springboot入门1

1引入springboot父依赖，和 spring-boot-starter-web的启动器

依赖引入后jar包展示依赖的情况

入门工程  配置数据源

package com.boot.web.config;

import lombok.Data;
import org.springframework.boot.context.properties.ConfigurationProperties;

//配置属性注解
@ConfigurationProperties(prefix = "jdbc")
@Data//get set
public class JdbcProperties {

    private String driverClassName;
    private String url;
    private String username;
    private String password;

}

package com.boot.web.config;

import com.alibaba.druid.pool.DruidDataSource;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import javax.sql.DataSource;

@EnableConfigurationProperties(JdbcProperties.class)//使用配置属性
@Configuration
//@PropertySource(value = "classpath:jdbc.properties.bak")//注释掉spring的属性注入方式
public class JdbcConfig {

    //spring配置文件属性注入  封装  spring注入方式
    //@Value("${jdbc.driverClassName}")
    //private String driverClassName;
    //@Value("${jdbc.url}")
    //private String url;
    //@Value("${jdbc.username}")
    //private String username;
    //@Value("${jdbc.password}")
    //private String password;

    @Bean(value = "dataSource")//默认bean名称为方法名
    public DataSource getDataSource(JdbcProperties properties){
        DruidDataSource dataSource = new DruidDataSource();
        //属性配置  注入
        dataSource.setUrl(properties.getUrl());
        dataSource.setDriverClassName(properties.getDriverClassName());
        dataSource.setUsername(properties.getUsername());
        dataSource.setPassword(properties.getPassword());
        return dataSource;
    }

    //@Bean
    //@ConfigurationProperties(prefix = "jdbc")
    //public DataSource getDataSource(){
    //    DataSource dataSource = new DruidDataSource();
    //    return dataSource;
    //}

}

jdbc:
  driverClassName: com.mysql.jdbc.Driver
  url: jdbc:mysql://127.0.0.1:3306/mybatis
  username: root
  password:
spring:
  mvc:
    view:
      suffix: .jsp
      prefix: /WEB-INF/views/
server:
  port: 

application.yml

package com.boot;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
//1声明配置 2自动配置 3扫描包
@SpringBootApplication
public class BootDemoApplication {

    public static void main(String[] args) {
        SpringApplication.run(BootDemoApplication.class);
    }

}

package com.boot.web.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.sql.DataSource;

@RestController
public class HelloController {

    @Autowired
    private DataSource dataSource;

    @GetMapping("hello")
    public String hello() {
        return "hello ,spring boot!";
    }

}

controller

简单总结：引依赖  加注解  加配置  三部曲！

1.maven工程（war）

2引入boot父依赖，引入web启动器，引入数据库连接池依赖

3书写springconfig配置类（加注解），application.yml配置文件（数据路连接池配置 4大参数）

4controller测试，同时测试di注入连接池对象是否有值注入成功。