us.codecraft.webmagic.model.annotation

注释类型 ExtractBy

@Retention(value=RUNTIME)
 @Target(value={FIELD,TYPE})
public @interface ExtractBy

Define the extractor for field or class.

从以下版本开始:

0.2.0

作者:

code4crafter@gmail.com

必需元素概要

所需元素

限定符和类型	必需的元素和说明
String	value Extractor expression, support XPath, CSS Selector and regex.

可选元素概要

可选元素

限定符和类型	可选元素和说明
boolean	multi 已过时。 since 0.4.2
boolean	notNull Define whether the field can be null.
ExtractBy.Source	source The source for extracting.
ExtractBy.Type	type Extractor type, support XPath, CSS Selector and regex.

元素详细资料

value

public abstract String value

Extractor expression, support XPath, CSS Selector and regex.

返回:

extractor expression

type

public abstract ExtractBy.Type type

Extractor type, support XPath, CSS Selector and regex.

返回:

extractor type

默认值:

us.codecraft.webmagic.model.annotation.ExtractBy.Type.XPath

notNull

public abstract boolean notNull

Define whether the field can be null.
If set to 'true' and the extractor get no result, the entire class will be discarded.

返回:

whether the field can be null

默认值:

false

source

public abstract ExtractBy.Source source

The source for extracting.
It works only if you already added 'ExtractBy' to Class.

返回:

the source for extracting

默认值:

us.codecraft.webmagic.model.annotation.ExtractBy.Source.SelectedHtml

multi

public abstract boolean multi

已过时。 since 0.4.2

Define whether the extractor return more than one result. When set to 'true', the extractor return a list of string (so you should define the field as List).
Deprecated since 0.4.2. This option is determined automatically by the class of field.

返回:

whether the extractor return more than one result

默认值:

false