【Java Web】从配置修改静态变量

对象

@ConfigurationProperties(prefix = "system-upload-prefix")
@Configuration
@RefreshScope
@Data
public class SystemUploadPrefix {
    private String upload;
}

修改常量

@Component
public class Constants {
    @Autowired
    SystemUploadPrefix systemUploadPrefix;

    @PostConstruct
    public void loadSystemUploadPrefix() {
        UPLOAD_DEFAULT_PREFIX_URL = systemUploadPrefix.getUpload();
    }

    public static String UPLOAD_DEFAULT_PREFIX_URL = "/upload/";
}

nacos修改后刷新

import com.alibaba.cloud.nacos.NacosConfigManager;
import com.alibaba.nacos.api.config.ConfigChangeEvent;
import com.alibaba.nacos.api.config.ConfigChangeItem;
import com.alibaba.nacos.client.config.listener.impl.AbstractConfigChangeListener;
import com.deyatech.common.Constants;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;

@Component
public class NacosConfigListener extends AbstractConfigChangeListener implements InitializingBean {
    @Resource
    private NacosConfigManager nacosConfigManager;
    @Override
    public void afterPropertiesSet() throws Exception {
        nacosConfigManager.getConfigService().addListener("global.yaml", "DEFAULT_GROUP", this);
    }

    @Override
    public void receiveConfigChange(ConfigChangeEvent event) {
        for (ConfigChangeItem changeItem : event.getChangeItems()) {
            String value = changeItem.getNewValue();
            String key = changeItem.getKey();
            if (key.equals("system-upload-prefix.upload")) {
                Constants.UPLOAD_DEFAULT_PREFIX_URL = value;
                System.out.println("Listener UPLOAD_DEFAULT_PREFIX_URL -> " + Constants.UPLOAD_DEFAULT_PREFIX_URL);
            }
            if (key.equals("system-upload-prefix.secureAqMl")) {
                Constants.UPLOAD_SECURE_PREFIX_URL = value;
                System.out.println("Listener UPLOAD_SECURE_PREFIX_URL -> " + Constants.UPLOAD_SECURE_PREFIX_URL);
            }
            if (key.equals("system-upload-prefix.sourceMaterial")) {
                Constants.UPLOAD_SOURCE_MATERIAL_URL = value;
                System.out.println("Listener UPLOAD_SOURCE_MATERIAL_URL -> " + Constants.UPLOAD_SOURCE_MATERIAL_URL);
            }
        }
    }

}