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🍁@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);
}
}
测试结果是个八进制的83。
⭐⭐⭐注意：根据字面值表达方式，String类型的需要使用双引号包裹。🔥重新编写application.yml
servers:
ipAddress: 168.225.0.15
port: 1234
timeout: -1
dataSource:
driverClassName: com.mysql.jdbc.Driver
password: "0123"运行结果：
