Maven+Spring+Mybatis
一. 数据库准备MySQL安装包是 mysql-5.5.19-win32.msi，图形化管理MySQL界面 sqlyog_mysql.zip 查看数据库show databases;建表语句use test;DROP TABLE IF EXISTS `t_user`; CREATE TABLE `t_user` ( `user_id` int(11) NOT NU...
2018-05-24 14:41:30
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原创 Linux当月第一天日期，某日期前一天日期，某日期前一年日期
#当月的第一天日期dt_date=`date +%Y%m01`# dt_date日期往前推1年R1_date_start=`date --date="${dt_date}-1 year" +%Y-%m-%d`# R1_date_start日期往前推1年R2_date_start=`date --date="${R1_date_start}-1 year" +%Y-%m-%d`#...
2018-04-11 15:13:18
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原创 Linux 下用 crontab配置定时任务
1、crontab - l //查看定时任务列表 2、crontab -e //编辑定时任务 3、crontab 配置定时任务格式 : Minute Hour Day Month Dayofweek command举例说明： Minute Hour Day Month Day of week 描述 5 * * * * 每...
2018-04-11 10:43:53
210
原创 LeetCode107. Binary Tree Level Order Traversal II
Given a binary tree, return the bottom-up level order traversal of its nodes’ values. (ie, from left to right, level by level from leaf to root).For example: Given binary tree [3,9,20,null,null,15,7],
2017-05-07 21:33:07
317
原创 LeetCode104. Maximum Depth of Binary Tree
Given a binary tree, find its maximum depth.The maximum depth is the number of nodes along the longest path from the root node down to the farthest leaf node.递归/** * Definition for a binary tree node.
2017-05-07 17:01:45
325
原创 LeetCode101. Symmetric Tree
Given a binary tree, check whether it is a mirror of itself (ie, symmetric around its center).For example, this binary tree [1,2,2,3,4,4,3] is symmetric: 1 / \ 2 2 / \ / \3 4 4 3But the f
2017-05-07 15:58:43
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原创 LeetCode567. Permutation in String
Given two strings s1 and s2, write a function to return true if s2 contains the permutation of s1. In other words, one of the first string’s permutations is the substring of the second string.Example 1
2017-05-07 15:04:59
331
原创 LeetCode575. Distribute Candies
Given an integer array with even length, where different numbers in this array represent different kinds of candies. Each number means one candy of the corresponding kind. You need to distribute these
2017-05-07 15:02:53
375
原创 LeetCode42. Trapping Rain Water
Given n non-negative integers representing an elevation map where the width of each bar is 1, compute how much water it is able to trap after raining.For example, Given [0,1,0,2,1,0,1,3,2,1,2,1], ret
2017-04-22 13:33:58
336
原创 LeetCode34. Search for a Range
Given an array of integers sorted in ascending order, find the starting and ending position of a given target value.Your algorithm’s runtime complexity must be in the order of O(log n).If the target is
2017-04-22 11:18:46
247
原创 LeetCOde33. Search in Rotated Sorted Array
Suppose an array sorted in ascending order is rotated at some pivot unknown to you beforehand.(i.e., 0 1 2 4 5 6 7 might become 4 5 6 7 0 1 2).You are given a target value to search. If found in the ar
2017-04-22 10:43:34
269
原创 LeetCode31. Next Permutation
Implement next permutation, which rearranges numbers into the lexicographically next greater permutation of numbers.If such arrangement is not possible, it must rearrange it as the lowest possible orde
2017-04-21 21:04:01
290
原创 LeetCode25. Reverse Nodes in k-Group
Given a linked list, reverse the nodes of a linked list k at a time and return its modified list.k is a positive integer and is less than or equal to the length of the linked list. If the number of nod
2017-04-21 11:27:36
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原创 LeetCode24. Swap Nodes in Pairs
Given a linked list, swap every two adjacent nodes and return its head.For example, Given 1->2->3->4, you should return the list as 2->1->4->3.Your algorithm should use only constant space. You may no
2017-04-21 09:28:12
327
原创 LeetCOde19. Remove Nth Node From End of List
Given a linked list, remove the nth node from the end of list and return its head.For example,Given linked list: 1->2->3->4->5, and n = 2.After removing the second node from the end, the linked list be
2017-04-20 20:39:33
235
原创 LeetCode18. 4Sum
Given an array S of n integers, are there elements a, b, c, and d in S such that a + b + c + d = target? Find all unique quadruplets in the array which gives the sum of target.Note: The solution set mu
2017-04-20 19:54:14
368
原创 LeetCode17. Letter Combinations of a Phone Number
Given a digit string, return all possible letter combinations that the number could represent.A mapping of digit to letters (just like on the telephone buttons) is given below. Input:Digit string “23”
2017-04-17 20:45:46
399
原创 LeetCode16. 3Sum Closest
Given an array S of n integers, find three integers in S such that the sum is closest to a given number, target. Return the sum of the three integers. You may assume that each input would have exactly
2017-04-17 10:50:56
304
原创 LeetCode15. 3Sum
Given an array S of n integers, are there elements a, b, c in S such that a + b + c = 0? Find all unique triplets in the array which gives the sum of zero.Note: The solution set must not contain duplic
2017-04-17 09:16:17
350
原创 LeetCode88. Merge Sorted Array
Given two sorted integer arrays nums1 and nums2, merge nums2 into nums1 as one sorted array.Note: You may assume that nums1 has enough space (size that is greater or equal to m + n) to hold additional
2017-04-10 14:24:26
230
原创 LeetCode83. Remove Duplicates from Sorted List
Given a sorted linked list, delete all duplicates such that each element appear only once.For example, Given 1->1->2, return 1->2. Given 1->1->2->3->3, return 1->2->3./** * Definition for singly-lin
2017-04-09 10:27:55
210
原创 LeetCode70. Climbing Stairs
You are climbing a stair case. It takes n steps to reach to the top.Each time you can either climb 1 or 2 steps. In how many distinct ways can you climb to the top?Note: Given n will be a positive inte
2017-04-09 09:44:07
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原创 LeetCode67. Add Binary
Given two binary strings, return their sum (also a binary string).For example, a = “11” b = “1” Return “100”.#include<string>#include<cstdlib>#include<iostream>using namespace std;class Solution
2017-04-06 21:19:33
313
原创 LeetCode66. Plus One
Given a non-negative integer represented as a non-empty array of digits, plus one to the integer.You may assume the integer do not contain any leading zero, except the number 0 itself.The digits are st
2017-04-06 21:12:34
269
原创 LeetCode66. Plus One
Given a non-negative integer represented as a non-empty array of digits, plus one to the integer.You may assume the integer do not contain any leading zero, except the number 0 itself.The digits are st
2017-04-06 19:50:45
218
原创 LeetCode58. Length of Last Word
Given a string s consists of upper/lower-case alphabets and empty space characters ’ ‘, return the length of last word in the string.If the last word does not exist, return 0.Note: A word is defined as
2017-04-06 18:49:12
238
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