springboot配置
依赖
以下为该测试的依赖，仅依赖了springboot的web启动器与演示的druid连接池，spring-boot-configuration-processor是为了避免@ConfigurationProperties报错
<?xml version="1.0" encoding="UTF-8"?>
<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.3.1.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>demo</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.1.6</version>
</dependency>
<!--解决@ConfigurationProperties报错-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-configuration-processor</artifactId>
<!--禁止传递依赖-->
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
</exclusions>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
配置文件jdbc.properties
jdbc.driverClassName=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://192.168.25.134:3306/atm
jdbc.username=root
jdbc.password=root
@PropertySource与@Value注入配置类
package com.example.demo.config;
import com.alibaba.druid.pool.DruidDataSource;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;
import javax.sql.DataSource;
@Configuration
@PropertySource("classpath:jdbc.properties")
public class JdbcConfig {
@Value("${jdbc.url}")
String url;
@Value("${jdbc.driverClassName}")
String driverClassName;
@Value("${jdbc.username}")
String username;
@Value("${jdbc.password}")
String password;
@Bean
public DataSource dataSource(){
DruidDataSource dataSource = new DruidDataSource();
dataSource.setDriverClassName(driverClassName);
dataSource.setUrl(url);
dataSource.setUsername(username);
dataSource.setPassword(password);
return dataSource;
}
}
优雅的配置
1、文件名要求
将jdbc.properties修改名称为application.properties；
2、配置javaBean
package com.example.demo.config;
import org.springframework.boot.context.properties.ConfigurationProperties;
/**
* @Description TODO
* @Author xsl
* @Date 2020/7/7 1:13
**/
//jdbc为配置项前缀,必须要有get、set方法
@ConfigurationProperties(prefix = "jdbc")
public class JdbcProperties {
/**
* 数据库url
*/
private String url;
/**
* 驱动
*/
private String driverClassName;
/**
* 用户名
*/
private String username;
/**
* 密码
*/
private String password;
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
public String getDriverClassName() {
return driverClassName;
}
public void setDriverClassName(String driverClassName) {
this.driverClassName = driverClassName;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
}
3、配置注入类
package com.example.demo.config;
import com.alibaba.druid.pool.DruidDataSource;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import javax.sql.DataSource;
/**
* @Description 连接池配置
* @Author xsl
* @Date 2020/7/7 1:00
**/
@Configuration
@EnableConfigurationProperties(JdbcProperties.class)
public class DataSourceConfig {
@Bean
public DataSource dataSource(JdbcProperties properties){
DruidDataSource druidDataSource = new DruidDataSource();
druidDataSource.setDriverClassName(properties.getDriverClassName());
druidDataSource.setUrl(properties.getUrl());
druidDataSource.setUsername(properties.getUsername());
druidDataSource.setPassword(properties.getPassword());
return druidDataSource;
}
}
4.更优雅的配置
package com.example.demo.config;
import com.alibaba.druid.pool.DruidDataSource;
import org.springframework.boot.context.properties.ConfigurationProperties;
import
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import javax.sql.DataSource;
/**
* @Description 连接池配置
* @Author xsl
* @Date 2020/7/7 1:00
**/
@Configuration
public class DataSourceConfig {
@Bean
@ConfigurationProperties(prefix = "jdbc")
public DataSource dataSource(){
return new DruidDataSource();
}
}
yml配置
多个yml文件配置
1、配置文件的激活与配置格式
可以将多个yml文件在application.yml文件中配置激活，yml与properties配置文件除了展示形式不相同以外，其它功能和作用都是一样的；在项目中原路的读取方式不需要改变。
1）yml配置文件的特征：
- 树状层级结构展示配置项；
- 配置项之间如果有关系的话需要分行空两格；
- 配置项如果有值的话，那么需要在
:之后空一格再写配置项值；
示例：
jdbc:
#层级之间空两空格，键值之间差一个空格
driverClassName: com.mysql.jdbc.Driver
url: jdbc:mysql://127.0.0.1:3306/atm
username: root
password: root
key:
abc: cba
#集合使用换行 - value的方式
def:
- g
- f
2）多个yml配置文件；在spring boot中是被允许的。这些配置文件的名称必须为application-***.yml，并且这些配置文件必须要在application.yml配置文件中激活之后才可以使用。
spring:
# 环境 dev:开发环境|test:测试环境|prod:生产环境
profiles:
active: dev #激活的配置文件
3）如果properties和yml配置文件同时存在在spring boot项目中；那么这两类配置文件都有效。在两个配置文件中如果存在同名的配置项的话会以properties文件的为主。