ServiceLoader使用

1 定义接口
import java.util.List;
import java.util.Map;
public interface BaseConfig {
    boolean match(String fileName);
    Boolean existHead();
}
2 定义实现类

public class TradeCodeManyLineRbtrConfig extends BaseConfig {

    @Override
    public Boolean existHead() {
        return Boolean.TRUE;
    }

    @Override
    public boolean match(String fileName) {
        return Pattern.matches(INCRBTR_FILE_REGEX, fileName);
    }
}

3 配置实现类

4 定义工厂

import java.util.Iterator;
import java.util.ServiceLoader;
public class FileParserConfigFactory {
    private FileParserConfigFactory() {}
    public static BaseConfig getFileParserConfig(String fileName) {
        ServiceLoader<BaseConfig> serviceLoader =
                ServiceLoader.load(BaseConfig.class);
        Iterator<BaseConfig> it = serviceLoader.iterator();
        while (it.hasNext()) {
            BaseConfig service = it.next();
            if (service.match(fileName)) {
                return service;
            }
        }
        return null;
    }
}