private PageEntity<HotelEsSource> genEntityByFile(String fileName) throws IOException {
    String json_Str = readToString(new File(getRoodDir() + fileName));
    return JSON.parseObject(json_Str, new TypeReference<PageEntity<HotelEsSource>>() {
    });
}

public class PageEntity<T> {

    private List<T> result;

    private Long totalSize;

    public List<T> getResult() {
        return result;
    }

    public void setResult(List<T> result) {
        this.result = result;
    }

    public Long getTotalSize() {
        return totalSize;
    }

    public void setTotalSize(Long totalSize) {
        this.totalSize = totalSize;
    }
}