Spring配置和使用Properties文件的详细步骤

# application.properties
app.name=MyApplication
app.version=1.0.0
database.url=jdbc:mysql://localhost:3306/mydb
database.username=root
database.password=secret

@Component
@ConfigurationProperties(prefix="app")
public class AppConfig {
    private String name;
    private String version;

    // getters and setters
}

@Configuration
@PropertySource("classpath:application.properties")
public class AppConfig {
    // 配置类内容
}

@Component
public class SomeComponent {

    @Autowired
    private Environment env;

    public void someMethod() {
        String appName = env.getProperty("app.name");
        // 使用 appName
    }
}

app.description=${app.name} is a Spring Boot application

# application-dev.properties
app.env=development

# application-prod.properties
app.env=production

spring.profiles.active=dev

java -jar myapp.jar --spring.profiles.active=prod

@Configuration
@PropertySource(value = "file:${custom.config.path}/custom-application.properties", ignoreResourceNotFound = true)
public class CustomConfig {
    // 配置类内容
}

@Component
@ConfigurationProperties(prefix="app.dev")
public class DevAppConfig {
    // 针对开发环境的配置
}

@Component
@ConfigurationProperties(prefix="app.prod")
public class ProdAppConfig {
    // 针对生产环境的配置
}