# singgel/Study-Floder: a GitHub repository that indexes PDF books, with the large files hosted on CSDN

> Study-Floder is a personal reading list stored as a git repository: dozens of PDF books sit in the tree, and the files too large for GitHub are listed in the README as CSDN download links. It is a catalogue, not a tool, and the README is the only interface.

**singgel/Study-Floder** — 相当不错的图书，例如《数学之美》《提问的智慧》《软件工程可靠性》《时间简史》《毛泽东选集【全四卷】》《浪潮之巅》《金字塔原理》《TCP/IP卷一/卷二/卷三》《[荐]深入浅出设计模式》等；一些大的上传受限制的文件《图解TCP_IP_第5版》等在README

- Repository: https://github.com/singgel/Study-Floder
- Stars: 3,091 · Forks: 1,003
- Language: Unknown
- License: MIT
- Published: 2026-09-24 · Updated: 2026-09-24 · Language: en
- Canonical page: https://hysenlabs.com/projects/singgel-study-floder

## What Study-Floder actually is: a git tree full of PDFs

Study-Floder is not software. It is a repository whose top level is a list of PDF files: 数学之美.pdf, 时间简史.pdf, 浪潮之巅.pdf, 深入理解计算机系统.pdf, 设计模式.pdf, 金字塔原理.pdf, 软件工程可靠性.pdf, 提问的智慧.pdf, and roughly thirty more, plus a directory named buffett's letter to shareholders/. The README calls these "相当不错的图书" and points readers to a few of them by title. There is no build step, no package manifest, no source directory, and no releases. The primary language is not detected, which fits a repository made of binary documents rather than code.

The intended audience is narrow: Chinese-speaking engineers and students who want a set of well-known technical and popular-science books in one place, without hunting for each title. The README also links to the author's other repositories on big data, Java, and machine learning, so the project reads as one shelf in a larger personal collection. If you came looking for a study planner, a flashcard app, or anything that runs, this is the wrong repository.

## How the two-tier distribution works

The mechanism is simple and worth stating plainly because it shapes everything else. Small PDFs are committed directly to the repository, so a git clone brings them down. Large PDFs are not in the tree; instead the README lists them as CSDN download URLs, one per line, each with a title. Examples include 图解TCP_IP_第5版.pdf, JAVA并发编程实践, 深入理解Java虚拟机JVM高级特性与最佳实践, effective java, Spring源码深度解析, and 从Lucene到Elasticsearch：全文检索实战.

The README states that these downloads cost 1 积分 (one CSDN point) each, and that readers without points can email the author or open an issue to ask for the file. That is the whole access model. There is no script that fetches the links, no index file, no metadata beyond the filename. The README is the catalogue, which means discovering a book depends on reading Chinese titles in a flat list. The trade-off is deliberate: GitHub has file size limits, so the author offloaded the heavy books to a platform that meters downloads. The cost lands on the reader, who needs a CSDN account with points, or must wait on a manual request.

## Cloning the repository and getting your first book

The README gives no install instructions because there is nothing to install, and it contains no commands at all. What it does give is the repository name and a flat list of titles, some of them with CSDN URLs. The practical first step is to obtain the repository with git, then read the README, because the README is where the large books are indexed. The repository's own name is Study-Floder, under the owner singgel, on the master branch.

Once you have the files locally, the small PDFs are visible directly in the top level of the tree. The README's own list of large titles is the second step: for each book you want, follow the CSDN URL printed next to the title, for example the line beginning 图解TCP_IP_第5版.pdf or the line for 深入理解Java虚拟机JVM高级特性与最佳实践. The README states those downloads cost 1 积分. If you have no points, the README says you can send the author an email or ask in the issues.

There is no command-line interface, no environment variable, and no configuration file to set. Everything the project offers is either a file already in the tree or a URL written in README.md.

## Where this repository fails you

The largest limitation is that the most valuable books are the ones not in the repository. A clone gives you the smaller PDFs; the Java and distributed-systems titles that the README advertises most heavily sit behind CSDN links. If CSDN changes its point system, rotates URLs, or requires a login you do not have, the README becomes a list of dead pointers with no fallback. Nothing in the repository caches those files or records their checksums, so there is no way to verify a download you obtain elsewhere.

The second limitation is maintenance shape. The last push was on 2026-04-07, so the repository has been quiet for over five months. Files can be added without any tooling breaking, but there is no release process, no changelog, and no versioning, so you cannot tell what changed between two clones except by diffing filenames. Third, the repository is a personal collection, not a curated library. Titles range from 毛泽东选集 to 四阶魔方玩法还原教程 to buffett's letter to shareholders, and the README's own categories (big data, Java, machine learning) point to other repositories rather than organizing this one. If you need English-language books, or a catalogue you can query programmatically, this is the wrong tool.

## Alternatives and how they differ

The closest alternative is not another repository but an actual library: Project Gutenberg and similar public-domain archives provide searchable catalogues, stable download URLs, and clear licensing for every title. The difference in approach is that Study-Floder is a hand-assembled folder with no metadata layer, while a public-domain archive is a database with records. If the Chinese technical titles are what you need, a better comparison is a maintained awesome-list or a documentation site that links to official publisher pages and sample chapters, because those links are checked and the material is licensed.

For the specific case of reading on a device, a personal Calibre library or a synced folder on a cloud drive gives you the same files with search, tags, and reading progress. Study-Floder gives you none of that; its advantage is that someone already gathered the files and the README tells you which ones are worth opening. That is a real convenience, but it is a one-time convenience, not a system.

## Licence, cost of upkeep, and what MIT does not cover

The repository declares the MIT licence, and a LICENSE file is present at the top level. MIT is a software licence; it grants permission to use, copy, modify, and distribute the licensed work. Applying it to a repository that contains third-party PDF books does not grant rights to those books. Each PDF carries its own copyright, and redistributing a commercial title is a separate question from the repository's licence. The README itself does not discuss licensing of the books, and the LICENSE file is the only licence artifact in the tree. This is not legal advice; if you plan to redistribute any of these files, the licence text in LICENSE does not settle the question.

Upkeep cost is near zero for the author and non-zero for you. There is nothing to upgrade, no dependencies to patch, and no releases to track. Your cost is storage and the manual work of checking CSDN links. Because there is no manifest, you cannot automate that check; you would have to parse the README yourself.

## What the README does not tell you

The README does not state how many books are in the tree, which titles are in the tree versus on CSDN, or whether the CSDN links are still live. It does not document any way to request a bulk copy, only that you can email or open an issue. It does not say what happens to the repository if the author stops responding. It also does not explain the relationship between this repository and the linked BIGDATA_LINE, JAVA, JAVA_LINE, and AI_LINE repositories beyond recommending them.

One more thing worth noting: the README recommends an external site, bestcbooks.com, and describes the books as "相当不错的图书". Those are the author's judgements, not review data. The repository has no issue templates, no contributing guide, and no CI, which is consistent with a personal reading shelf rather than a project that expects contributions.

## Conclusion

Adopt Study-Floder only if you want a ready-made reading list of Chinese-language technical and popular-science PDFs, and you accept that the large books are gated behind CSDN points, that the README is the only index, and that no releases exist. Skip it if you need a maintained library, English-language material, or a machine-readable catalogue. Before relying on it, open the README and confirm that the CSDN links for the books you want still resolve, then check the LICENSE file, which the repository lists as MIT even though the PDFs carry their own copyrights.

## FAQ

### How do I download the large books in singgel/Study-Floder?

The README lists the large titles as CSDN download links, one per line, and states that each download costs 1 积分. If you do not have CSDN points, the README says you can email the author or ask in the issues.

### Does singgel/Study-Floder include the PDFs in the repository itself?

Some do. The top-level tree contains PDF files such as 数学之美.pdf, 时间简史.pdf, and 深入理解计算机系统.pdf, while larger books like 图解TCP_IP_第5版.pdf are only linked from the README as CSDN downloads.

### Is singgel/Study-Floder still maintained?

The last push to the repository was on 2026-04-07, and no releases have been published. Files can still be added, but there is no changelog or release process to track changes.

### What licence applies to the books in singgel/Study-Floder?

The repository declares the MIT licence and includes a LICENSE file at the top level. The README does not address the copyright of the individual PDF books, which carry their own terms.

## Sources

- [Issues](https://github.com/singgel/Study-Floder/issues)
- [License: MIT](https://github.com/singgel/Study-Floder/blob/master/LICENSE)
- [README](https://github.com/singgel/Study-Floder/blob/master/README.md)
- [singgel/Study-Floder on GitHub](https://github.com/singgel/Study-Floder)

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Hysen Labs editorial analysis, written from the project's own repository and release notes. Cite the canonical page: https://hysenlabs.com/projects/singgel-study-floder