Language►Java►SpringBoot

aware

Aware

BeanNameAware

beanNameAware可以获得容器中Bean的名称，作用于每一个Bean。当bean被创建的时候设置他的名字，在基本properties填充完成以后，init调用前执行

摘自： spring-beans:5.3.4 org.springframework.beans.factory.BeanNameAware

Set the name of the bean in the bean factory that created this bean.

Invoked after population of normal bean properties but before an init callback such as {@link InitializingBean#afterPropertiesSet()} or a custom init-method.

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package com.example.demo;

import org.springframework.beans.factory.BeanNameAware;
import org.springframework.stereotype.Component;

@Component
public class BeanNameAwareDemo implements BeanNameAware {
    @Override
    public void setBeanName(String name) {
        System.out.println(name);
    }
}

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Language►Java►SpringCloud

feign

Feign

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import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.ObjectMapper;
import feign.Logger;
import feign.codec.Decoder;
import feign.codec.Encoder;
import java.util.Arrays;
import org.springframework.beans.factory.ObjectFactory;
import org.springframework.boot.autoconfigure.http.HttpMessageConverters;
import org.springframework.cloud.openfeign.support.ResponseEntityDecoder;
import org.springframework.cloud.openfeign.support.SpringDecoder;
import org.springframework.cloud.openfeign.support.SpringEncoder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.MediaType;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;

@Configuration
public class FeignConfigure {
    @Bean
    public Decoder feignDecoder() {
        HttpMessageConverter jacksonConverter = new MappingJackson2HttpMessageConverter(customObjectMapper());
        ObjectFactory<HttpMessageConverters> objectFactory = () -> new HttpMessageConverters(jacksonConverter);
        return new ResponseEntityDecoder(new SpringDecoder(objectFactory));
    }
    @Bean
    public Encoder feignEncoder(){
        HttpMessageConverter jacksonConverter = new MappingJackson2HttpMessageConverter(customObjectMapper());
        ObjectFactory<HttpMessageConverters> objectFactory = () -> new HttpMessageConverters(jacksonConverter);
        return new SpringEncoder(objectFactory);
    }

    public ObjectMapper customObjectMapper() {
        ObjectMapper objectMapper = new ObjectMapper();
        //Customize as much as you want
        objectMapper.configure(DeserializationFeature.ACCEPT_EMPTY_STRING_AS_NULL_OBJECT, true);
        return objectMapper;
    }

    @Bean
    public Logger.Level logger() {
        return Logger.Level.FULL;
    }
}
Language►Java►Grava

ratelimiter

Guava

RateLimiter

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RateLimiter rateLimiter = RateLimiter.create(10);
for (int i = 0; i < 20; i++) {
    int finalI = i;
    new Thread(new Runnable() {
        @Override
        public void run() {
            int cnt = 0;
            while (true) {
                if (rateLimiter.tryAcquire()) {
                    cnt++;
                    System.out.println("thread: " + finalI + " cnt: " + cnt);
                }
            }
        }
    }).start();
}
Thread.sleep(1000 * 100 * 1000);

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操作系统►Linux

SSH

SSH Install

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# 必须安装passwd
yum install openssh-server openssh-clients passwd  -y; \
sed -i "s/^UsePAM yes/UsePAM no/g" /etc/ssh/sshd_config; \
echo 123456 | passwd root --stdin; \
ssh-keygen -t rsa -P '' -f ~/.ssh/id_rsa; \
cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys; \
chmod 0600 ~/.ssh/authorized_keys; \
ssh-keygen -q -N "" -t rsa -f /etc/ssh/ssh_host_rsa_key; \
ssh-keygen -q -N "" -t ecdsa -f /etc/ssh/ssh_host_ecdsa_key; \
ssh-keygen -q -N "" -t ed25519 -f /etc/ssh/ssh_host_ed25519_key; \
/usr/sbin/sshd

SSH Install2

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# 必须安装passwd
yum install openssh-server openssh-clients passwd  -y; \
sed -i "s/^UsePAM yes/UsePAM no/g" /etc/ssh/sshd_config; \
echo 123456 | passwd root --stdin; \
ssh-keygen -q -N "" -t rsa -f /etc/ssh/ssh_host_rsa_key; \
ssh-keygen -q -N "" -t ecdsa -f /etc/ssh/ssh_host_ecdsa_key; \
ssh-keygen -q -N "" -t ed25519 -f /etc/ssh/ssh_host_ed25519_key; \
/usr/sbin/sshd

id_rsa

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chmod 0600 id_rsa
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xxxx
~~~~
xxxx

authorized_keys

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ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQCxlCDiJkFEK+cI9i1RltBdzhmkpEOHxGaqJh9CXzkmWRCYE1IaqBQ3ev+kHMShMX48crpdv1mHVrMvt9Kpo7PhkZem+Pd5i+PMVw53MY3Ow0ntoaqK0nBclDieJNmb32BfdI19nm4j6bSyyh8IMmYPsBfTR5wO+5u4cZxXb4I4mocVtvQXa3g7yZHaeEAVL9WfCrWM8/tH/7sAcP3pxdIuoIht/dMBU6wbRt7oPPC7pgw4uDq6y0sHv5SR9zlrmyqusZHDkg+BUaaFnsxnwREuC5Ll1q6ufqNBoUhTETxmZTaqMiwXyKb3gIer8BVctLRoKstNxX08CBiM/1RNzFX3 1144560553@qq.com

id_rsa.pub

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ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQCxlCDiJkFEK+cI9i1RltBdzhmkpEOHxGaqJh9CXzkmWRCYE1IaqBQ3ev+kHMShMX48crpdv1mHVrMvt9Kpo7PhkZem+Pd5i+PMVw53MY3Ow0ntoaqK0nBclDieJNmb32BfdI19nm4j6bSyyh8IMmYPsBfTR5wO+5u4cZxXb4I4mocVtvQXa3g7yZHaeEAVL9WfCrWM8/tH/7sAcP3pxdIuoIht/dMBU6wbRt7oPPC7pgw4uDq6y0sHv5SR9zlrmyqusZHDkg+BUaaFnsxnwREuC5Ll1q6ufqNBoUhTETxmZTaqMiwXyKb3gIer8BVctLRoKstNxX08CBiM/1RNzFX3 1144560553@qq.com

Problem

Docker Install

  • Dockerfile
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FROM centos:centos8
RUN yum install openssh-server openssh-clients passwd  -y; \
sed -i "s/^UsePAM yes/UsePAM no/g" /etc/ssh/sshd_config; \
echo 123456 | passwd root --stdin; \
ssh-keygen -t rsa -P '' -f ~/.ssh/id_rsa; \
cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys; \
chmod 0600 ~/.ssh/authorized_keys; \
ssh-keygen -q -N "" -t rsa -f /etc/ssh/ssh_host_rsa_key; \
ssh-keygen -q -N "" -t ecdsa -f /etc/ssh/ssh_host_ecdsa_key; \
ssh-keygen -q -N "" -t ed25519 -f /etc/ssh/ssh_host_ed25519_key;
EXPOSE 22
CMD ["/usr/sbin/sshd", "-D"]
  • Build
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  • Run
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docker run -itd -p 2222:22 sshd:centos8
  • Connect
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ssh localhost -p 2222

USE

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ssh root@9.135.10.2 -p 36000 -P
xxxx

操作系统

Linux

Linux

换源

https://zhuanlan.zhihu.com/p/61228593

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sudo cp /etc/apt/sources.list /etc/apt/sources.list_backup
sudo vi /etc/apt/sources.list

## 添加在最前面
deb http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse


sudo apt-get update -y
sudo apt-get upgrade -y
sudo apt-get install build-essential -y

安装yum

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sudo apt-get install yum -y

XXD

这是一个16进制查看工具

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# 查看帮助
xxd -h

# 查看文件前100个字节
xxd -l 100 file.bin

OD

同XXD

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od [选项] 文件
od -d 文件  十进制输出
   -o 文件  八进制输出
   -x 文件  十六进制输

磁盘管理

查看磁盘使用情况

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第一列是文件系统， 一般是虚拟磁盘和物理磁盘，我们一般只用关心物理磁盘

查看文件夹使用情况

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vim

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git clone https://github.com/VundleVim/Vundle.vim.git ~/.vim/bundle/Vundle.vim
 
echo >~/.vimrc<<EOF 
" Vundle set nocompatible
filetype off
set rtp+=~/.vim/bundle/Vundle.vim
call vundle#begin()
Plugin 'VundleVim/Vundle.vim'
Plugin 'The-NERD-Tree'
Plugin 'gdbmgr'
Plugin 'mbbill/undotree'
Plugin 'majutsushi/tagbar'
Plugin 'vim-airline/vim-airline' " 状态栏
Plugin 'vim-airline/vim-airline-themes' "状态栏
Plugin 'cohlin/vim-colorschemes' " 主题
Plugin 'tomasr/molokai' " molokai
Plugin 'jiangmiao/auto-pairs' " 括号补全
Plugin 'plasticboy/vim-markdown'
Plugin 'iamcco/mathjax-support-for-mkdp' " 数学公式
Plugin 'iamcco/markdown-preview.vim' " markdown预览
"Plugin 'Valloric/YouCompleteMe'
"Plugin 'zxqfl/tabnine-vim'
Plugin 'w0rp/ale' " 语法纠错
Plugin 'octol/vim-cpp-enhanced-highlight' " c++语法高亮
Plugin 'Shougo/echodoc.vim' " c++函数提示
Plugin 'Chiel92/vim-autoformat' " c++代码格式化
Plugin 'scrooloose/nerdcommenter' " c++代码注释
Plugin 'ashfinal/vim-colors-violet' " 配色
Plugin 'terryma/vim-multiple-cursors' " vim 多行编辑
Plugin 'mhinz/vim-startify'
call vundle#end()
filetype plugin indent on


set et "tab用空格替换

set tabstop=2
set expandtab
" Tab键的宽度

set softtabstop=2
set shiftwidth=2
"  统一缩进为2

set number
" 显示行号

set history=10000
" 历史纪录数

set hlsearch
set incsearch
" 搜索逐字符高亮

set encoding=utf-8
set fileencodings=utf-8,ucs-bom,shift-jis,gb18030,gbk,gb2312,cp936,utf-16,big5,euc-jp,latin1
" 编码设置

" set mouse=a
" use mouse

set langmenu=zn_CN.UTF-8
set helplang=cn
" 语言设置

set laststatus=2
" 总是显示状态行 就是那些显示 --insert-- 的怪东西

set showcmd
" 在状态行显示目前所执行的命令，未完成的指令片段亦会显示出来

set scrolloff=3
" 光标移动到buffer的顶部和底部时保持3行距离

set showmatch
" 高亮显示对应的括号

set matchtime=1
" 对应括号高亮的时间（单位是十分之一秒）

colorscheme molokai
EOF

vim +PluginInstall +qall

Net Commond

Centos8 IP网络配置

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Centos8重新载入网络设置

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nmcli c up ens32