将字符串值映射到Spring中的bean

public class MyBean {
    @Value("Hello, World!")
    private String myString;

    // getter and setter methods
}

// 在Spring的配置文件中配置属性占位符
<context:property-placeholder location="classpath:config.properties" />

// config.properties文件内容
myString=Hello, Spring!

// 使用MyBean
public class MyApp {
    public static void main(String[] args) {
        ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
        MyBean myBean = context.getBean(MyBean.class);
        System.out.println(myBean.getMyString()); // 输出：Hello, Spring!
    }
}