web开发简单知识

springboot

快速入门

配置pom.xml文件
官网获取https://docs.spring.io/spring-boot/docs/2.1.6.RELEASE/reference/html/getting-started-installing-spring-boot.html#getting-started-maven-installation

<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0modelVersion>

    <groupId>org.examplegroupId>
    <artifactId>springbootartifactId>
    <version>1.0-SNAPSHOTversion>

    
    <parent>
        <groupId>org.springframework.bootgroupId>
        <artifactId>spring-boot-starter-parentartifactId>
        <version>2.1.6.RELEASEversion>
    parent>

    <dependencies>
        
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-webartifactId>
        dependency>
    dependencies>

project>

书写一个控制类

package com.controll;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class hellocontroller {
    @RequestMapping("/hello")
public String hello(){
    return "hello spring boot";
}
}

书写一个引导类

package com;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class helloapplication {
    public static void main(String[] args) {
        SpringApplication.run(helloapplication.class,args);
    }
}

在引导类文件中启动项目。

快速构建SpringBoot工程

https://www.bilibili.com/video/BV1Lq4y1J77x?p=5&vd_source=fce42173caa30698e3df32059b6f9232

起步依赖原理分析

1. spring-boot-starter-parent
2. spring-boot-starter-web
   

springboot配置

配置文件分类

yaml的基本语法

简洁，以数据为核心

yaml数据格式

server:
  port: 8082

name: abc
#对象
person:
  name: zhangsan
  age: 20

#对象行内写法
person2: {name: zhangsan,age: 20}

#数组
address:
  - beijing
  - shanghai

#数组行内写法
address2: [beijing,shanghai]

#纯量
msg1: 'hello \n world' #不会识别转义字符，会原样输出
msg2: "hello \n world" #会识别转义字符

获取数据

@RestController
public class hellocontroller {

    @Value("${name}")//第一种方法
    private String name;

    @Value("${msg1}")//纯量
    private String msg1;

    @Value("${msg2}")
    private String msg2;

    @Value("${person.name}")
    private String name2;

    @Value("${address[0]}")//数组
    private String addresss;

    @Value("${person.age}")
    private int age;

    @Autowired//第二种方法
    private Environment env;

    @Autowired//第三种方法
    private person person;

    @RequestMapping("/hello2")
    public String hello2(){
        System.out.println(addresss);
        System.out.println(msg1);
        System.out.println(msg2);
        System.out.println(name2);
        System.out.println(age);
        System.out.println("------------------------");
        System.out.println(env.getProperty("person.name"));
        System.out.println(env.getProperty("address[0]"));
        System.out.println("---------------------");
        System.out.println(person);


        return "hello spring boot";
    }

    @RequestMapping("/hello")
      public String hello(){
    return "hello spring boot";
}
}

perosn:

@Component
@ConfigurationProperties(prefix="person")
public class person {

    private String name;
    private int age;


    public void setName(String name) {
        this.name = name;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public String getName() {
        return name;
    }

    public int getAge() {
        return age;
    }

    @Override
    public String toString() {
        return "person{" +
                "name='" + name + '\'' +
                ", age=" + age +
                '}';
    }

}

profile

激活后缀名为pro的配置文件

---  #可以分割为不同几个区域
server:
  port: 8081
spring:
  profiles: dev

---
server:
  port: 8082
spring:
  profiles: test

---
server:
  port: 8083
spring:
  profiles: pro

---
spring:
  profiles:
    active: pro

虚拟机和程序参数也可以激活
虚拟机：-Dspring.profiles.active=pro
程序参数：--spring.profiles.active=test

内部配置加载顺序

外部配置加载顺序

视频链接
通过官网查看优先级

https://docs.spring.io/spring-boot/docs/2.1.6.RELEASE/reference/html/boot-features-external-config.html

springboot整合

整合junit

整合redis

整合mybatis

springboot原理分析

springboot自动配置

Condition

链接: 视频链接

监听机制

启动流程分析

springboot监控

项目部署

git

mybatis-plus

项目实战