使用springboot配置和注入数据源属性的方法和步骤

  /**

    1、书写一个名为resources/application.properties的属性文件---->书写一个配置属性类，类名为：

**/

    文件：application.properties

jdbc.driverClassName=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://192.168.28.128
jdbc.username=orcl
jdbc.password=123456

文件：JdbcProperties

package com.hope.config;

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

/**
 * @author newcityman
 * 使用lombok插件
 * @date 2019/12/16 - 0:59
 */
@ConfigurationProperties(prefix = "jdbc")
@Data
public class JdbcProperties {
    String driverClassName;
    String url;
    String username;
    String password;
}

package com.hope.config;

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

import javax.sql.DataSource;

/**
 * @author newcityman
 * @Bean 把类的返回值注入到spring核心容器便于调用
 * @date 2019/12/15 - 23:52
 */
@Configuration
/*@PropertySource("classpath:application.properties")*/
@EnableConfigurationProperties(JdbcProperties.class)
public class JdbcConfig {
    @Bean
    public DataSource dataSource(JdbcProperties jp){
        DruidDataSource dataSource = new DruidDataSource();
        dataSource.setDriverClassName(jp.getDriverClassName());
        dataSource.setUrl(jp.getUrl());
        dataSource.setUsername(jp.getUsername());
        dataSource.setPassword(jp.getPassword());
        return dataSource;
    }
}

package com.hope;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.bind.annotation.RestController;

/**
 * @author newcityman
 * @date 2019/12/15 - 23:09
 */
@SpringBootApplication
public class BootDemoApplication {
    public static void main(String[] args) {
        SpringApplication.run(BootDemoApplication.class,args);
    }
}

package com.hope.web;

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

import javax.sql.DataSource;

/**
 * @author newcityman
 * @date 2019/12/15 - 23:28
 */
@RestController
public class HelloController {
    @Autowired
    private DataSource dataSource;

    @GetMapping("hello")
    @ResponseBody
    public String Hello(){
        return "hello zmy，你好";
    }
}