linux shallow use

1. The second stage knowledge points combing

1.1 JavaSE

1.1.1 I.

• IO stream: realize data interaction between the program and external devices (files, networks, other programs)

• Common flow

  • Byte stream:

    • Input stream: FileInputStream, BufferedInputStream

    • Output stream: FileOutputStream, PrintStream

  • Character stream:

    • Input stream: InputStreamReader (conversion stream), BufferedReader

    • Output stream: PrintWriter

  • Object flow:

    • Object serialization: ObjectOutputStream (Object -> File)

    • Object serialization: ObjectInputStream (File-->Object)

  • Random access stream: RandomAccessFile

• NIO

  • new IO read and write operations for the buffer period

  • NIO concept

  • NIO case

1.1.2 Multithreading

• The concept of threads

  • Thread and process go chant

• Thread creation: inherit Thread, implement Runnable interface, thread pool

• Basic thread attributes: thread name, priority, daemon thread

• The state of the thread: new, runnable, running, blocked, destroyed

• Thread blocking events: wait, sleep, join...

• Thread synchronization: lock object, lock method, synchronization lock

• Thread Pool

• Producer and consumer

1.1.3 Network programming

• Network concept: IP, PORT, TCP, UDP

• TCP：ServerSocket，Socket

• UDP: DatagramSocket, DatagramPacket, multicast communication (extended)

1.1.4 New Features of JDK8

• Lambda

• Functional interface

• Stream

• Interface default method (JDK7 can only define abstract methods in the interface before, JDK8 interface default method refers to the method with method body can be defined in the interface)

• Timestamp

1.2 Advanced JDBC

• Database connection pool

• DBUtils

• DAO package

1.3 Java web：JSP/Servlet

1.3.1 JSP

• JSP file structure

  • Compilation instructions:

    • page <%@ page language="java" pageEncoding="UTF-8" %>

    • taglib <%@ taglib prefic="c" uri="http://java.sun.com/jsp/jstl/core" %>

    • include <%@ include file="a.jsp"%>

  • Action instructions:

    • <jsp:cmd />

  • Various tags in JSP

    • <% %>

    • <%= %>

• JSP nine built-in objects

1.3.2 Servlet

• Servlet life cycle

• Servlet使用（request、response、session、cookie）

• File upload and download

• Pagination

• MVC layered thinking

• Filter

• Listener (session listener)

1.4 Front-end framework

• BootStrap

• jQuery

  • grammar

  • Selector

  • Element attributes and style operations

  • Document operation

  • Animation: 2D and 3D deformation

  • ajax

• jQuery easyUI

• echarts icon

1.5 SSM

1.5.1 Framework basics

• reflection

• xml parsing

• annotation

1.5.2 Spring

• IoC 与 IN

• AOP

  • Explanation: What is aspect-oriented programming?

  • Noun comprehension: connection point, entry point, tangent point, cut surface

• Spring JDBC

• Spring transaction management

1.5.3 MyBatis

• CRUD operations

• Mapping file configuration (resultMap)

• Dynamic SQL

• Cache

• Lazy loading

1.5.4 SpringMVC

• SpringMVC request processing flow (SpringMVC principle)

   

Second, the third stage technical points preview

Distributed development phase

• Linux

• vue (front-end framework)

• SpringBoot

• Shiro (v8)

• SpringCloud

• Redis

• IT IS

• SQM

• Distributed Transaction (LcN Tcc)

Three, Linux introduction

Background: Java projects are usually developed based on the windows system, and the server is not familiar with Linux based on

3.1 Linux system overview

• Linux is a free-to-use and freely spread Unix-like operating system

• Support multi-user, multi-any, multi-thread and multi-CPU operating system

• Linux is usually used as a server system (windows server is also a system suitable for servers)

3.2 Features of Linux system

• Performance is more stable than window (lower downtime probability)

• Fully open source, users can freely tailor, high flexibility, low cost of use

• Many technical community users

• Linux core firewall components have high performance and simple configuration to ensure system security

• For linux to provide a pure command line system (also with a desktop), the system overhead is much smaller than that of windows

• In summary, Linux is more suitable for server systems than windows

3.3 Linux system version

• RedHat (Linux version issued by RedHat company, high efficiency, high scalability, high reliability)

• SUSE (Linux distribution released by German SUSE company)

• DEbian (pursuing to create a free operating system, there are currently many unofficial versions, and the availability is not high)

• Ubuntu (Uban map, based on DEbian release, desktop system, is a linux system based on desktop applications)

• CentOS (compiled based on RedHat source code, CentOS is completely open source)

• Red Flag Linux

• OS X is a Linux system

Four, virtual machine

How to obtain a Linux system?

• 1. Hardware-based installation of Linux (install dual system)

• 1. Install a virtual machine: In the current windows environment, install a virtual machine software and simulate a computer through this software (occupying resources)

• 1. Rent a cloud host

4.1 Introduction to Virtual Machine

• Use software to simulate the hardware environment-virtual machine

4.2 Install VMware

VMware Workstation—Virtual machine software used to create and manage virtual machines

4.2.1 Download

Download link: https://www.vmware.com/content/vmware/vmware-published-sites/us/products/workstation-pro/workstation-pro-evaluation.html.html

4.2.2 Installation

Silly installation (default next step)

4.3 Download the installation image of CentOS

Download link: https://www.centos.org/download/

4.4 Create a virtual machine

Steps (omitted)

4.5 Install CentOS

Steps (omitted)

4.6 Enter CentOS

• Check the network configuration: applications-->Terminal

  ifconfig

• System state switching

  init 3 switch to the command line state 
  init 5 switch to the desktop state

4.7 Virtual machine cloning

4.7.1 Clone

Select the target virtual machine-->Right click-->Manage-->Clone-->Select full clone

4.7.2 Modify mac

Select the cloned virtual machine-->Right click-->Settings-->Network adapter-->Advanced-->Mac address (generated)-->OK

Five, cloud host

5.1 What is a cloud host?

• Cloud hosting is a virtualization technology similar to VPS hosting. One host (host cluster) virtualizes multiple parts similar to independent hosts, which can realize single machine multi-user, and each part can be used as a separate operating system and management method. Same as the host.

• A cloud host is a virtual system built on multiple hosts (host clusters). Each host in the cluster has a mirror image of the cloud host, which greatly improves the security and stability of the virtual cloud host

5.2 Enough to buy cloud hosting

Recommend Ali, Tencent

Ali: Students under the age of 24 are exempt from certification and enjoy student preferential policies; students over 24 need student certification

Tencent: 25 years old

5.3 Cloud host management

• Manage the status of the cloud host through the Alibaba Cloud console

  • Start, stop, restart

  • Set instance password

  • Custom instance image

• Security group management