如何从application.properties中读取

import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.PropertySource;
import org.springframework.stereotype.Component;

@Component
@PropertySource("classpath:application.properties")
public class Config {
    @Value("${key}")
    private String value;

    public String getValue() {
        return value;
    }
}

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

@Component
public class MyClass {
    private final Config config;

    @Autowired
    public MyClass(Config config) {
        this.config = config;
    }

    public void doSomething() {
        String value = config.getValue();
        // 使用配置值进行相应的操作
    }
}