如何在spring中重写PropertiesFactoryBean？

import org.springframework.beans.factory.config.PropertiesFactoryBean;
import org.springframework.core.io.Resource;
import org.springframework.core.io.ResourceLoader;

import java.io.IOException;
import java.util.Properties;

public class CustomPropertiesFactoryBean extends PropertiesFactoryBean {

    private ResourceLoader resourceLoader;

    public void setResourceLoader(ResourceLoader resourceLoader) {
        this.resourceLoader = resourceLoader;
    }

    @Override
    protected Properties loadProperties() throws IOException {
        Properties properties = new Properties();
        Resource resource = resourceLoader.getResource("classpath:custom.properties");
        properties.load(resource.getInputStream());
        // 对属性文件进行处理，例如解密加密的属性值，或者对属性值进行验证等
        return properties;
    }

    // 添加其他自定义的方法或属性

}

<bean id="customProperties" class="com.example.CustomPropertiesFactoryBean">
    <property name="resourceLoader" ref="resourceLoader" />
</bean>

@Autowired
private Properties customProperties;