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SpringBoot万字爆肝高级配置

2024-04-02 19:04:59 234人浏览八月长安

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摘要

目录@ConfigurationProperties注入创建一个新的模板ServerConfig.java编写application.yml编写ConfigurationApplic

@ConfigurationProperties注入

创建一个新的模板

此过程就不在这介绍了，在我SpringBoot专栏里有详细过程。

⭐⭐⭐注意的是加入所需的支持这什么也不勾选。

ServerConfig.java

package com.jkj.config;
import lombok.Data;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;
@ConfigurationProperties(prefix = "servers")
@Component
@Data
public class ServerConfig {
    private String ipAddress;
    private int port;
    private long timeout;
}

⭐⭐⭐注意：

@Data

为当前实体类在编译期设置对应的get/set,toString方法,hashCode方法,equals方法等。

需要导入lomok的依赖：

<dependency>
			<groupId>org.projectlombok</groupId>
			<artifactId>lombok</artifactId>
		</dependency>

编写application.yml

servers:
ipAddress: 168.225.0.15
port: 1234
timeout: -1

编写ConfigurationApplication.java

@SpringBootApplication
public class ConfigurationApplication {
	public static void main(String[] args) {
		ConfigurableApplicationContext cac = SpringApplication.run(ConfigurationApplication.class, args);
		ServerConfig bean = cac.getBean(ServerConfig.class);
		System.out.println(bean); 
	}
}

运行结果：ServerConfig(ipAddress=168.225.0.15, port=123456, timeout=-1)

给第三方Bean绑定属性

方式一

?编写ConfigurationApplication.java

@SpringBootApplication
public class ConfigurationApplication {
    @Bean
	public DruidDataSource dataSource(){
		DruidDataSource ds = new DruidDataSource();
		ds.setDriverClassName("com.Mysql.jdbc.Driver");
		return ds;
	}
	public static void main(String[] args) {
		ConfigurableApplicationContext cac = SpringApplication.run(ConfigurationApplication.class, args);
		ServerConfig bean = cac.getBean(ServerConfig.class);
		System.out.println(bean); 
		DruidDataSource ds = cac.getBean(DruidDataSource.class);
		System.out.println(ds);
	}
}

运行结果：com.mysql.jdbc.Driver

方式二

使用@ConfigurationProperties为第三方bean绑定属性

?编写application.yml

servers:
ipAddress: 168.225.0.15
port: 1234
timeout: -1
dataSource:
driverClassName: com.mysql.jdbc.Driver

?编写ConfigurationApplication.java

@SpringBootApplication
public class ConfigurationApplication {
    @Bean
    @ConfigurationProperties(prefix = "datasource")
	public DruidDataSource dataSource(){
		DruidDataSource ds = new DruidDataSource();
		return ds;
	}
	public static void main(String[] args) {
		ConfigurableApplicationContext cac = SpringApplication.run(ConfigurationApplication.class, args);
		ServerConfig bean = cac.getBean(ServerConfig.class);
		System.out.println(bean); 
		DruidDataSource ds = cac.getBean(DruidDataSource.class);
		System.out.println(ds.getDriverClassName()); 
	}
}

运行结果：com.mysql.jdbc.Driver

@EnableconfigurationProperties

@EnableConfigurationProperties注解可以将使用@ConfigurationProperties注解对应的类加入Spring容器

?ConfigurationApplication.java

@SpringBootApplication
@EnableConfigurationProperties(ServerConfig.class)
public class ConfigurationApplication {
    @Bean
    @ConfigurationProperties(prefix = "datasource")
	public DruidDataSource dataSource(){
		DruidDataSource ds = new DruidDataSource();
		return ds;
	}
	public static void main(String[] args) {
		ConfigurableApplicationContext cac = SpringApplication.run(ConfigurationApplication.class, args);
		ServerConfig bean = cac.getBean(ServerConfig.class);
		System.out.println(bean); 
		DruidDataSource ds = cac.getBean(DruidDataSource.class);
		System.out.println(ds.getDriverClassName()); 
	}
}

?ServerConfig.java

package com.jkj.config;
import lombok.Data;
import org.springframework.boot.context.properties.ConfigurationProperties;
@ConfigurationProperties(prefix = "servers")
@Data
public class ServerConfig {
    private String ipAddress;
    private int port;
    private long timeout;
}

⭐⭐⭐注意：@EnableConfigurationProperties与@Component不能同时使用

解除使用@ConfigurationProperties注释警告

加入依赖：

<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-configuration-processor</artifactId>
		</dependency>

宽松绑定

宽松绑定就是configrationProperties注入的书写规范并不严格，大小写，下划线、中划线、springboot都可以忽略。
@ConfigurationProperties绑定属性支持属性名宽松绑定。

以ipAddress为例：

?驼峰模式

ipAddress: 168.225.0.15

?下划线模式

ip_address: 168.225.0.15

?中划线模式

IP_ADD_R-E-SS: 168.225.0.15

?常量模式

IP_ADDRESS: 168.225.0.15

?大写模式

IPADDRESS: 168.225.0.15

?烤肉串模式(推荐使用)

ip-address: 168.225.0.15

宽松绑定不支持注解@Value引用单个属性的方式

?测试：

package com.jkj;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.test.context.SpringBootTest;
@SpringBootTest
class Springboot06ConfigurationApplicationTests {
    @Value("${servers.ipAddress}")
	private String msg;
	@Test
	void contextLoads() {
		System.out.println(msg); 
	}
}

报错信息：Could not resolve placeholder 'servers.ipAddress' in value "${servers.ipAddress}"

常量计量单位绑定

SpringBoot支持jdk8提供的时间与空间计量单位

package com.jkj.config;
import lombok.Data;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.convert.DataSizeUnit;
import org.springframework.boot.convert.DurationUnit;
import org.springframework.util.unit.DataSize;
import org.springframework.util.unit.DataUnit;
import java.time.Duration;
import java.time.temporal.ChronoUnit;
@ConfigurationProperties(prefix = "servers")
@Data
public class ServerConfig {
    private String ipAddress;
    private int port;
    private long timeout;
    @DurationUnit(ChronoUnit.DAYS)
    private Duration serverTimeOut;
    @DataSizeUnit(DataUnit.TERABYTES)
    private DataSize dataSize;
}

?常用计量单位 ChronoUnit

DataUnit

数据校验

?添加了SR303规范坐标与Hibernate校验框架对应坐标

	<dependency>
			<groupId>javax.validation</groupId>
			<artifactId>validation-api</artifactId>
		</dependency>

?使用hibernate框架提供的校验器做实现类

<dependency>
			<groupId>org.hibernate.validator</groupId>
			<artifactId>hibernate-validator</artifactId>
		</dependency>

?对Bean开启校验功能

@ConfigurationProperties(prefix = "servers")
@Validated
@Data
public class ServerConfig {
    private String ipAddress;
    private int port;
    private long timeout;
}

?设置校验规则

@ConfigurationProperties(prefix = "servers")
@Validated
@Data
public class ServerConfig {
    private String ipAddress;
    @Max(value = 9999,message = "最大值不能超过9999")
    @Min(value = 1111,message = "最小值不能超过1111")
    private int port;
    private long timeout;
}

?yml文件中port设置为1234，测试结果如下

进制数据转换规则

案例模拟

?编写application.yml

servers:
ipAddress: 168.225.0.15
port: 1234
timeout: -1
dataSource:
driverClassName: com.mysql.jdbc.Driver
passWord: 0123

?编写ConfigureApplication,java

package com.jkj;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.test.context.SpringBootTest;
@SpringBootTest
class Springboot06ConfigurationApplicationTests {
    @Value("${dataSource.Password}")
	private Password psw;
	@Test
	void contextLoads() {
		System.out.println(psw); 
	}
}