📅 最后修改于: 2020-10-31 14:35:02 🧑 作者: Mango
Feed导出是一种存储从站点抓取的数据的方法，该方法会生成“导出文件” 。
Feed Exports使用多种序列化格式和存储后端，使用Item导出程序并生成包含刮擦项的feed。
下表显示了受支持的格式-
| Sr.No | Format & Description |
|---|---|
| 1 |
JSON FEED_FORMAT is json Exporter used is class scrapy.exporters.JsonItemExporter |
| 2 |
JSON lines FEED_FROMAT is jsonlines Exporter used is class scrapy.exporters.JsonLinesItemExporter |
| 3 |
CSV FEED_FORMAT is CSV Exporter used is class scrapy.exporters.CsvItemExporter |
| 4 |
XML FEED_FORMAT is xml Exporter used is class scrapy.exporters.XmlItemExporter |
使用FEED_EXPORTERS设置，还可以扩展支持的格式-
| Sr.No | Format & Description |
|---|---|
| 1 |
Pickle FEED_FORMAT is pickel Exporter used is class scrapy.exporters.PickleItemExporter |
| 2 |
Marshal FEED_FORMAT is marshal Exporter used is class scrapy.exporters.MarshalItemExporter |
存储后端定义使用URI将提要存储在何处。
下表显示了受支持的存储后端-
| Sr.No | Storage Backend & Description |
|---|---|
| 1 |
Local filesystem URI scheme is file and it is used to store the feeds. |
| 2 |
FTP URI scheme is ftp and it is used to store the feeds. |
| 3 |
S3 URI scheme is S3 and the feeds are stored on Amazon S3. External libraries botocore or boto are required. |
| 4 |
Standard output URI scheme is stdout and the feeds are stored to the standard output. |
以下是存储URL的参数，在创建提要时将替换它们-
下表显示了可用于配置Feed导出的设置-
| Sr.No | Setting & Description |
|---|---|
| 1 |
FEED_URI It is the URI of the export feed used to enable feed exports. |
| 2 |
FEED_FORMAT It is a serialization format used for the feed. |
| 3 |
FEED_EXPORT_FIELDS It is used for defining fields which needs to be exported. |
| 4 |
FEED_STORE_EMPTY It defines whether to export feeds with no items. |
| 5 |
FEED_STORAGES It is a dictionary with additional feed storage backends. |
| 6 |
FEED_STORAGES_BASE It is a dictionary with built-in feed storage backends. |
| 7 |
FEED_EXPORTERS It is a dictionary with additional feed exporters. |
| 8 |
FEED_EXPORTERS_BASE It is a dictionary with built-in feed exporters. |